@import url("https://fonts.googleapis.com/css2?family=Syne:wght@500;600;700;800&family=Noto+Sans+SC:wght@400;500;600;700&display=swap");

:root {
  --ink: #101114;
  --ink-soft: #2a2d34;
  --muted: #6b707a;
  --line: rgba(16, 17, 20, 0.12);
  --paper: #f4f5f7;
  --white: #ffffff;
  --accent: #0f6e6a;
  --accent-deep: #0a4f4c;
  --gold: #b08d57;
  --shadow-soft: 0 24px 60px rgba(16, 17, 20, 0.08);
  --font-display: "Syne", "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --max: 1120px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  background: var(--paper);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

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

/* 备案未完成时隐藏系统入口；html[data-show-system-entry="true"] 时恢复 */
html:not([data-show-system-entry="true"]) .system-entry {
  display: none !important;
}

.site-nav {
  position: fixed;
  inset: 0 0 auto;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem clamp(1.25rem, 4vw, 3rem) 1.6rem;
  color: #fff;
  background: linear-gradient(
    180deg,
    rgba(10, 11, 14, 0.55) 0%,
    rgba(10, 11, 14, 0.18) 55%,
    rgba(10, 11, 14, 0) 100%
  );
  transition: background 0.35s ease, backdrop-filter 0.35s ease, color 0.35s ease;
  border-bottom: none;
}

.site-nav.is-solid {
  color: var(--ink);
  background: rgba(244, 245, 247, 0.92);
  backdrop-filter: blur(14px);
  border-bottom: none;
  padding-bottom: 1.1rem;
}

.brand {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.04em;
  font-size: 1.15rem;
  color: inherit;
}

.brand span {
  color: #8fd4cf;
}

.site-nav.is-solid .brand span {
  color: var(--accent);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.92);
  padding: 0.4rem 0.55rem;
}

.site-nav.is-solid .nav-link {
  color: var(--ink-soft);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0.7rem 1.35rem;
  border-radius: 0.35rem;
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.25s ease, background 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

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

.btn-primary {
  background: var(--accent);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--accent-deep);
}

.btn-ghost {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.55);
  color: var(--white);
}

.site-nav.is-solid .btn-ghost {
  border-color: var(--line);
  color: var(--ink);
}

.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  overflow: hidden;
  color: var(--white);
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.06);
  animation: heroDrift 18s ease-in-out infinite alternate;
}

.hero-shade {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(10, 11, 14, 0.42) 0%, rgba(10, 11, 14, 0.5) 40%, rgba(10, 11, 14, 0.9) 100%),
    linear-gradient(90deg, rgba(10, 11, 14, 0.55) 0%, rgba(10, 11, 14, 0.15) 58%, transparent 100%);
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: min(100% - 2.5rem, var(--max));
  margin: 0 auto;
  padding: 7.5rem 0 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero-brand {
  margin: 0 0 1.1rem;
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 8vw, 5.4rem);
  font-weight: 800;
  letter-spacing: 0.06em;
  line-height: 0.95;
}

.hero-title {
  margin: 0 0 1rem;
  max-width: 14ch;
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 3.4vw, 2.35rem);
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.25;
}

.hero-lead {
  margin: 0 0 1.85rem;
  max-width: 34rem;
  color: rgba(255, 255, 255, 0.82);
  font-size: 1.05rem;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero-slogan {
  position: relative;
  z-index: 1;
  margin: 0 auto 3.2rem;
  padding: 0 1.25rem;
  max-width: 18em;
  text-align: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.45rem, 4vw, 2.55rem);
  letter-spacing: 0.06em;
  line-height: 1.35;
  color: rgba(255, 255, 255, 0.96);
  text-shadow: 0 8px 28px rgba(0, 0, 0, 0.45);
}

.section {
  padding: clamp(4rem, 8vw, 6.5rem) 0;
}

.section-inner {
  width: min(100% - 2.5rem, var(--max));
  margin: 0 auto;
}

.section-kicker {
  margin: 0 0 0.65rem;
  color: var(--gold);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.section-title {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.2vw, 2.4rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.2;
}

.section-lead {
  margin: 0;
  max-width: 38rem;
  color: var(--muted);
  font-size: 1.02rem;
}

.feature-rail {
  margin-top: 2.75rem;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.feature-row {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: 1.25rem;
  align-items: start;
  padding: 1.55rem 0;
  border-bottom: 1px solid var(--line);
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.feature-row.is-in {
  opacity: 1;
  transform: none;
}

.feature-index {
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--gold);
  letter-spacing: 0.08em;
  padding-top: 0.2rem;
}

.feature-row h3 {
  margin: 0 0 0.4rem;
  font-size: 1.2rem;
  font-weight: 700;
}

.feature-row p {
  margin: 0;
  color: var(--muted);
  max-width: 46rem;
}

.scene-band {
  background: var(--ink);
  color: var(--white);
}

.scene-band .section-lead {
  color: rgba(255, 255, 255, 0.68);
}

.scene-grid {
  margin-top: 2.5rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem 1.5rem;
}

.scene-item {
  padding: 1.35rem 0 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.scene-item.is-in {
  opacity: 1;
  transform: none;
}

.scene-item h3 {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
}

.scene-item p {
  margin: 0;
  color: rgba(255, 255, 255, 0.68);
  font-size: 0.98rem;
}

.about {
  background:
    radial-gradient(700px 280px at 8% 0%, rgba(15, 110, 106, 0.1), transparent 60%),
    var(--paper);
}

.about-grid {
  margin-top: 2.2rem;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2rem;
  align-items: start;
}

.about-copy p {
  margin: 0 0 1rem;
  color: var(--muted);
}

.about-meta {
  display: grid;
  gap: 1rem;
  padding: 1.4rem 0 0;
  border-top: 1px solid var(--line);
}

.about-meta div {
  display: grid;
  gap: 0.2rem;
}

.about-meta dt {
  font-size: 0.82rem;
  color: var(--muted);
}

.about-meta dd {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
}

.cta-strip {
  background: linear-gradient(135deg, #0f6e6a 0%, #12343f 100%);
  color: var(--white);
}

.cta-strip .section-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  justify-content: space-between;
  gap: 1.5rem;
}

.cta-strip h2 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.1rem);
}

.cta-strip p {
  margin: 0;
  color: rgba(255, 255, 255, 0.78);
  max-width: 30rem;
}

.site-footer {
  padding: 2.2rem 0 2.6rem;
  background: #0c0d10;
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.92rem;
}

.footer-inner {
  width: min(100% - 2.5rem, var(--max));
  margin: 0 auto;
  display: grid;
  gap: 1rem;
}

.footer-brand {
  font-family: var(--font-display);
  color: var(--white);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  align-items: center;
}

.beian-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: rgba(255, 255, 255, 0.78);
}

.beian-link:hover {
  color: #fff;
}

.copy-btn {
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: transparent;
  color: rgba(255, 255, 255, 0.85);
  border-radius: 0.25rem;
  padding: 0.15rem 0.45rem;
  font-size: 0.78rem;
  cursor: pointer;
}

.copy-btn:hover {
  border-color: rgba(255, 255, 255, 0.45);
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 1.5rem;
  transform: translateX(-50%) translateY(12px);
  background: var(--ink);
  color: #fff;
  padding: 0.55rem 0.9rem;
  border-radius: 0.35rem;
  font-size: 0.88rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
  z-index: 50;
}

.toast.is-show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

@keyframes heroDrift {
  from {
    transform: scale(1.06) translate3d(0, 0, 0);
  }
  to {
    transform: scale(1.12) translate3d(-1.2%, -0.8%, 0);
  }
}

@media (max-width: 860px) {
  .scene-grid,
  .about-grid {
    grid-template-columns: 1fr;
  }

  .feature-row {
    grid-template-columns: 3rem 1fr;
  }

  .hero-inner {
    padding-top: 6.5rem;
    justify-content: flex-end;
  }

  .hero-slogan {
    margin-bottom: 2.2rem;
    max-width: 12em;
  }

  .nav-link {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero-media img {
    animation: none;
  }

  .feature-row,
  .scene-item {
    opacity: 1;
    transform: none;
    transition: none;
  }
}