/* ====== 主题变量 ====== */
:root {
  /* 暗色默认 */
  --bg-0: #05070d;
  --bg-1: #0a0f1c;
  --bg-2: #0f172a;
  --bg-mid: #080c18;
  --ink-0: #f8fafc;
  --ink-1: #cbd5e1;
  --ink-2: #64748b;
  --ink-3: #334155;
  --teal: #5eead4;
  --pink: #f472b6;
  --violet: #a78bfa;
  --amber: #fbbf24;
  /* RGB 通道 (用于 rgba() / 渐变) */
  --bg-0-rgb: 5, 7, 13;
  --bg-1-rgb: 10, 15, 28;
  --bg-2-rgb: 15, 23, 42;
  --ink-1-rgb: 203, 213, 225;
  --border-rgb: 148, 163, 184;
  --teal-rgb: 94, 234, 212;
  --pink-rgb: 244, 114, 182;
  --violet-rgb: 167, 139, 250;
  /* 字体 */
  --serif: "Fraunces", "Songti SC", Georgia, serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
  --maxw: 1400px;
}

/* 亮色主题 · 科学白皮书 */
[data-theme="light"] {
  --bg-0: #f1f3f5;
  --bg-1: #e2e6ea;
  --bg-2: #d1d7de;
  --bg-mid: #e9ecf0;
  --ink-0: #0e1117;
  --ink-1: #2c3344;
  --ink-2: #5b6478;
  --ink-3: #a0a9b8;
  --teal: #0d9488;
  --pink: #db2777;
  --violet: #7c3aed;
  --amber: #d97706;
  --bg-0-rgb: 241, 243, 245;
  --bg-1-rgb: 226, 230, 234;
  --bg-2-rgb: 209, 215, 222;
  --ink-1-rgb: 44, 51, 68;
  --border-rgb: 144, 156, 176;
  --teal-rgb: 13, 148, 136;
  --pink-rgb: 219, 39, 119;
  --violet-rgb: 124, 58, 237;
}
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: var(--mono);
  background: var(--bg-0);
  color: var(--ink-1);
  overflow-x: hidden;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  transition:
    background 0.5s,
    color 0.5s;
}
::selection {
  background: var(--pink);
  color: #0a0a0a;
}
a {
  color: inherit;
  text-decoration: none;
}
em {
  font-style: italic;
}
button {
  font-family: inherit;
  cursor: pointer;
  background: none;
  border: none;
  color: inherit;
}

/* 主题切换按钮 */
.theme-btn {
  position: relative;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--ink-3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  line-height: 1;
  transition: all 0.35s cubic-bezier(0.2, 0.7, 0.2, 1);
  color: var(--amber);
  background: transparent;
  cursor: pointer;
}
.theme-btn:hover {
  border-color: var(--amber);
  box-shadow: 0 0 14px var(--amber);
  transform: scale(1.08);
}
.theme-btn:active {
  transform: scale(0.92);
}
.theme-btn .icon-dark,
.theme-btn .icon-light {
  position: absolute;
  transition:
    opacity 0.35s,
    transform 0.35s cubic-bezier(0.2, 0.7, 0.2, 1);
}
[data-theme="dark"] .theme-btn .icon-light {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}
[data-theme="dark"] .theme-btn .icon-dark {
  opacity: 0;
  transform: rotate(-90deg) scale(0.4);
}
[data-theme="light"] .theme-btn .icon-light {
  opacity: 0;
  transform: rotate(90deg) scale(0.4);
}
[data-theme="light"] .theme-btn .icon-dark {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

/* 背景层 */
.bg-layers {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(
      ellipse 80% 60% at 50% 0%,
      rgba(var(--teal-rgb), 0.1),
      transparent 60%
    ),
    radial-gradient(
      ellipse 60% 40% at 50% 100%,
      rgba(var(--pink-rgb), 0.08),
      transparent 70%
    ),
    linear-gradient(180deg, var(--bg-0) 0%, var(--bg-mid) 50%, var(--bg-0) 100%);
}
.grid-floor {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(var(--teal-rgb), 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(var(--teal-rgb), 0.05) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(
    ellipse 70% 70% at 50% 40%,
    #000 30%,
    transparent 80%
  );
  -webkit-mask-image: radial-gradient(
    ellipse 70% 70% at 50% 40%,
    #000 30%,
    transparent 80%
  );
}
.gravity-field {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.7;
  animation: fieldPulse 14s ease-in-out infinite;
}
.gravity-field .ripples circle {
  transform-origin: 800px 450px;
  animation: ripple 8s linear infinite;
}
.gravity-field .ripples circle:nth-child(2) {
  animation-delay: -2s;
}
.gravity-field .ripples circle:nth-child(3) {
  animation-delay: -4s;
}
.gravity-field .ripples circle:nth-child(4) {
  animation-delay: -6s;
}
@keyframes ripple {
  0% {
    transform: scale(0.6);
    opacity: 0;
  }
  20% {
    opacity: 1;
  }
  100% {
    transform: scale(1.4);
    opacity: 0;
  }
}
@keyframes fieldPulse {
  0%,
  100% {
    opacity: 0.55;
  }
  50% {
    opacity: 0.85;
  }
}
.stars {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(1px 1px at 20% 30%, #fff 50%, transparent),
    radial-gradient(1px 1px at 80% 60%, #fff 50%, transparent),
    radial-gradient(1.5px 1.5px at 40% 80%, #a78bfa 50%, transparent),
    radial-gradient(1px 1px at 65% 20%, #fff 50%, transparent),
    radial-gradient(1px 1px at 90% 90%, #fff 50%, transparent),
    radial-gradient(1.5px 1.5px at 10% 70%, #5eead4 50%, transparent),
    radial-gradient(1px 1px at 55% 50%, #fff 50%, transparent),
    radial-gradient(1px 1px at 30% 10%, #fff 50%, transparent);
  background-size: 1200px 800px;
  opacity: 0.4;
  animation: twinkle 6s ease-in-out infinite alternate;
}
@keyframes twinkle {
  from {
    opacity: 0.25;
  }
  to {
    opacity: 0.55;
  }
}

/* 亮色主题隐去星光点阵 */
[data-theme="light"] .stars {
  display: none;
}

.noise {
  position: absolute;
  inset: 0;
  opacity: 0.05;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/></filter><rect width='100%25' height='100%25' filter='url(%23n)' opacity='0.7'/></svg>");
}

/* 导航 */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 36px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  background: linear-gradient(
    180deg,
    rgba(var(--bg-0-rgb), 0.85),
    rgba(var(--bg-0-rgb), 0)
  );
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  animation: navIn 1s 0.2s both ease-out;
}
@keyframes navIn {
  from {
    transform: translateY(-30px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink-0);
  font-weight: 500;
}
.brand-mark {
  color: var(--teal);
  font-size: 20px;
  display: inline-block;
  animation: spinSlow 14s linear infinite;
}
@keyframes spinSlow {
  to {
    transform: rotate(360deg);
  }
}
.brand-text em {
  color: var(--pink);
  font-style: normal;
  font-weight: 700;
  margin-left: 2px;
}
.nav-links {
  display: flex;
  gap: 28px;
}
.nav-links a {
  position: relative;
  color: var(--ink-1);
  transition: color 0.3s;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 1px;
  background: var(--teal);
  transition: width 0.3s;
}
.nav-links a:hover {
  color: var(--teal);
}
.nav-links a:hover::after {
  width: 100%;
}
.nav-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink-2);
}
.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 8px var(--teal);
  animation: blink 1.5s ease-in-out infinite;
}
@keyframes blink {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.3;
  }
}

/* HERO */
.hero {
  min-height: 100vh;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 160px 36px 80px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
}
.hero-tag {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-2);
  letter-spacing: 0.2em;
  margin-bottom: 32px;
  overflow: hidden;
  animation: fadeIn 1s 0.4s both;
}
.ticker {
  display: inline-block;
  animation: slideIn 1.2s 0.6s both cubic-bezier(0.2, 0.7, 0.2, 1);
}
@keyframes slideIn {
  from {
    transform: translateX(-30px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.hero-title {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(56px, 9vw, 150px);
  line-height: 0.92;
  color: var(--ink-0);
  letter-spacing: -0.02em;
  margin-bottom: 40px;
}
.hero-title .line {
  display: block;
  overflow: hidden;
}
.hero-title .line > * {
  display: inline-block;
}
.hero-title em {
  font-style: italic;
  background: linear-gradient(120deg, var(--pink), var(--violet), var(--teal));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  font-weight: 500;
}
.line-1 {
  animation: lineUp 1s 0.7s both cubic-bezier(0.2, 0.7, 0.2, 1);
}
.line-2 {
  animation: lineUp 1s 0.85s both cubic-bezier(0.2, 0.7, 0.2, 1);
}
.line-3 {
  animation: lineUp 1s 1s both cubic-bezier(0.2, 0.7, 0.2, 1);
}
@keyframes lineUp {
  from {
    transform: translateY(110%);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.hero-sub {
  max-width: 620px;
  font-size: 15px;
  color: var(--ink-1);
  line-height: 1.75;
  margin-bottom: 40px;
  animation: fadeUp 1s 1.2s both;
}
.hero-sub u {
  text-decoration: none;
  background: linear-gradient(transparent 70%, rgba(var(--pink-rgb), 0.35) 70%);
  padding: 0 2px;
}
@keyframes fadeUp {
  from {
    transform: translateY(20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  animation: fadeUp 1s 1.4s both;
}
.btn-primary,
.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 24px;
  font-size: 13px;
  letter-spacing: 0.08em;
  transition: all 0.3s cubic-bezier(0.2, 0.7, 0.2, 1);
  cursor: pointer;
}
.btn-primary {
  background: var(--ink-0);
  color: var(--bg-0);
  border: 1px solid var(--ink-0);
  position: relative;
  overflow: hidden;
}
.btn-primary::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, var(--pink), var(--violet), var(--teal));
  transform: translateX(-101%);
  transition: transform 0.5s cubic-bezier(0.2, 0.7, 0.2, 1);
  z-index: 0;
}
.btn-primary > * {
  position: relative;
  z-index: 1;
}
.btn-primary:hover {
  color: var(--ink-0);
}
.btn-primary:hover::before {
  transform: translateX(0);
}
.btn-ghost {
  color: var(--ink-1);
  border: 1px solid var(--ink-3);
}
.btn-ghost:hover {
  color: var(--teal);
  border-color: var(--teal);
  transform: translateX(4px);
}

/* HERO visual SVG */
.hero-visual {
  margin-top: 64px;
  width: 100%;
  animation: fadeUp 1.4s 1.6s both;
}
.hero-svg {
  width: 100%;
  max-width: 900px;
  display: block;
  margin: 0 auto;
  height: auto;
}
.hero-svg .bubble {
  animation: bubbleBreathe 4s ease-in-out infinite;
  transform-origin: 400px 120px;
}
.hero-svg .bubble-2 {
  animation: bubbleBreathe 4s 0.3s ease-in-out infinite;
  transform-origin: 400px 120px;
}
@keyframes bubbleBreathe {
  0%,
  100% {
    transform: scale(1);
    opacity: 0.85;
  }
  50% {
    transform: scale(1.04);
    opacity: 1;
  }
}
.hero-svg .ship {
  animation: shipBob 3s ease-in-out infinite;
}
@keyframes shipBob {
  0%,
  100% {
    transform: translate(400px, 120px);
  }
  50% {
    transform: translate(404px, 118px);
  }
}
.ship-glow {
  animation: thrustPulse 0.9s ease-in-out infinite alternate;
}
@keyframes thrustPulse {
  from {
    r: 2.2;
    opacity: 0.6;
  }
  to {
    r: 4;
    opacity: 1;
  }
}
.hero-svg .starlines line {
  stroke-dasharray: 8 16;
  animation: warpFlow 1.8s linear infinite;
}
.hero-svg .starlines line:nth-child(2) {
  animation-duration: 1.2s;
}
.hero-svg .starlines line:nth-child(3) {
  animation-duration: 2.4s;
}
@keyframes warpFlow {
  from {
    stroke-dashoffset: 0;
  }
  to {
    stroke-dashoffset: -240;
  }
}
.hero-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  fill: var(--ink-1);
}
.hero-label.compress {
  fill: var(--pink);
}
.hero-label.expand {
  fill: var(--teal);
}

.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 36px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 10px;
  letter-spacing: 0.3em;
  color: var(--ink-2);
  animation: fadeIn 1s 2s both;
}
.scroll-line {
  display: inline-block;
  width: 60px;
  height: 1px;
  background: linear-gradient(90deg, var(--teal), transparent);
  position: relative;
  overflow: hidden;
}
.scroll-line::after {
  content: "";
  position: absolute;
  left: -30%;
  top: 0;
  width: 30%;
  height: 100%;
  background: var(--teal);
  animation: scrollPulse 2s ease-in-out infinite;
}
@keyframes scrollPulse {
  0% {
    left: -30%;
  }
  100% {
    left: 100%;
  }
}

/* 通用 section-head */
.principle,
.diagram,
.specs,
.timeline {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 120px 36px;
  position: relative;
}
.section-head {
  margin-bottom: 60px;
  max-width: 880px;
}
.section-no {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--teal);
  letter-spacing: 0.3em;
  padding: 6px 12px;
  border: 1px solid rgba(var(--teal-rgb), 0.3);
  border-radius: 99px;
  margin-bottom: 24px;
}
.section-head h2 {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(34px, 5vw, 68px);
  line-height: 1.05;
  color: var(--ink-0);
  letter-spacing: -0.01em;
}
.section-head h2 em {
  font-style: italic;
  background: linear-gradient(120deg, var(--pink), var(--violet));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  font-weight: 500;
}
.section-sub {
  margin-top: 20px;
  font-size: 15px;
  color: var(--ink-1);
  max-width: 680px;
  line-height: 1.75;
}

/* 原理卡片 */
.principle-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 60px;
}
.card {
  position: relative;
  padding: 36px 28px;
  background: linear-gradient(
    180deg,
    rgba(var(--bg-2-rgb), 0.6),
    rgba(var(--bg-2-rgb), 0.2)
  );
  border: 1px solid rgba(var(--border-rgb), 0.12);
  border-radius: 2px;
  overflow: hidden;
  transition: all 0.5s cubic-bezier(0.2, 0.7, 0.2, 1);
}
.card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--teal), transparent);
  transform: translateX(-100%);
  transition: transform 0.7s;
}
.card:hover {
  transform: translateY(-4px);
  border-color: rgba(var(--teal-rgb), 0.4);
  background: linear-gradient(
    180deg,
    rgba(var(--bg-2-rgb), 0.8),
    rgba(var(--bg-2-rgb), 0.4)
  );
}
.card:hover::before {
  transform: translateX(100%);
}
.card-no {
  font-family: var(--serif);
  font-style: italic;
  font-size: 14px;
  color: var(--pink);
  margin-bottom: 18px;
  letter-spacing: 0.05em;
}
.card h3 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 22px;
  color: var(--ink-0);
  margin-bottom: 14px;
  line-height: 1.3;
}
.card p {
  font-size: 13.5px;
  color: var(--ink-1);
  line-height: 1.75;
}

/* 公式 */
.formula {
  padding: 32px 36px;
  background: linear-gradient(
    135deg,
    rgba(var(--violet-rgb), 0.06),
    rgba(var(--teal-rgb), 0.04)
  );
  border: 1px solid rgba(var(--violet-rgb), 0.2);
  border-radius: 4px;
  position: relative;
  overflow: hidden;
}
.formula::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 3px;
  background: linear-gradient(180deg, var(--pink), var(--violet), var(--teal));
}
.formula figcaption {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-2);
  letter-spacing: 0.2em;
  margin-bottom: 16px;
}
.formula code {
  font-family: var(--mono);
  font-size: clamp(14px, 2vw, 20px);
  color: var(--ink-0);
  font-weight: 500;
  display: block;
  padding: 8px 0;
}
.formula sub {
  font-size: 0.65em;
  color: var(--teal);
}
.formula-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid rgba(var(--border-rgb), 0.1);
  font-size: 11px;
  color: var(--ink-2);
  letter-spacing: 0.05em;
}
.formula-legend b {
  color: var(--teal);
  font-weight: 500;
  margin-right: 6px;
}

/* 引擎图解 */
.diagram-stage {
  padding: 32px;
  background: linear-gradient(
    180deg,
    rgba(var(--bg-1-rgb), 0.8),
    rgba(var(--bg-0-rgb), 0.6)
  );
  border: 1px solid rgba(var(--teal-rgb), 0.15);
  border-radius: 4px;
  position: relative;
}
.diagram-stage::before {
  content: "WARP-DIAGRAM/01";
  position: absolute;
  top: -9px;
  left: 24px;
  background: var(--bg-0);
  padding: 0 8px;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--teal);
  letter-spacing: 0.25em;
}
.diagram-ctl {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 20px;
  padding-bottom: 18px;
  border-bottom: 1px solid rgba(var(--border-rgb), 0.1);
}
.ctl {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ink-1);
  padding: 8px 14px;
  border: 1px solid var(--ink-3);
  transition: all 0.25s;
  cursor: pointer;
  background: transparent;
}
.ctl:hover {
  color: var(--teal);
  border-color: var(--teal);
}
.ctl.active {
  color: var(--bg-0);
  background: var(--teal);
  border-color: var(--teal);
}
.ctl-status {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-2);
  letter-spacing: 0.1em;
}
.ctl-status::before {
  content: "● ";
  color: var(--teal);
  animation: blink 1.2s infinite;
}
.warp-svg {
  width: 100%;
  height: auto;
  display: block;
  background: radial-gradient(
    ellipse 70% 70% at 50% 50%,
    rgba(var(--bg-2-rgb), 0.6),
    rgba(var(--bg-0-rgb), 0)
  );
  border-radius: 2px;
}
.flat-grid {
  opacity: 0.45;
}
.warp-grid-group path {
  fill: none;
  stroke: var(--teal);
  stroke-width: 0.7;
  stroke-opacity: 0.55;
  transition: stroke-opacity 0.6s;
}
.warp-grid-group.active path {
  stroke-opacity: 0.9;
}
#bubbleHalo {
  opacity: 0;
  transition: opacity 1.2s;
  transform-box: fill-box;
  transform-origin: center;
}
.active #bubbleHalo,
.diagram-stage.warp-on #bubbleHalo {
  opacity: 1;
  animation: haloPulse 3s ease-in-out infinite;
}
@keyframes haloPulse {
  0%,
  100% {
    opacity: 0.85;
  }
  50% {
    opacity: 1;
  }
}

.zone-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  font-weight: 500;
}
.zone-label.pink {
  fill: var(--pink);
}
.zone-label.teal {
  fill: var(--teal);
}
.zone-sub {
  font-family: var(--mono);
  font-size: 10px;
  fill: var(--ink-2);
  letter-spacing: 0.1em;
}
.axis-label {
  font-family: var(--mono);
  font-size: 11px;
  fill: var(--ink-1);
  letter-spacing: 0.1em;
}
.axis-label.dim {
  fill: var(--ink-2);
  font-size: 10px;
}

#frontArrow,
#rearArrow {
  opacity: 0;
  transition: opacity 0.6s;
}
.warp-on #frontArrow,
.warp-on #rearArrow {
  opacity: 1;
}
.warp-on #frontFill {
  opacity: 1;
  transition: opacity 0.8s;
}
.warp-on #rearFill {
  opacity: 1;
  transition: opacity 0.8s;
}

.bubble-outline {
  transform-box: fill-box;
  transform-origin: center;
}
.warp-on .bubble-outline {
  animation: dashSpin 8s linear infinite;
}
@keyframes dashSpin {
  to {
    stroke-dashoffset: -200;
  }
}
.ship-art polygon {
  fill: var(--ink-0);
}
.warp-on .ship-art {
  animation: shipPulse 1.8s ease-in-out infinite;
}
@keyframes shipPulse {
  0%,
  100% {
    transform: translateX(0);
  }
  50% {
    transform: translateX(3px);
  }
}

#shapeFn {
  stroke-dasharray: 300;
  stroke-dashoffset: 300;
  transition: stroke-dashoffset 1.5s ease-out;
}
.warp-on #shapeFn {
  stroke-dashoffset: 0;
}

.gw-ripples ellipse {
  fill: none;
  stroke: var(--teal);
  stroke-opacity: 0.5;
}

/* 图解说明 */
.diagram-legend {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 24px;
}
.lg-item {
  display: flex;
  gap: 12px;
  padding: 14px 16px;
  background: rgba(var(--bg-2-rgb), 0.5);
  border: 1px solid rgba(var(--border-rgb), 0.1);
  border-radius: 2px;
}
.lg-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 4px;
  box-shadow: 0 0 8px currentColor;
}
.lg-dot.pink {
  background: var(--pink);
  color: var(--pink);
}
.lg-dot.purple {
  background: var(--violet);
  color: var(--violet);
}
.lg-dot.teal {
  background: var(--teal);
  color: var(--teal);
}
.lg-item b {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-0);
  letter-spacing: 0.05em;
}
.lg-item small {
  font-size: 11px;
  color: var(--ink-2);
  line-height: 1.6;
}

/* 参数 */
.specs-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: rgba(var(--border-rgb), 0.12);
  border: 1px solid rgba(var(--border-rgb), 0.12);
}
.spec {
  padding: 36px 28px;
  background: var(--bg-0);
  position: relative;
  transition: background 0.4s;
}
.spec:hover {
  background: rgba(var(--bg-2-rgb), 0.6);
}
.spec-key {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-2);
  letter-spacing: 0.15em;
  margin-bottom: 18px;
}
.spec-key sub {
  font-size: 0.7em;
  color: var(--teal);
}
.spec-val {
  font-family: var(--serif);
  font-weight: 300;
  font-size: 64px;
  line-height: 1;
  color: var(--ink-0);
  letter-spacing: -0.02em;
  margin-bottom: 14px;
  font-variant-numeric: tabular-nums;
}
.spec-unit {
  font-size: 11px;
  color: var(--ink-2);
  letter-spacing: 0.05em;
  line-height: 1.5;
}

/* 时序 */
.tl-list {
  list-style: none;
  border-left: 1px solid rgba(var(--teal-rgb), 0.25);
  padding-left: 0;
  margin-left: 8px;
}
.tl-list li {
  position: relative;
  padding: 24px 0 24px 36px;
  display: flex;
  align-items: baseline;
  gap: 24px;
  border-bottom: 1px dashed rgba(var(--border-rgb), 0.08);
}
.tl-list li::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 32px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bg-0);
  border: 1px solid var(--teal);
  transition: all 0.3s;
}
.tl-list li:hover::before {
  background: var(--teal);
  box-shadow: 0 0 12px var(--teal);
}
.tl-t {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--pink);
  letter-spacing: 0.15em;
  min-width: 110px;
  flex-shrink: 0;
}
.tl-d {
  font-size: 14px;
  color: var(--ink-1);
  line-height: 1.6;
}
.tl-d sub {
  font-size: 0.7em;
  color: var(--teal);
}

/* 页脚 */
.foot {
  max-width: var(--maxw);
  margin: 80px auto 0;
  padding: 60px 36px 36px;
  border-top: 1px solid rgba(var(--border-rgb), 0.12);
}
.foot-grid {
  display: grid;
  grid-template-columns: 1.2fr 1.5fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.foot-grid p {
  font-size: 13px;
  color: var(--ink-2);
  line-height: 1.7;
  margin-top: 14px;
}
.foot-grid h4 {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--teal);
  letter-spacing: 0.2em;
  margin-bottom: 16px;
  text-transform: uppercase;
}
.foot-grid ul {
  list-style: none;
}
.foot-grid li {
  font-size: 12px;
  color: var(--ink-1);
  line-height: 1.7;
  margin-bottom: 8px;
  padding-left: 14px;
  position: relative;
}
.foot-grid li::before {
  content: "›";
  position: absolute;
  left: 0;
  color: var(--pink);
}
.foot-grid i {
  color: var(--ink-0);
  font-style: italic;
  font-family: var(--serif);
}
.foot-bottom {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 24px;
  border-top: 1px solid rgba(var(--border-rgb), 0.08);
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-2);
  letter-spacing: 0.2em;
}
.glitch {
  color: var(--teal);
  animation: glitch 4s steps(2, end) infinite;
}
@keyframes glitch {
  0%,
  90%,
  100% {
    opacity: 1;
    text-shadow: none;
  }
  92% {
    opacity: 0.8;
    text-shadow:
      2px 0 var(--pink),
      -2px 0 var(--teal);
  }
  94% {
    opacity: 1;
    text-shadow: -1px 0 var(--violet);
  }
  96% {
    opacity: 0.6;
    text-shadow: 1px 0 var(--pink);
  }
}

/* 滚动揭示 */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: all 1.1s cubic-bezier(0.2, 0.7, 0.2, 1);
}
.reveal.in {
  opacity: 1;
  transform: translateY(0);
}
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(24px);
  transition: all 0.9s cubic-bezier(0.2, 0.7, 0.2, 1);
}
.reveal-stagger.in > * {
  opacity: 1;
  transform: translateY(0);
}
.reveal-stagger.in > *:nth-child(1) {
  transition-delay: 0.05s;
}
.reveal-stagger.in > *:nth-child(2) {
  transition-delay: 0.18s;
}
.reveal-stagger.in > *:nth-child(3) {
  transition-delay: 0.31s;
}
.reveal-stagger.in > *:nth-child(4) {
  transition-delay: 0.44s;
}
.reveal-stagger.in > *:nth-child(5) {
  transition-delay: 0.57s;
}
.reveal-stagger.in > *:nth-child(6) {
  transition-delay: 0.7s;
}

/* 响应式 */
@media (max-width: 980px) {
  .nav {
    padding: 14px 20px;
  }
  .nav-links {
    display: none;
  }
  .hero {
    padding: 140px 20px 60px;
  }
  .principle,
  .diagram,
  .specs,
  .timeline {
    padding: 80px 20px;
  }
  .principle-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .specs-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .diagram-legend {
    grid-template-columns: 1fr;
  }
  .foot-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .diagram-stage {
    padding: 18px;
  }
  .ctl-status {
    margin-left: 0;
    width: 100%;
    margin-top: 6px;
  }
}
@media (max-width: 560px) {
  .specs-grid {
    grid-template-columns: 1fr;
  }
  .spec-val {
    font-size: 48px;
  }
  .tl-list li {
    flex-direction: column;
    gap: 6px;
  }
}