/* ============================================================
   元宇宙 VR 影片製作 — 課程成果報告
   義守大學 電影與電視學系 ｜ X+AI 特色課程 114-2
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Bricolage+Grotesque:opsz,wght@12..96,400;12..96,600;12..96,800&family=Noto+Sans+TC:wght@300;400;500;700;900&family=DM+Mono:wght@400;500&display=swap');

:root {
  --bg:        #06070d;
  --bg-2:      #0a0c15;
  --surface:   #101320;
  --surface-2: #161a2b;
  --line:      rgba(140, 160, 220, 0.14);
  --line-2:    rgba(140, 160, 220, 0.28);
  --ink:       #eef3ff;
  --muted:     #98a0bd;
  --muted-2:   #6c7493;

  --cyan:   #34e3ff;
  --violet: #a986ff;
  --amber:  #ffb24d;
  --pink:   #ff5fa2;

  --glow-cyan:   rgba(52, 227, 255, 0.55);
  --glow-violet: rgba(169, 134, 255, 0.55);

  --maxw: 1180px;
  --font-display: 'Bricolage Grotesque', 'Noto Sans TC', sans-serif;
  --font-body: 'Noto Sans TC', 'Bricolage Grotesque', sans-serif;
  --font-mono: 'DM Mono', ui-monospace, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 84px; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* film grain + ambient glow overlay */
body::before {
  content: "";
  position: fixed; inset: 0;
  pointer-events: none; z-index: 1;
  background:
    radial-gradient(60% 50% at 12% 8%, rgba(52,227,255,0.10), transparent 60%),
    radial-gradient(55% 45% at 92% 4%, rgba(169,134,255,0.12), transparent 60%),
    radial-gradient(50% 40% at 80% 100%, rgba(255,95,162,0.07), transparent 60%);
}
body::after {
  content: "";
  position: fixed; inset: 0;
  pointer-events: none; z-index: 2; opacity: 0.045;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

::selection { background: var(--cyan); color: #04121a; }

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

.wrap { width: min(var(--maxw), 92vw); margin-inline: auto; }
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem; letter-spacing: 0.28em; text-transform: uppercase;
  color: var(--cyan); display: inline-flex; align-items: center; gap: 0.6em;
}
.eyebrow::before { content: ""; width: 26px; height: 1px; background: var(--cyan); opacity: 0.7; }

/* ============================ NAV ============================ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px max(4vw, 22px);
  background: rgba(6,7,13,0.55);
  backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid transparent;
  transition: border-color .3s, background .3s;
}
.nav.scrolled { border-bottom-color: var(--line); background: rgba(6,7,13,0.82); }
.nav__brand { display: flex; align-items: center; gap: 11px; font-family: var(--font-display); font-weight: 800; letter-spacing: -0.01em; }
.nav__brand .dot {
  width: 13px; height: 13px; border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, var(--cyan), var(--violet));
  box-shadow: 0 0 14px var(--glow-cyan); flex: none;
}
.nav__brand small { display: block; font-family: var(--font-mono); font-size: 0.6rem; letter-spacing: 0.2em; color: var(--muted-2); font-weight: 400; }
.nav__links { display: flex; gap: 4px; align-items: center; }
.nav__links a {
  font-size: 0.84rem; color: var(--muted); padding: 7px 13px; border-radius: 99px;
  transition: color .2s, background .2s;
}
.nav__links a:hover { color: var(--ink); background: rgba(255,255,255,0.05); }
.nav__toggle { display: none; background: none; border: 1px solid var(--line-2); color: var(--ink); border-radius: 10px; padding: 8px 11px; font-size: 1.1rem; cursor: pointer; }

/* ============================ HERO ============================ */
.hero {
  position: relative; z-index: 3;
  min-height: 100svh; display: flex; flex-direction: column; justify-content: center;
  padding: 120px 0 70px;
  overflow: hidden;
}
.hero__bg {
  position: absolute; inset: 0; z-index: -1;
  background-size: cover; background-position: center;
  opacity: 0.22; filter: saturate(115%) contrast(105%);
  mask-image: linear-gradient(to bottom, transparent, #000 22%, #000 60%, transparent);
}
.hero__grid {
  position: absolute; inset: 0; z-index: -1; opacity: 0.5;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(120% 80% at 50% 30%, #000, transparent 75%);
}
.hero__sphere {
  position: absolute; right: -6vw; top: 18%; width: 46vw; max-width: 640px; aspect-ratio: 1; z-index: -1;
  opacity: 0.5; animation: spin 60s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.hero h1 {
  font-family: var(--font-display); font-weight: 800;
  font-size: clamp(2.7rem, 8vw, 6.2rem); line-height: 0.98; letter-spacing: -0.025em;
  margin: 22px 0 0;
}
.hero h1 .l2 { display: block; }
.hero h1 .grad {
  background: linear-gradient(100deg, var(--cyan), var(--violet) 55%, var(--pink));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hero__sub { margin-top: 26px; max-width: 50ch; color: var(--muted); font-size: 1.06rem; }
.hero__meta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 34px; }
.chip {
  font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.04em;
  padding: 7px 14px; border: 1px solid var(--line-2); border-radius: 99px; color: var(--muted);
  display: inline-flex; align-items: center; gap: 8px;
}
.chip b { color: var(--ink); font-weight: 500; }
.hero__teachers { display: flex; gap: 26px; margin-top: 40px; flex-wrap: wrap; }
.teacher { display: flex; align-items: center; gap: 13px; }
.teacher .av {
  width: 46px; height: 46px; border-radius: 50%; flex: none;
  display: grid; place-items: center; font-family: var(--font-display); font-weight: 800; font-size: 1.2rem;
  border: 1px solid var(--line-2);
}
.teacher:nth-child(1) .av { background: radial-gradient(circle at 30% 25%, rgba(52,227,255,.3), transparent), var(--surface); color: var(--cyan); }
.teacher:nth-child(2) .av { background: radial-gradient(circle at 30% 25%, rgba(169,134,255,.3), transparent), var(--surface); color: var(--violet); }
.teacher span { display: block; font-size: 0.72rem; font-family: var(--font-mono); color: var(--muted-2); letter-spacing: 0.12em; }
.teacher b { font-weight: 500; font-size: 1.02rem; }

.scroll-cue { margin-top: 56px; font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.2em; color: var(--muted-2); display: flex; align-items: center; gap: 10px; }
.scroll-cue .bar { width: 1px; height: 34px; background: linear-gradient(var(--cyan), transparent); animation: cue 1.8s ease-in-out infinite; }
@keyframes cue { 0%,100%{ opacity:.3; transform: scaleY(.6) } 50%{ opacity:1; transform: scaleY(1) } }

/* ============================ SECTIONS ============================ */
section { position: relative; z-index: 3; }
.section { padding: 92px 0; }
.section-head { max-width: 62ch; margin-bottom: 46px; }
.section-head h2 {
  font-family: var(--font-display); font-weight: 800;
  font-size: clamp(1.9rem, 4.4vw, 3.1rem); line-height: 1.04; letter-spacing: -0.02em; margin: 16px 0 14px;
}
.section-head p { color: var(--muted); font-size: 1.04rem; }
.module-tag {
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.2em; text-transform: uppercase;
  padding: 5px 12px; border-radius: 6px; display: inline-block;
}
.tag-led { color: var(--cyan); background: rgba(52,227,255,0.10); border: 1px solid rgba(52,227,255,0.3); }
.tag-vr { color: var(--violet); background: rgba(169,134,255,0.10); border: 1px solid rgba(169,134,255,0.3); }
.tag-ai { color: var(--amber); background: rgba(255,178,77,0.10); border: 1px solid rgba(255,178,77,0.3); }

.divider { height: 1px; background: linear-gradient(90deg, transparent, var(--line-2), transparent); }

/* intro / about cards */
.modgrid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 10px; }
.modcard {
  background: linear-gradient(180deg, var(--surface), var(--bg-2));
  border: 1px solid var(--line); border-radius: 18px; padding: 26px 24px;
  position: relative; overflow: hidden; transition: transform .35s, border-color .35s;
}
.modcard:hover { transform: translateY(-5px); border-color: var(--line-2); }
.modcard .num { font-family: var(--font-mono); font-size: 0.78rem; color: var(--muted-2); letter-spacing: 0.1em; }
.modcard h3 { font-family: var(--font-display); font-weight: 800; font-size: 1.4rem; margin: 14px 0 10px; letter-spacing: -0.01em; }
.modcard p { color: var(--muted); font-size: 0.95rem; }
.modcard .glowline { position: absolute; left: 0; top: 0; height: 3px; width: 100%; }
.modcard:nth-child(1) .glowline { background: linear-gradient(90deg, var(--cyan), transparent); }
.modcard:nth-child(2) .glowline { background: linear-gradient(90deg, var(--amber), transparent); }
.modcard:nth-child(3) .glowline { background: linear-gradient(90deg, var(--violet), transparent); }

/* tool pills */
.tools { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 8px; }
.tool {
  background: var(--surface); border: 1px solid var(--line); border-radius: 14px;
  padding: 16px 18px; flex: 1 1 200px; min-width: 180px; transition: border-color .3s, transform .3s;
}
.tool:hover { border-color: var(--line-2); transform: translateY(-3px); }
.tool__logo { height: 28px; width: auto; display: block; margin-bottom: 14px; }
.tool .k { font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.15em; color: var(--cyan); text-transform: uppercase; }
.k-logo { height: 15px; width: auto; vertical-align: -3px; margin-right: 7px; }
.tool h4 { font-size: 1.08rem; font-weight: 700; margin: 7px 0 5px; }
.tool p { color: var(--muted); font-size: 0.86rem; line-height: 1.55; }

/* ============================ VIDEO CARDS ============================ */
.video-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.video-grid.single { grid-template-columns: 1fr; max-width: 880px; margin-inline: auto; }
.vcard {
  background: var(--surface); border: 1px solid var(--line); border-radius: 18px; overflow: hidden;
  transition: border-color .3s, transform .3s;
}
.vcard:hover { border-color: var(--line-2); transform: translateY(-4px); }
.lite-yt {
  position: relative; aspect-ratio: 16/9; cursor: pointer;
  background-size: cover; background-position: center; background-color: #000;
}
.lite-yt::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(6,7,13,0.05), rgba(6,7,13,0.55));
  transition: background .3s;
}
.lite-yt:hover::after { background: linear-gradient(180deg, rgba(6,7,13,0), rgba(6,7,13,0.3)); }
.lite-yt .play {
  position: absolute; inset: 0; margin: auto; width: 74px; height: 74px; z-index: 2;
  display: grid; place-items: center; border-radius: 50%;
  background: rgba(6,7,13,0.55); border: 1.5px solid rgba(255,255,255,0.6);
  backdrop-filter: blur(4px); transition: transform .3s, background .3s, border-color .3s;
}
.lite-yt:hover .play { transform: scale(1.1); background: var(--cyan); border-color: var(--cyan); }
.lite-yt .play svg { width: 26px; height: 26px; fill: #fff; margin-left: 4px; transition: fill .3s; }
.lite-yt:hover .play svg { fill: #04121a; }
.lite-yt iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; z-index: 3; }
.lite-yt .ext-hint {
  position: absolute; right: 14px; bottom: 14px; z-index: 2;
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.02em; color: var(--ink);
  background: rgba(6,7,13,0.62); border: 1px solid rgba(255,255,255,0.28); border-radius: 99px;
  padding: 7px 14px; backdrop-filter: blur(6px); transition: background .3s, border-color .3s;
}
.lite-yt:hover .ext-hint { background: var(--cyan); color: #04121a; border-color: var(--cyan); }
.vcard__body { padding: 17px 20px 20px; }
.vcard__body .k { font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.14em; color: var(--muted-2); }
.vcard__body h4 { font-size: 1.12rem; font-weight: 700; margin: 6px 0 6px; letter-spacing: -0.01em; }
.vcard__body p { color: var(--muted); font-size: 0.88rem; }
.badge-unlisted {
  display: inline-flex; align-items: center; gap: 6px; margin-top: 10px;
  font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.06em;
  color: var(--muted-2); border: 1px solid var(--line); border-radius: 99px; padding: 3px 10px;
}

/* ============================ INTERACTIVE TEACHING ============================ */
.feature-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.feature {
  position: relative; border: 1px solid var(--line); border-radius: 20px; overflow: hidden;
  background: linear-gradient(180deg, var(--surface), var(--bg-2)); min-height: 270px;
  display: flex; flex-direction: column; justify-content: flex-end; padding: 26px;
  transition: border-color .3s, transform .3s;
}
.feature:hover { border-color: var(--line-2); transform: translateY(-4px); }
.feature__art { position: absolute; inset: 0; z-index: 0; opacity: 0.85; }
.feature__art svg { width: 100%; height: 100%; }
.feature > * { position: relative; z-index: 1; }
.feature h4 { font-family: var(--font-display); font-weight: 800; font-size: 1.45rem; margin-bottom: 8px; letter-spacing: -0.01em; }
.feature p { color: var(--muted); font-size: 0.92rem; max-width: 38ch; }
.feature .open {
  margin-top: 16px; display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--font-mono); font-size: 0.78rem; color: var(--cyan); letter-spacing: 0.05em;
}
.feature .open svg { width: 15px; height: 15px; transition: transform .3s; }
.feature:hover .open svg { transform: translate(3px,-3px); }

/* ============================ GALLERY（固定四欄等高格狀）============================ */
.gallery, .gallery.feat { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.g-item {
  position: relative; border-radius: 12px; overflow: hidden; cursor: pointer;
  background: var(--surface-2); aspect-ratio: 4 / 3;
}
.g-item img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .5s, filter .4s; filter: saturate(0.92) brightness(0.9); }
.g-item::after { content: ""; position: absolute; inset: 0; box-shadow: inset 0 0 0 1px var(--line); border-radius: 12px; transition: box-shadow .3s; pointer-events: none; }
.g-item:hover img { transform: scale(1.05); filter: saturate(1.05) brightness(1); }
.g-item:hover::after { box-shadow: inset 0 0 0 1px var(--line-2); }
.g-date {
  position: absolute; left: 10px; bottom: 10px; z-index: 2;
  font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.06em; color: var(--ink);
  background: rgba(6,7,13,0.6); border: 1px solid var(--line); border-radius: 7px; padding: 3px 9px;
  backdrop-filter: blur(6px); opacity: 0; transform: translateY(4px); transition: opacity .25s, transform .25s;
}
.g-item:hover .g-date { opacity: 1; transform: none; }

/* date accordion */
.date-block { margin-bottom: 14px; border: 1px solid var(--line); border-radius: 16px; overflow: hidden; background: var(--bg-2); }
.date-head {
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  padding: 18px 22px; cursor: pointer; user-select: none; transition: background .25s;
}
.date-head:hover { background: var(--surface); }
.date-head .left { display: flex; align-items: baseline; gap: 16px; flex-wrap: wrap; }
.date-head .d { font-family: var(--font-display); font-weight: 800; font-size: 1.3rem; }
.date-head .d small { font-family: var(--font-mono); font-size: 0.7rem; color: var(--muted-2); margin-left: 8px; letter-spacing: 0.1em; }
.date-head .label { color: var(--muted); font-size: 0.9rem; }
.date-head .count { font-family: var(--font-mono); font-size: 0.72rem; color: var(--muted-2); }
.date-head .chev { transition: transform .3s; color: var(--muted); }
.date-block.open .chev { transform: rotate(180deg); }
.date-body { max-height: 0; overflow: hidden; transition: max-height .5s ease; }
.date-block.open .date-body { max-height: 4000px; }
.date-body .pad { padding: 0 16px 18px; }

/* ============================ LIGHTBOX ============================ */
.lb { position: fixed; inset: 0; z-index: 200; background: rgba(4,5,10,0.94); backdrop-filter: blur(8px); display: none; align-items: center; justify-content: center; }
.lb.on { display: flex; }
.lb img { max-width: 92vw; max-height: 86vh; border-radius: 8px; box-shadow: 0 30px 120px rgba(0,0,0,0.7); }
.lb__close, .lb__nav { position: absolute; background: rgba(255,255,255,0.07); border: 1px solid var(--line-2); color: #fff; cursor: pointer; border-radius: 50%; display: grid; place-items: center; transition: background .2s; }
.lb__close { top: 22px; right: 22px; width: 46px; height: 46px; font-size: 1.3rem; }
.lb__nav { top: 50%; transform: translateY(-50%); width: 52px; height: 52px; font-size: 1.6rem; }
.lb__nav.prev { left: 18px; } .lb__nav.next { right: 18px; }
.lb__close:hover, .lb__nav:hover { background: var(--cyan); color: #04121a; }
.lb__count { position: absolute; bottom: 22px; left: 50%; transform: translateX(-50%); font-family: var(--font-mono); font-size: 0.8rem; color: var(--muted); }

/* ============================ GAME ============================ */
.game {
  border: 1px solid var(--line); border-radius: 22px; overflow: hidden;
  background:
    radial-gradient(60% 90% at 85% 10%, rgba(255,95,162,0.10), transparent 60%),
    radial-gradient(60% 90% at 10% 90%, rgba(52,227,255,0.10), transparent 60%),
    var(--surface);
  display: grid; grid-template-columns: 1.1fr 1fr; gap: 0; align-items: stretch;
}
.game__text { padding: 44px; }
.game__text h3 { font-family: var(--font-display); font-weight: 800; font-size: 1.9rem; letter-spacing: -0.02em; margin: 14px 0 14px; }
.game__text p { color: var(--muted); margin-bottom: 14px; }
.game__stack { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.game__stack span { font-family: var(--font-mono); font-size: 0.7rem; padding: 5px 11px; border: 1px solid var(--line-2); border-radius: 7px; color: var(--muted); }
.game__art { position: relative; min-height: 320px; overflow: hidden; }
.game__art svg { position: absolute; inset: 0; width: 100%; height: 100%; }

/* ============================ FOOTER ============================ */
.foot { position: relative; z-index: 3; border-top: 1px solid var(--line); padding: 60px 0 40px; margin-top: 40px; }
.foot__grid { display: flex; justify-content: space-between; gap: 30px; flex-wrap: wrap; align-items: flex-start; }
.foot__brand { font-family: var(--font-display); font-weight: 800; font-size: 1.5rem; }
.foot__brand small { display: block; font-family: var(--font-mono); font-size: 0.7rem; color: var(--muted-2); letter-spacing: 0.1em; margin-top: 6px; font-weight: 400; }
.foot a.btn-isu {
  display: inline-flex; align-items: center; gap: 10px; padding: 13px 22px; border-radius: 12px;
  border: 1px solid var(--line-2); font-family: var(--font-mono); font-size: 0.84rem; letter-spacing: 0.04em;
  transition: background .25s, color .25s, border-color .25s;
}
.foot a.btn-isu:hover { background: var(--cyan); color: #04121a; border-color: var(--cyan); }
.foot__links { display: flex; flex-direction: column; gap: 9px; }
.foot__links a { color: var(--muted); font-size: 0.9rem; transition: color .2s; }
.foot__links a:hover { color: var(--ink); }
.foot__copy { margin-top: 44px; color: var(--muted-2); font-size: 0.78rem; font-family: var(--font-mono); letter-spacing: 0.03em; }

/* doc links */
.docs { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 8px; }
.doclink {
  display: inline-flex; align-items: center; gap: 11px; padding: 13px 18px;
  background: var(--surface); border: 1px solid var(--line); border-radius: 12px; transition: border-color .25s, transform .25s;
}
.doclink:hover { border-color: var(--line-2); transform: translateY(-2px); }
.doclink .ic { width: 30px; height: 30px; border-radius: 8px; display: grid; place-items: center; background: rgba(52,227,255,0.12); color: var(--cyan); font-family: var(--font-mono); font-size: 0.6rem; font-weight: 500; flex: none; }
.doclink b { font-weight: 500; font-size: 0.92rem; }
.doclink span { display: block; font-family: var(--font-mono); font-size: 0.66rem; color: var(--muted-2); }

/* ============================ REVEAL ANIM ============================ */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .8s cubic-bezier(.2,.7,.2,1), transform .8s cubic-bezier(.2,.7,.2,1); }
.reveal.in { opacity: 1; transform: none; }
.reveal[data-d="1"] { transition-delay: .08s; }
.reveal[data-d="2"] { transition-delay: .16s; }
.reveal[data-d="3"] { transition-delay: .24s; }
.reveal[data-d="4"] { transition-delay: .32s; }

/* ============================ RESPONSIVE ============================ */
@media (max-width: 900px) {
  .modgrid, .video-grid, .feature-2 { grid-template-columns: 1fr; }
  .game { grid-template-columns: 1fr; }
  .game__art { min-height: 220px; order: -1; }
  .nav__links { display: none; position: absolute; top: 100%; right: 12px; left: 12px; flex-direction: column; align-items: stretch; gap: 2px; background: rgba(10,12,21,0.97); border: 1px solid var(--line-2); border-radius: 14px; padding: 10px; backdrop-filter: blur(14px); }
  .nav__links.open { display: flex; }
  .nav__links a { padding: 11px 14px; }
  .nav__toggle { display: block; }
  .gallery, .gallery.feat { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 540px) {
  .section { padding: 64px 0; }
  .hero { padding-top: 100px; }
  .gallery, .gallery.feat { grid-template-columns: repeat(2, 1fr); gap: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; }
}