:root {
  --bg: #f3f6f8;
  --bg-deep: #e7eef2;
  --ink: #1a2b33;
  --muted: #5a6d76;
  --line: #c9d6dd;
  --brand: #0b6e6a;
  --brand-dark: #085752;
  --accent: #c9782c;
  --card: #ffffff;
  --shadow: 0 12px 32px rgba(26, 43, 51, 0.08);
  --radius: 14px;
  --container: 1120px;
  --font-display: "ZCOOL XiaoWei", "Noto Serif SC", serif;
  --font-body: "Noto Sans SC", "PingFang SC", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.8;
  background:
    radial-gradient(1200px 500px at 10% -10%, rgba(11, 110, 106, 0.12), transparent 60%),
    radial-gradient(900px 400px at 100% 0%, rgba(201, 120, 44, 0.1), transparent 55%),
    linear-gradient(180deg, #f7fafb 0%, var(--bg) 40%, var(--bg-deep) 100%);
  min-height: 100vh;
}

a {
  color: var(--brand);
  text-decoration: none;
}

a:hover {
  color: var(--brand-dark);
  text-decoration: underline;
}

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

.container {
  width: min(100% - 2rem, var(--container));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(10px);
  background: rgba(247, 250, 251, 0.92);
  border-bottom: 1px solid rgba(201, 214, 221, 0.85);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--ink);
  text-decoration: none;
}

.brand:hover {
  text-decoration: none;
  color: var(--ink);
}

.brand img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  object-fit: cover;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-text strong {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 400;
  letter-spacing: 0.02em;
}

.brand-text span {
  font-size: 0.75rem;
  color: var(--muted);
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.15rem;
}

.nav a {
  color: var(--ink);
  font-size: 0.95rem;
  text-decoration: none;
}

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

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 10px;
  cursor: pointer;
  color: var(--ink);
}

.nav-toggle-icon,
.nav-toggle-icon::before,
.nav-toggle-icon::after {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle-icon {
  position: relative;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle-icon::before {
  top: -6px;
}

.nav-toggle-icon::after {
  top: 6px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
  top: 0;
  transform: rotate(-45deg);
}

.hero {
  position: relative;
  min-height: clamp(420px, 78vh, 620px);
  display: grid;
  align-items: end;
  overflow: hidden;
  color: #fff;
}

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

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 28, 34, 0.25) 0%, rgba(10, 28, 34, 0.72) 55%, rgba(10, 28, 34, 0.88) 100%);
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 3.5rem 0 3rem;
}

.hero h1 {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 400;
  letter-spacing: 0.04em;
  line-height: 1.2;
}

.hero p {
  margin: 0 0 1.5rem;
  max-width: 34rem;
  font-size: 1.05rem;
  color: rgba(255, 255, 255, 0.9);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.25rem;
  border-radius: 10px;
  border: 1px solid transparent;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s ease, background 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
  text-decoration: none;
}

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

.btn-primary:hover {
  background: var(--brand-dark);
  color: #fff;
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.35);
  color: #fff;
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.22);
  color: #fff;
}

.section {
  padding: 3.2rem 0;
}

.section-head {
  margin-bottom: 1.5rem;
}

.section-head h2 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  font-weight: 400;
}

.section-head p {
  margin: 0;
  color: var(--muted);
  max-width: 42rem;
}

.grid-cats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.cat-card {
  background: var(--card);
  border: 1px solid rgba(201, 214, 221, 0.8);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.25s ease;
  text-decoration: none;
  color: inherit;
}

.cat-card:hover {
  transform: translateY(-4px);
  text-decoration: none;
  color: inherit;
}

.cat-card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.cat-card .body {
  padding: 0.9rem 1rem 1.1rem;
}

.cat-card h3 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
}

.cat-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.grid-vlog {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.vlog-item {
  background: var(--card);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid rgba(201, 214, 221, 0.75);
}

.vlog-item img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
}

.vlog-item .cap {
  padding: 0.8rem 0.9rem 1rem;
  font-size: 0.92rem;
  color: var(--muted);
}

.content-block {
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(201, 214, 221, 0.75);
  border-radius: 18px;
  padding: 1.6rem 1.5rem;
  box-shadow: var(--shadow);
}

.content-block + .content-block {
  margin-top: 1.2rem;
}

.content-block h2,
.content-block h3 {
  font-family: var(--font-display);
  font-weight: 400;
}

.content-block h2 {
  margin: 0 0 0.8rem;
  font-size: 1.7rem;
}

.content-block h3 {
  margin: 1.4rem 0 0.55rem;
  font-size: 1.25rem;
}

.content-block p {
  margin: 0 0 1rem;
  color: #33474f;
}

.content-block ul,
.content-block ol {
  margin: 0 0 1rem;
  padding-left: 1.2rem;
  color: #33474f;
}

.content-block li {
  margin-bottom: 0.4rem;
}

.two-col {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 1.2rem;
  align-items: start;
}

.feature-shot {
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.breadcrumb {
  padding: 1rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.page-hero {
  padding: 2rem 0 0.5rem;
}

.page-hero h1 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 400;
}

.page-hero p {
  margin: 0;
  color: var(--muted);
  max-width: 40rem;
}

.legal {
  padding-bottom: 3rem;
}

.toc {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 1rem 0 1.5rem;
}

.toc a {
  background: #fff;
  border: 1px solid var(--line);
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  font-size: 0.88rem;
  color: var(--ink);
  text-decoration: none;
}

.toc a:hover {
  border-color: var(--brand);
  color: var(--brand);
}

.site-footer {
  margin-top: 2rem;
  border-top: 1px solid var(--line);
  background: #13262d;
  color: rgba(255, 255, 255, 0.82);
  padding: 2.4rem 0 1.6rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 1.5rem;
}

.site-footer h3 {
  margin: 0 0 0.7rem;
  font-family: var(--font-display);
  font-weight: 400;
  color: #fff;
}

.site-footer a {
  color: rgba(255, 255, 255, 0.82);
  text-decoration: none;
}

.site-footer a:hover {
  color: #fff;
  text-decoration: underline;
}

.site-footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-footer li {
  margin-bottom: 0.4rem;
}

.footer-bottom {
  margin-top: 1.8rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.62);
}

.error-page {
  min-height: 70vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 3rem 1rem;
}

.error-page h1 {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 8vw, 4rem);
  margin: 0 0 0.6rem;
  font-weight: 400;
}

.error-page p {
  color: var(--muted);
  max-width: 28rem;
  margin: 0 auto 1.4rem;
}

.internal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1rem;
  margin-top: 0.5rem;
}

@keyframes riseIn {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-content,
.section-head,
.cat-card,
.content-block {
  animation: riseIn 0.7s ease both;
}

.cat-card:nth-child(2) { animation-delay: 0.05s; }
.cat-card:nth-child(3) { animation-delay: 0.1s; }
.cat-card:nth-child(4) { animation-delay: 0.15s; }

@media (max-width: 980px) {
  .grid-cats,
  .grid-vlog {
    grid-template-columns: repeat(2, 1fr);
  }

  .two-col,
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

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

  .nav {
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    padding: 0.5rem 0;
  }

  .nav.open {
    display: flex;
  }

  .nav a {
    padding: 0.75rem 1rem;
    border-top: 1px solid #eef3f5;
  }

  .hero {
    min-height: 70vh;
  }

  .grid-cats,
  .grid-vlog {
    grid-template-columns: 1fr;
  }

  .content-block {
    padding: 1.2rem 1rem;
  }
}