/* ==========================================================================
   SACHIN SHARMA — Portfolio Design System
   A premium dark-themed portfolio for a civil/structural engineer.
   Mobile-first · Glassmorphism · Scroll-driven animations
   ========================================================================== */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500&family=Outfit:wght@500;600;700&display=swap');

/* ==========================================================================
   1. DESIGN TOKENS (Custom Properties)
   ========================================================================== */
:root {
  /* ── Accent: Warm Oxidized Steel ── */
  --steel:          hsl(15, 45%, 35%);
  --steel-light:    hsl(15, 50%, 45%);
  --steel-glow:     hsl(15, 60%, 50%);
  --steel-subtle:   hsla(15, 45%, 35%, 0.15);
  --steel-border:   hsla(15, 45%, 35%, 0.3);

  /* ── Surfaces ── */
  --charcoal:         hsl(220, 15%, 12%);
  --charcoal-light:   hsl(220, 12%, 16%);
  --charcoal-lighter: hsl(220, 10%, 22%);
  --surface-glass:    hsla(220, 15%, 15%, 0.7);
  --surface-glass-hover: hsla(220, 15%, 18%, 0.75);

  /* ── Text ── */
  --warm-white:  hsl(35, 30%, 93%);
  --warm-white-dim: hsl(35, 20%, 80%);
  --slate:       hsl(220, 10%, 55%);
  --slate-light: hsl(220, 10%, 65%);

  /* ── Typography ── */
  --font-heading: 'Outfit', system-ui, sans-serif;
  --font-body:    'Inter', system-ui, sans-serif;

  /* ── Spacing Scale ── */
  --space-xs:  0.5rem;
  --space-sm:  0.75rem;
  --space-md:  1rem;
  --space-lg:  1.5rem;
  --space-xl:  2.5rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  --space-4xl: 8rem;

  /* ── Layout ── */
  --max-width:    1200px;
  --nav-height:   72px;
  --border-radius: 16px;
  --border-radius-sm: 10px;
  --border-radius-pill: 100px;

  /* ── Transitions ── */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 200ms var(--ease-out-expo);
  --transition-base: 400ms var(--ease-out-expo);
  --transition-slow: 600ms var(--ease-out-expo);

  /* ── Shadows ── */
  --shadow-sm:  0 2px 8px hsla(0, 0%, 0%, 0.2);
  --shadow-md:  0 8px 32px hsla(0, 0%, 0%, 0.25);
  --shadow-lg:  0 16px 48px hsla(0, 0%, 0%, 0.35);
  --shadow-glow: 0 0 40px hsla(15, 60%, 50%, 0.15);
}

/* ==========================================================================
   2. RESET & BASE
   ========================================================================== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  -webkit-text-size-adjust: 100%;
  color-scheme: dark;
}

/* ==========================================================================
   TEXT SELECTION (PREMIUM & CLEAN BOUNDS)
   ========================================================================== */
/* Global fallback style */
::selection {
  background: rgba(176, 90, 58, 0.22); /* Translucent terracotta accent */
  color: inherit;
}
::-moz-selection {
  background: rgba(176, 90, 58, 0.22);
  color: inherit;
}

/* Neutralize selection highlights on block layout containers to prevent box-highlighting in Safari/Chrome */
div::selection,
section::selection,
article::selection,
header::selection,
footer::selection,
nav::selection,
ul::selection,
ol::selection,
main::selection {
  background: transparent;
}

/* Explicitly apply the selection highlight to text nodes and elements so it hugs text tightly */
p::selection,
span::selection,
a::selection,
li::selection,
h1::selection,
h2::selection,
h3::selection,
h4::selection,
h5::selection,
h6::selection,
strong::selection,
em::selection,
time::selection,
figcaption::selection,
code::selection,
pre::selection,
button::selection,
input::selection,
textarea::selection,
.education-degree::selection,
.education-field::selection,
.gallery-counter::selection,
.gallery-caption::selection,
.overlay-meta::selection,
.transit-dates::selection,
.transit-role::selection,
.transit-company::selection {
  background: rgba(176, 90, 58, 0.22) !important;
  color: inherit !important;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.7;
  color: var(--warm-white);
  background-color: var(--charcoal);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, video, model-viewer {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--steel-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--steel-glow);
}

:focus-visible {
  outline: 2px solid var(--steel-light);
  outline-offset: 3px;
  border-radius: 4px;
}



ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

/* ==========================================================================
   3. TYPOGRAPHY
   ========================================================================== */
:is(h1, h2, h3, h4) {
  font-family: var(--font-heading);
  line-height: 1.15;
  color: var(--warm-white);
  letter-spacing: -0.02em;
}

h1 {
  font-weight: 700;
  font-size: clamp(2.5rem, 5vw, 4.5rem);
}

h2 {
  font-weight: 600;
  font-size: clamp(1.8rem, 3vw, 2.8rem);
}

h3 {
  font-weight: 600;
  font-size: clamp(1.2rem, 2vw, 1.5rem);
}

h4 {
  font-weight: 500;
  font-size: 1.1rem;
}

.section-title {
  margin-block-end: var(--space-xl);
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 48px;
  height: 3px;
  background: var(--steel);
  border-radius: 2px;
}

.section-subtitle {
  color: var(--slate);
  font-size: 1.05rem;
  margin-block-start: var(--space-sm);
  max-width: 56ch;
}

/* ==========================================================================
   4. LAYOUT UTILITIES
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-lg);
}

section {
  padding-block: var(--space-3xl);
  position: relative;
}

section + section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: min(80%, 600px);
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--charcoal-lighter) 30%,
    var(--charcoal-lighter) 70%,
    transparent
  );
}

/* ==========================================================================
   5. NAVIGATION
   ========================================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  padding-inline: var(--space-lg);
  transition: background var(--transition-base),
              box-shadow var(--transition-base),
              backdrop-filter var(--transition-base);
}

.navbar.scrolled {
  background: var(--surface-glass);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  box-shadow: 0 1px 0 hsla(0, 0%, 100%, 0.04),
              var(--shadow-sm);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.nav-logo {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.4rem;
  color: var(--warm-white);
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.nav-logo .logo-accent {
  color: var(--steel-light);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav-links a {
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--slate-light);
  letter-spacing: 0.02em;
  position: relative;
  padding-block: var(--space-xs);
  transition: color var(--transition-fast);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--steel);
  border-radius: 1px;
  transition: width var(--transition-base);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--warm-white);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

/* ── Mobile Hamburger ── */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  height: 24px;
  justify-content: center;
  z-index: 1001;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--warm-white);
  border-radius: 1px;
  transition: transform var(--transition-base),
              opacity var(--transition-fast);
  transform-origin: center;
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: 0;
    width: min(320px, 85vw);
    height: 100dvh;
    flex-direction: column;
    justify-content: center;
    gap: var(--space-xl);
    background: var(--charcoal);
    padding: var(--space-2xl);
    transform: translateX(100%);
    transition: transform var(--transition-slow);
    box-shadow: -8px 0 32px hsla(0, 0%, 0%, 0.4);
    z-index: 1000;
  }

  .nav-links.open {
    transform: translateX(0);
  }

  .nav-links a {
    font-size: 1.1rem;
  }
}

/* ==========================================================================
   6. HERO
   ========================================================================== */
.hero {
  position: relative;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  padding-block-start: var(--nav-height);
}

/* Blueprint grid background */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    /* Fine grid */
    repeating-linear-gradient(
      0deg,
      hsla(15, 30%, 40%, 0.04) 0px,
      hsla(15, 30%, 40%, 0.04) 1px,
      transparent 1px,
      transparent 40px
    ),
    repeating-linear-gradient(
      90deg,
      hsla(15, 30%, 40%, 0.04) 0px,
      hsla(15, 30%, 40%, 0.04) 1px,
      transparent 1px,
      transparent 40px
    ),
    /* Major grid */
    repeating-linear-gradient(
      0deg,
      hsla(15, 30%, 40%, 0.07) 0px,
      hsla(15, 30%, 40%, 0.07) 1px,
      transparent 1px,
      transparent 200px
    ),
    repeating-linear-gradient(
      90deg,
      hsla(15, 30%, 40%, 0.07) 0px,
      hsla(15, 30%, 40%, 0.07) 1px,
      transparent 1px,
      transparent 200px
    );
  pointer-events: none;
  z-index: 0;
}

/* Radial glow behind hero text */
.hero::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, hsla(15, 50%, 40%, 0.08), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* ── Hero 3D Canvas ── */
#hero-3d-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: auto;
  opacity: 1;
}

html[data-theme="light"] #hero-3d-canvas {
  opacity: 1.0;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  padding-inline: var(--space-lg);
}

.hero-name {
  margin-block-end: var(--space-md);
  background: linear-gradient(
    135deg,
    var(--warm-white) 0%,
    var(--warm-white-dim) 50%,
    var(--steel-light) 100%
  );
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-tagline {
  font-family: var(--font-body);
  font-size: clamp(1rem, 2vw, 1.3rem);
  font-weight: 400;
  color: var(--slate-light);
  letter-spacing: 0.06em;
  margin-block-end: var(--space-2xl);
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-xl);
  border: 1px solid var(--steel-border);
  border-radius: var(--border-radius-pill);
  color: var(--warm-white);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  transition: all var(--transition-base);
  background: var(--steel-subtle);
}

.hero-cta:hover {
  background: var(--steel);
  border-color: var(--steel);
  color: var(--warm-white);
  box-shadow: var(--shadow-glow);
}

/* Scroll indicator */
.scroll-indicator {
  position: absolute;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  color: var(--slate);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  z-index: 2;
}

.scroll-indicator::after {
  content: '';
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--steel-light), transparent);
  animation: scroll-pulse 2s ease-in-out infinite;
}

@keyframes scroll-pulse {
  0%, 100% { opacity: 0.3; transform: scaleY(0.6); }
  50%      { opacity: 1;   transform: scaleY(1); }
}

/* ==========================================================================
   7. GLASSMORPHISM CARDS
   ========================================================================== */
.glass-card {
  background: var(--surface-glass);
  backdrop-filter: blur(20px) saturate(1.3);
  -webkit-backdrop-filter: blur(20px) saturate(1.3);
  border: 1px solid hsla(0, 0%, 100%, 0.06);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  transition: transform var(--transition-base),
              box-shadow var(--transition-base),
              border-color var(--transition-base),
              background var(--transition-base);
}

.glass-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  border-color: var(--steel-border);
  background: var(--surface-glass-hover);
}

/* ==========================================================================
   8. ABOUT SECTION
   ========================================================================== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
  align-items: start;
}

@media (min-width: 900px) {
  .about-grid {
    grid-template-columns: 1.2fr 1.8fr;
    gap: var(--space-2xl);
  }
}

/* --- Arup-style Profile Card --- */
.about-profile-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  width: 100%;
}

.about-profile-img-wrap {
  width: 100%;
  aspect-ratio: 3 / 4;
  border-radius: var(--border-radius);
  overflow: hidden;
  position: relative;
  background: var(--charcoal-light);
  border: 1px solid var(--steel-border);
}

.about-profile-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

/* Zoom in the image slightly on hover for extra depth */
.about-profile-card:hover .about-profile-img-wrap img,
.about-profile-card:focus-within .about-profile-img-wrap img {
  transform: scale(1.03);
}

.about-profile-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 3.5rem;
  font-weight: 700;
  color: var(--steel-light);
  background: radial-gradient(circle at center, var(--charcoal-light), var(--charcoal));
  letter-spacing: -0.05em;
}

.about-profile-name {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 3.5vw, 2.2rem);
  font-weight: 600;
  color: var(--warm-white);
  margin-top: var(--space-md);
  margin-bottom: 2px;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.about-profile-role {
  font-size: 1.05rem;
  font-weight: 400;
  color: var(--steel-light);
  margin-bottom: var(--space-md);
}

.about-profile-bio-wrapper {
  width: 100%;
  margin-top: var(--space-xs);
}

.about-profile-bio {
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--warm-white-dim);
}

.about-content-col {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.about-details {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.detail-card {
  background: var(--surface-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid hsla(0, 0%, 100%, 0.05);
  border-radius: var(--border-radius-sm);
  padding: var(--space-lg);
}

.detail-card h4 {
  color: var(--steel-light);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-block-end: var(--space-md);
}

.education-item {
  padding-block: var(--space-sm);
  border-bottom: 1px solid hsla(0, 0%, 100%, 0.04);
}

.education-item:last-child {
  border-bottom: none;
}

.education-degree {
  font-weight: 500;
  color: var(--warm-white);
  font-size: 0.95rem;
}

.education-field {
  color: var(--slate);
  font-size: 0.85rem;
}

.current-role-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-md);
  background: var(--steel-subtle);
  border: 1px solid var(--steel-border);
  border-radius: var(--border-radius-pill);
  color: var(--steel-light);
  font-size: 0.85rem;
  font-weight: 500;
}

.current-role-badge::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--steel-glow);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 0.5; transform: scale(0.8); }
  50%      { opacity: 1;   transform: scale(1.2); }
}

/* ==========================================================================
   8b. EXPERIENCE BENTO BOX
   ========================================================================== */
.about-experience {
  min-width: 0;
}

.experience-bento {
  padding-top: var(--space-xl);
}

.bento-title {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: var(--warm-white);
  margin-bottom: var(--space-xl);
}

.bento-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-md);
  perspective: 1000px;
}

.bento-card {
  position: relative;
  background: var(--surface-glass);
  border: 1px solid var(--steel-border);
  border-radius: 20px;
  padding: var(--space-lg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
  transition: transform 0.1s ease-out, box-shadow 0.3s ease, border-color 0.3s ease;
  will-change: transform;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 160px;
}

.bento-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(255,255,255,0.05) 0%, transparent 100%);
  z-index: 0;
  pointer-events: none;
}

.bento-card-primary {
  grid-column: 1 / -1; /* Span full width for the primary/longest role */
  background: linear-gradient(145deg, var(--surface-glass) 0%, rgba(30,40,50,0.8) 100%);
  border-color: rgba(255,100,50,0.2); /* Subtle accent border */
}

.bento-card:hover {
  border-color: var(--steel-light);
  box-shadow: 0 15px 40px rgba(0,0,0,0.4), 0 0 20px rgba(255,255,255,0.05);
}

.bento-content {
  position: relative;
  z-index: 1;
}

.bento-dates {
  font-size: 0.75rem;
  color: var(--steel-light);
  margin-bottom: 8px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.bento-role {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--warm-white);
  margin-bottom: 4px;
}

.bento-company {
  font-size: 0.85rem;
  color: var(--warm-white-dim);
  font-style: italic;
  margin-bottom: 12px;
}

.concurrent-badge {
  display: inline-block;
  padding: 4px 10px;
  background: rgba(255, 100, 50, 0.1);
  border: 1px solid rgba(255, 100, 50, 0.3);
  color: #ffbba3;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--border-radius-pill);
  box-shadow: 0 0 10px rgba(255, 100, 50, 0.2);
  margin-top: 8px;
}

/* ==========================================================================
   9. PROJECTS SECTION
   ========================================================================== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-xl);
}

.project-card {
  cursor: pointer;
  overflow: hidden;
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.project-card-image {
  position: relative;
  height: 200px;
  background: linear-gradient(
    135deg,
    var(--charcoal-light) 0%,
    var(--charcoal-lighter) 100%
  );
  border-radius: var(--border-radius) var(--border-radius) 0 0;
  overflow: hidden;
  margin: calc(-1 * var(--space-xl));
  margin-block-end: var(--space-lg);
}

/* Structural pattern for project cards */
.project-card-image::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(
      45deg,
      hsla(15, 30%, 40%, 0.06) 0px,
      hsla(15, 30%, 40%, 0.06) 1px,
      transparent 1px,
      transparent 20px
    ),
    repeating-linear-gradient(
      -45deg,
      hsla(15, 30%, 40%, 0.06) 0px,
      hsla(15, 30%, 40%, 0.06) 1px,
      transparent 1px,
      transparent 20px
    );
}

.project-card-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    transparent 50%,
    var(--surface-glass) 100%
  );
}

.project-badge {
  position: absolute;
  top: var(--space-md);
  left: var(--space-md);
  z-index: 2;
  padding: 4px 12px;
  background: var(--steel);
  color: var(--warm-white);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-radius: var(--border-radius-pill);
}

.project-year {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  z-index: 2;
  color: var(--slate);
  font-size: 0.8rem;
  font-weight: 500;
  font-family: var(--font-heading);
}

.project-card h3 {
  margin-block-end: var(--space-sm);
}

.project-card p {
  color: var(--slate-light);
  font-size: 0.9rem;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-block-end: var(--space-md);
}

.project-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-block-start: auto;
  padding-block-start: var(--space-md);
  border-top: 1px solid hsla(0, 0%, 100%, 0.04);
}

.project-role {
  color: var(--steel-light);
  font-size: 0.8rem;
  font-weight: 500;
}

.project-view-btn {
  font-size: 0.8rem;
  color: var(--slate);
  display: flex;
  align-items: center;
  gap: 4px;
  transition: color var(--transition-fast);
}

.project-card:hover .project-view-btn {
  color: var(--steel-light);
}

.project-view-btn::after {
  content: '→';
  transition: transform var(--transition-fast);
}

.project-card:hover .project-view-btn::after {
  transform: translateX(4px);
}

/* ==========================================================================
   10. PROJECT DETAIL OVERLAY
   ========================================================================== */
.project-overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: hsla(220, 15%, 8%, 0.85);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  display: flex;
  align-items: flex-start; /* Clean top-start alignment for long content scrolling */
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base),
              visibility var(--transition-base);
  overflow-y: auto;
  padding: 5vh var(--space-xl); /* Balanced margin from top/bottom */
  /* Custom scrollbar styling */
  scrollbar-width: thin;
  scrollbar-color: var(--steel-border) rgba(0, 0, 0, 0.05);
}

.project-overlay::-webkit-scrollbar {
  width: 6px;
}
.project-overlay::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.05);
}
.project-overlay::-webkit-scrollbar-thumb {
  background: var(--steel-border);
  border-radius: 3px;
}
.project-overlay::-webkit-scrollbar-thumb:hover {
  background: var(--steel-glow);
}

.project-overlay.active {
  opacity: 1;
  visibility: visible;
}

.project-overlay-content {
  width: 100%;
  max-width: 1000px; /* Expanded for split layout */
  background: var(--charcoal-light);
  border: 1px solid hsla(0, 0%, 100%, 0.06);
  border-radius: var(--border-radius);
  padding: var(--space-xl); /* Reduced padding for better layout density */
  position: relative;
  transform: translateY(40px) scale(0.96);
  transition: transform var(--transition-slow);
  overflow: visible; /* Let container expand naturally */
}

/* ── Overlay Split Columns Layout ── */
.overlay-split-container {
  display: grid;
  grid-template-columns: 1fr 1.1fr; /* Better balanced ratios to prevent tall squished text columns */
  gap: var(--space-xl);
  overflow: visible;
  align-items: start; /* Don't stretch items vertically, allow sticky to slide */
}

.overlay-left-col {
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 80px; /* Pin the gallery 80px from the top of the viewport */
  align-self: start;
  width: 100%;
}

.overlay-left-col .overlay-gallery {
  margin-block-end: 0;
  width: 100%;
}

.overlay-left-col .gallery-viewport {
  width: 100%;
  aspect-ratio: 1.25;
  border-radius: var(--border-radius-sm);
}

.overlay-left-col .gallery-track {
  width: 100%;
  height: 100%;
  aspect-ratio: auto;
}

.overlay-right-col {
  display: flex;
  flex-direction: column;
  overflow: visible;
  border-left: 1px solid hsla(0, 0%, 100%, 0.06);
  padding-inline-start: var(--space-xl);
}

html[data-theme="light"] .overlay-right-col {
  border-left-color: var(--charcoal-lighter);
}

.overlay-scroll-body {
  overflow-y: visible; /* Expand description naturally */
  padding-inline-end: 0;
}

.overlay-single-container {
  overflow: visible;
  max-height: none;
}

.project-overlay.active .project-overlay-content {
  transform: translateY(0) scale(1);
}

.overlay-close {
  position: absolute;
  top: var(--space-lg);
  right: var(--space-lg);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: hsla(0, 0%, 100%, 0.05);
  color: var(--slate);
  font-size: 1.3rem;
  transition: all var(--transition-fast);
  z-index: 1;
}

.overlay-close:hover {
  background: hsla(0, 0%, 100%, 0.1);
  color: var(--warm-white);
}

.overlay-header {
  margin-block-end: var(--space-xl);
  padding-block-end: var(--space-lg);
  border-bottom: 1px solid hsla(0, 0%, 100%, 0.06);
}

.overlay-meta {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-block-start: var(--space-md);
}

.overlay-meta span {
  font-size: 0.8rem;
  color: var(--slate);
  padding: 3px 10px;
  background: hsla(0, 0%, 100%, 0.04);
  border-radius: var(--border-radius-pill);
}

.overlay-section {
  margin-block-end: var(--space-xl);
}

.overlay-section h4 {
  color: var(--steel-light);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-block-end: var(--space-sm);
}

.overlay-section p {
  color: var(--warm-white-dim);
  font-size: 0.95rem;
  line-height: 1.8;
}

/* ── Story Section ── */
.overlay-story {
  background: var(--steel-subtle);
  border: 1px solid var(--steel-border);
  border-radius: var(--border-radius-sm);
  padding: var(--space-xl);
}

.overlay-story h4 {
  color: var(--steel-glow);
}

.overlay-story p {
  font-style: italic;
  line-height: 1.9;
}

/* ── Project Card Hero Image ── */
.project-hero-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  z-index: 1;
  transition: transform var(--transition-slow);
}

.project-card:hover .project-hero-img {
  transform: scale(1.05);
}

.project-card.has-hero-image .project-card-image::before {
  z-index: 2;
}

.project-card.has-hero-image .project-card-image::after {
  z-index: 3;
  background: linear-gradient(
    to bottom,
    transparent 20%,
    hsla(220, 15%, 12%, 0.6) 80%,
    hsla(220, 15%, 12%, 0.95) 100%
  );
}

/* ── Overlay Image Gallery ── */
.overlay-gallery {
  margin-block-end: var(--space-xl);
}

.gallery-viewport {
  position: relative;
  width: 100%;
  border-radius: var(--border-radius-sm);
  overflow: hidden;
  background: var(--charcoal);
}

.gallery-track {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
}

.gallery-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 500ms ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.gallery-slide.active {
  opacity: 1;
  z-index: 2;
}

.gallery-slide img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  cursor: zoom-in;
}

.gallery-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-lg) var(--space-lg) var(--space-md);
  background: linear-gradient(to top, hsla(220, 15%, 8%, 0.85), transparent);
  color: var(--warm-white-dim);
  font-size: 0.82rem;
  line-height: 1.5;
  z-index: 3;
}

/* ── Gallery Navigation Arrows ── */
.gallery-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: hsla(220, 15%, 12%, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid hsla(0, 0%, 100%, 0.1);
  color: var(--warm-white);
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  opacity: 0;
}

.gallery-viewport:hover .gallery-nav {
  opacity: 1;
}

.gallery-prev { left: var(--space-md); }
.gallery-next { right: var(--space-md); }

.gallery-nav:hover {
  background: var(--steel);
  border-color: var(--steel);
  transform: translateY(-50%) scale(1.1);
  box-shadow: var(--shadow-glow);
}

/* ── Gallery Dots ── */
.gallery-dots {
  position: absolute;
  bottom: var(--space-md);
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  gap: 8px;
}

.gallery-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: hsla(0, 0%, 100%, 0.3);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  padding: 0;
}

.gallery-dot.active {
  background: var(--steel-light);
  transform: scale(1.3);
  box-shadow: 0 0 8px hsla(15, 60%, 50%, 0.4);
}

.gallery-dot:hover:not(.active) {
  background: hsla(0, 0%, 100%, 0.6);
}

/* ── Gallery Counter ── */
.gallery-counter {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  z-index: 10;
  padding: 4px 12px;
  background: hsla(220, 15%, 12%, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: var(--border-radius-pill);
  color: var(--slate-light);
  font-size: 0.75rem;
  font-weight: 500;
  font-family: var(--font-heading);
}

/* ==========================================================================
   11. RESEARCH / MODEL VIEWER SECTION
   ========================================================================== */
.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--space-xl);
}

.model-card {
  overflow: hidden;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.model-viewer-container {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  border-radius: var(--border-radius-sm);
  overflow: hidden;
  background: var(--charcoal);
  margin-block-end: var(--space-lg);
}

.model-viewer-container model-viewer {
  width: 100%;
  height: 100%;
  --poster-color: transparent;
}

.model-poster-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  background: linear-gradient(
    135deg,
    hsla(220, 15%, 12%, 0.9),
    hsla(220, 15%, 16%, 0.9)
  );
  cursor: pointer;
  transition: opacity var(--transition-base);
  z-index: 5;
}

.model-poster-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.model-poster-overlay .play-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  border: 2px solid var(--steel-border);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
  background: var(--steel-subtle);
}

.model-poster-overlay:hover .play-icon {
  background: var(--steel);
  border-color: var(--steel);
  transform: scale(1.1);
  box-shadow: var(--shadow-glow);
}

.model-poster-overlay .play-icon::after {
  content: '';
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent var(--warm-white);
  margin-left: 3px;
}

.model-poster-text {
  color: var(--slate);
  font-size: 0.85rem;
  font-weight: 500;
}

.model-loading-spinner {
  position: absolute;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 4;
  background: hsla(220, 15%, 12%, 0.7);
}

.model-loading-spinner.visible {
  display: flex;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid hsla(0, 0%, 100%, 0.1);
  border-top-color: var(--steel-light);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.model-card h3 {
  margin-block-end: var(--space-xs);
}

.model-card p {
  color: var(--slate-light);
  font-size: 0.9rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-block-end: var(--space-md);
}

.model-card-footer {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  margin-block-start: auto;
  padding-block-start: var(--space-md);
  border-top: 1px solid hsla(0, 0%, 100%, 0.04);
}

.model-view-btn {
  font-size: 0.8rem;
  color: var(--slate);
  display: flex;
  align-items: center;
  gap: 4px;
  transition: color var(--transition-fast);
}

.model-card:hover .model-view-btn {
  color: var(--steel-light);
}

.model-view-btn::after {
  content: '→';
  transition: transform var(--transition-fast);
}

.model-card:hover .model-view-btn::after {
  transform: translateX(4px);
}

/* ==========================================================================
   12. OTHER WORKS SECTION
   ========================================================================== */
.other-works-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-xl);
}

.work-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  padding: var(--space-xl);
  position: relative;
  cursor: pointer;
}

.work-card-image {
  position: relative;
  height: 200px;
  background: linear-gradient(
    135deg,
    var(--charcoal-light) 0%,
    var(--charcoal-lighter) 100%
  );
  border-radius: var(--border-radius) var(--border-radius) 0 0;
  overflow: hidden;
  margin: calc(-1 * var(--space-xl));
  margin-block-end: var(--space-lg);
}

.work-card-image::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(
      45deg,
      hsla(15, 30%, 40%, 0.06) 0px,
      hsla(15, 30%, 40%, 0.06) 1px,
      transparent 1px,
      transparent 20px
    ),
    repeating-linear-gradient(
      -45deg,
      hsla(15, 30%, 40%, 0.06) 0px,
      hsla(15, 30%, 40%, 0.06) 1px,
      transparent 1px,
      transparent 20px
    );
}

.work-card-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    transparent 50%,
    var(--surface-glass) 100%
  );
}

.work-hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  position: relative;
  z-index: 1;
  transition: transform var(--transition-slow);
}

.work-card:hover .work-hero-img {
  transform: scale(1.05);
}

.work-badge {
  position: absolute;
  top: var(--space-md);
  left: var(--space-md);
  z-index: 2;
  padding: 4px 12px;
  background: var(--surface-glass);
  border: 1px solid var(--steel-border);
  border-radius: var(--border-radius-pill);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--steel-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  backdrop-filter: blur(8px);
}

.work-card-image .work-year {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  z-index: 2;
  padding: 4px 10px;
  background: hsla(0, 0%, 0%, 0.4);
  border-radius: var(--border-radius-sm);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--warm-white);
}

.work-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: 4px;
}

.work-description {
  font-size: 0.95rem;
  color: var(--warm-white-dim);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-block-end: var(--space-md);
}

.work-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: var(--space-md);
  border-top: 1px solid var(--charcoal-lighter);
}

.work-link {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--steel-light);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: color var(--transition-fast);
}

.work-link:hover {
  color: var(--steel-glow);
}

.work-view-btn {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--steel-light);
  transition: color var(--transition-fast);
}

.work-card:hover .work-view-btn {
  color: var(--steel-glow);
}

/* ==========================================================================
   12b. CONFERENCES & PAPERS SECTION
   ========================================================================== */
.publications-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-xl);
}

.publication-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  padding: var(--space-xl);
  position: relative;
  overflow: hidden;
  height: 100%;
}

.publication-card.has-hero-image {
  cursor: pointer;
}

.publication-card-image {
  position: relative;
  height: 160px;
  background: linear-gradient(
    135deg,
    var(--charcoal-light) 0%,
    var(--charcoal-lighter) 100%
  );
  border-radius: var(--border-radius) var(--border-radius) 0 0;
  overflow: hidden;
  margin: calc(-1 * var(--space-xl));
  margin-block-end: var(--space-md);
  width: calc(100% + var(--space-xl) * 2);
  flex-shrink: 0;
}

.publication-card-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    transparent 50%,
    var(--surface-glass) 100%
  );
}

.publication-hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 25%;
  position: relative;
  z-index: 1;
  transition: transform var(--transition-slow);
}

.publication-card.has-hero-image:hover .publication-hero-img {
  transform: scale(1.05);
}

.publication-card.has-hero-image:hover {
  border-color: var(--accent);
  box-shadow: 0 8px 32px var(--shadow-strong);
  transform: translateY(-4px);
}

.publication-year {
  align-self: flex-start;
  padding: 4px 12px;
  background: var(--steel-subtle);
  border: 1px solid var(--steel-border);
  border-radius: var(--border-radius-pill);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--steel-light);
}

.publication-badge {
  align-self: flex-start;
  padding: 4px 12px;
  background: var(--charcoal-lighter);
  border: 1px solid var(--charcoal-lighter);
  border-radius: var(--border-radius-pill);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--warm-white-dim);
}

.publication-card.has-hero-image .publication-badges {
  position: absolute;
  top: var(--space-md);
  left: var(--space-md);
  z-index: 2;
  margin: 0;
  display: flex;
  gap: 8px;
}

.publication-card.has-hero-image .publication-year {
  margin: 0;
  background: var(--steel);
  color: var(--warm-white);
  border: none;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  backdrop-filter: blur(8px);
}

.publication-card.has-hero-image .publication-badge {
  margin: 0;
  background: var(--charcoal-light);
  color: var(--warm-white);
  border: 1px solid hsla(0, 0%, 100%, 0.1);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  backdrop-filter: blur(8px);
}

.publication-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-top: 4px;
}

.publication-authors {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--warm-white-dim);
}

.publication-venue {
  font-size: 0.88rem;
  font-style: italic;
  color: var(--slate-light);
}

.publication-abstract {
  font-size: 0.9rem;
  color: var(--slate);
  margin-top: 6px;
  line-height: 1.6;
}

.publication-link {
  align-self: flex-start;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--steel-light);
}

.publication-card-footer {
  margin-top: auto;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  padding-top: var(--space-md);
}

.publication-view-btn {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: color var(--transition);
}

.publication-card.has-hero-image:hover .publication-view-btn {
  color: var(--accent-light);
}

.publication-link:hover {
  color: var(--steel-glow);
}


/* ==========================================================================
   13. CONTACT SECTION
   ========================================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
}

@media (min-width: 768px) {
  .contact-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.contact-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.contact-icon {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  border-radius: var(--border-radius-sm);
  background: var(--steel-subtle);
  border: 1px solid var(--steel-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--steel-light);
  font-size: 1.2rem;
}

.contact-item-label {
  font-size: 0.8rem;
  color: var(--slate);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.contact-item-value {
  color: var(--warm-white);
  font-weight: 500;
}

.contact-item-value a {
  color: var(--warm-white);
}

.contact-item-value a:hover {
  color: var(--steel-light);
}

/* Contact Form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.form-group {
  position: relative;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  background: var(--surface-glass);
  border: 1px solid hsla(0, 0%, 100%, 0.06);
  border-radius: var(--border-radius-sm);
  color: var(--warm-white);
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: border-color var(--transition-fast),
              box-shadow var(--transition-fast);
  outline: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--slate);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--steel-light);
  box-shadow: 0 0 0 3px hsla(15, 45%, 35%, 0.15);
}

.form-group textarea {
  min-height: 140px;
  resize: vertical;
}

.form-submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-2xl);
  background: var(--steel);
  color: var(--warm-white);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-base);
  align-self: flex-start;
}

.form-submit:hover {
  background: var(--steel-light);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

/* Form Validation & Feedback states */
.form-group.has-error input,
.form-group.has-error textarea {
  border-color: #e55353 !important;
  box-shadow: 0 0 0 3px rgba(229, 83, 83, 0.15) !important;
}

.form-error-msg {
  color: #e55353;
  font-size: 0.78rem;
  font-weight: 500;
  margin-top: 6px;
  display: block;
  animation: field-fade-in 0.25s ease-out forwards;
}

.spinner-inline {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: #fff;
  animation: spin 0.8s linear infinite;
  display: inline-block;
  vertical-align: middle;
}

.contact-success-card {
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  animation: field-fade-in 0.4s ease-out forwards;
}

.contact-success-card .success-icon {
  width: 56px;
  height: 56px;
  background: rgba(46, 204, 113, 0.15);
  border: 2px solid #2ecc71;
  color: #2ecc71;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  font-weight: bold;
  box-shadow: 0 0 20px rgba(46, 204, 113, 0.25);
  margin-bottom: var(--space-xs);
}

.contact-success-card h3 {
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--warm-white);
  margin: 0;
}

.contact-success-card p {
  color: var(--warm-white-dim);
  font-size: 0.95rem;
  line-height: 1.6;
  max-width: 320px;
  margin: 0;
}

.btn-reset-form {
  margin-top: var(--space-md);
  padding: 10px 24px;
  background: var(--surface-glass);
  border: 1px solid var(--steel-border);
  color: var(--warm-white);
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: all var(--transition-base);
}

.btn-reset-form:hover {
  background: var(--steel-subtle);
  border-color: var(--steel-light);
  transform: translateY(-1px);
}

@keyframes field-fade-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==========================================================================
   14. FOOTER
   ========================================================================== */
.site-footer {
  padding-block: var(--space-2xl);
  text-align: center;
  border-top: 1px solid hsla(0, 0%, 100%, 0.04);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.footer-copyright {
  color: var(--slate);
  font-size: 0.85rem;
}

.footer-admin-link {
  color: var(--charcoal-lighter);
  font-size: 0.7rem;
  transition: color var(--transition-fast);
}

.footer-admin-link:hover {
  color: var(--slate);
}

/* ==========================================================================
   15. SCROLL-DRIVEN ENTRY ANIMATIONS
   ========================================================================== */

/* ── Keyframes ── */
@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* ── CSS Scroll-Driven (Modern Browsers) ── */
@supports (animation-timeline: view()) {
  .animate-on-scroll {
    animation: fade-up linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 30%;
  }
}

/* ── JS Intersection Observer Fallback ── */
@supports not (animation-timeline: view()) {
  .animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--transition-slow),
                transform var(--transition-slow);
  }

  .animate-on-scroll.in-view {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Stagger children */
.animate-on-scroll:nth-child(2) { transition-delay: 80ms; }
.animate-on-scroll:nth-child(3) { transition-delay: 160ms; }
.animate-on-scroll:nth-child(4) { transition-delay: 240ms; }
.animate-on-scroll:nth-child(5) { transition-delay: 320ms; }
.animate-on-scroll:nth-child(6) { transition-delay: 400ms; }

/* ==========================================================================
   16. REDUCED MOTION
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .animate-on-scroll {
    opacity: 1 !important;
    transform: none !important;
  }

  .scroll-indicator::after {
    animation: none;
  }
}

/* ==========================================================================
   17. RESPONSIVE REFINEMENTS
   ========================================================================== */
@media (max-width: 480px) {
  :root {
    --space-xl: 1.5rem;
    --space-2xl: 2.5rem;
    --space-3xl: 3.5rem;
  }

  .container {
    padding-inline: var(--space-md);
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .other-works-grid {
    grid-template-columns: 1fr;
  }

  .publications-grid {
    grid-template-columns: 1fr;
  }

  .project-overlay-content {
    padding: var(--space-lg);
  }

  .hero-name {
    font-size: clamp(2rem, 8vw, 3rem);
  }
}

@media (min-width: 1024px) {
  section {
    padding-block: var(--space-4xl);
  }
}

/* ==========================================================================
   18. UTILITY CLASSES
   ========================================================================== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.text-accent { color: var(--steel-light); }
.text-muted  { color: var(--slate); }

/* Mobile nav overlay background */
.nav-overlay {
  position: fixed;
  inset: 0;
  background: hsla(0, 0%, 0%, 0.5);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base),
              visibility var(--transition-base);
}

.nav-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* ==========================================================================
   19. LIGHT THEME OVERRIDES
   ========================================================================== */
html[data-theme="light"] {
  /* Surfaces */
  --charcoal:         hsl(220, 20%, 97%);        /* Page body background */
  --charcoal-light:   hsl(220, 15%, 93%);        /* Card background */
  --charcoal-lighter: hsl(220, 12%, 86%);        /* Borders and separators */
  --surface-glass:    rgba(255, 255, 255, 0.7);  /* Glass surfaces */
  --surface-glass-hover: rgba(255, 255, 255, 0.85);

  /* Text */
  --warm-white:       hsl(220, 25%, 12%);        /* Main text */
  --warm-white-dim:   hsl(220, 15%, 25%);        /* Secondary text */
  --slate:            hsl(220, 12%, 40%);        /* Muted text */
  --slate-light:      hsl(220, 10%, 48%);        /* Lighter muted */

  /* Override dark box-shadows with soft light-mode shadows */
  --shadow-sm:  0 2px 8px hsla(220, 15%, 10%, 0.06);
  --shadow-md:  0 8px 32px hsla(220, 15%, 10%, 0.1);
  --shadow-lg:  0 16px 48px hsla(220, 15%, 10%, 0.14);
  --shadow-glow: 0 0 40px hsla(15, 60%, 50%, 0.06);

  color-scheme: light;
}

/* Specific component overrides for light theme */
html[data-theme="light"] .glass-card {
  border: 1px solid var(--charcoal-lighter);
}
html[data-theme="light"] .navbar.scrolled {
  box-shadow: 0 1px 0 var(--charcoal-lighter), var(--shadow-sm);
}
html[data-theme="light"] .form-group input,
html[data-theme="light"] .form-group textarea {
  background: var(--charcoal-light);
  border: 1px solid var(--charcoal-lighter);
  color: var(--warm-white);
}
html[data-theme="light"] .project-card-image {
  border: 1px solid var(--charcoal-lighter);
}
html[data-theme="light"] .work-card-image {
  border: 1px solid var(--charcoal-lighter);
}
html[data-theme="light"] .education-item {
  border-bottom: 1px solid var(--charcoal-lighter);
}
html[data-theme="light"] .detail-card {
  border: 1px solid var(--charcoal-lighter);
}
html[data-theme="light"] .gallery-viewport {
  background: var(--charcoal-light);
  border: 1px solid var(--charcoal-lighter);
}
html[data-theme="light"] .gallery-slide {
  background: var(--charcoal-light);
}
html[data-theme="light"] .overlay-close {
  background: rgba(0, 0, 0, 0.05);
  color: var(--warm-white-dim);
}
html[data-theme="light"] .overlay-close:hover {
  background: rgba(0, 0, 0, 0.1);
  color: var(--warm-white);
}
html[data-theme="light"] .project-overlay {
  background: rgba(240, 242, 245, 0.85);
}
html[data-theme="light"] .project-overlay-content {
  border-color: var(--charcoal-lighter);
}
html[data-theme="light"] .overlay-header {
  border-bottom-color: var(--charcoal-lighter);
}
html[data-theme="light"] .overlay-meta span {
  background: rgba(0, 0, 0, 0.04);
}

/* Document Lightbox / Zoom Window Light Theme */
html[data-theme="light"] .document-lightbox {
  background: rgba(245, 246, 248, 0.95);
}
html[data-theme="light"] .lightbox-close {
  background: rgba(0, 0, 0, 0.05);
  border-color: var(--charcoal-lighter);
  color: var(--warm-white-dim);
}
html[data-theme="light"] .lightbox-close:hover {
  background: var(--steel-glow);
  border-color: var(--steel-glow);
  color: #fff;
}
html[data-theme="light"] .lightbox-toolbar {
  background: rgba(255, 255, 255, 0.85);
  border-color: var(--charcoal-lighter);
  box-shadow: var(--shadow-lg);
}
html[data-theme="light"] .lightbox-toolbar:hover {
  background: rgba(255, 255, 255, 0.98);
  border-color: var(--charcoal-lighter);
}
html[data-theme="light"] .lightbox-btn {
  color: var(--warm-white-dim);
}
html[data-theme="light"] .lightbox-btn:hover {
  background: var(--charcoal-light);
  color: var(--steel-glow);
}
html[data-theme="light"] .lightbox-zoom-level {
  color: var(--warm-white);
}
html[data-theme="light"] .lightbox-divider {
  background: var(--charcoal-lighter);
}

/* 3D Model Overlay & Poster Light Theme */
html[data-theme="light"] .model-overlay {
  background: rgba(245, 246, 248, 0.9);
}
html[data-theme="light"] .model-overlay-viewer-wrapper {
  background: radial-gradient(circle at 50% 50%, rgba(0, 0, 0, 0.05) 0%, transparent 80%);
}
html[data-theme="light"] .model-poster-overlay {
  background: linear-gradient(
    135deg,
    rgba(240, 242, 245, 0.9),
    rgba(255, 255, 255, 0.9)
  );
}
html[data-theme="light"] .site-footer {
  border-top: 1px solid var(--charcoal-lighter);
}
html[data-theme="light"] .hero::before {
  /* blue architectural grid on light blueprint paper */
  background:
    /* Fine grid */
    repeating-linear-gradient(
      0deg,
      hsla(215, 25%, 55%, 0.06) 0px,
      hsla(215, 25%, 55%, 0.06) 1px,
      transparent 1px,
      transparent 40px
    ),
    repeating-linear-gradient(
      90deg,
      hsla(215, 25%, 55%, 0.06) 0px,
      hsla(215, 25%, 55%, 0.06) 1px,
      transparent 1px,
      transparent 40px
    ),
    /* Major grid */
    repeating-linear-gradient(
      0deg,
      hsla(215, 30%, 45%, 0.12) 0px,
      hsla(215, 30%, 45%, 0.12) 1px,
      transparent 1px,
      transparent 200px
    ),
    repeating-linear-gradient(
      90deg,
      hsla(215, 30%, 45%, 0.12) 0px,
      hsla(215, 30%, 45%, 0.12) 1px,
      transparent 1px,
      transparent 200px
    );
}

html[data-theme="light"] .hero::after {
  background: radial-gradient(circle, hsla(215, 50%, 45%, 0.08), transparent 70%);
}

/* ── TAB LAYOUT ROUTING ── */
section {
  display: none !important;
}

section.active-tab {
  display: block !important;
  animation: tab-fade-in 450ms var(--ease-out-expo) forwards;
}

section.active-tab:not(.hero) {
  padding-block-start: calc(var(--nav-height) + var(--space-xl));
}

section.hero.active-tab {
  display: flex !important;
}

/* Force all scroll animation targets to be visible in active tab */
section.active-tab .animate-on-scroll {
  opacity: 1 !important;
  transform: none !important;
  animation: none !important;
}

@keyframes tab-fade-in {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Hide scroll indicator since single section tabs do not scroll infinitely */
section.active-tab .scroll-indicator {
  display: none !important;
}

/* ── THEME TOGGLE BUTTON ── */
.theme-toggle-btn {
  background: var(--surface-glass);
  border: 1px solid var(--steel-border);
  color: var(--text);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.15rem;
  transition: all var(--transition-fast);
  margin-inline-start: var(--space-md);
  padding: 0;
  z-index: 100;
}

.theme-toggle-btn:hover {
  background: var(--steel-glow);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--accent-subtle);
  border-color: var(--accent-glow);
}

.theme-toggle-btn:active {
  transform: translateY(0);
}

/* Position toggle next to hamburger icon on mobile */
@media (max-width: 768px) {
  .theme-toggle-btn {
    margin-inline-start: auto;
    margin-inline-end: var(--space-md);
  }
}

/* Responsive split overlay styling for mobile */
@media (max-width: 768px) {
  .project-overlay-content {
    max-height: none;
    overflow: visible;
    padding: var(--space-xl);
  }
  .overlay-split-container {
    grid-template-columns: 1fr;
    height: auto;
    overflow: visible;
  }
  .overlay-left-col {
    position: static;
  }
  .gallery-nav {
    opacity: 1;
  }
  .overlay-right-col {
    border-left: none;
    padding-inline-start: 0;
    height: auto;
    overflow: visible;
  }
  .overlay-scroll-body {
    overflow-y: visible;
    height: auto;
  }
}

/* ── 3D MODEL FULLSCREEN OVERLAY ── */
.model-overlay {
  position: fixed;
  inset: 0;
  z-index: 2100; /* Higher than project overlay (2000) */
  background: hsla(220, 15%, 8%, 0.90);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
  padding: var(--space-md);
}

.model-overlay.active {
  opacity: 1;
  visibility: visible;
}

.model-overlay-content {
  width: 92vw;
  height: 88vh;
  max-width: 1200px;
  max-height: 800px;
  background: var(--charcoal-light);
  border: 1px solid hsla(0, 0%, 100%, 0.06);
  border-radius: var(--border-radius);
  position: relative;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: translateY(40px) scale(0.96);
  transition: transform var(--transition-slow);
}

html[data-theme="light"] .model-overlay-content {
  border-color: var(--charcoal-lighter);
}

.model-overlay.active .model-overlay-content {
  transform: translateY(0) scale(1);
}

/* Close Button */
.model-overlay-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--surface-glass);
  border: 1px solid var(--steel-border);
  color: var(--warm-white);
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  z-index: 2110;
}

.model-overlay-close:hover {
  background: var(--steel-glow);
  transform: scale(1.05);
}

/* Viewer Wrapper */
.model-overlay-viewer-wrapper {
  flex: 1;
  position: relative;
  background: radial-gradient(circle at 50% 50%, hsla(220, 15%, 16%, 0.5) 0%, transparent 80%);
  min-height: 0;
}

/* Info Panel */
.model-overlay-info {
  padding: var(--space-lg) var(--space-xl);
  background: rgba(10, 18, 28, 0.4);
  border-top: 1px solid hsla(0, 0%, 100%, 0.04);
}

html[data-theme="light"] .model-overlay-info {
  background: rgba(255, 255, 255, 0.4);
  border-top-color: var(--charcoal-lighter);
}

.model-overlay-title {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 600;
  margin-block-end: var(--space-xs);
  color: var(--warm-white);
}

.model-overlay-desc {
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--slate-light);
  line-height: 1.5;
}

/* Floating Fullscreen Trigger Button on the card container */
.model-fullscreen-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 36px;
  height: 36px;
  border-radius: var(--border-radius-sm);
  background: var(--surface-glass);
  border: 1px solid var(--steel-border);
  color: var(--warm-white);
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  z-index: 10;
}

.model-viewer-container:hover .model-fullscreen-btn {
  opacity: 1;
  visibility: visible;
}

/* Always show it on mobile/touch since there's no hover */
@media (hover: none) {
  .model-fullscreen-btn {
    opacity: 1;
    visibility: visible;
  }
}

.model-fullscreen-btn:hover {
  background: var(--steel-glow);
  border-color: var(--steel-glow);
  transform: scale(1.05);
}

/* Removed desktop viewport layout compression to maintain premium spacing and prevent nav collision */


/* ==========================================================================
   PROTOTYPE 1: TRANSIT MAP
   ========================================================================== */
.proto-transit-map {
  position: relative;
  padding-left: 60px;
  padding-top: 20px;
  padding-bottom: 20px;
}
.transit-line {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 8px;
  border-radius: 4px;
}
.transit-line-main {
  left: 20px;
  background: var(--charcoal-light);
  box-shadow: inset 0 0 5px rgba(0,0,0,0.5);
}
.transit-line-branch {
  left: 40px;
  background: var(--steel-light);
}

.transit-station {
  position: relative;
  margin-bottom: 40px;
}
.transit-station:last-child {
  margin-bottom: 0;
}

.transit-dot {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 3px solid var(--surface-bg);
  box-shadow: 0 0 10px rgba(0,0,0,0.5);
  z-index: 2;
}
.dot-main {
  left: -44px;
  background: var(--charcoal-lighter);
}
.dot-branch {
  left: -24px;
  background: var(--steel-light);
}

.transit-content {
  background: var(--surface-glass);
  border: 1px solid var(--steel-border);
  padding: 15px 20px;
  border-radius: 12px;
  width: 100%;
  max-width: 500px;
}
.transit-dates {
  display: inline-block;
  font-size: 0.75rem;
  color: var(--steel-light);
  text-transform: uppercase;
  margin-bottom: 2px;
}
.transit-role {
  display: inline-block;
  font-size: 1.1rem;
  color: var(--warm-white);
  font-weight: 600;
  margin-bottom: 2px;
}
.transit-company {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--warm-white-dim);
  font-style: italic;
}

/* ==========================================================================
   PROTOTYPE 2: EDITORIAL MAGAZINE
   ========================================================================== */
.proto-editorial-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.editorial-item {
  position: relative;
  padding: 60px 0;
  border-bottom: 1px solid var(--steel-border);
  overflow: hidden;
}
.editorial-watermark {
  position: absolute;
  top: 50%;
  left: -20px;
  transform: translateY(-50%);
  font-size: 8rem;
  font-family: var(--font-heading);
  font-weight: 900;
  color: rgba(255, 255, 255, 0.02);
  white-space: nowrap;
  pointer-events: none;
  z-index: 0;
}
.editorial-content {
  position: relative;
  z-index: 1;
}
.editorial-title {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 300;
  color: var(--warm-white);
  margin-bottom: 10px;
  letter-spacing: -0.02em;
}
.editorial-subtitle {
  font-size: 1.1rem;
  color: var(--steel-light);
  font-weight: 500;
}
.editorial-dates {
  font-size: 0.85rem;
  color: var(--warm-white-dim);
  margin-top: 5px;
  font-style: italic;
}

/* ==========================================================================
   PROTOTYPE 3: INTERACTIVE ACCORDION
   ========================================================================== */
.proto-accordion-list {
  display: flex;
  flex-direction: column;
  gap: 15px;
}
.accordion-item {
  background: var(--surface-glass);
  border: 1px solid var(--steel-border);
  border-radius: 12px;
  overflow: hidden;
}
.accordion-header {
  padding: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  background: transparent;
  outline: none;
}
.accordion-header::-webkit-details-marker {
  display: none;
}
.acc-role {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--warm-white);
}
.acc-date {
  font-size: 0.85rem;
  color: var(--steel-light);
}
.accordion-body {
  padding: 0 20px 20px;
  border-top: 1px solid rgba(255,255,255,0.05);
  margin-top: 10px;
  padding-top: 20px;
}
.acc-company {
  font-size: 0.95rem;
  color: var(--warm-white-dim);
  font-style: italic;
}


/* ==========================================================================
   BULLSEYE CAREER TARGET - PREMIUM AESTHETIC
   ========================================================================== */
.bullseye-wrapper {
  padding: 60px 0 80px 0;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: visible;
  position: relative;
  width: 100%;
}

.bullseye-container {
  position: relative;
  width: 100%;
  max-width: 650px;
  aspect-ratio: 1;
  border-radius: 50%;
  margin: 0 auto;
}

/* Subtle architectural rings */
.target-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  border: 1px dashed rgba(150, 150, 150, 0.3);
  transition: border-color 0.4s ease;
}

[data-theme="dark"] .target-ring {
  border: 1px dashed rgba(255, 255, 255, 0.15);
}

.target-ring:hover {
  border: 1px solid rgba(255, 138, 101, 0.4);
}

.target-ring-3 { width: 100%; height: 100%; } /* Outer */
.target-ring-2 { width: 66%; height: 66%; }   /* Middle */
.target-ring-1 { width: 33%; height: 33%; }   /* Inner */

/* Center Bullseye */
.bullseye-center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 16px;
  height: 16px;
  background-color: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 0 6px rgba(255, 138, 101, 0.15);
  z-index: 10;
}

.bullseye-label {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, 24px);
  color: var(--accent);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 3px;
  white-space: nowrap;
}

/* Target Nodes */
.target-node-group {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  z-index: 20;
}

.target-node {
  position: absolute;
  width: 10px;
  height: 10px;
  background-color: var(--bg-color);
  border: 2px solid var(--steel-light);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
}

.target-node-group:hover .target-node {
  background-color: var(--accent);
  border-color: var(--accent);
  transform: translate(-50%, -50%) scale(1.5);
  box-shadow: 0 0 15px rgba(255, 138, 101, 0.4);
}

/* Elegant Text Content (No clunky boxes) */
.target-content {
  position: absolute;
  width: max-content;
  max-width: 260px;
  padding: 10px 15px;
  transition: all 0.3s ease;
  opacity: 0.7;
}

.target-node-group:hover .target-content {
  opacity: 1;
  transform: translateY(-2px);
}

.target-role {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 500;
  color: var(--text-color);
  margin-bottom: 2px;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.target-dates {
  font-size: 0.75rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Specific Positioning to be wide and non-overlapping */

/* Outer Ring - Civil Engineer (Left edge) */
.node-1 { top: 0%; left: -50%; } /* Far left */
.content-1 { 
  top: 0%; 
  left: -50%; 
  transform: translate(-105%, -50%); 
  text-align: right;
}

/* Middle Ring - Transport Planner (Top Right) */
.node-2 { top: -23.33%; left: 23.33%; } /* 45 degrees top-right */
.content-2 { 
  top: -23.33%; 
  left: 23.33%; 
  transform: translate(15px, -50%); 
  text-align: left;
}

/* Inner Ring - Owner/Director (Bottom Right) */
.node-3 { top: 14.28%; left: 8.25%; } /* Bottom-right angle */
.content-3 { 
  top: 14.28%; 
  left: 8.25%; 
  transform: translate(15px, 0); 
  text-align: left;
}

/* Connecting Lines (Optional elegant touch) */
.target-content::before {
  content: "";
  position: absolute;
  top: 50%;
  width: 15px;
  height: 1px;
  background-color: var(--steel-border);
  transition: background-color 0.3s ease;
}

.target-node-group:hover .target-content::before {
  background-color: var(--accent);
}

.content-1::before { right: -15px; }
.content-2::before { left: -15px; }
.content-3::before { left: -15px; top: 12px; }

/* Responsive Adjustments */
@media (max-width: 900px) {
  .bullseye-container { max-width: 450px; }
  .target-role { font-size: 1.15rem; }
}

@media (max-width: 600px) {
  .bullseye-container { max-width: 280px; margin-bottom: 80px; }
  .content-1 { transform: translate(-50%, -130%); text-align: center; }
  .content-1::before { display: none; }
  
  .content-2 { transform: translate(-50%, -130%); text-align: center; }
  .content-2::before { display: none; }
  
  .content-3 { transform: translate(-10%, 20px); text-align: left; }
  .content-3::before { display: none; }
}

/* ── Fullscreen Document Lightbox ── */
.document-lightbox {
  position: fixed;
  inset: 0;
  background: rgba(10, 12, 16, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 3000;
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  opacity: 0;
  transition: opacity 0.3s ease;
  user-select: none;
  -webkit-user-select: none;
}

.document-lightbox.active {
  display: flex;
  opacity: 1;
}

.lightbox-close {
  position: absolute;
  top: 24px;
  right: 24px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(22, 26, 35, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--warm-white-dim);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 3010;
  transition: all var(--transition-base);
}

.lightbox-close:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  transform: rotate(90deg);
}

.lightbox-close .icon-svg {
  width: 20px;
  height: 20px;
  stroke-width: 2.25;
}

.lightbox-toolbar {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  background: rgba(22, 26, 35, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 6px 12px;
  border-radius: var(--border-radius-pill);
  z-index: 3010;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
  transition: all var(--transition-base);
}

.lightbox-toolbar:hover {
  background: rgba(22, 26, 35, 0.95);
  border-color: rgba(255, 255, 255, 0.2);
}

.lightbox-btn {
  background: none;
  border: none;
  color: var(--warm-white-dim);
  width: 32px;
  height: 32px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all var(--transition-fast);
}

.lightbox-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--accent);
}

.lightbox-btn .icon-svg {
  width: 18px;
  height: 18px;
  stroke-width: 2.25;
}

.lightbox-zoom-level {
  color: var(--warm-white);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0 8px;
  min-width: 48px;
  text-align: center;
  user-select: none;
}

.lightbox-divider {
  width: 1px;
  height: 20px;
  background: rgba(255, 255, 255, 0.15);
  margin: 0 4px;
}

.lightbox-viewport {
  width: 100%;
  height: 100%;
  overflow: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: grab;
  padding: 24px 24px 100px; /* Leave space at bottom for floating toolbar */
  box-sizing: border-box;
}

.lightbox-viewport:active {
  cursor: grabbing;
}

.document-lightbox.dragging .lightbox-image {
  transition: none !important;
}

.lightbox-image {
  max-width: 95%;
  max-height: 90vh;
  object-fit: contain;
  transition: transform 0.15s cubic-bezier(0.2, 0.8, 0.2, 1);
  transform-origin: center center;
  user-select: none;
  -webkit-user-drag: none;
}