:root {
  color-scheme: dark;
  --bg: #0b0c10;
  --surface: #12141a;
  --surface-raised: #171a21;
  --line: #242833;
  --line-soft: rgba(255, 255, 255, 0.06);
  --text: #f3f5f9;
  --muted: #98a0af;
  --dim: #666e7d;
  --accent: #5b8dff;
  --accent-soft: #9db8ff;
  --green: #4fd18b;
  --mono: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Consolas, monospace;
  font-family: Inter, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  min-width: 320px;
  margin: 0;
  overflow-x: hidden;
  color: var(--text);
  background:
    radial-gradient(900px 520px at 78% -8%, rgba(83, 100, 255, 0.16), transparent 70%),
    radial-gradient(700px 420px at 8% 12%, rgba(37, 166, 255, 0.08), transparent 70%),
    var(--bg);
  background-repeat: no-repeat;
}

[hidden] {
  display: none !important;
}

a {
  color: inherit;
}

code {
  padding: 2px 6px;
  color: #c9d7ff;
  background: rgba(111, 156, 255, 0.1);
  border-radius: 5px;
  font: 0.86em/1.5 var(--mono);
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent-soft);
  font: 600 11px/1 var(--mono);
  letter-spacing: 0.16em;
}

/* 导航 */

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line-soft);
  background: rgba(11, 12, 16, 0.72);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
}

.nav-inner,
.hero,
.section,
.footer-inner {
  width: min(1200px, 100% - 64px);
  margin-inline: auto;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 68px;
}

.brand {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 11px;
  text-decoration: none;
}

.brand-logo {
  width: 34px;
  height: 34px;
  flex: none;
  filter: drop-shadow(0 6px 18px rgba(64, 120, 255, 0.35));
}

.brand-text {
  display: grid;
  min-width: 0;
  gap: 4px;
  line-height: 1;
}

.brand-text strong {
  overflow: hidden;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.brand-text small {
  color: var(--dim);
  font: 600 9px/1 var(--mono);
  letter-spacing: 0.2em;
}

.nav nav {
  display: flex;
  gap: 6px;
}

.nav nav a {
  padding: 8px 14px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
  transition: color 0.2s ease, background 0.2s ease;
}

.nav nav a:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.05);
}

/* 首屏 */

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  align-items: center;
  gap: 56px;
  min-height: min(calc(100svh - 68px), 860px);
  padding: 56px 0 32px;
}

.hero-copy {
  animation: rise-in 0.7s both cubic-bezier(0.2, 0.75, 0.3, 1);
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 26px;
  padding: 7px 14px 7px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.03);
  font-size: 13px;
}

.status-pill i {
  position: relative;
  width: 8px;
  height: 8px;
  flex: none;
  border-radius: 50%;
  background: var(--dim);
}

.status-pill[data-state="live"] {
  color: #c9f2da;
  border-color: rgba(79, 209, 139, 0.28);
  background: rgba(79, 209, 139, 0.07);
}

.status-pill[data-state="live"] i {
  background: var(--green);
}

.status-pill[data-state="live"] i::after {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: var(--green);
  content: "";
  animation: ping 2s cubic-bezier(0, 0, 0.2, 1) infinite;
}

.status-pill[data-state="idle"] i {
  background: #e1ba6d;
}

.hero h1 {
  margin: 0;
  font-size: clamp(52px, 7.4vw, 104px);
  font-weight: 750;
  letter-spacing: -0.06em;
  line-height: 0.98;
}

.hero h1 span {
  background: linear-gradient(100deg, #ffffff 0%, var(--accent-soft) 45%, #7b6dff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-lead {
  max-width: 480px;
  margin: 26px 0 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.8;
}

.hero-methods {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.hero-methods:empty {
  display: none;
}

.hero-methods li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px 6px 6px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  font-size: 13px;
}

.hero-methods .method-icon {
  width: 24px;
  height: 24px;
  border-radius: 7px;
  font-size: 12px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 36px;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 44px;
  padding: 0 20px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.button.primary {
  color: #fff;
  background: linear-gradient(135deg, #2f8cff, #5364ff);
  box-shadow: 0 10px 30px rgba(64, 110, 255, 0.28), inset 0 1px 0 rgba(255, 255, 255, 0.18);
}

.button.primary:hover {
  box-shadow: 0 14px 36px rgba(64, 110, 255, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.18);
  transform: translateY(-1px);
}

.button.ghost {
  color: var(--text);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
}

.button.ghost:hover {
  border-color: #3a4050;
  background: rgba(255, 255, 255, 0.05);
}

/* 信号示意图 */

.stage {
  position: relative;
  margin: 0;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.025), transparent 40%),
    var(--surface);
  box-shadow: 0 40px 80px -30px rgba(0, 0, 0, 0.7), 0 0 0 1px rgba(255, 255, 255, 0.02) inset;
  animation: rise-in 0.8s 0.1s both cubic-bezier(0.2, 0.75, 0.3, 1);
}

.stage::before {
  position: absolute;
  inset: -1px;
  z-index: -1;
  border-radius: 21px;
  background: radial-gradient(420px 220px at 70% 0%, rgba(91, 141, 255, 0.35), transparent 70%);
  content: "";
  filter: blur(30px);
  opacity: 0.6;
}

.stage-head,
.stage-foot {
  display: flex;
  justify-content: space-between;
  color: var(--dim);
  font: 600 10px/1 var(--mono);
  letter-spacing: 0.16em;
}

.stage-live {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.stage-live::before {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--dim);
  content: "";
}

.stage-live[data-state="live"] {
  color: var(--green);
}

.stage-live[data-state="live"]::before {
  background: var(--green);
  box-shadow: 0 0 8px var(--green);
}

.stage-canvas {
  position: relative;
  aspect-ratio: 6 / 5;
  margin: 14px 0;
  border-radius: 12px;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-position: center;
  background-size: 40px 40px;
  -webkit-mask-image: radial-gradient(ellipse at center, #000 62%, transparent 100%);
  mask-image: radial-gradient(ellipse at center, #000 62%, transparent 100%);
}

.stage-canvas svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
}

.trace {
  fill: none;
  stroke: rgba(111, 156, 255, 0.55);
  stroke-width: 1.4;
  stroke-dasharray: 4 9;
  vector-effect: non-scaling-stroke;
  animation: dash 2.6s linear infinite;
}

.trace.trunk {
  stroke: rgba(79, 209, 139, 0.6);
}

.trace.ghost {
  stroke: rgba(255, 255, 255, 0.14);
  animation: none;
}

.dot-source {
  fill: #6f9cff;
}

.dot-source.ghost {
  fill: #3a4050;
}

.packet {
  fill: #cfe0ff;
  filter: drop-shadow(0 0 4px #6f9cff);
}

.packet.settled {
  fill: #b9f5d3;
  filter: drop-shadow(0 0 4px var(--green));
}

.hub-ring {
  fill: none;
  stroke: rgba(111, 156, 255, 0.5);
  transform-box: fill-box;
  transform-origin: center;
  animation: ring 2.4s ease-out infinite;
}

.hub-core {
  fill: #0e1320;
  stroke: #6f9cff;
  stroke-width: 2;
  filter: drop-shadow(0 0 14px rgba(111, 156, 255, 0.7));
}

.target-core {
  fill: var(--green);
  filter: drop-shadow(0 0 10px rgba(79, 209, 139, 0.8));
}

.stage-node,
.source-chip {
  position: absolute;
  display: grid;
  gap: 4px;
  line-height: 1.2;
}

.stage-node strong {
  font: 700 12px/1 var(--mono);
  letter-spacing: 0.04em;
}

.stage-node small,
.source-chip small {
  color: var(--dim);
  font-size: 11px;
}

.hub-label {
  top: calc(50% + 34px);
  left: 58.33%;
  text-align: center;
  transform: translateX(-50%);
}

.target-label {
  right: 0;
  bottom: calc(50% + 22px);
  text-align: right;
}

.target-label strong {
  color: var(--green);
}

.source-chip {
  left: 7.5%;
  max-width: 44%;
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: rgba(18, 20, 26, 0.92);
  transform: translateY(calc(-100% - 8px));
  animation: fade-in 0.5s both ease-out;
}

.source-chip strong {
  overflow: hidden;
  font-size: 12.5px;
  font-weight: 600;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.source-chip.ghost {
  border-style: dashed;
  background: transparent;
}

.source-chip.ghost strong {
  color: var(--muted);
}

/* 分区 */

.section {
  padding: 112px 0 0;
}

.section-head {
  max-width: 640px;
  margin-bottom: 44px;
}

.section-head h2 {
  margin: 0;
  font-size: clamp(30px, 3.6vw, 44px);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.15;
}

.section-head > p:not(.eyebrow) {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

/* 支付方式 */

.method-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.method-card {
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-height: 196px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background:
    radial-gradient(260px 140px at 0% 0%, color-mix(in srgb, var(--tone, #5b8dff) 14%, transparent), transparent 70%),
    var(--surface);
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  animation: rise-in 0.5s both cubic-bezier(0.2, 0.75, 0.3, 1);
}

.method-card:hover {
  border-color: color-mix(in srgb, var(--tone, #5b8dff) 45%, var(--line));
  box-shadow: 0 24px 50px -28px color-mix(in srgb, var(--tone, #5b8dff) 60%, transparent);
  transform: translateY(-3px);
}

.method-card.skeleton {
  background: linear-gradient(100deg, var(--surface) 30%, var(--surface-raised) 50%, var(--surface) 70%);
  background-size: 300% 100%;
  animation: shimmer 1.6s linear infinite;
}

.method-icon {
  display: grid;
  width: 44px;
  height: 44px;
  flex: none;
  place-items: center;
  border-radius: 12px;
  color: #fff;
  background: var(--tone, #5b8dff);
  box-shadow: 0 8px 22px -8px var(--tone, #5b8dff), inset 0 1px 0 rgba(255, 255, 255, 0.25);
  font-size: 20px;
  font-weight: 800;
}

.method-icon svg {
  width: 56%;
  height: 56%;
}

.method-heading h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
}

.method-heading p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.6;
}

.method-foot {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: auto 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
  color: var(--muted);
  font-size: 12.5px;
}

.method-foot i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 8px var(--green);
}

.method-empty {
  grid-column: 1 / -1;
  display: grid;
  justify-items: center;
  gap: 10px;
  padding: 56px 24px;
  border: 1px dashed var(--line);
  border-radius: 16px;
  color: var(--muted);
  text-align: center;
}

.method-empty strong {
  color: var(--text);
  font-size: 17px;
}

.method-empty p {
  max-width: 420px;
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
}

/* 处理流程 */

.flow-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.flow-grid li {
  position: relative;
  padding: 26px 24px 28px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
}

.flow-grid li:not(:last-child)::after {
  position: absolute;
  top: 40px;
  right: -17px;
  width: 18px;
  height: 1px;
  background: linear-gradient(90deg, var(--accent), transparent);
  content: "";
}

.flow-index {
  display: inline-grid;
  width: 30px;
  height: 30px;
  place-items: center;
  margin-bottom: 20px;
  border: 1px solid rgba(91, 141, 255, 0.35);
  border-radius: 8px;
  color: var(--accent-soft);
  background: rgba(91, 141, 255, 0.08);
  font: 700 11px/1 var(--mono);
}

.flow-grid strong {
  display: block;
  font-size: 17px;
}

.flow-grid p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.8;
}

/* 接入说明 */

.start {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  align-items: start;
  gap: 56px;
  padding-bottom: 120px;
}

.start .section-head {
  margin: 0;
}

.endpoint-list {
  margin: 0;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
  list-style: none;
}

.endpoint-list li {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr) auto;
  grid-template-areas:
    "verb url copy"
    ". note copy";
  align-items: center;
  column-gap: 14px;
  row-gap: 4px;
  padding: 16px 14px;
  border-radius: 11px;
  transition: background 0.2s ease;
}

.endpoint-list li + li {
  border-top: 1px solid var(--line-soft);
}

.endpoint-list li:hover {
  background: rgba(255, 255, 255, 0.025);
}

.verb {
  grid-area: verb;
  justify-self: start;
  padding: 3px 7px;
  border-radius: 5px;
  color: var(--green);
  background: rgba(79, 209, 139, 0.1);
  font: 700 10px/1.2 var(--mono);
  letter-spacing: 0.06em;
}

.endpoint-list code {
  grid-area: url;
  overflow: hidden;
  padding: 0;
  color: var(--text);
  background: none;
  font-size: 13.5px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.endpoint-list code span {
  color: var(--dim);
}

.endpoint-note {
  grid-area: note;
  color: var(--muted);
  font-size: 12.5px;
}

.copy {
  grid-area: copy;
  height: 30px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--muted);
  background: transparent;
  font: inherit;
  font-size: 12px;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.copy:hover {
  color: var(--text);
  border-color: #3a4050;
}

.copy[data-copied] {
  color: var(--green);
  border-color: rgba(79, 209, 139, 0.4);
}

/* 页脚 */

.footer {
  border-top: 1px solid var(--line-soft);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 26px 0 30px;
  color: var(--dim);
  font: 11px/1.5 var(--mono);
  letter-spacing: 0.08em;
}

/* 动效 */

@keyframes rise-in {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: none; }
}

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes dash {
  to { stroke-dashoffset: -26; }
}

@keyframes ring {
  0% { opacity: 0.8; transform: scale(1); }
  100% { opacity: 0; transform: scale(2.1); }
}

@keyframes ping {
  75%, 100% { opacity: 0; transform: scale(2.4); }
}

@keyframes shimmer {
  to { background-position: -150% 0; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  html {
    scroll-behavior: auto;
  }
}

/* 窄屏 */

@media (max-width: 960px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 48px;
    min-height: 0;
    padding: 56px 0 24px;
  }

  .flow-grid,
  .start {
    grid-template-columns: 1fr;
  }

  .flow-grid li:not(:last-child)::after {
    display: none;
  }

  .start {
    gap: 32px;
  }
}

@media (max-width: 640px) {
  .nav-inner,
  .hero,
  .section,
  .footer-inner {
    width: calc(100% - 32px);
  }

  .nav nav {
    display: none;
  }

  .hero {
    padding-top: 40px;
  }

  .hero h1 {
    font-size: 52px;
  }

  .hero-lead {
    font-size: 15px;
  }

  .stage {
    padding: 14px 12px;
  }

  .source-chip {
    max-width: 50%;
    padding: 5px 8px;
  }

  .source-chip strong {
    font-size: 11.5px;
  }

  .source-chip small,
  .stage-node small {
    font-size: 10px;
  }

  .section {
    padding-top: 80px;
  }

  .method-card {
    min-height: 0;
  }

  .start {
    padding-bottom: 80px;
  }

  .endpoint-list li {
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas:
      "verb copy"
      "url copy"
      "note copy";
  }

  .footer-inner {
    flex-direction: column;
    gap: 6px;
  }
}