:root {
  --blue-900: #0b3d91;
  --blue-700: #1565c0;
  --blue-600: #1e88e5;
  --blue-500: #42a5f5;
  --blue-100: #e3f2fd;
  --blue-50: #f3f8ff;
  --ink: #12233a;
  --muted: #5a6b82;
  --line: #d7e3f4;
  --bg: #f7fbff;
  --white: #ffffff;
  --radius: 14px;
  --shadow: 0 12px 32px rgba(21, 101, 192, 0.12);
  --max: 1120px;
  --font-display: "Sora", "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.75;
  background:
    radial-gradient(1200px 500px at 10% -10%, rgba(66, 165, 245, 0.28), transparent 60%),
    radial-gradient(900px 420px at 100% 0%, rgba(21, 101, 192, 0.16), transparent 55%),
    linear-gradient(180deg, #eef6ff 0%, var(--bg) 32%, #ffffff 100%);
  min-height: 100vh;
}

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

a {
  color: var(--blue-700);
  text-decoration: none;
}

a:hover {
  color: var(--blue-900);
  text-decoration: underline;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(14px);
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid rgba(215, 227, 244, 0.9);
}

.nav-bar {
  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;
  font-family: var(--font-display);
  font-weight: 700;
}

.brand:hover {
  text-decoration: none;
  color: var(--blue-900);
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  object-fit: cover;
  box-shadow: 0 4px 12px rgba(21, 101, 192, 0.25);
}

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

.brand-text strong {
  font-size: 1.05rem;
}

.brand-text span {
  font-size: 0.72rem;
  color: var(--muted);
  font-weight: 500;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: var(--white);
  border-radius: 10px;
  width: 44px;
  height: 44px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
}

.nav-toggle span {
  width: 18px;
  height: 2px;
  background: var(--blue-700);
  border-radius: 2px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  display: inline-block;
  padding: 0.55rem 0.85rem;
  border-radius: 999px;
  color: var(--ink);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a.active {
  background: var(--blue-100);
  color: var(--blue-900);
}

.hero {
  padding: 3.2rem 0 2rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 2rem;
  align-items: center;
}

.hero-copy h1 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.4vw, 2.7rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.hero-copy .lead {
  margin: 0 0 1.4rem;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.85rem 1.25rem;
  border-radius: 12px;
  font-weight: 700;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--blue-600), var(--blue-900));
  color: var(--white);
  box-shadow: 0 10px 24px rgba(21, 101, 192, 0.28);
}

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

.btn-secondary {
  background: var(--white);
  color: var(--blue-700);
  border-color: var(--line);
}

.btn-secondary:hover {
  color: var(--blue-900);
  background: var(--blue-50);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.hero-meta span {
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.35rem 0.75rem;
}

.hero-visual {
  position: relative;
}

.hero-visual img {
  width: 100%;
  border-radius: 22px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(255, 255, 255, 0.7);
  animation: floatIn 0.8s ease both;
}

.hero-visual::after {
  content: "";
  position: absolute;
  inset: auto -8% -8% auto;
  width: 42%;
  height: 42%;
  background: radial-gradient(circle, rgba(66, 165, 245, 0.35), transparent 70%);
  z-index: -1;
  animation: pulseSoft 4s ease-in-out infinite;
}

@keyframes floatIn {
  from {
    opacity: 0;
    transform: translateY(18px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes pulseSoft {
  0%,
  100% {
    opacity: 0.55;
    transform: scale(1);
  }
  50% {
    opacity: 1;
    transform: scale(1.08);
  }
}

.section {
  padding: 2.6rem 0;
}

.section-head {
  margin-bottom: 1.4rem;
}

.section-head h2 {
  margin: 0 0 0.55rem;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2.4vw, 1.9rem);
  line-height: 1.3;
}

.section-head p {
  margin: 0;
  color: var(--muted);
  max-width: 720px;
}

.panel {
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.35rem 1.4rem;
  box-shadow: 0 8px 24px rgba(18, 35, 58, 0.04);
}

.panel + .panel {
  margin-top: 1rem;
}

.prose h2,
.prose h3 {
  font-family: var(--font-display);
  line-height: 1.35;
  margin-top: 1.6rem;
}

.prose h2:first-child,
.prose h3:first-child {
  margin-top: 0;
}

.prose p {
  margin: 0.85rem 0;
  color: #24364f;
}

.prose ul,
.prose ol {
  margin: 0.7rem 0 1rem;
  padding-left: 1.2rem;
}

.prose li {
  margin: 0.35rem 0;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.feature-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 8px 20px rgba(18, 35, 58, 0.04);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.feature-card img {
  width: 100%;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  object-position: top;
  background: var(--blue-50);
}

.feature-card .body {
  padding: 1rem 1.05rem 1.2rem;
}

.feature-card h3 {
  margin: 0 0 0.45rem;
  font-size: 1.05rem;
  font-family: var(--font-display);
}

.feature-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
}

.shot-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.9rem;
}

.shot-item {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}

.shot-item img {
  width: 100%;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  object-position: top;
}

.shot-item figcaption {
  padding: 0.7rem 0.8rem 0.9rem;
  font-size: 0.88rem;
  color: var(--muted);
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
  align-items: center;
}

.split img {
  border-radius: 16px;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.toc {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.7rem;
}

.toc a {
  display: block;
  padding: 0.85rem 1rem;
  background: var(--blue-50);
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--blue-900);
  font-weight: 600;
  text-decoration: none;
}

.toc a:hover {
  background: var(--blue-100);
}

.faq details {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.9rem 1rem;
  margin-bottom: 0.7rem;
}

.faq summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--blue-900);
}

.faq p {
  margin: 0.7rem 0 0.2rem;
  color: var(--muted);
}

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

.breadcrumb a {
  color: var(--blue-700);
}

.page-hero {
  padding: 1.6rem 0 0.4rem;
}

.page-hero h1 {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
}

.page-hero p {
  margin: 0;
  color: var(--muted);
  max-width: 760px;
}

.legal .panel {
  padding: 1.6rem 1.5rem 1.8rem;
}

.site-footer {
  margin-top: 2.5rem;
  padding: 2.2rem 0 2.4rem;
  background: linear-gradient(180deg, rgba(227, 242, 253, 0.35), rgba(11, 61, 145, 0.08));
  border-top: 1px solid var(--line);
}

.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-size: 1rem;
}

.site-footer p,
.site-footer li {
  color: var(--muted);
  font-size: 0.92rem;
}

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

.site-footer li {
  margin: 0.35rem 0;
}

.footer-bottom {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.86rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.2rem;
  justify-content: space-between;
}

.error-page {
  min-height: 70vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 3rem 0;
}

.error-page h1 {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 4rem);
  color: var(--blue-900);
}

.error-page p {
  margin: 0 0 1.2rem;
  color: var(--muted);
}

.related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.related-links a {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.45rem 0.85rem;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
}

.related-links a:hover {
  background: var(--blue-100);
}

@media (max-width: 960px) {
  .hero-grid,
  .split,
  .footer-grid {
    grid-template-columns: 1fr;
  }

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

  .shot-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.page-scroll {
  display: block;
}

@media (max-width: 760px) {
  html,
  body {
    height: 100%;
    overflow: hidden;
  }

  body {
    display: flex;
    flex-direction: column;
    min-height: 100%;
    max-height: 100%;
  }

  .site-header {
    position: relative;
    top: auto;
    flex-shrink: 0;
    z-index: 100;
  }

  #site-ads-wrap {
    position: relative !important;
    top: auto !important;
    flex-shrink: 0;
    z-index: 90;
  }

  .page-scroll {
    flex: 1 1 auto;
    min-height: 0;
    overflow-x: hidden;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav-links {
    position: absolute;
    left: 1rem;
    right: 1rem;
    top: 68px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    background: rgba(255, 255, 255, 0.98);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 0.55rem;
    box-shadow: var(--shadow);
    z-index: 120;
  }

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

  .nav-links a {
    border-radius: 10px;
  }

  .hero {
    padding-top: 1.8rem;
  }

  .feature-grid,
  .shot-grid,
  .toc {
    grid-template-columns: 1fr;
  }

  .feature-card img,
  .shot-item img,
  .hero-visual img,
  .split img {
    aspect-ratio: 3 / 4;
  }
}