:root {
  --sea-950: #082640;
  --sea-900: #0d3f67;
  --sea-700: #1b6ea2;
  --sea-500: #34a6dc;
  --sun: #ff9f43;
  --sand: #ffe0a9;
  --foam: #e9f8ff;
  --ink: #10263d;
  --muted: #5e7690;
  --card-bg: rgba(255, 255, 255, 0.76);
  --card-border: rgba(13, 63, 103, 0.18);
  --shadow: 0 16px 40px rgba(6, 54, 92, 0.14);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 16% 20%, rgba(255, 214, 142, 0.52), transparent 32%),
    radial-gradient(circle at 87% 12%, rgba(121, 211, 255, 0.42), transparent 30%),
    linear-gradient(165deg, #d5f0ff 0%, #8fd3fb 40%, #63b8e8 100%);
  min-height: 100vh;
  line-height: 1.6;
}

code {
  font-family: "Consolas", "SFMono-Regular", monospace;
}

.grain {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 3px 3px;
  opacity: 0.35;
}

.container {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(224, 245, 255, 0.72);
  border-bottom: 1px solid rgba(9, 73, 118, 0.1);
}

.topbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--sea-950);
  text-decoration: none;
}

.brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 700;
  background: linear-gradient(135deg, var(--sea-700), var(--sea-500));
  box-shadow: 0 8px 18px rgba(26, 98, 146, 0.32);
}

.brand-text {
  font-family: "ZCOOL XiaoWei", "STKaiti", serif;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.6px;
}

.topnav {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.topnav a {
  text-decoration: none;
  color: #35526d;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.45rem 0.75rem;
  border-radius: 999px;
  transition: all 180ms ease;
}

.topnav a:hover,
.topnav a.is-current {
  color: #0f4b76;
  background: rgba(17, 130, 187, 0.14);
}

main {
  position: relative;
  z-index: 1;
}

.section {
  padding: 76px 0;
}

.hero {
  padding-top: 44px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 28px;
  align-items: center;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  border-radius: 999px;
  color: #104f79;
  background: rgba(232, 249, 255, 0.9);
  border: 1px solid rgba(38, 143, 198, 0.22);
  font-size: 0.78rem;
  font-weight: 700;
}

.hero h1 {
  margin: 0;
  font-family: "ZCOOL XiaoWei", "STKaiti", serif;
  font-size: clamp(2rem, 4.8vw, 3.45rem);
  line-height: 1.2;
  color: #092b46;
}

.hero p {
  margin: 18px 0 0;
  max-width: 62ch;
  color: #345673;
  font-size: 1.02rem;
}

.hero p code {
  color: #0f5788;
  background: rgba(231, 248, 255, 0.92);
  border-radius: 8px;
  padding: 2px 6px;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.cta-row.center {
  justify-content: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  border-radius: 12px;
  padding: 11px 18px;
  font-weight: 700;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: transform 180ms ease, background 180ms ease, color 180ms ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--sea-700), var(--sea-500));
  color: #fff;
  box-shadow: 0 10px 20px rgba(18, 110, 163, 0.3);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.7);
  color: #0f4d79;
  border-color: rgba(18, 100, 151, 0.25);
}

.metric-grid {
  margin-top: 26px;
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.metric {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 14px;
  box-shadow: var(--shadow);
}

.metric strong {
  display: block;
  font-size: clamp(1.3rem, 2.4vw, 2rem);
  line-height: 1.1;
  color: #0c527e;
}

.metric span {
  font-size: 0.84rem;
  color: var(--muted);
}

.repo-meta {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.repo-meta li {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 12px;
}

.meta-label {
  display: block;
  color: var(--muted);
  font-size: 0.75rem;
}

.repo-meta strong {
  display: block;
  margin-top: 4px;
  font-size: 0.93rem;
  color: #0e4b74;
}

.hero-visual {
  width: 100%;
}

.mockup {
  position: relative;
  min-height: 520px;
  padding: 26px;
  border-radius: 30px;
  background:
    radial-gradient(circle at 18% 14%, rgba(255, 255, 255, 0.2), transparent 33%),
    linear-gradient(180deg, #1a719f 0%, #0f3459 100%);
  box-shadow: 0 26px 60px rgba(5, 48, 82, 0.35);
  overflow: hidden;
}

.wave {
  position: absolute;
  left: -14%;
  width: 128%;
  border-radius: 48%;
  background: rgba(255, 255, 255, 0.14);
  animation: waveMove 10s linear infinite;
}

.wave-a {
  height: 140px;
  bottom: 32%;
}

.wave-b {
  height: 160px;
  bottom: 26%;
  opacity: 0.45;
  animation-duration: 14s;
}

.floating-layer {
  position: absolute;
  inset: 0;
}

.floating-bottle {
  position: absolute;
  font-size: 2rem;
  filter: drop-shadow(0 6px 10px rgba(0, 0, 0, 0.26));
  animation: bottleDrift 7.5s ease-in-out infinite;
}

.floating-bottle.b1 {
  left: 12%;
  top: 18%;
}

.floating-bottle.b2 {
  left: 74%;
  top: 22%;
  animation-delay: -1.4s;
}

.floating-bottle.b3 {
  left: 30%;
  top: 38%;
  animation-delay: -3.2s;
}

.floating-bottle.b4 {
  left: 68%;
  top: 44%;
  animation-delay: -4.7s;
}

.mockup-card {
  position: relative;
  z-index: 1;
  margin-top: 12px;
  background: rgba(236, 248, 255, 0.92);
  border: 1px solid rgba(174, 226, 251, 0.8);
  border-radius: 16px;
  padding: 14px 16px;
}

.mockup-card h3 {
  margin: 0;
  color: #0e4f7d;
  font-size: 1rem;
}

.mockup-card p {
  margin: 6px 0 0;
  color: #406581;
  font-size: 0.9rem;
}

.section-head {
  margin-bottom: 20px;
}

.section-head h2 {
  margin: 4px 0 0;
  font-family: "ZCOOL XiaoWei", "STKaiti", serif;
  font-size: clamp(1.55rem, 3.3vw, 2.4rem);
  line-height: 1.35;
  color: #0d2f4d;
}

.eyebrow {
  margin: 0;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #1770a7;
  font-weight: 800;
}

.feature-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  padding: 20px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
}

.card h3 {
  margin: 0;
  color: #0e4d79;
  font-size: 1.06rem;
}

.card p {
  margin: 8px 0 0;
  color: #4a657f;
  font-size: 0.95rem;
}

.flow-list {
  display: grid;
  gap: 12px;
}

.flow-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 18px;
  padding: 16px;
  box-shadow: var(--shadow);
}

.flow-num {
  width: 32px;
  height: 32px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  color: #fff;
  font-size: 0.92rem;
  font-weight: 800;
  background: linear-gradient(145deg, #1f91cb, #16608f);
}

.flow-item h3 {
  margin: 0;
  color: #0e4f7d;
  font-size: 1rem;
}

.flow-item p {
  margin: 6px 0 0;
  color: #4e6d86;
  font-size: 0.93rem;
}

.flow-item code {
  color: #0f5685;
  background: rgba(222, 243, 255, 0.92);
  border-radius: 8px;
  padding: 2px 6px;
}

.architecture-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.clean-list {
  margin: 10px 0 0;
  padding-left: 20px;
}

.clean-list li {
  margin: 8px 0;
  color: #4d687f;
  font-size: 0.94rem;
}

.clean-list code {
  color: #0f5889;
}

.code-card {
  grid-column: 1 / -1;
}

.code-card pre {
  margin: 10px 0 0;
  background: #0e2f4c;
  color: #dbf5ff;
  border-radius: 14px;
  padding: 16px;
  overflow-x: auto;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.code-card code {
  font-size: 0.88rem;
  line-height: 1.6;
}

.api-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}

.api-tab {
  border: 1px solid rgba(19, 99, 150, 0.25);
  color: #1a5f8e;
  background: rgba(235, 250, 255, 0.74);
  border-radius: 999px;
  padding: 8px 14px;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 160ms ease;
}

.api-tab.is-active,
.api-tab:hover {
  color: #fff;
  background: linear-gradient(135deg, #1b80b8, #1aa6d6);
  border-color: transparent;
}

.api-panel {
  display: none;
}

.api-panel.is-active {
  display: block;
}

.endpoint-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.endpoint-list li {
  display: grid;
  gap: 6px;
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid rgba(13, 85, 133, 0.2);
  background: rgba(255, 255, 255, 0.68);
  box-shadow: var(--shadow);
}

.endpoint-list code {
  width: max-content;
  max-width: 100%;
  font-size: 0.84rem;
  padding: 3px 8px;
  border-radius: 999px;
  color: #0d4972;
  background: rgba(224, 244, 255, 0.95);
  overflow: auto;
}

.endpoint-list span {
  color: #4a667f;
  font-size: 0.92rem;
}

.roadmap-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.roadmap-item {
  border-top: 4px solid rgba(26, 142, 196, 0.5);
}

.cta-section {
  text-align: center;
  background:
    radial-gradient(circle at 15% 20%, rgba(255, 232, 186, 0.6), transparent 36%),
    linear-gradient(140deg, rgba(239, 250, 255, 0.92), rgba(214, 240, 255, 0.92));
  border: 1px solid rgba(14, 90, 138, 0.2);
  border-radius: 30px;
  box-shadow: var(--shadow);
  padding: 42px 18px;
}

.cta-section h2 {
  margin: 0;
  font-family: "ZCOOL XiaoWei", "STKaiti", serif;
  font-size: clamp(1.6rem, 3.4vw, 2.3rem);
  color: #0d385c;
}

.cta-section p {
  margin: 10px auto 0;
  max-width: 64ch;
  color: #4a6780;
}

.footer {
  position: relative;
  z-index: 1;
  padding: 24px 0 30px;
  color: #2f5673;
  font-size: 0.88rem;
  text-align: center;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 640ms ease, transform 640ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes waveMove {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-24%);
  }
}

@keyframes bottleDrift {
  0%,
  100% {
    transform: translate(0, 0) rotate(-4deg);
  }
  25% {
    transform: translate(14px, -10px) rotate(2deg);
  }
  50% {
    transform: translate(-8px, -16px) rotate(6deg);
  }
  75% {
    transform: translate(-14px, -6px) rotate(-1deg);
  }
}

@media (max-width: 980px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .mockup {
    min-height: 420px;
  }

  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .roadmap-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .topbar .container {
    align-items: flex-start;
    flex-direction: column;
  }

  .section {
    padding: 56px 0;
  }

  .metric-grid,
  .repo-meta {
    grid-template-columns: 1fr;
  }

  .feature-grid,
  .architecture-grid,
  .roadmap-grid {
    grid-template-columns: 1fr;
  }

  .endpoint-list code {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}