/* ============================================================
   ACCESS Award — Premium Academic Design System
   Inspired by MIT, Vercel, and Next.js aesthetic
   ============================================================ */

/* ── Tokens ──────────────────────────────────────────────── */
:root {
  --color-fg:        #111111;
  --color-fg-muted:  #666666;
  --color-fg-faint:  #999999;
  --color-bg:        #ffffff;
  --color-bg-muted:  #fafafa;
  --color-border:    #eaeaea;
  --color-accent:    #a51c30;         /* MIT crimson-inspired accent */
  --color-dark:      #111111;
  --color-dark-fg:   #ededed;
  --color-dark-sub:  #a0a0a0;

  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --tracking-tight:  -0.02em;
  --tracking-tighter:-0.035em;

  --max-w:  1080px;
  --gutter: clamp(1rem, 4vw, 2.5rem);
  --section-y: clamp(3rem, 6vw, 5rem);
  --radius: 6px;
}

/* ── Reset ───────────────────────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.65;
  color: var(--color-fg);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
img { display: block; max-width: 100%; height: auto; }
button { font: inherit; cursor: pointer; }
strong { font-weight: 600; }
.text-center { text-align: center; }

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section {
  padding: var(--section-y) 0;
}

.bg-muted { background: var(--color-bg-muted); }

.bg-dark {
  background: var(--color-dark);
  color: var(--color-dark-fg);
}

.bg-green-tint {
  background: #f0faf4;
}

/* ── Header (Floating Pill) ───────────────────────────────── */
.header {
  position: fixed;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  width: calc(100% - 2rem);
  max-width: 1320px;
  background: rgba(255,255,255,.82);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  transition: box-shadow .3s, top .3s;
}
.header.scrolled {
  box-shadow: 0 4px 24px rgba(0,0,0,.06);
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: 72px;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.header-logo { flex-shrink: 0; }
.logo-img { height: 68px; }

.nav {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-close {
  display: none;
}

/* Mobile Nav Overlay */
.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 90; /* below header */
  opacity: 0;
  visibility: hidden;
  transition: .3s;
}
.nav-overlay.active {
  opacity: 1;
  visibility: visible;
}

.nav-link {
  font-size: 14.5px;
  font-weight: 500;
  letter-spacing: var(--tracking-tight);
  color: var(--color-fg);
  transition: color .15s;
  white-space: nowrap;
}
.nav-link:hover { color: var(--color-fg); }

.header-right {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-left: auto;
}

.btn-register {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  padding: 6px 16px;
  border-radius: 999px;
  background: var(--color-fg);
  color: var(--color-bg);
  transition: opacity .15s;
}
.btn-register:hover { opacity: .85; }

.logo-iitb { height: 44px; }

.hamburger {
  display: none;
  background: none;
  border: none;
  width: 24px;
  height: 20px;
  position: relative;
}
.hamburger span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--color-fg);
  border-radius: 2px;
  position: absolute;
  left: 0;
  transition: .25s;
}
.hamburger span:first-child { top: 2px; }
.hamburger span:last-child  { bottom: 2px; }
.hamburger.active span:first-child { top: 50%; transform: translateY(-50%) rotate(45deg); }
.hamburger.active span:last-child  { bottom: 50%; transform: translateY(50%) rotate(-45deg); }

/* Tagline inside header */
.header-tagline {
  text-align: center;
  padding: 6px var(--gutter);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  color: var(--color-accent);
  border-top: 1px solid rgba(0,0,0,.05);
}

/* ── Hero Slider ─────────────────────────────────────────── */
.hero {
  width: 100%;
  margin-top: 100px;
  padding: 1rem;
  display: flex;
  justify-content: center;
  background: var(--color-bg);
}

.slider {
  width: 100%;
  max-width: 1320px;
  aspect-ratio: 16 / 7;
  max-height: 75vh;
  min-height: 400px;
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 10px 40px rgba(0,0,0,0.08);
  background: var(--color-bg-muted);
}

.slide {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  opacity: 0;
  transition: opacity 1s ease-in-out;
}

.slide.active {
  opacity: 1;
}

.slider-dots {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 2;
}

.slider-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(0,0,0,.15);
  border: none;
  cursor: pointer;
  padding: 0;
  transition: all .3s;
}

.slider-dot.active {
  background: rgba(0,0,0,.6);
  width: 24px;
  border-radius: 4px;
}

/* ── Typography ──────────────────────────────────────────── */
.section-label {
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: #1a1a2e;
  margin-bottom: 1.25rem;
}
.section-label.light {
  color: var(--color-dark-sub);
}

.heading-lg {
  font-size: clamp(1.4rem, 2.5vw, 1.75rem);
  font-weight: 700;
  letter-spacing: var(--tracking-tighter);
  line-height: 1.3;
  margin-bottom: .75rem;
}

.heading-quote {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--color-fg-muted);
  letter-spacing: var(--tracking-tight);
  margin-bottom: 2rem;
}

.sub-heading {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  margin-bottom: 1rem;
}

/* ── Prose (body text) ───────────────────────────────────── */
.prose {
  max-width: 720px;
}
.prose p { margin-bottom: 1rem; }
.prose strong { color: var(--color-fg); }
.prose ul {
  list-style: disc;
  padding-left: 1.75rem;
  margin-bottom: 1rem;
}
.prose ul li { margin-bottom: .35rem; }
.prose.narrow { max-width: 700px; text-align: justify; }

.inline-cta {
  font-weight: 600;
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-accent);
  transition: opacity .15s;
}
.inline-cta:hover { opacity: .7; }

/* ── Donors ──────────────────────────────────────────────── */
.donors-row {
  display: flex;
  gap: 3rem;
  margin-bottom: 2.5rem;
}

.donor {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.donor-photo {
  width: 88px;
  height: 88px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--color-border);
}

.donor figcaption {
  display: flex;
  flex-direction: column;
}
.donor figcaption strong {
  font-size: .95rem;
  letter-spacing: var(--tracking-tight);
}
.donor figcaption span {
  font-size: .8rem;
  color: var(--color-fg-muted);
}

/* ── Prizes ──────────────────────────────────────────────── */
.prizes-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.prize-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.prize-card-header {
  background: var(--color-dark);
  color: var(--color-dark-fg);
  padding: 1.25rem 1.5rem;
}
.prize-card-header h3 {
  font-size: .7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--color-dark-sub);
  margin-bottom: .25rem;
}
.prize-card-header p {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
}

.prize-table {
  width: 100%;
  border-collapse: collapse;
}
.prize-table tr { border-bottom: 1px solid var(--color-border); }
.prize-table tr:last-child { border-bottom: none; }
.prize-table td {
  padding: 1rem 1.5rem;
  font-size: .9rem;
}
.rank {
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  color: var(--color-fg);
  width: 40%;
}
.rank-1 { color: var(--color-fg); }
.amount {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: var(--tracking-tight);
  text-align: right;
}

.extras-row {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-bottom: 1.5rem;
}

.extra-chip {
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  padding: 8px 16px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-fg);
}

.footnote {
  font-size: .85rem;
  color: var(--color-fg);
  max-width: 720px;
  line-height: 1.5;
}

/* ── How It Works (Steps) ────────────────────────────────── */
.steps-track {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 1px;
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius);
  overflow: hidden;
}

.step {
  padding: 2rem 1rem;
  text-align: center;
  background: rgba(255,255,255,.04);
  border-right: 1px solid rgba(255,255,255,.08);
  transition: background .2s;
}
.step:last-child { border-right: none; }
.step:hover { background: rgba(255,255,255,.08); }

.step-num {
  display: block;
  font-size: .7rem;
  font-weight: 600;
  letter-spacing: .12em;
  color: var(--color-dark-sub);
  margin-bottom: .75rem;
}

.step-label {
  display: block;
  font-size: .85rem;
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
}

/* ── Themes ──────────────────────────────────────────────── */
.themes-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.theme-panel {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
}

.theme-panel h3 {
  font-size: .75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--color-fg);
  margin-bottom: .25rem;
}

.theme-panel h4 {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  padding-bottom: 1rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
}

.theme-panel ul {
  list-style: disc;
  padding-left: 1.5rem;
}
.theme-panel li {
  font-size: .95rem;
  font-weight: 500;
  margin-bottom: .4rem;
  color: var(--color-fg);
}

/* ── Eligibility ─────────────────────────────────────────── */
.criteria-list {
  list-style: disc;
  padding-left: 1.75rem;
  max-width: 720px;
}
.criteria-list li {
  margin-bottom: .5rem;
}

/* ── Timeline ────────────────────────────────────────────── */
.timeline-track {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.tl-item {
  padding: 2rem 1.5rem;
  border-right: 1px solid var(--color-border);
  transition: background .15s;
}
.tl-item:last-child { border-right: none; }
.tl-item:hover { background: rgba(0,0,0,.015); }

.tl-item time {
  display: block;
  font-size: .7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--color-accent);
  margin-bottom: .5rem;
}

.tl-item p {
  font-size: .9rem;
  font-weight: 500;
  letter-spacing: var(--tracking-tight);
}

.tl-item.active {
  background: var(--color-bg-muted);
}

/* ── Docs / Terms ────────────────────────────────────────── */
.docs-row {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

.doc-link {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-size: .9rem;
  font-weight: 500;
  letter-spacing: var(--tracking-tight);
  padding: 10px 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-fg);
  transition: border-color .15s, box-shadow .15s;
}
.doc-link:hover {
  border-color: var(--color-fg-muted);
  box-shadow: 0 2px 8px rgba(0,0,0,.04);
}
.doc-icon {
  font-size: .85rem;
  color: var(--color-fg-faint);
}

/* ── ACCESS 2024 / Winners ───────────────────────────────── */
.access-24-link {
  display: inline-block;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: var(--tracking-tighter);
  color: var(--color-fg);
  margin-bottom: 2rem;
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: 4px;
  transition: opacity .15s;
}
.access-24-link:hover { opacity: .7; }

.winners-img {
  max-width: 100%;
  margin: 0 auto;
  border-radius: var(--radius);
}

/* Winners Grid */
.winners-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
  gap: 2rem;
}

.winner-block {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow .2s;
}
.winner-block:hover {
  box-shadow: 0 4px 16px rgba(0,0,0,.06);
}

.winner-year {
  font-family: var(--font);
  font-size: .65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--color-dark-sub);
  background: var(--color-dark);
  padding: 10px 1.5rem;
}

.winner-link {
  display: block;
}

.winner-link .winners-img {
  width: 100%;
  border-radius: 0;
}

.winner-caption {
  display: block;
  padding: 1rem 1.5rem;
  font-size: .9rem;
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  color: var(--color-fg);
  border-top: 1px solid var(--color-border);
  transition: color .15s;
}
.winner-link:hover .winner-caption {
  color: var(--color-accent);
}

/* ── Footer ──────────────────────────────────────────────── */
.footer {
  background: var(--color-dark);
  color: var(--color-dark-sub);
  font-size: .85rem;
  padding-top: 3rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 3rem;
}

.footer-col a {
  color: var(--color-dark-fg);
  transition: opacity .15s;
}
.footer-col a:hover { opacity: .7; }
.footer-col p { margin-bottom: .35rem; }

.footer-bottom {
  margin-top: 2rem;
  padding: 1.5rem 0;
  border-top: 1px solid rgba(255,255,255,.1);
  font-size: .75rem;
  color: var(--color-fg-faint);
}

/* ── Modal ───────────────────────────────────────────────── */
.overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0,0,0,.5);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: .2s;
}
.overlay.active { opacity: 1; visibility: visible; }

.modal {
  background: var(--color-bg);
  border-radius: 8px;
  width: 90%;
  max-width: 640px;
  max-height: 85vh;
  overflow-y: auto;
  padding: 2.5rem;
  position: relative;
  transform: translateY(10px);
  transition: transform .25s;
}
.overlay.active .modal { transform: translateY(0); }

.modal h3 {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: var(--tracking-tighter);
  margin-bottom: 1.5rem;
}

.modal h4 {
  font-size: .85rem;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: .5rem;
}
.modal h4:first-of-type { margin-top: 0; }

.modal ol {
  padding-left: 1.5rem;
  list-style: decimal;
}
.modal li {
  font-size: .9rem;
  margin-bottom: .5rem;
  color: var(--color-fg-muted);
}

.modal p {
  font-size: .9rem;
  color: var(--color-fg-muted);
}
.modal a {
  color: var(--color-accent);
  font-weight: 600;
  border-bottom: 1px solid var(--color-accent);
}

.modal-x {
  position: absolute;
  top: 1.25rem;
  right: 1.5rem;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--color-fg-faint);
  transition: color .15s;
}
.modal-x:hover { color: var(--color-fg); }

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 1100px) {
  .nav { gap: 1rem; }
  .nav-link { font-size: 13.5px; }
}

@media (max-width: 900px) {
  .hamburger { display: block; }

  .header {
    border-radius: 12px;
  }

  .nav {
    position: absolute;
    top: -12px;
    right: -100vw;
    width: 280px;
    height: 100vh;
    height: 100dvh;
    background: var(--color-bg);
    border: none;
    border-left: 1px solid var(--color-border);
    border-radius: 0;
    box-shadow: -10px 0 40px rgba(0,0,0,.15);
    z-index: 200;
    transition: right .35s cubic-bezier(0.16, 1, 0.3, 1);
  }
  .nav.open { 
    right: -1rem; /* Adjusts for header margin */
  }
  .nav-links {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-top: 60px;
  }
  .nav-link {
    display: block;
    padding: 16px 24px;
    border-bottom: 1px solid var(--color-border);
    font-size: 16px;
  }
  
  .nav-close {
    display: block;
    position: absolute;
    top: 16px;
    right: 24px;
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--color-fg-muted);
    cursor: pointer;
  }


  .header-logo-right { display: none; }

  .prizes-grid,
  .themes-row {
    grid-template-columns: 1fr;
  }

  .timeline-track {
    grid-template-columns: 1fr 1fr;
  }

  .steps-track {
    grid-template-columns: repeat(3, 1fr);
  }

  .donors-row {
    flex-direction: column;
    gap: 1.5rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .hero {
    margin-top: 90px;
    padding: 0.5rem;
  }
  
  .slider {
    aspect-ratio: 4 / 3;
    min-height: 350px;
    border-radius: 12px;
  }

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

@media (max-width: 600px) {
  .header {
    top: 6px;
    width: calc(100% - 1rem);
    border-radius: 10px;
  }
  
  .nav { top: -6px; }
  .nav.open { right: -0.5rem; }

  .header-inner {
    height: 60px;
    padding: 0 1rem;
    gap: 0.75rem;
  }

  .logo-img { height: 56px; }
  .btn-register { font-size: 12px; padding: 5px 12px; }
  .header-tagline { font-size: 10px; padding: 5px 1rem; }

  .hero {
    margin-top: 80px;
    padding: 0.5rem;
  }

  .slider {
    aspect-ratio: 1 / 1;
    min-height: 300px;
    border-radius: 10px;
  }

  .steps-track {
    grid-template-columns: 1fr 1fr;
  }

  .timeline-track {
    grid-template-columns: 1fr;
  }

  .extras-row {
    flex-direction: column;
  }

  .step {
    padding: 1.25rem .75rem;
  }

  .donor-photo {
    width: 64px;
    height: 64px;
  }

  .modal {
    padding: 1.5rem;
  }

  .section {
    padding: clamp(2rem, 5vw, 3rem) 0;
  }
}

@media (max-width: 400px) {
  .steps-track {
    grid-template-columns: 1fr;
  }

  .prize-table td {
    padding: .75rem 1rem;
  }

  .amount {
    font-size: .9rem;
  }
}