:root {
  --bg: #091014;
  --panel: #101b20;
  --panel-2: #14242a;
  --text: #f4f3ed;
  --muted: #95a9ac;
  --line: rgba(255,255,255,.12);
  --accent: #69d3c1;
  --accent-soft: rgba(105,211,193,.14);
  --gold: #e6be73;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: Inter, "Segoe UI", "Microsoft YaHei", sans-serif;
}
body::before {
  content: "";
  position: fixed;
  z-index: -1;
  inset: 0;
  background:
    radial-gradient(circle at 78% 8%, rgba(105,211,193,.09), transparent 30%),
    radial-gradient(circle at 15% 45%, rgba(230,190,115,.05), transparent 25%);
  pointer-events: none;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
p { line-height: 1.75; }
button { font: inherit; }

.section-shell {
  width: min(1180px, calc(100% - 64px));
  margin: 0 auto;
}

.lingnian-hero {
  position: relative;
  display: grid;
  grid-template-columns: .88fr 1.12fr;
  gap: 70px;
  min-height: 900px;
  padding: 150px max(40px, calc((100vw - 1240px) / 2)) 90px;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}
.hero-atmosphere {
  position: absolute;
  right: -180px;
  top: 70px;
  width: 760px;
  height: 760px;
  border: 1px solid rgba(105,211,193,.18);
  border-radius: 50%;
  box-shadow:
    0 0 0 90px rgba(105,211,193,.025),
    0 0 0 180px rgba(230,190,115,.018);
}
.hero-copy { position: relative; z-index: 2; align-self: center; }
.hero-kicker, .section-index {
  margin: 0 0 22px;
  color: var(--accent);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: .18em;
}
.hero-copy h1 {
  margin: 0;
  font-size: clamp(50px, 4.25vw, 68px);
  line-height: .96;
  letter-spacing: -.065em;
}
.hero-copy h1 span { white-space: nowrap; }
.hero-line-primary { color: var(--text); }
.hero-line-secondary { color: rgba(255,255,255,.36); }
.hero-summary {
  max-width: 600px;
  margin: 34px 0 42px;
  color: rgba(255,255,255,.68);
  font-size: 18px;
}
.hero-meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 1px solid var(--line);
}
.hero-meta div { padding: 20px 20px 20px 0; border-bottom: 1px solid var(--line); }
.hero-meta small, .hero-meta strong { display: block; }
.hero-meta small { margin-bottom: 7px; color: var(--accent); font-size: 8px; font-weight: 900; letter-spacing: .15em; }
.hero-meta strong { font-size: 12px; }
.hero-visual {
  position: relative;
  z-index: 2;
  min-height: 620px;
  align-self: center;
}
.hero-shot {
  position: absolute;
  padding: 0;
  overflow: hidden;
  color: white;
  border: 5px solid #1b2b31;
  border-radius: 22px;
  background: #0a0f12;
  box-shadow: 0 38px 90px rgba(0,0,0,.55);
  cursor: zoom-in;
}
.hero-shot img { width: 100%; aspect-ratio: 2.16; object-fit: cover; }
.hero-shot span {
  display: block;
  padding: 12px 15px;
  color: rgba(255,255,255,.55);
  font-size: 9px;
  font-weight: 900;
  letter-spacing: .16em;
  text-align: left;
}
.shot-overview { width: 88%; top: 42px; right: 0; transform: rotate(2.6deg); opacity: .8; }
.shot-embed { width: 94%; left: 0; bottom: 58px; transform: rotate(-2deg); }
.hero-status {
  position: absolute;
  right: max(40px, calc((100vw - 1240px) / 2));
  bottom: 38px;
  margin: 0;
  color: rgba(255,255,255,.36);
  font-size: 9px;
  font-weight: 900;
  letter-spacing: .18em;
}

.case-section { padding: 120px 0; border-bottom: 1px solid var(--line); }
.split-layout, .reflection-layout {
  display: grid;
  grid-template-columns: .92fr 1.08fr;
  gap: 90px;
  align-items: center;
}
.section-copy h2, .section-heading h2, .solution-intro h2, .reflection-copy h2 {
  margin: 0;
  font-size: clamp(42px, 4.7vw, 68px);
  line-height: 1;
  letter-spacing: -.055em;
}
.section-copy > p:not(.section-index), .section-heading > p, .reflection-copy > p:not(.section-index) {
  color: var(--muted);
  font-size: 16px;
}
blockquote {
  margin: 34px 0 0;
  padding: 4px 0 4px 24px;
  border-left: 3px solid var(--accent);
  color: white;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.65;
}
.section-heading {
  display: grid;
  grid-template-columns: 1.25fr .75fr;
  gap: 80px;
  align-items: end;
  margin-bottom: 64px;
}

.context-section { background: linear-gradient(180deg, #0c1519, #091014); }
.complexity-model {
  position: relative;
  min-height: 500px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(105,211,193,.1), transparent 52%);
}
.model-core {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 190px;
  height: 190px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(105,211,193,.46);
  border-radius: 50%;
  background: #0b171b;
  transform: translate(-50%,-50%);
  text-align: center;
}
.model-core small { color: var(--accent); font-size: 8px; font-weight: 900; letter-spacing: .16em; }
.model-core strong { margin-top: 12px; font-size: 17px; line-height: 1.45; }
.model-orbit {
  position: absolute;
  padding: 10px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(16,27,32,.92);
  color: rgba(255,255,255,.76);
  font-size: 11px;
  font-weight: 800;
}
.orbit-a { top: 8%; left: 39%; }
.orbit-b { top: 35%; left: 6%; }
.orbit-c { top: 35%; right: 5%; }
.orbit-d { bottom: 12%; left: 20%; }
.orbit-e { bottom: 12%; right: 12%; }

.diagnosis-section { background: #0b1317; }
.diagnosis-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.diagnosis-card {
  min-height: 300px;
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: linear-gradient(145deg, rgba(255,255,255,.035), transparent);
}
.diagnosis-card > span { color: var(--accent); font-size: 12px; font-weight: 900; letter-spacing: .16em; }
.diagnosis-card h3 { margin: 62px 0 14px; font-size: 25px; letter-spacing: -.03em; }
.diagnosis-card p { color: var(--muted); font-size: 14px; }
.diagnosis-card strong { display: block; margin-top: 24px; color: var(--gold); font-size: 12px; }
.before-evidence {
  display: grid;
  grid-template-columns: .7fr 1.3fr;
  gap: 48px;
  align-items: center;
  margin-top: 76px;
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: 26px;
  background: #0e191e;
}
.before-copy small, .ia-board small, .priority-label small, .interaction-sequence small,
.contribution-strip small {
  color: var(--accent);
  font-size: 9px;
  font-weight: 900;
  letter-spacing: .16em;
}
.before-copy h3 { margin: 16px 0; font-size: 27px; line-height: 1.15; }
.before-copy p { color: var(--muted); font-size: 14px; }
.before-images { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.before-images button, .decision-media button, .sequence-grid button, .iteration-card button,
.single-media {
  padding: 0;
  overflow: hidden;
  border: 0;
  border-radius: 15px;
  background: #080c0e;
  cursor: zoom-in;
}
.before-images img { width: 100%; height: 230px; object-fit: cover; }

.architecture-section { background: linear-gradient(180deg, #091014, #0d171b); }
.ia-board {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 18px;
  align-items: stretch;
}
.ia-board article {
  min-height: 320px;
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: linear-gradient(160deg, rgba(105,211,193,.08), rgba(255,255,255,.02));
}
.ia-board h3 { margin: 46px 0 24px; font-size: 28px; }
.ia-board ul, .decision-copy ul { padding: 0; list-style: none; }
.ia-board li, .decision-copy li {
  position: relative;
  margin: 11px 0;
  padding-left: 18px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
}
.ia-board li::before, .decision-copy li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
}
.ia-arrow { align-self: center; color: rgba(255,255,255,.26); }
.priority-map {
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  gap: 50px;
  margin-top: 30px;
  padding: 35px;
  border: 1px solid var(--line);
  border-radius: 24px;
}
.priority-label strong { display: block; margin-top: 14px; font-size: 22px; line-height: 1.35; }
.priority-rows p {
  display: grid;
  grid-template-columns: 110px 1fr;
  margin: 0;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
  font-size: 12px;
}
.priority-rows p:last-child { border-bottom: 0; }
.priority-rows b { color: var(--gold); font-size: 9px; letter-spacing: .14em; }
.priority-rows span { color: var(--muted); }

.decisions-section { background: #091014; }
.solution-intro { margin-bottom: 110px; }
.decision-block {
  display: grid;
  grid-template-columns: .72fr 1.28fr;
  gap: 70px;
  align-items: center;
  margin: 0 0 130px;
}
.decision-block.reverse { grid-template-columns: 1.2fr .8fr; }
.decision-block.reverse .decision-copy { order: 2; }
.decision-block.reverse .decision-media { order: 1; }
.decision-copy > span {
  color: var(--accent);
  font-size: 9px;
  font-weight: 900;
  letter-spacing: .18em;
}
.decision-copy h3 {
  margin: 18px 0 22px;
  font-size: clamp(31px, 3vw, 46px);
  line-height: 1.02;
  letter-spacing: -.045em;
}
.decision-copy p { color: var(--muted); font-size: 15px; }
.decision-media {
  position: relative;
  min-height: 460px;
}
.decision-media button { position: absolute; box-shadow: 0 32px 70px rgba(0,0,0,.38); }
.decision-media img { width: 100%; aspect-ratio: 2.16; object-fit: cover; }
.media-main { width: 88%; top: 0; right: 0; }
.media-secondary { width: 78%; left: 0; bottom: 0; border: 4px solid #19292f !important; }
.single-media {
  position: relative;
  min-height: 0;
  box-shadow: 0 35px 80px rgba(0,0,0,.46);
}
.single-media img { width: 100%; aspect-ratio: 2.16; object-fit: cover; }
.single-media span {
  display: block;
  padding: 13px 16px;
  color: rgba(255,255,255,.48);
  font-size: 9px;
  font-weight: 900;
  letter-spacing: .16em;
  text-align: left;
}
.interaction-sequence {
  margin: -40px 0 130px;
  padding: 42px;
  border: 1px solid var(--line);
  border-radius: 26px;
  background: #0e191e;
}
.interaction-sequence header {
  display: grid;
  grid-template-columns: .4fr 1.6fr;
  gap: 30px;
  align-items: end;
  margin-bottom: 30px;
}
.interaction-sequence h3 { margin: 0; max-width: 760px; font-size: 27px; line-height: 1.15; }
.sequence-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.sequence-grid img { width: 100%; aspect-ratio: 2.16; object-fit: cover; }
.sequence-grid span { display: block; padding: 13px; color: var(--muted); font-size: 11px; text-align: left; }
.sequence-grid b { margin-right: 8px; color: var(--accent); }

.iteration-section { background: #0c1519; }
.iteration-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.iteration-card {
  padding: 14px 14px 30px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(255,255,255,.025);
}
.iteration-card button { width: 100%; }
.iteration-card img { width: 100%; aspect-ratio: 2.16; object-fit: cover; }
.iteration-card > span { display: block; margin: 24px 18px 0; color: var(--accent); font-size: 9px; font-weight: 900; letter-spacing: .16em; }
.iteration-card h3 { margin: 10px 18px; font-size: 23px; }
.iteration-card p { margin: 0 18px; color: var(--muted); font-size: 13px; }
.contribution-strip {
  display: grid;
  grid-template-columns: .65fr 1.35fr;
  gap: 45px;
  margin-top: 70px;
  padding: 38px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.contribution-strip h3 { margin: 12px 0 0; font-size: 26px; }
.contribution-strip ol { display: grid; grid-template-columns: 1fr 1fr; gap: 0 28px; margin: 0; padding: 0; list-style: none; }
.contribution-strip li { padding: 13px 0; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.contribution-strip li span { margin-right: 13px; color: var(--accent); font-weight: 900; }

.reflection-section { background: #091014; }
.takeaway-panel { border-top: 1px solid var(--line); }
.takeaway-panel p {
  display: grid;
  grid-template-columns: 60px 1fr;
  margin: 0;
  padding: 27px 0;
  border-bottom: 1px solid var(--line);
}
.takeaway-panel small { color: var(--accent); font-weight: 900; }
.takeaway-panel strong { font-size: 18px; }
.case-end {
  padding: 150px 32px;
  text-align: center;
  background: linear-gradient(145deg, #0c191c, #13262b);
}
.case-end p { color: var(--accent); font-size: 9px; font-weight: 900; letter-spacing: .2em; }
.case-end h2 { margin: 18px 0 0; font-size: clamp(42px, 5vw, 72px); line-height: 1.05; letter-spacing: -.055em; }

.media-lightbox {
  width: min(96vw, 1500px);
  max-width: none;
  padding: 18px;
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 18px;
  background: #080c0e;
}
.media-lightbox::backdrop { background: rgba(0,0,0,.82); backdrop-filter: blur(7px); }
.media-lightbox img { width: 100%; max-height: 86vh; object-fit: contain; }
.lightbox-close {
  position: fixed;
  top: 22px;
  right: 28px;
  width: 46px;
  height: 46px;
  border: 1px solid rgba(255,255,255,.25);
  border-radius: 50%;
  color: white;
  background: rgba(9,16,20,.86);
  font-size: 27px;
  cursor: pointer;
}

@media (max-width: 980px) {
  .lingnian-hero { grid-template-columns: 1fr; min-height: 0; padding-top: 130px; }
  .hero-visual { min-height: 540px; }
  .split-layout, .reflection-layout, .section-heading, .decision-block,
  .decision-block.reverse, .before-evidence, .priority-map, .contribution-strip {
    grid-template-columns: 1fr;
    gap: 45px;
  }
  .decision-block.reverse .decision-copy, .decision-block.reverse .decision-media { order: initial; }
  .ia-board { grid-template-columns: 1fr; }
  .ia-arrow { transform: rotate(90deg); justify-self: center; }
  .diagnosis-grid { grid-template-columns: 1fr; }
  .diagnosis-card { min-height: 0; }
  .diagnosis-card h3 { margin-top: 35px; }
}

@media (max-width: 700px) {
  .section-shell { width: min(100% - 36px, 1180px); }
  .lingnian-hero { padding: 112px 18px 68px; gap: 30px; }
  .hero-copy h1 { font-size: clamp(34px, 9.7vw, 38px); line-height: 1.03; }
  .hero-copy h1 span { white-space: nowrap; }
  .hero-summary { font-size: 15px; }
  .hero-meta { grid-template-columns: 1fr; }
  .hero-visual { min-height: 380px; }
  .shot-overview { width: 92%; }
  .shot-embed { width: 96%; bottom: 24px; }
  .hero-status { display: none; }
  .case-section { padding: 85px 0; }
  .section-copy h2, .section-heading h2, .solution-intro h2, .reflection-copy h2 { font-size: 39px; }
  .complexity-model { min-height: 400px; }
  .model-core { width: 160px; height: 160px; }
  .before-images, .iteration-grid, .sequence-grid, .contribution-strip ol { grid-template-columns: 1fr; }
  .before-images img { height: auto; aspect-ratio: 2.16; }
  .decision-block { margin-bottom: 90px; }
  .decision-media { min-height: 310px; }
  .interaction-sequence { margin-top: -15px; padding: 25px 16px; }
  .interaction-sequence header { grid-template-columns: 1fr; }
  .priority-rows p { grid-template-columns: 1fr; gap: 7px; }
  .case-end { padding: 100px 18px; }
}