/* =========================================================
   ComSci Landing Page — design tokens & layout
   Palette: ink navy + paper + terminal-lime signature accent
   Type: Space Grotesk (display) / Inter (body) / JetBrains Mono (data)
   ========================================================= */

:root {
  --ink: #0c1220;
  --ink-soft: #141b2e;
  --ink-line: rgba(247, 244, 236, 0.12);
  --paper: #ffffff;
  --paper-soft: #eef4ee;
  --paper-soft-2: #f5f7f3;
  --text: #10131a;
  --text-muted: #5b6472;
  --on-ink: #f3f5ef;
  --on-ink-muted: #a7b0c0;
  --accent: #c6ff3d;
  --accent-ink: #10230a;
  --accent-2: #4fd6e0;
  --danger: #ff6b57;
  --radius-lg: 22px;
  --radius-md: 14px;
  --radius-sm: 8px;
  --shadow-soft: 0 20px 45px -25px rgba(12, 18, 32, 0.35);
  --container: 1160px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body.home-body {
  margin: 0;
  background: var(--paper);
  color: var(--text);
  font-family: "Inter", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
}

.home-body h1, .home-body h2, .home-body h3, .home-body h4 {
  font-family: "Space Grotesk", "Inter", sans-serif;
  margin: 0;
  letter-spacing: -0.01em;
  color: inherit;
}

.mono {
  font-family: "JetBrains Mono", ui-monospace, monospace;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.eyebrow::before {
  content: "";
  width: 18px;
  height: 2px;
  background: var(--accent);
  display: inline-block;
}
.on-ink .eyebrow { color: var(--on-ink-muted); }

a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
img { max-width: 100%; display: block; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 24px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease, color 0.18s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn--accent {
  background: var(--accent);
  color: var(--accent-ink);
}
.btn--accent:hover { box-shadow: 0 14px 30px -12px rgba(198, 255, 61, 0.55); }
.btn--ghost-ink {
  background: transparent;
  border-color: var(--ink-line);
  color: var(--on-ink);
}
.btn--ghost-ink:hover { border-color: var(--accent); }
.btn--outline {
  background: transparent;
  border-color: rgba(16, 19, 26, 0.15);
  color: var(--text);
}
.btn--outline:hover { border-color: var(--ink); }

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(12, 18, 32, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--ink-line);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  gap: 20px;
}
.nav__brand {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--on-ink);
  flex-shrink: 0;
}
.nav__brand span { color: var(--accent); }
.nav__links {
  display: flex;
  gap: 30px;
  margin: 0 auto;
}
.nav__links a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--on-ink-muted);
  position: relative;
  padding: 6px 0;
}
.nav__links a:hover { color: var(--on-ink); }
.nav__links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 2px;
  background: var(--accent);
  transition: width 0.2s ease;
}
.nav__links a:hover::after { width: 100%; }
.nav__cta { flex-shrink: 0; }
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav__toggle span {
  width: 22px; height: 2px;
  background: var(--on-ink);
  border-radius: 2px;
}

/* ---------- Hero ---------- */
.hero {
  background: var(--ink);
  color: var(--on-ink);
  padding: 76px 0 0;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% auto auto;
  width: 520px; height: 520px;
  background: radial-gradient(circle, rgba(198,255,61,0.16), transparent 70%);
  pointer-events: none;
}
.hero__grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
  padding: 64px 0 56px;
  position: relative;
}
.hero__title {
  font-size: clamp(2.1rem, 4.2vw, 3.4rem);
  line-height: 1.12;
  margin: 18px 0 20px;
}
.hero__title em {
  font-style: normal;
  color: var(--accent);
}
.hero__desc {
  color: var(--on-ink-muted);
  font-size: 1.05rem;
  max-width: 46ch;
  margin-bottom: 30px;
}
.hero__actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 46px;
}

/* Terminal signature card */
.terminal {
  background: var(--ink-soft);
  border: 1px solid var(--ink-line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}
.terminal__bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--ink-line);
}
.terminal__dot { width: 10px; height: 10px; border-radius: 50%; }
.terminal__dot--r { background: #ff6b57; }
.terminal__dot--y { background: #ffd166; }
.terminal__dot--g { background: #6bffb0; }
.terminal__title {
  margin-left: 10px;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.72rem;
  color: var(--on-ink-muted);
}
.terminal__body {
  padding: 24px 22px 28px;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.88rem;
  min-height: 210px;
}
.terminal__line { display: flex; gap: 10px; margin-bottom: 6px; flex-wrap: wrap; }
.terminal__prompt { color: var(--accent); }
.terminal__cmd { color: var(--on-ink); }
.terminal__out { color: var(--on-ink-muted); padding-left: 20px; margin-bottom: 14px; }
.caret {
  display: inline-block;
  width: 8px; height: 1.1em;
  background: var(--accent);
  vertical-align: -2px;
  animation: blink 1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* Stats strip */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--ink-line);
  border-top: 1px solid var(--ink-line);
  position: relative;
}
.stats__item {
  background: var(--ink);
  padding: 26px 20px;
  text-align: center;
}
.stats__num {
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--accent);
}
.stats__label {
  font-size: 0.82rem;
  color: var(--on-ink-muted);
  margin-top: 4px;
}

/* ---------- Section shell ---------- */
section { padding: 96px 0; }
.section-head {
  max-width: 640px;
  margin-bottom: 48px;
}
.section-head h2 {
  font-size: clamp(1.7rem, 3vw, 2.3rem);
  margin: 14px 0 14px;
}
.section-head p { color: var(--text-muted); font-size: 1.02rem; }
.on-ink .section-head p { color: var(--on-ink-muted); }

/* ---------- About ---------- */
.about { background: var(--paper); }
.about__grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 60px;
  align-items: start;
}
.about__pillars {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 28px;
}
.pillar {
  border: 1px solid rgba(16,19,26,0.1);
  border-radius: var(--radius-md);
  padding: 18px;
}
.pillar h4 { font-size: 0.98rem; margin-bottom: 6px; }
.pillar p { font-size: 0.88rem; color: var(--text-muted); margin: 0; }

.feature-card {
  display: flex;
  gap: 16px;
  padding: 22px;
  border-radius: var(--radius-md);
  background: var(--paper-soft-2);
  margin-bottom: 14px;
}
.feature-card:last-child { margin-bottom: 0; }
.feature-card__icon {
  flex-shrink: 0;
  width: 44px; height: 44px;
  border-radius: 12px;
  background: var(--ink);
  color: var(--accent);
  display: flex; align-items: center; justify-content: center;
}
.feature-card h4 { font-size: 1rem; margin-bottom: 4px; }
.feature-card p { margin: 0; font-size: 0.9rem; color: var(--text-muted); }

/* ---------- Courses ---------- */
.courses { background: var(--paper-soft); }
.tabs {
  display: inline-flex;
  gap: 6px;
  background: var(--paper);
  padding: 6px;
  border-radius: 999px;
  border: 1px solid rgba(16,19,26,0.08);
  margin-bottom: 36px;
  flex-wrap: wrap;
}
.tabs button {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.82rem;
  padding: 10px 18px;
  border-radius: 999px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.18s ease;
}
.tabs button.is-active {
  background: var(--ink);
  color: var(--accent);
}
.tab-panel { display: none; }
.tab-panel.is-active { display: block; animation: fade-in 0.35s ease; }
@keyframes fade-in { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }

.course-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.course-card {
  background: var(--paper);
  border-radius: var(--radius-md);
  padding: 24px;
  border: 1px solid rgba(16,19,26,0.07);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.course-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-soft); }
.course-card__top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}
.badge {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.72rem;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--ink);
  color: var(--accent);
}
.badge--lab {
  background: rgba(79, 214, 224, 0.15);
  color: #1a7f86;
}
.course-card h4 { font-size: 1.02rem; margin-bottom: 6px; }
.course-card__en { font-size: 0.82rem; color: var(--text-muted); margin-bottom: 10px; }
.course-card p.desc { font-size: 0.88rem; color: var(--text-muted); margin: 0 0 14px; }
.course-card__credit { font-family: "JetBrains Mono", monospace; font-size: 0.8rem; color: var(--text-muted); }

/* ---------- Schedule ---------- */
.schedule { background: var(--paper); }
.schedule__panels { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.plan-card {
  border: 1px solid rgba(16,19,26,0.08);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.plan-card__head {
  padding: 16px 20px;
  background: var(--ink);
  color: var(--on-ink);
  font-family: "Space Grotesk", sans-serif;
  font-size: 0.98rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.plan-card__head span { font-family: "JetBrains Mono", monospace; font-size: 0.72rem; color: var(--on-ink-muted); }
table.plan-table { width: 100%; border-collapse: collapse; }
.plan-table th, .plan-table td {
  text-align: left;
  padding: 12px 20px;
  font-size: 0.88rem;
  border-top: 1px solid rgba(16,19,26,0.06);
}
.plan-table th { font-family: "JetBrains Mono", monospace; font-size: 0.7rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.06em; border-top: none; }
.plan-table td.code { font-family: "JetBrains Mono", monospace; color: var(--text-muted); white-space: nowrap; }
.tag {
  display: inline-block;
  font-size: 0.72rem;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--paper-soft-2);
  color: var(--text-muted);
}

/* ---------- Faculty ---------- */
.faculty { background: var(--ink); color: var(--on-ink); }
.faculty-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.faculty-card {
  background: var(--ink-soft);
  border: 1px solid var(--ink-line);
  border-radius: var(--radius-md);
  padding: 26px 22px;
  transition: transform 0.18s ease, border-color 0.18s ease;
}
.faculty-card:hover { transform: translateY(-4px); border-color: var(--accent); }
.avatar {
  width: 58px; height: 58px;
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--ink);
  margin-bottom: 18px;
}
.faculty-card h4 { font-size: 1.02rem; margin-bottom: 3px; }
.faculty-card .role { font-size: 0.82rem; color: var(--on-ink-muted); margin-bottom: 10px; }
.faculty-card .expertise {
  font-size: 0.78rem;
  color: var(--accent);
  font-family: "JetBrains Mono", monospace;
}

/* ---------- Contact ---------- */
.contact { background: var(--paper-soft); }
.contact__grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 40px;
  align-items: start;
}
.contact-info {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 24px;
}
.contact-info__item {
  display: flex;
  gap: 14px;
  padding: 18px;
  background: var(--paper);
  border-radius: var(--radius-md);
  border: 1px solid rgba(16,19,26,0.07);
}
.contact-info__icon {
  width: 40px; height: 40px;
  border-radius: 10px;
  background: var(--ink);
  color: var(--accent);
  flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
}
.contact-info__item h4 { font-size: 0.92rem; margin-bottom: 3px; }
.contact-info__item p { margin: 0; font-size: 0.88rem; color: var(--text-muted); }
.social-row { display: flex; gap: 10px; }
.social-row a {
  width: 42px; height: 42px;
  border-radius: 10px;
  background: var(--ink);
  color: var(--on-ink);
  display: flex; align-items: center; justify-content: center;
  transition: background 0.18s ease, color 0.18s ease;
}
.social-row a:hover { background: var(--accent); color: var(--accent-ink); }

.contact-form {
  background: var(--paper);
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid rgba(16,19,26,0.07);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 16px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field label { font-size: 0.82rem; color: var(--text-muted); }
.field input, .field textarea {
  font-family: inherit;
  font-size: 0.94rem;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(16,19,26,0.15);
  background: var(--paper-soft-2);
  resize: vertical;
}
.field input:focus, .field textarea:focus {
  outline: none;
  border-color: var(--ink);
}
.field--full { grid-column: 1 / -1; }
.form-note {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 12px;
}
.form-success {
  display: none;
  align-items: center;
  gap: 10px;
  background: rgba(198,255,61,0.18);
  color: #1f3d0a;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  margin-bottom: 16px;
}
.form-success.is-visible { display: flex; }

/* ---------- Footer ---------- */
.footer { background: var(--ink); color: var(--on-ink-muted); padding: 56px 0 26px; }
.footer__top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 36px;
  border-bottom: 1px solid var(--ink-line);
}
.footer__brand { font-family: "Space Grotesk", sans-serif; font-size: 1.2rem; color: var(--on-ink); margin-bottom: 10px; }
.footer__brand span { color: var(--accent); }
.footer h5 { font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--on-ink); margin-bottom: 16px; }
.footer ul li { margin-bottom: 10px; font-size: 0.9rem; }
.footer ul li a:hover { color: var(--accent); }
.footer__bottom {
  padding-top: 22px;
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- Reveal-on-scroll ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .hero__grid { grid-template-columns: 1fr; padding-top: 20px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .about__grid, .contact__grid { grid-template-columns: 1fr; }
  .course-grid { grid-template-columns: repeat(2, 1fr); }
  .faculty-grid { grid-template-columns: repeat(2, 1fr); }
  .schedule__panels { grid-template-columns: 1fr; }
  .footer__top { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .nav__links, .nav__cta { display: none; }
  .nav__links.is-open {
    display: flex;
    position: absolute;
    top: 76px; left: 0; right: 0;
    background: var(--ink);
    flex-direction: column;
    padding: 20px 24px;
    gap: 18px;
    border-bottom: 1px solid var(--ink-line);
  }
  .nav__toggle { display: flex; }
  section { padding: 64px 0; }
  .course-grid, .faculty-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer__top { grid-template-columns: 1fr; }
  .about__pillars { grid-template-columns: 1fr; }
}