:root {
  --ink: #0c1a1f;
  --ink-soft: #1a3038;
  --paper: #f3efe6;
  --paper-2: #e8e2d4;
  --sea: #0e6b6a;
  --sea-bright: #14918f;
  --coral: #e85d4c;
  --coral-deep: #c44536;
  --muted: #5c6b70;
  --line: rgba(12, 26, 31, 0.12);
  --font-display: "Syne", "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --max: 1120px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(20, 145, 143, 0.18), transparent 55%),
    radial-gradient(900px 500px at 100% 0%, rgba(232, 93, 76, 0.12), transparent 50%),
    linear-gradient(180deg, #f7f3ea 0%, var(--paper) 40%, #ebe4d6 100%);
  line-height: 1.7;
  min-height: 100vh;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(14px);
  background: rgba(243, 239, 230, 0.82);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0.9rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.brand span {
  color: var(--sea);
}

.nav {
  display: flex;
  gap: 0.35rem 1.4rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav a {
  font-size: 0.95rem;
  color: var(--muted);
  position: relative;
  padding: 0.25rem 0;
  transition: color 0.25s var(--ease);
}

.nav a:hover,
.nav a.is-active {
  color: var(--ink);
}

.nav a.is-active::after,
.nav a:hover::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--coral);
  transform-origin: left;
  animation: underlineIn 0.35s var(--ease) both;
}

@keyframes underlineIn {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: transparent;
  padding: 0.45rem 0.7rem;
  border-radius: 8px;
  font: inherit;
  cursor: pointer;
}

.hero {
  position: relative;
  min-height: min(92vh, 820px);
  display: grid;
  align-items: end;
  overflow: hidden;
  color: #f7f3ea;
}

.hero-media {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(120deg, rgba(12, 26, 31, 0.88) 12%, rgba(14, 107, 106, 0.55) 55%, rgba(12, 26, 31, 0.75) 100%),
    url("../images/hero.png") center / cover no-repeat;
  transform: scale(1.04);
  animation: heroDrift 18s ease-in-out infinite alternate;
}

.hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(
      -12deg,
      transparent,
      transparent 18px,
      rgba(255, 255, 255, 0.025) 18px,
      rgba(255, 255, 255, 0.025) 19px
    );
  pointer-events: none;
}

@keyframes heroDrift {
  from { transform: scale(1.04) translate3d(0, 0, 0); }
  to { transform: scale(1.08) translate3d(-1.5%, 1%, 0); }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: var(--max);
  width: 100%;
  margin: 0 auto;
  padding: 5.5rem 1.25rem 4.5rem;
}

.hero-brand {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 7vw, 4.6rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
  animation: riseIn 0.9s var(--ease) both;
}

.hero-lead {
  max-width: 34rem;
  font-size: clamp(1rem, 2.2vw, 1.2rem);
  color: rgba(247, 243, 234, 0.88);
  margin: 0 0 1.75rem;
  animation: riseIn 0.9s var(--ease) 0.12s both;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  animation: riseIn 0.9s var(--ease) 0.22s both;
}

@keyframes riseIn {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.35rem;
  border-radius: 999px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform 0.25s var(--ease), background 0.25s var(--ease), color 0.25s var(--ease);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--coral);
  color: #fff;
}

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

.btn-ghost {
  border-color: rgba(247, 243, 234, 0.45);
  color: #f7f3ea;
}

.btn-ghost:hover {
  background: rgba(247, 243, 234, 0.1);
}

.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 4.5rem 1.25rem;
}

.section-label {
  display: inline-block;
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--sea);
  margin-bottom: 0.75rem;
  font-weight: 600;
}

.section h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1.15;
  margin: 0 0 1rem;
}

.section-lead {
  max-width: 40rem;
  color: var(--muted);
  margin: 0 0 2rem;
  font-size: 1.05rem;
}

.prose {
  max-width: 46rem;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.prose p {
  margin: 0 0 1.1rem;
  text-indent: 0;
}

.prose p + p {
  margin-top: 1rem;
}

.feature-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
  display: grid;
  gap: 0.9rem;
}

.feature-list li {
  padding-left: 1.4rem;
  position: relative;
  color: var(--ink-soft);
}

.feature-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--sea-bright);
}

.page-hero {
  padding: 4rem 1.25rem 2rem;
  max-width: var(--max);
  margin: 0 auto;
}

.page-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.2rem);
  margin: 0.4rem 0 0.8rem;
  line-height: 1.1;
}

.contact-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin-top: 2rem;
}

.contact-item dt {
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  color: var(--sea);
  margin-bottom: 0.35rem;
  font-weight: 600;
}

.contact-item dd {
  margin: 0;
  font-size: 1.05rem;
  color: var(--ink);
}

.contact-item a {
  color: var(--coral-deep);
  border-bottom: 1px solid rgba(196, 69, 54, 0.35);
}

.age-tip {
  margin-top: 2.5rem;
  padding: 1.25rem 0 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
}

.site-footer {
  margin-top: 2rem;
  background: var(--ink);
  color: rgba(247, 243, 234, 0.78);
  padding: 2.75rem 1.25rem 2rem;
}

.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  gap: 1.75rem;
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: #f7f3ea;
  margin: 0 0 0.5rem;
}

.footer-meta {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.8;
}

.footer-beian {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  align-items: center;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(247, 243, 234, 0.12);
  font-size: 0.9rem;
}

.footer-beian a {
  color: rgba(247, 243, 234, 0.92);
  border-bottom: 1px solid rgba(232, 93, 76, 0.55);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.footer-beian a.beian-gongan {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  border-bottom-color: transparent;
}

.footer-beian a.beian-gongan img {
  width: 16px;
  height: 18px;
  flex-shrink: 0;
}

.footer-beian a:hover {
  color: #fff;
  border-color: var(--coral);
}

.footer-beian a.beian-gongan:hover {
  border-bottom-color: transparent;
}

.footer-copy {
  margin: 0;
  width: 100%;
  color: rgba(247, 243, 234, 0.55);
  font-size: 0.85rem;
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

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

@media (max-width: 760px) {
  .nav-toggle {
    display: inline-flex;
  }

  .nav {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: 0.65rem;
    padding-top: 0.5rem;
  }

  .nav.is-open {
    display: flex;
  }

  .header-inner {
    flex-wrap: wrap;
  }

  .hero-content {
    padding-top: 4.5rem;
  }
}