/* ====================================================
   IIT BHILAI CSE PhD WEBSITE — FULL STYLESHEET
   Palette: Deep navy/indigo + electric cyan accent
   Fonts: Clash Display (headings) + Satoshi (body)
   ==================================================== */

/* === DESIGN TOKENS === */
:root,
[data-theme='light'] {
  --color-bg: #f5f7fc;
  --color-surface: #ffffff;
  --color-surface-2: #f0f3fa;
  --color-surface-offset: #e8ecf4;
  --color-divider: #dde1ee;
  --color-border: #c8cede;

  --color-text: #1a1f3c;
  --color-text-muted: #5a6180;
  --color-text-faint: #9ba3c0;
  --color-text-inverse: #ffffff;

  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-active: #1e40af;
  --color-primary-highlight: #dbeafe;

  --color-accent: #06b6d4;
  --color-accent-glow: rgba(6, 182, 212, 0.25);

  --color-gold: #f59e0b;
  --color-success: #10b981;
  --color-error: #ef4444;

  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 3px rgba(26,31,60,0.08);
  --shadow-md: 0 4px 16px rgba(26,31,60,0.1);
  --shadow-lg: 0 16px 48px rgba(26,31,60,0.14);
  --shadow-glow: 0 0 40px rgba(37, 99, 235, 0.15);

  --transition-fast: 150ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-interactive: 220ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 400ms cubic-bezier(0.16, 1, 0.3, 1);

  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);
  --text-hero: clamp(3rem, 0.5rem + 7vw, 7rem);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  --content-narrow: 680px;
  --content-default: 1000px;
  --content-wide: 1280px;

  --font-display: 'Clash Display', 'Georgia', serif;
  --font-body: 'Satoshi', 'Inter', sans-serif;

  --hero-gradient: linear-gradient(135deg, #1e1b4b 0%, #1e3a8a 50%, #0c4a6e 100%);
  --hero-grid-color: rgba(99,102,241,0.08);
}

[data-theme='dark'] {
  --color-bg: #0d1117;
  --color-surface: #161b27;
  --color-surface-2: #1c2233;
  --color-surface-offset: #1a2035;
  --color-divider: #232d45;
  --color-border: #2c3652;

  --color-text: #e2e8f8;
  --color-text-muted: #8895b8;
  --color-text-faint: #6272a4;
  --color-text-inverse: #0d1117;

  --color-primary: #3b82f6;
  --color-primary-hover: #60a5fa;
  --color-primary-active: #93c5fd;
  --color-primary-highlight: #1e3a8a33;

  --color-accent: #22d3ee;
  --color-accent-glow: rgba(34, 211, 238, 0.2);

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 60px rgba(59,130,246,0.2);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #0d1117;
    --color-surface: #161b27;
    --color-surface-2: #1c2233;
    --color-surface-offset: #1a2035;
    --color-divider: #232d45;
    --color-border: #2c3652;
    --color-text: #e2e8f8;
    --color-text-muted: #8895b8;
    --color-text-faint: #6272a4;
    --color-text-inverse: #0d1117;
    --color-primary: #3b82f6;
    --color-primary-hover: #60a5fa;
    --color-accent: #22d3ee;
    --color-accent-glow: rgba(34, 211, 238, 0.2);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
    --shadow-lg: 0 16px 48px rgba(0,0,0,0.5);
  }
}

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: var(--space-16);
  hanging-punctuation: first last;
}

body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--color-text);
  background: transparent;
  overflow-x: hidden;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}
ul[role='list'], ol[role='list'] { list-style: none; }
input, button, textarea, select { font: inherit; color: inherit; }
h1, h2, h3, h4, h5, h6 { text-wrap: balance; line-height: 1.15; }
p, li, figcaption { text-wrap: pretty; max-width: 72ch; }
::selection { background: color-mix(in oklab, var(--color-primary) 25%, transparent); }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; border-radius: var(--radius-sm); }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; background: none; border: none; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* === LAYOUT HELPERS === */
.container {
  width: 100%;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-4), 5vw, var(--space-16));
}

section {
  padding-block: clamp(var(--space-16), 8vw, var(--space-32));
}

/* === BUTTONS === */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-8);
  background: var(--color-primary);
  color: white;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: background var(--transition-interactive), transform var(--transition-fast), box-shadow var(--transition-interactive);
  box-shadow: 0 4px 16px color-mix(in oklab, var(--color-primary) 35%, transparent);
  white-space: nowrap;
}
.btn-primary:hover { background: var(--color-primary-hover); transform: translateY(-1px); box-shadow: 0 8px 24px color-mix(in oklab, var(--color-primary) 40%, transparent); }
.btn-primary:active { transform: translateY(0); }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border: 1.5px solid var(--color-border);
  color: var(--color-text);
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-full);
  transition: border-color var(--transition-interactive), color var(--transition-interactive), background var(--transition-interactive);
}
.btn-ghost:hover { border-color: var(--color-primary); color: var(--color-primary); background: var(--color-primary-highlight); }

/* === NAVBAR === */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(8, 14, 40, 0.45);
  backdrop-filter: blur(20px) saturate(1.3);
  -webkit-backdrop-filter: blur(20px) saturate(1.3);
  border-bottom: 1px solid rgba(255,255,255,0.1);
  transition: box-shadow var(--transition-interactive), background var(--transition-interactive);
}
.navbar.scrolled {
  background: rgba(8, 14, 40, 0.72);
  box-shadow: 0 2px 24px rgba(0,0,0,0.35);
  border-bottom-color: rgba(255,255,255,0.08);
}
/* Navbar text always white since it's over the image */
.nav-links a { color: rgba(255,255,255,0.75); }
.nav-links a:hover { color: white; }
.nav-logo-text { color: white; }
.nav-logo-dept { color: rgba(255,255,255,0.55); }
.theme-toggle { color: rgba(255,255,255,0.6); border-color: rgba(255,255,255,0.2); }
.theme-toggle:hover { color: white; border-color: rgba(255,255,255,0.4); background: rgba(255,255,255,0.08); }
.hamburger { color: rgba(255,255,255,0.7); }

.nav-inner {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-4), 4vw, var(--space-12));
  height: 64px;
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
  color: var(--color-text);
}
.nav-iit-logo {
  width: 38px;
  height: 38px;
  object-fit: contain;
  border-radius: 50%;
  flex-shrink: 0;
  background: white;
  padding: 2px;
}
.nav-logo-text { font-size: var(--text-sm); line-height: 1.2; }
.nav-logo-text strong { font-weight: 700; font-family: var(--font-display); }
.nav-logo-dept {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  display: block;
  margin-top: 1px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  margin-left: auto;
  list-style: none;
}
.nav-links a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
  white-space: nowrap;
}
.nav-links a:hover { color: var(--color-text); }
.nav-links a.nav-cta {
  padding: var(--space-2) var(--space-5);
  background: var(--color-primary);
  color: white;
  border-radius: var(--radius-full);
  font-weight: 600;
  transition: background var(--transition-interactive);
}
.nav-links a.nav-cta:hover { background: var(--color-primary-hover); color: white; }

.nav-controls {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}
.theme-toggle:hover { color: var(--color-text); border-color: var(--color-text-muted); background: var(--color-surface-2); }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
}
.hamburger span {
  display: block;
  width: 20px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--transition-interactive), opacity var(--transition-fast);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
  display: none;
  flex-direction: column;
  padding: var(--space-4) clamp(var(--space-4), 4vw, var(--space-12));
  border-top: 1px solid rgba(255,255,255,0.1);
  background: rgba(8, 14, 40, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  padding: var(--space-3) 0;
  font-size: var(--text-base);
  font-weight: 500;
  color: rgba(255,255,255,0.65);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  transition: color var(--transition-fast);
}
.mobile-menu a:last-child { border-bottom: none; }
.mobile-menu a:hover { color: white; }
.mobile-menu .mobile-cta {
  margin-top: var(--space-4);
  padding: var(--space-3) var(--space-6);
  background: var(--color-primary);
  color: white;
  border-radius: var(--radius-full);
  text-align: center;
  font-weight: 600;
  border: none;
}

/* === FIXED CAMPUS BACKGROUND === */
.campus-fixed-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}
.campus-fixed-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  display: block;
}
.campus-fixed-overlay {
  position: absolute;
  inset: 0;
  background: rgba(5, 10, 28, 0.38);
}

/* Light mode: slightly lighter overlay */
[data-theme='light'] .campus-fixed-overlay {
  background: rgba(5, 10, 28, 0.28);
}

/* === HERO — Full-bleed + Glassmorphism Modal === */
.hero {
  position: relative;
  width: 100%;
  min-height: 100dvh;
  padding-top: 64px;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  overflow: hidden;
  background: transparent;
  padding-inline: clamp(var(--space-6), 8vw, var(--space-24));
}

/* Floating glass modal */
.hero-glass {
  position: relative;
  z-index: 10;
  width: min(600px, calc(100vw - 2rem));
  background: rgba(8, 14, 40, 0.38);
  backdrop-filter: blur(22px) saturate(1.5);
  -webkit-backdrop-filter: blur(22px) saturate(1.5);
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: var(--radius-xl);
  padding: clamp(var(--space-8), 5vw, var(--space-12));
  box-shadow:
    0 8px 40px rgba(0,0,0,0.25),
    0 0 0 1px rgba(255,255,255,0.08) inset,
    0 2px 0 rgba(255,255,255,0.15) inset;
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

/* IIT Logo + Name row */
.hero-identity {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}
.hero-iit-logo {
  width: 92px;
  height: 92px;
  border-radius: 50%;
  object-fit: contain;
  flex-shrink: 0;
  background: white;
  padding: 4px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.4), 0 0 0 2px rgba(255,255,255,0.25);
}
.hero-identity-text { display: flex; flex-direction: column; gap: 3px; }
.hero-inst-name {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  color: white;
  line-height: 1.3;
  letter-spacing: 0.01em;
}
.hero-dept-name {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.7);
  font-weight: 500;
  letter-spacing: 0.02em;
}

/* Divider line */
.hero-divider {
  height: 1px;
  background: rgba(255,255,255,0.12);
  margin-block: var(--space-1);
}

/* Admissions badge */
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: rgba(6, 182, 212, 0.18);
  border: 1px solid rgba(6, 182, 212, 0.4);
  border-radius: var(--radius-full);
  color: #67e8f9;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  width: fit-content;
}
.hero-badge-dot {
  width: 6px;
  height: 6px;
  background: #22d3ee;
  border-radius: 50%;
  flex-shrink: 0;
  animation: blink 2s infinite;
}

/* Main heading */
.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 700;
  line-height: 1.05;
  color: white;
  letter-spacing: -0.02em;
  margin-block: var(--space-1);
}
.hero-accent {
  background: linear-gradient(135deg, #67e8f9, #818cf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Description */
.hero-desc {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.72);
  line-height: 1.7;
  max-width: 52ch;
}

/* CTA buttons */
.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
}
.btn-ghost-hero {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border: 1.5px solid rgba(255,255,255,0.3);
  color: rgba(255,255,255,0.9);
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-full);
  transition: border-color var(--transition-interactive), color var(--transition-interactive), background var(--transition-interactive);
}
.btn-ghost-hero:hover {
  border-color: rgba(255,255,255,0.6);
  color: white;
  background: rgba(255,255,255,0.08);
}

/* Stats strip */
.hero-stats {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
  padding-top: var(--space-4);
  border-top: 1px solid rgba(255,255,255,0.1);
}
.stat { display: flex; flex-direction: column; gap: 2px; }
.stat-num {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: white;
  line-height: 1;
}
.stat-label {
  font-size: 0.65rem;
  color: rgba(255,255,255,0.5);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  white-space: nowrap;
}
.stat-divider {
  width: 1px;
  height: 32px;
  background: rgba(255,255,255,0.15);
  flex-shrink: 0;
}

/* Scroll hint */
.hero-scroll-hint {
  position: absolute;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  color: rgba(255,255,255,0.45);
  font-size: var(--text-xs);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  animation: scrollBounce 2.5s ease-in-out infinite;
}
.scroll-dot { animation: scrollMove 2.5s ease-in-out infinite; }

/* === SECTION HEADERS === */
.section-label {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}
.section-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
}
.section-sub {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 60ch;
  line-height: 1.7;
  margin-bottom: var(--space-12);
}


/* ====================================================
   GLASS SECTIONS — all sections float over fixed bg
   ==================================================== */

/* Each section becomes a glass panel */
.why-join,
.program,
.research,
.faculty-section,
.facilities,
.campus,
.apply-section,
.footer {
  background: transparent;
  position: relative;
  z-index: 2;
}

/* Glass panel wrapper inside each section */
.why-join .container,
.program .container,
.research .container,
.faculty-section .container,
.facilities .container,
.campus .container,
.apply-section .apply-inner {
  background: rgba(8, 14, 40, 0.42);
  backdrop-filter: blur(28px) saturate(1.5);
  -webkit-backdrop-filter: blur(28px) saturate(1.5);
  border: 1px solid rgba(255,255,255,0.13);
  border-radius: var(--radius-xl);
  padding: clamp(var(--space-10), 5vw, var(--space-16));
  box-shadow:
    0 8px 40px rgba(0,0,0,0.22),
    0 0 0 1px rgba(255,255,255,0.07) inset;
  margin-block: 0;
}

/* Footer glass */
.footer {
  background: rgba(5, 10, 28, 0.55);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid rgba(255,255,255,0.12);
}

/* Make text readable on glass dark bg */
.why-join .section-title,
.program .section-title,
.research .section-title,
.faculty-section .section-title,
.facilities .section-title,
.campus .section-title,
.apply-title { color: white; }

.why-join .section-sub,
.program .section-sub,
.research .section-sub,
.faculty-section .section-sub { color: rgba(255,255,255,0.68); }

.why-join .section-label,
.program .section-label,
.research .section-label,
.faculty-section .section-label,
.facilities .section-label,
.campus .section-label { color: #67e8f9; }

/* Cards inside glass sections */
.why-card,
.track-card,
.research-cluster,
.faculty-card,
.facility-card,
.campus-card,
.eligibility,
.elig-item {
  background: rgba(255,255,255,0.06) !important;
  border-color: rgba(255,255,255,0.12) !important;
  color: rgba(255,255,255,0.9);
}
.why-card h3,
.cluster-name,
.faculty-name,
.facility-content h3,
.campus-card h4,
.eligibility-title,
.track-name { color: white !important; }

.why-card p,
.track-desc,
.research-cluster li,
.faculty-phd,
.facility-content p,
.campus-card p,
.elig-text { color: rgba(255,255,255,0.75) !important; }

.why-card--featured {
  background: rgba(255,255,255,0.09) !important;
  border-color: rgba(99,162,255,0.25) !important;
}

/* Research cluster items */
.research-cluster li {
  background: rgba(255,255,255,0.06) !important;
  border-left-color: var(--color-accent) !important;
}

/* Faculty avatar fallback */
.faculty-avatar {
  background: linear-gradient(135deg, rgba(37,99,235,0.5), rgba(6,182,212,0.4)) !important;
  color: white !important;
}

/* Faculty tags */
.ftag {
  background: rgba(255,255,255,0.1) !important;
  border-color: rgba(255,255,255,0.15) !important;
  color: rgba(255,255,255,0.75) !important;
}

/* Faculty rank badges stay coloured */
.faculty-rank-badge,
.faculty-rank-badge.assoc,
.faculty-rank-badge.asst { opacity: 1; }

/* Track card dark variant */
.track-card--dsai {
  background: rgba(255,255,255,0.07) !important;
  border-color: rgba(255,255,255,0.15) !important;
}

/* Facility visual cards */
.facility-card--outlay {
  background: linear-gradient(160deg, rgba(30,27,75,0.8), rgba(49,46,129,0.8), rgba(30,58,138,0.8)) !important;
  border-color: rgba(99,102,241,0.4) !important;
}

/* Eligibility items */
.elig-item { background: rgba(255,255,255,0.05) !important; }
.elig-text strong { color: white !important; }

/* Deadline banner */
.deadline-banner {
  background: linear-gradient(135deg, rgba(30,27,75,0.85), rgba(30,58,138,0.85));
}

/* Apply section */
.apply-desc { color: rgba(255,255,255,0.68) !important; }
.apply-desc strong { color: white !important; }
.step-text { color: rgba(255,255,255,0.65) !important; }
.step-text strong { color: white !important; }
.step-num {
  background: rgba(59,130,246,0.25) !important;
  color: #93c5fd !important;
}
.apply-contact { color: rgba(255,255,255,0.45) !important; }
.btn-ghost-light {
  border-color: rgba(255,255,255,0.25) !important;
  color: rgba(255,255,255,0.8) !important;
}
.btn-ghost-light:hover {
  border-color: rgba(255,255,255,0.6) !important;
  color: white !important;
  background: rgba(255,255,255,0.08) !important;
}

/* Faculty link */
.faculty-link { color: #67e8f9 !important; }
.faculty-link:hover { color: white !important; }

/* Footer */
.footer-name { color: white; }
.footer-tagline { color: rgba(255,255,255,0.5); }
.footer-links a { color: rgba(255,255,255,0.55); }
.footer-links a:hover { color: white; }
.footer-copy { color: rgba(255,255,255,0.3); }

/* Campus overlay section */
.campus-overlay h3 { color: white; }
.campus-overlay p { color: rgba(255,255,255,0.82); }

/* Section spacer — gap between glass panels */
section { padding-block: clamp(var(--space-8), 4vw, var(--space-16)); }

/* Gaps between glass panels */
.why-join { padding-top: 0; }
.why-join .container,
.program .container,
.research .container,
.faculty-section .container,
.facilities .container,
.campus .container {
  margin-inline: auto;
  max-width: var(--content-wide);
}

/* Apply inner needs width constraint too */
.apply-section { padding-block: clamp(var(--space-8), 4vw, var(--space-16)); }
.apply-section .apply-inner {
  max-width: 820px;
  margin-inline: auto;
  padding-inline: clamp(var(--space-8), 5vw, var(--space-12));
}
.apply-bg-gradient { display: none; }
.research-bg-accent { display: none; }

/* === WHY JOIN === */
.why-join { }
.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-5);
}
.why-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  transition: transform var(--transition-interactive), box-shadow var(--transition-interactive), border-color var(--transition-interactive);
}
.why-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}
.why-card--featured {
  background: inherit;
  border-color: var(--color-border);
  color: inherit;
}
.why-card--featured h3 { color: var(--color-text); }
.why-card--featured p { color: var(--color-text-muted); max-width: 100%; }

.why-icon { font-size: 2rem; margin-bottom: var(--space-4); }
.why-card h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}
.why-card p { font-size: var(--text-base); color: var(--color-text-muted); max-width: 100%; line-height: 1.65; }

/* === PROGRAM === */
.program { }
.program-tracks {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  margin-bottom: var(--space-12);
}
.track-card {
  border-radius: var(--radius-xl);
  padding: var(--space-10);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  transition: transform var(--transition-interactive), box-shadow var(--transition-interactive);
}
.track-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.track-card--dsai {
  background: var(--color-surface);
  border-color: var(--color-border);
  color: inherit;
}
.track-card--dsai .track-name { color: var(--color-text); }
.track-card--dsai .track-tag,
.track-card--dsai .track-abbr,
.track-card--dsai .track-desc { color: var(--color-text-muted); }
.track-card--dsai .track-areas li::before { color: var(--color-accent); }

.track-header {
  display: flex;
  align-items: flex-start;
  gap: var(--space-5);
  margin-bottom: var(--space-6);
}
.track-icon { font-size: 2.5rem; flex-shrink: 0; }
.track-tag {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-1);
}
.track-name {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.25;
  margin-bottom: var(--space-1);
}
.track-abbr { font-size: var(--text-xs); color: var(--color-text-muted); font-weight: 600; }
.track-desc { font-size: var(--text-base); color: var(--color-text-muted); margin-bottom: var(--space-6); line-height: 1.65; max-width: 100%; }
.track-areas { list-style: none; display: flex; flex-direction: column; gap: var(--space-2); }
.track-areas li {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding-left: var(--space-5);
  position: relative;
  max-width: 100%;
}
.track-areas li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 700;
}

.eligibility {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-10);
  margin-bottom: var(--space-8);
}
.eligibility-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-6);
}
.eligibility-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-4);
}
.elig-item {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-5);
  background: var(--color-surface-2);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-divider);
}
.elig-icon { font-size: 1.5rem; flex-shrink: 0; }
.elig-text { font-size: var(--text-sm); color: var(--color-text-muted); max-width: 100%; line-height: 1.5; }
.elig-text strong { color: var(--color-text); }

.deadline-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  background: linear-gradient(135deg, #1e1b4b, #1e3a8a);
  border-radius: var(--radius-xl);
  padding: var(--space-8) var(--space-10);
  flex-wrap: wrap;
}
.deadline-label {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.6);
  margin-bottom: var(--space-1);
}
.deadline-date {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: white;
}
.deadline-time {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 400;
  color: rgba(255,255,255,0.65);
}
.deadline-btn { background: white; color: #1e1b4b; font-weight: 700; }
.deadline-btn:hover { background: rgba(255,255,255,0.9); color: #1e1b4b; }

/* === RESEARCH === */
.research {
  position: relative;
  overflow: hidden;
}
.research-bg-accent {
  position: absolute;
  top: 0; right: 0;
  width: 500px; height: 500px;
  background: radial-gradient(circle, color-mix(in oklab, var(--color-primary) 8%, transparent) 0%, transparent 70%);
  pointer-events: none;
}
.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-5);
}
.research-cluster {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  transition: transform var(--transition-interactive), box-shadow var(--transition-interactive), border-color var(--transition-interactive);
}
.research-cluster:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-accent);
}
.cluster-icon { font-size: 2rem; margin-bottom: var(--space-4); }
.cluster-name {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-5);
}
.research-cluster ul { list-style: none; display: flex; flex-direction: column; gap: var(--space-2); }
.research-cluster li {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-3);
  background: var(--color-surface-2);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--color-accent);
  max-width: 100%;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.research-cluster:hover li { background: var(--color-surface-offset); }

/* === FACULTY === */
.faculty-section { }

.faculty-filter {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-10);
}
.filter-btn {
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-full);
  border: 1.5px solid var(--color-border);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  background: var(--color-surface);
  cursor: pointer;
  transition: all var(--transition-interactive);
}
.filter-btn:hover { border-color: var(--color-primary); color: var(--color-primary); }
.filter-btn.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
}

.faculty-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-6);
}
.faculty-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: transform var(--transition-interactive), box-shadow var(--transition-interactive), border-color var(--transition-interactive);
}
.faculty-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}
.faculty-card.hidden { display: none; }

.faculty-photo-wrap {
  width: 100%;
  aspect-ratio: 4/3;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-surface-offset), var(--color-surface-2));
  position: relative;
}
.faculty-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  transition: transform var(--transition-slow);
}
.faculty-card:hover .faculty-photo { transform: scale(1.04); }
.faculty-avatar {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-primary);
  background: linear-gradient(135deg, var(--color-primary-highlight), var(--color-surface-offset));
  letter-spacing: -0.02em;
}

.faculty-info { padding: var(--space-6); }
.faculty-rank-badge {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.03em;
  margin-bottom: var(--space-3);
  background: linear-gradient(135deg, var(--color-primary), #1d4ed8);
  color: white;
}
.faculty-rank-badge.assoc {
  background: linear-gradient(135deg, #0891b2, #0e7490);
}
.faculty-rank-badge.asst {
  background: linear-gradient(135deg, #059669, #047857);
}
.faculty-name {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-1);
  line-height: 1.3;
}
.faculty-phd {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  font-weight: 500;
}
.faculty-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
}
.ftag {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 3px 10px;
  background: var(--color-surface-2);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  white-space: nowrap;
}
.faculty-link {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary);
  transition: color var(--transition-fast);
}
.faculty-link:hover { color: var(--color-primary-hover); }

.faculty-cta-bar {
  text-align: center;
  margin-top: var(--space-12);
}

/* === FACILITIES === */
.facilities { }
.facilities-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: auto auto;
  gap: var(--space-5);
}
.facility-card--large { grid-column: 1 / 3; }
.facility-card--outlay { grid-column: 3; grid-row: 1 / 3; }

.facility-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: transform var(--transition-interactive), box-shadow var(--transition-interactive), border-color var(--transition-interactive);
}
.facility-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-accent);
}
.facility-visual {
  position: relative;
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.facility-visual--gpu { background: linear-gradient(135deg, #1e1b4b, #312e81); }
.facility-visual--hpc { background: linear-gradient(135deg, #0c4a6e, #0369a1); }
.facility-visual--bigdata { background: linear-gradient(135deg, #064e3b, #065f46); }
.facility-visual--systems { background: linear-gradient(135deg, #4c1d95, #5b21b6); }
.facility-visual--dataviz { background: linear-gradient(135deg, #7c2d12, #9a3412); }

.facility-glow {
  position: absolute;
  inset: -20%;
  background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, transparent 60%);
}
.facility-icon-large { font-size: 3rem; position: relative; z-index: 1; }

.facility-content { padding: var(--space-6); }
.facility-content h3 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}
.facility-content p { font-size: var(--text-sm); color: var(--color-text-muted); max-width: 100%; line-height: 1.6; }

.facility-card--outlay {
  background: linear-gradient(160deg, #1e1b4b, #312e81, #1e3a8a);
  border-color: rgba(99,102,241,0.4);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-10);
  text-align: center;
  gap: var(--space-2);
}
.outlay-number {
  font-family: var(--font-display);
  font-size: clamp(3rem, 5vw, 5rem);
  font-weight: 700;
  color: white;
  line-height: 1;
}
.outlay-plus { color: var(--color-accent); }
.outlay-label {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: rgba(255,255,255,0.7);
  margin-bottom: var(--space-4);
}
.outlay-desc { font-size: var(--text-sm); color: rgba(255,255,255,0.55); max-width: 24ch; line-height: 1.6; }

/* === CAMPUS === */
.campus { }
.campus-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  align-items: start;
}
.campus-feature--wide {
  border-radius: var(--radius-xl);
  overflow: hidden;
  position: relative;
  aspect-ratio: 4/3;
  background: var(--color-surface-offset);
}
.campus-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}
.campus-feature--wide:hover .campus-img { transform: scale(1.03); }
.campus-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.75) 0%, transparent 50%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--space-8);
}
.campus-overlay h3 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: white;
  margin-bottom: var(--space-2);
}
.campus-overlay p { font-size: var(--text-sm); color: rgba(255,255,255,0.8); max-width: 42ch; line-height: 1.65; }

.campus-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}
.campus-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: transform var(--transition-interactive), box-shadow var(--transition-interactive);
}
.campus-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.campus-card-icon { font-size: 1.75rem; margin-bottom: var(--space-3); }
.campus-card h4 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}
.campus-card p { font-size: var(--text-sm); color: var(--color-text-muted); line-height: 1.6; max-width: 100%; }

/* === APPLY === */
.apply-section {
  position: relative;
  overflow: hidden;
}
.apply-bg-gradient {
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(ellipse at top left, color-mix(in oklab, var(--color-primary) 10%, transparent) 0%, transparent 60%),
    radial-gradient(ellipse at bottom right, color-mix(in oklab, var(--color-accent) 8%, transparent) 0%, transparent 60%);
  pointer-events: none;
}
.apply-inner {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
}
.apply-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-5);
  background: color-mix(in oklab, var(--color-success) 15%, transparent);
  border: 1px solid color-mix(in oklab, var(--color-success) 35%, transparent);
  border-radius: var(--radius-full);
  color: var(--color-success);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--space-6);
}
.apply-badge::before {
  content: '';
  width: 7px; height: 7px;
  background: var(--color-success);
  border-radius: 50%;
  animation: blink 2s infinite 0.5s;
}
.apply-title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-6);
}
.apply-desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 55ch;
  margin-inline: auto;
  margin-bottom: var(--space-10);
  line-height: 1.7;
}
.apply-desc strong { color: var(--color-text); }

.apply-steps {
  display: flex;
  gap: var(--space-8);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--space-12);
}
.apply-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  text-align: center;
  max-width: 200px;
}
.step-num {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary);
  width: 56px; height: 56px;
  border-radius: 50%;
  background: var(--color-primary-highlight);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.step-text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  max-width: 100%;
}
.step-text strong { color: var(--color-text); }

.apply-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  justify-content: center;
  margin-bottom: var(--space-8);
}
.btn-apply {
  display: inline-flex;
  align-items: center;
  padding: var(--space-4) var(--space-10);
  background: var(--color-primary);
  color: white;
  font-size: var(--text-base);
  font-weight: 700;
  border-radius: var(--radius-full);
  box-shadow: 0 8px 32px color-mix(in oklab, var(--color-primary) 40%, transparent);
  transition: all var(--transition-interactive);
}
.btn-apply:hover { background: var(--color-primary-hover); transform: translateY(-2px); box-shadow: 0 12px 40px color-mix(in oklab, var(--color-primary) 50%, transparent); }

.btn-ghost-light {
  display: inline-flex;
  align-items: center;
  padding: var(--space-4) var(--space-8);
  border: 1.5px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: var(--text-base);
  font-weight: 500;
  border-radius: var(--radius-full);
  transition: all var(--transition-interactive);
}
.btn-ghost-light:hover { border-color: var(--color-primary); color: var(--color-primary); background: var(--color-primary-highlight); }

.apply-contact {
  font-size: var(--text-sm);
  color: var(--color-text-faint);
}
.contact-link { color: var(--color-primary); font-weight: 600; transition: color var(--transition-fast); }
.contact-link:hover { color: var(--color-primary-hover); }

/* === FOOTER === */
.footer {
  padding-block: var(--space-10);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-8);
  justify-content: space-between;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}
.footer-iit-logo {
  width: 44px;
  height: 44px;
  object-fit: contain;
  border-radius: 50%;
  flex-shrink: 0;
  background: white;
  padding: 2px;
}
.footer-name {
  font-weight: 700;
  font-size: var(--text-sm);
  color: var(--color-text);
}
.footer-tagline { font-size: var(--text-xs); color: var(--color-text-muted); }
.footer-links {
  display: flex;
  gap: var(--space-6);
  flex-wrap: wrap;
}
.footer-links a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}
.footer-links a:hover { color: var(--color-primary); }
.footer-copy {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  width: 100%;
}

/* === SCROLL ANIMATIONS === */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }


/* ====================================================
   LIGHT MODE — warm translucent glass panels
   ==================================================== */
[data-theme='light'] .campus-fixed-overlay {
  background: rgba(240, 235, 220, 0.18);
}

[data-theme='light'] .navbar {
  background: rgba(255, 252, 245, 0.72);
  border-bottom-color: rgba(0,0,0,0.08);
}
[data-theme='light'] .navbar.scrolled {
  background: rgba(255, 252, 245, 0.88);
  box-shadow: 0 2px 20px rgba(0,0,0,0.12);
}
[data-theme='light'] .nav-links a { color: rgba(30, 25, 60, 0.75); }
[data-theme='light'] .nav-links a:hover { color: #1e193c; }
[data-theme='light'] .nav-logo-text { color: #1e193c; }
[data-theme='light'] .nav-logo-dept { color: rgba(30,25,60,0.5); }
[data-theme='light'] .theme-toggle { color: rgba(30,25,60,0.6); border-color: rgba(30,25,60,0.2); }
[data-theme='light'] .theme-toggle:hover { color: #1e193c; border-color: rgba(30,25,60,0.4); background: rgba(30,25,60,0.06); }
[data-theme='light'] .hamburger { color: rgba(30,25,60,0.7); }
[data-theme='light'] .mobile-menu {
  background: rgba(255, 252, 245, 0.95);
  border-top-color: rgba(0,0,0,0.08);
}
[data-theme='light'] .mobile-menu a { color: rgba(30,25,60,0.7); border-bottom-color: rgba(0,0,0,0.06); }
[data-theme='light'] .mobile-menu a:hover { color: #1e193c; }

[data-theme='light'] .hero-glass {
  background: rgba(255, 252, 245, 0.38);
  border-color: rgba(0,0,0,0.1);
  box-shadow: 0 8px 40px rgba(0,0,0,0.12), 0 0 0 1px rgba(255,255,255,0.7) inset;
}
[data-theme='light'] .hero-title { color: #1a1040; }
[data-theme='light'] .hero-sub { color: rgba(26,16,64,0.75); }
[data-theme='light'] .hero-desc { color: rgba(26,16,64,0.7); }
[data-theme='light'] .hero-inst-name { color: #1a1040; }
[data-theme='light'] .hero-dept-name { color: rgba(26,16,64,0.65); }
[data-theme='light'] .hero-divider { background: rgba(0,0,0,0.1); }
[data-theme='light'] .stat-num { color: #1a1040; }
[data-theme='light'] .stat-label { color: rgba(26,16,64,0.5); }
[data-theme='light'] .stat-divider { background: rgba(0,0,0,0.12); }
[data-theme='light'] .hero-scroll-hint { color: rgba(26,16,64,0.4); }
[data-theme='light'] .btn-ghost-hero {
  border-color: rgba(0,0,0,0.2);
  color: rgba(26,16,64,0.85);
}
[data-theme='light'] .btn-ghost-hero:hover {
  border-color: rgba(0,0,0,0.4);
  color: #1a1040;
  background: rgba(0,0,0,0.05);
}

[data-theme='light'] .why-join .container,
[data-theme='light'] .program .container,
[data-theme='light'] .research .container,
[data-theme='light'] .faculty-section .container,
[data-theme='light'] .facilities .container,
[data-theme='light'] .campus .container,
[data-theme='light'] .apply-section .apply-inner {
  background: rgba(255, 252, 245, 0.42);
  border-color: rgba(0,0,0,0.08);
  box-shadow: 0 8px 40px rgba(0,0,0,0.1), 0 0 0 1px rgba(255,255,255,0.8) inset;
}

[data-theme='light'] .footer {
  background: rgba(255, 250, 240, 0.72);
  border-top-color: rgba(0,0,0,0.08);
}
[data-theme='light'] .footer-name { color: #1a1040; }
[data-theme='light'] .footer-tagline { color: rgba(26,16,64,0.5); }
[data-theme='light'] .footer-links a { color: rgba(26,16,64,0.6); }
[data-theme='light'] .footer-links a:hover { color: #1a1040; }
[data-theme='light'] .footer-copy { color: rgba(26,16,64,0.35); }

[data-theme='light'] .why-join .section-title,
[data-theme='light'] .program .section-title,
[data-theme='light'] .research .section-title,
[data-theme='light'] .faculty-section .section-title,
[data-theme='light'] .facilities .section-title,
[data-theme='light'] .campus .section-title,
[data-theme='light'] .apply-title { color: #1a1040; }

[data-theme='light'] .why-join .section-sub,
[data-theme='light'] .program .section-sub,
[data-theme='light'] .research .section-sub,
[data-theme='light'] .faculty-section .section-sub { color: rgba(26,16,64,0.65); }

[data-theme='light'] .why-join .section-label,
[data-theme='light'] .program .section-label,
[data-theme='light'] .research .section-label,
[data-theme='light'] .faculty-section .section-label,
[data-theme='light'] .facilities .section-label,
[data-theme='light'] .campus .section-label { color: #1d4ed8; }

[data-theme='light'] .why-card,
[data-theme='light'] .track-card,
[data-theme='light'] .research-cluster,
[data-theme='light'] .faculty-card,
[data-theme='light'] .facility-card,
[data-theme='light'] .campus-card,
[data-theme='light'] .eligibility {
  background: rgba(255,255,255,0.72) !important;
  border-color: rgba(0,0,0,0.08) !important;
  color: #1a1040 !important;
}
[data-theme='light'] .elig-item {
  background: rgba(255,255,255,0.88) !important;
  border-color: rgba(37,99,235,0.12) !important;
  color: #1a1040 !important;
}
[data-theme='light'] .why-card h3,
[data-theme='light'] .cluster-name,
[data-theme='light'] .faculty-name,
[data-theme='light'] .facility-content h3,
[data-theme='light'] .campus-card h4,
[data-theme='light'] .eligibility-title,
[data-theme='light'] .track-name { color: #1a1040 !important; }

[data-theme='light'] .why-card p,
[data-theme='light'] .track-desc,
[data-theme='light'] .research-cluster li,
[data-theme='light'] .faculty-phd,
[data-theme='light'] .facility-content p,
[data-theme='light'] .campus-card p,
[data-theme='light'] .elig-text { color: rgba(26,16,64,0.62) !important; }
[data-theme='light'] .elig-text strong { color: #1a1040 !important; font-weight: 700; }

[data-theme='light'] .research-cluster li {
  background: rgba(255,255,255,0.5) !important;
}
[data-theme='light'] .ftag {
  background: rgba(0,0,0,0.06) !important;
  border-color: rgba(0,0,0,0.1) !important;
  color: rgba(26,16,64,0.7) !important;
}
[data-theme='light'] .faculty-link { color: #1d4ed8 !important; }
[data-theme='light'] .faculty-link:hover { color: #1e40af !important; }
[data-theme='light'] .faculty-avatar {
  background: linear-gradient(135deg, rgba(37,99,235,0.2), rgba(6,182,212,0.15)) !important;
  color: #1d4ed8 !important;
}
[data-theme='light'] .why-card--featured {
  background: rgba(255,255,255,0.75) !important;
  border-color: rgba(37,99,235,0.2) !important;
}
[data-theme='light'] .track-card--dsai {
  background: rgba(255,255,255,0.75) !important;
  border-color: rgba(37,99,235,0.2) !important;
}
[data-theme='light'] .deadline-banner {
  background: linear-gradient(135deg, rgba(30,27,75,0.72), rgba(30,58,138,0.72));
}
[data-theme='light'] .apply-desc { color: rgba(26,16,64,0.68) !important; }
[data-theme='light'] .apply-desc strong { color: #1a1040 !important; }
[data-theme='light'] .step-text { color: rgba(26,16,64,0.65) !important; }
[data-theme='light'] .step-text strong { color: #1a1040 !important; }
[data-theme='light'] .step-num { background: rgba(37,99,235,0.12) !important; color: #1d4ed8 !important; }
[data-theme='light'] .apply-contact { color: rgba(26,16,64,0.5) !important; }
[data-theme='light'] .contact-link { color: #1d4ed8 !important; }
[data-theme='light'] .btn-ghost-light {
  border-color: rgba(0,0,0,0.2) !important;
  color: rgba(26,16,64,0.8) !important;
}
[data-theme='light'] .btn-ghost-light:hover {
  border-color: #1d4ed8 !important;
  color: #1d4ed8 !important;
  background: rgba(37,99,235,0.06) !important;
}
[data-theme='light'] .hero-badge {
  background: rgba(37,99,235,0.12);
  border-color: rgba(37,99,235,0.3);
  color: #1d4ed8;
}
[data-theme='light'] .hero-badge-dot { background: #1d4ed8; }
[data-theme='light'] .apply-badge {
  background: rgba(16,185,129,0.12);
  border-color: rgba(16,185,129,0.3);
  color: #059669;
}
[data-theme='light'] .apply-badge::before { background: #059669; }
[data-theme='light'] .filter-btn {
  background: rgba(255,255,255,0.5);
  border-color: rgba(0,0,0,0.12);
  color: rgba(26,16,64,0.7);
}
[data-theme='light'] .filter-btn.active {
  background: #2563eb;
  border-color: #2563eb;
  color: white;
}
[data-theme='light'] .filter-btn:hover {
  border-color: #2563eb;
  color: #2563eb;
}


/* === QR CODE & APPLY CONTACT === */
.apply-qr-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-10);
  flex-wrap: wrap;
  padding-top: var(--space-4);
}
.apply-contact {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.5);
  text-align: center;
  line-height: 1.7;
}
.apply-qr {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}
.qr-wrap {
  display: block;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 3px solid rgba(255,255,255,0.2);
  transition: border-color var(--transition-fast), transform var(--transition-interactive);
  background: white;
  padding: 4px;
}
.qr-wrap:hover { border-color: var(--color-accent); transform: scale(1.04); }
.qr-img {
  width: 100px;
  height: 100px;
  display: block;
}
.qr-label {
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.5);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
[data-theme='light'] .apply-contact { color: rgba(26,16,64,0.55) !important; }
[data-theme='light'] .qr-wrap { border-color: rgba(0,0,0,0.15); }
[data-theme='light'] .qr-label { color: rgba(26,16,64,0.45); }

/* === RESPONSIVE === */
@media (max-width: 1024px) {
  .facilities-grid { grid-template-columns: 1fr 1fr; }
  .facility-card--large { grid-column: 1 / 3; }
  .facility-card--outlay { grid-column: 1 / 3; grid-row: auto; }
  .campus-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .program-tracks { grid-template-columns: 1fr; }
  .facilities-grid { grid-template-columns: 1fr; }
  .facility-card--large,
  .facility-card--outlay { grid-column: auto; grid-row: auto; }
  .apply-steps { gap: var(--space-6); }
  .footer-inner { flex-direction: column; align-items: flex-start; gap: var(--space-5); }
  .stat-divider { display: none; }
  .hero-stats { gap: var(--space-3); flex-wrap: wrap; }
  .deadline-banner { flex-direction: column; align-items: flex-start; }
  .hero-glass { padding: var(--space-8) var(--space-6); }
  .hero-identity { gap: var(--space-3); }
  .hero-iit-logo { width: 64px; height: 64px; }
}

@media (max-width: 520px) {
  .why-grid { grid-template-columns: 1fr; }
  .research-grid { grid-template-columns: 1fr; }
  .faculty-grid { grid-template-columns: 1fr; }
  .campus-cards { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .apply-steps { flex-direction: column; align-items: center; }
  .hero-glass { padding: var(--space-6) var(--space-5); gap: var(--space-4); }
  .hero-title { font-size: clamp(1.8rem, 8vw, 2.4rem); }
}