:root {
  --bg: #070b11;
  --bg-2: #0a0f17;
  --panel: #0c141d;
  --panel-2: #101b26;
  --line: rgba(122, 162, 190, 0.14);
  --line-strong: rgba(122, 162, 190, 0.28);
  --text: #e9f1f8;
  --muted: #7c93a6;
  --dim: #4a6076;
  --accent: #5fd3f3;
  --accent-dim: rgba(95, 211, 243, 0.14);
  --radius: 2px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(1100px 620px at 78% -8%, rgba(38, 104, 148, 0.28), transparent 62%),
    radial-gradient(760px 520px at 6% 108%, rgba(24, 74, 104, 0.2), transparent 66%);
}

img { display: block; max-width: 100%; }

a { color: inherit; text-decoration: none; }

::selection { background: rgba(95, 211, 243, 0.28); }

.wrap {
  position: relative;
  z-index: 1;
  width: min(1220px, calc(100% - 96px));
  margin: 0 auto;
}

/* ---------- progress + nav ---------- */
.progress {
  position: fixed;
  top: 0; left: 0;
  height: 2px;
  width: 0;
  background: var(--accent);
  z-index: 60;
  transition: width 0.1s linear;
}

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 22px;
  padding: 16px 32px;
  backdrop-filter: blur(18px);
  background: linear-gradient(180deg, rgba(7, 11, 17, 0.9), rgba(7, 11, 17, 0.5));
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.nav.solid { border-bottom-color: var(--line); }

.nav .brand {
  font-size: 13px;
  letter-spacing: 0.22em;
  color: var(--text);
  font-weight: 600;
}

.nav .brand span { color: var(--dim); font-weight: 400; letter-spacing: 0.16em; }

.nav-links {
  display: flex;
  gap: 20px;
  margin-left: auto;
  overflow-x: auto;
  scrollbar-width: none;
}
.nav-links::-webkit-scrollbar { display: none; }

.nav-links a {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.08em;
  white-space: nowrap;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.nav-links a:hover, .nav-links a.on { color: var(--text); border-bottom-color: var(--accent); }

/* ---------- hero ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 120px 0 64px;
  overflow: hidden;
}

.hero-canvas {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.5;
  background-image:
    linear-gradient(rgba(120, 170, 200, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 170, 200, 0.05) 1px, transparent 1px);
  background-size: 96px 96px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 20%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 20%, transparent 78%);
}

.hero .wrap { position: relative; z-index: 1; }

.kicker {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 11px;
  letter-spacing: 0.32em;
  color: var(--accent);
  text-transform: uppercase;
}

.kicker::before {
  content: "";
  width: 42px;
  height: 1px;
  background: var(--accent);
  opacity: 0.6;
}

.hero h1 {
  margin: 26px 0 0;
  font-size: clamp(64px, 13vw, 168px);
  line-height: 0.92;
  letter-spacing: 0.02em;
  font-weight: 800;
}

.hero .role {
  margin: 22px 0 0;
  font-size: clamp(16px, 2vw, 22px);
  letter-spacing: 0.34em;
  color: var(--text);
  font-weight: 500;
}

.hero .lede {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: 15px;
  color: var(--muted);
  line-height: 1.85;
}

.hero .lede b { color: var(--text); font-weight: 600; }

.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin: 46px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.stats li {
  flex: 1 1 0;
  min-width: 140px;
  padding: 20px 24px 20px 0;
}

.stats li + li { padding-left: 24px; border-left: 1px solid var(--line); }

.stats .n {
  display: block;
  font-size: 34px;
  line-height: 1;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.stats .t {
  display: block;
  margin-top: 8px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--dim);
}

.hero-foot {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  margin-top: 52px;
  font-size: 12px;
  color: var(--dim);
  letter-spacing: 0.06em;
}

.hero-foot a:hover { color: var(--accent); }

.scroll-cue {
  position: absolute;
  left: 50%;
  bottom: 26px;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 10px;
  letter-spacing: 0.3em;
  color: var(--dim);
  z-index: 2;
}

.scroll-cue i {
  width: 1px;
  height: 42px;
  background: linear-gradient(180deg, var(--accent), transparent);
  animation: cue 2.4s var(--ease) infinite;
  transform-origin: top;
}

@keyframes cue {
  0%, 100% { transform: scaleY(0.3); opacity: 0.4; }
  50% { transform: scaleY(1); opacity: 1; }
}

/* ---------- sections ---------- */
.sec { padding: 96px 0 8px; }

.sec-head {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr) minmax(0, 1.1fr);
  gap: 32px;
  align-items: start;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--line);
}

.sec-no {
  font-size: 13px;
  letter-spacing: 0.22em;
  color: var(--accent);
  padding-top: 8px;
}

.sec-title {
  margin: 0;
  font-size: clamp(28px, 3.6vw, 44px);
  line-height: 1.14;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.sec-sub {
  margin: 10px 0 0;
  font-size: 13px;
  color: var(--dim);
  letter-spacing: 0.1em;
}

.sec-desc {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.9;
}

.sec-tools {
  display: flex;
  gap: 12px;
  margin-top: 18px;
}

.sec-grid {
  display: grid;
  gap: 20px;
  margin-top: 32px;
}

.sec-grid.cols-1 { grid-template-columns: minmax(0, 1fr); }
.sec-grid.cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.sec-grid.cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.sec-grid.cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* ---------- card ---------- */
.card {
  position: relative;
  display: block;
  width: 100%;
  padding: 0;
  border: 1px solid var(--line);
  background: var(--panel);
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.25s var(--ease), transform 0.35s var(--ease), background 0.25s var(--ease);
}

.card:hover { border-color: var(--line-strong); transform: translateY(-3px); background: var(--panel-2); }

.card:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.card .shot {
  position: relative;
  overflow: hidden;
  background: #0b1219;
  aspect-ratio: 16 / 9;
}

.card.portrait .shot { aspect-ratio: 3 / 4; }

.card .shot img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--ease), filter 0.4s var(--ease);
  filter: saturate(0.92) contrast(1.02);
}

.card:hover .shot img { transform: scale(1.045); filter: saturate(1.02) contrast(1.04); }

.card .shot::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7, 11, 17, 0) 42%, rgba(7, 11, 17, 0.72) 100%);
}

.badge {
  position: absolute;
  top: 10px; right: 10px;
  z-index: 2;
  padding: 3px 8px;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: #d9edf7;
  background: rgba(4, 9, 14, 0.82);
  border: 1px solid rgba(122, 162, 190, 0.2);
  backdrop-filter: blur(6px);
}

.play {
  position: absolute;
  left: 50%; top: 50%;
  z-index: 2;
  width: 46px; height: 46px;
  margin: -23px 0 0 -23px;
  border: 1px solid rgba(233, 241, 248, 0.5);
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: rgba(6, 12, 18, 0.42);
  backdrop-filter: blur(4px);
  transition: transform 0.3s var(--ease), background 0.3s var(--ease), border-color 0.3s var(--ease), opacity 0.3s var(--ease);
}

.play::before {
  content: "";
  margin-left: 3px;
  border-left: 11px solid var(--text);
  border-top: 7px solid transparent;
  border-bottom: 7px solid transparent;
}

.card:hover .play { transform: scale(1.08); background: var(--accent-dim); border-color: var(--accent); }

.card-body { padding: 15px 16px 17px; }

.card-title {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.card-meta {
  margin: 6px 0 0;
  font-size: 11.5px;
  color: var(--dim);
  letter-spacing: 0.08em;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.card-meta i { font-style: normal; color: var(--dim); opacity: 0.5; }

.card .tag {
  display: inline-block;
  margin-top: 9px;
  padding: 2px 7px;
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--accent);
  border: 1px solid rgba(95, 211, 243, 0.28);
  background: rgba(95, 211, 243, 0.06);
}

/* ---------- wide feature card ---------- */
.feature {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
}

.feature .shot { position: relative; aspect-ratio: 21 / 9; overflow: hidden; }
.feature .shot img { width: 100%; height: 100%; object-fit: cover; filter: saturate(0.9) contrast(1.03); }
.feature .body { padding: 26px 28px; display: flex; flex-direction: column; justify-content: center; }
.feature h3 { margin: 0; font-size: 22px; font-weight: 700; }
.feature p { margin: 12px 0 0; color: var(--muted); font-size: 13.5px; line-height: 1.9; }

.cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: 22px;
  padding: 10px 18px;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 12.5px;
  letter-spacing: 0.12em;
  cursor: pointer;
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease), color 0.25s var(--ease);
}

.cta:hover { border-color: var(--accent); color: var(--accent); background: rgba(95, 211, 243, 0.05); }

.cta::after { content: "→"; letter-spacing: 0; }

/* ---------- footer ---------- */
.foot {
  margin-top: 120px;
  padding: 72px 0 56px;
  border-top: 1px solid var(--line);
}

.foot h2 {
  margin: 0;
  font-size: clamp(30px, 5vw, 58px);
  line-height: 1.16;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.foot .sub { margin: 18px 0 0; color: var(--muted); font-size: 14px; }

.contact {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1px;
  margin-top: 44px;
  background: var(--line);
  border: 1px solid var(--line);
}

.contact div { background: var(--bg); padding: 20px 22px; }
.contact dt { font-size: 10.5px; letter-spacing: 0.2em; color: var(--dim); }
.contact dd { margin: 8px 0 0; font-size: 15px; letter-spacing: 0.02em; }
.contact dd a:hover { color: var(--accent); }

.copy {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  margin-top: 56px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-size: 11px;
  color: var(--dim);
  letter-spacing: 0.1em;
}

/* ---------- modal ---------- */
dialog.player {
  width: min(1180px, calc(100vw - 48px));
  padding: 0;
  border: 1px solid var(--line-strong);
  background: #05090e;
  color: var(--text);
  border-radius: 3px;
}

dialog.player::backdrop { background: rgba(3, 6, 10, 0.86); backdrop-filter: blur(6px); }

.player-inner { display: grid; grid-template-columns: minmax(0, 1fr) 268px; }

.player-stage { background: #000; display: flex; align-items: center; justify-content: center; min-height: 320px; }
.player-stage video { width: 100%; max-height: 76vh; background: #000; }

.player-side {
  padding: 22px;
  border-left: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.player-side h3 { margin: 0; font-size: 17px; }
.player-side p { margin: 0; color: var(--muted); font-size: 12.5px; line-height: 1.8; }

.player-nav { margin-top: auto; display: flex; gap: 8px; }

.player-nav button, .player-close {
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 12px;
  padding: 8px 12px;
  cursor: pointer;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.player-nav button:hover, .player-close:hover { border-color: var(--accent); color: var(--accent); }

.player-close { position: absolute; top: 10px; right: 10px; z-index: 3; background: rgba(5, 9, 14, 0.7); }

/* ---------- reveal ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .scroll-cue i { animation: none; }
  html { scroll-behavior: auto; }
}

/* ---------- responsive ---------- */
@media (max-width: 1024px) {
  .wrap { width: calc(100% - 56px); }
  .sec-head { grid-template-columns: 64px minmax(0, 1fr); }
  .sec-desc { grid-column: 2; }
  .sec-grid.cols-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .feature { grid-template-columns: 1fr; }
  .player-inner { grid-template-columns: 1fr; }
  .player-side { border-left: 0; border-top: 1px solid var(--line); }
}

@media (max-width: 680px) {
  .wrap { width: calc(100% - 36px); }
  .nav { padding: 12px 18px; gap: 12px; }
  .nav-links { gap: 14px; }
  .hero { padding-top: 96px; }
  .sec { padding-top: 68px; }
  .sec-head { grid-template-columns: 1fr; gap: 12px; }
  .sec-desc { grid-column: 1; }
  .sec-grid.cols-2, .sec-grid.cols-3, .sec-grid.cols-4 { grid-template-columns: 1fr; }
  .stats li { flex-basis: 50%; padding: 16px 12px 16px 0; }
  .stats li + li { padding-left: 16px; }
}

/* ---------- split layout ---------- */
.split {
  display: grid;
  grid-template-columns: minmax(0, 400px) minmax(0, 1fr);
  gap: 56px;
  align-items: center;
  margin-top: 36px;
}

.split-media .card { cursor: pointer; }

.split-copy h3 {
  margin: 0;
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 700;
  letter-spacing: 0.01em;
}

.split-copy p {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.95;
  max-width: 34em;
}

.split-list {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.split-list li {
  padding: 12px 0 12px 22px;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
  color: var(--text);
  letter-spacing: 0.04em;
  position: relative;
}

.split-list li::before {
  content: "";
  position: absolute;
  left: 0; top: 50%;
  width: 12px; height: 1px;
  background: var(--accent);
  opacity: 0.7;
}

/* ---------- hero figure ---------- */
.hero-figure {
  position: absolute;
  right: 0; top: 50%;
  transform: translateY(-50%);
  display: flex;
  gap: 14px;
  z-index: 1;
  pointer-events: none;
  mask-image: linear-gradient(180deg, transparent, #000 18%, #000 82%, transparent);
  -webkit-mask-image: linear-gradient(180deg, transparent, #000 18%, #000 82%, transparent);
}

.hero-figure img {
  width: 108px;
  height: 192px;
  object-fit: cover;
  opacity: 0.42;
  filter: saturate(0.75) contrast(1.05);
  border: 1px solid rgba(122, 162, 190, 0.18);
}

.hero-figure img:nth-child(2) { margin-top: -46px; opacity: 0.6; }
.hero-figure img:nth-child(3) { margin-top: 28px; opacity: 0.34; }

@media (max-width: 1180px) { .hero-figure { display: none; } }
@media (max-width: 1024px) {
  .split { grid-template-columns: 1fr; gap: 28px; }
  .split-media { max-width: 380px; }
}

/* main content gutter */
#main { width: min(1220px, calc(100% - 96px)); margin: 0 auto; }
@media (max-width: 1024px) { #main { width: calc(100% - 56px); } }
@media (max-width: 680px) { #main { width: calc(100% - 36px); } }

/* split tuning */
.split { align-items: start; grid-template-columns: minmax(0, 360px) minmax(0, 1fr); gap: 52px; }
.split-copy { padding-top: 6px; }
.sec-head { grid-template-columns: 92px minmax(0, 0.95fr) minmax(0, 1.05fr); gap: 40px; }

.feature .body .cta { align-self: flex-start; }
.feature .shot { cursor: pointer; }

.hero-figure { right: 8px; gap: 10px; }
.hero-figure img { width: 74px; height: 132px; opacity: 0.34; }
.hero-figure img:nth-child(2) { margin-top: -30px; opacity: 0.5; }
.hero-figure img:nth-child(3) { margin-top: 18px; opacity: 0.28; }

.hero-side {
  position: absolute;
  right: 34px;
  top: 50%;
  transform: translateY(-50%);
  writing-mode: vertical-rl;
  font-size: 11px;
  letter-spacing: 0.42em;
  color: var(--dim);
  opacity: 0.75;
}

@media (max-width: 1024px) { .hero-side { display: none; } }

.card.tall .shot { aspect-ratio: 9 / 16; }