:root {
  --blue-deep: #0b4fd9;
  --blue: #1a6bff;
  --blue-soft: #e8f1ff;
  --blue-mid: #4d8dff;
  --ink: #132238;
  --muted: #5a6b7d;
  --line: #d7e3f4;
  --bg: #f3f7fd;
  --white: #ffffff;
  --accent: #00c2b8;
  --radius: 14px;
  --shadow: 0 12px 32px rgba(19, 58, 128, 0.08);
  --max: 1120px;
  --font: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --display: "Trebuchet MS", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 10% -10%, #d9e9ff 0%, transparent 55%),
    radial-gradient(900px 420px at 100% 0%, #c9fff8 0%, transparent 50%),
    linear-gradient(180deg, #eef5ff 0%, var(--bg) 38%, #f7faff 100%);
  line-height: 1.75;
}

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

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

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid rgba(215, 227, 244, 0.9);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--ink);
  text-decoration: none;
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.15rem;
}

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

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  object-fit: cover;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.35rem 1.1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--ink);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
}

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

.menu-toggle {
  display: none;
  border: 1px solid var(--line);
  background: var(--white);
  border-radius: 10px;
  padding: 0.45rem 0.7rem;
  font-weight: 700;
  color: var(--ink);
  cursor: pointer;
}

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

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2rem;
  align-items: center;
}

.eyebrow {
  display: inline-block;
  color: var(--blue-deep);
  background: var(--blue-soft);
  border: 1px solid #c9dbff;
  border-radius: 999px;
  padding: 0.25rem 0.8rem;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 0.9rem;
}

.hero h1 {
  margin: 0 0 0.9rem;
  font-family: var(--display);
  font-size: clamp(1.8rem, 3.4vw, 2.7rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.hero-lead {
  margin: 0 0 1.4rem;
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 36rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-bottom: 1.2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  border-radius: 12px;
  padding: 0.78rem 1.25rem;
  font-weight: 700;
  border: 1px solid transparent;
  text-decoration: none;
  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) 0%, var(--blue-deep) 100%);
  color: var(--white);
  box-shadow: 0 10px 24px rgba(26, 107, 255, 0.28);
}

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

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

.btn-ghost:hover {
  color: var(--blue);
  border-color: #aec8ef;
}

.hero-meta {
  color: var(--muted);
  font-size: 0.92rem;
}

.hero-visual {
  position: relative;
}

.hero-visual::before {
  content: "";
  position: absolute;
  inset: 8% -4% -4% 8%;
  background: linear-gradient(145deg, rgba(26, 107, 255, 0.18), rgba(0, 194, 184, 0.16));
  border-radius: 28px;
  z-index: 0;
  animation: drift 7s ease-in-out infinite alternate;
}

.hero-visual img {
  position: relative;
  z-index: 1;
  border-radius: 22px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(255, 255, 255, 0.7);
}

@keyframes drift {
  from { transform: translateY(0); }
  to { transform: translateY(8px); }
}

.section {
  padding: 2.6rem 0;
}

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

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

.section-head p {
  margin: 0;
  color: var(--muted);
  max-width: 48rem;
}

.panel {
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.35rem;
}

.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(19, 58, 128, 0.05);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 28px rgba(19, 58, 128, 0.1);
}

.feature-card img {
  width: 100%;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  object-position: top;
  background: #e9f0fa;
}

.feature-card .body {
  padding: 1rem 1.05rem 1.15rem;
}

.feature-card h3 {
  margin: 0 0 0.45rem;
  font-size: 1.05rem;
}

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

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
  align-items: start;
}

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

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

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

.prose h2 {
  margin: 1.8rem 0 0.75rem;
  font-size: 1.45rem;
}

.prose h3 {
  margin: 1.35rem 0 0.55rem;
  font-size: 1.15rem;
}

.prose p {
  margin: 0 0 1rem;
  color: #243447;
}

.prose ul,
.prose ol {
  margin: 0 0 1rem;
  padding-left: 1.2rem;
  color: #243447;
}

.prose li {
  margin-bottom: 0.4rem;
}

.toc {
  background: linear-gradient(180deg, #f8fbff, #eef5ff);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.1rem 1.2rem;
  margin: 1.2rem 0 1.6rem;
}

.toc strong {
  display: block;
  margin-bottom: 0.55rem;
}

.toc ol {
  margin: 0;
  padding-left: 1.15rem;
}

.toc a {
  font-weight: 600;
}

.steps {
  display: grid;
  gap: 0.9rem;
  counter-reset: step;
}

.step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.9rem;
  align-items: start;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem;
}

.step::before {
  counter-increment: step;
  content: counter(step);
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--blue);
  color: #fff;
  font-weight: 800;
}

.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;
}

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

.page-hero {
  padding: 2.4rem 0 1.2rem;
}

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

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

.breadcrumb {
  margin-bottom: 0.8rem;
  color: var(--muted);
  font-size: 0.9rem;
}

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

.legal .panel {
  padding: 1.5rem 1.4rem 1.7rem;
}

.site-footer {
  margin-top: 2.5rem;
  border-top: 1px solid var(--line);
  background: #0f2748;
  color: #d7e4f8;
  padding: 2.2rem 0 1.5rem;
}

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

.site-footer a {
  color: #d7e4f8;
}

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

.site-footer h3 {
  margin: 0 0 0.7rem;
  font-size: 1rem;
  color: #fff;
}

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

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

.footer-brand {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  margin-bottom: 0.8rem;
}

.footer-brand img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
}

.copyright {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  color: #9db2ce;
  font-size: 0.9rem;
}

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

.error-wrap h1 {
  margin: 0 0 0.6rem;
  font-size: clamp(2rem, 6vw, 3.4rem);
  font-family: var(--display);
}

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

.related {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1rem;
}

.related a {
  background: var(--blue-soft);
  border: 1px solid #c9dbff;
  border-radius: 999px;
  padding: 0.35rem 0.8rem;
  font-size: 0.88rem;
  font-weight: 600;
  text-decoration: none;
}

.media-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.8rem;
  margin: 1rem 0 1.4rem;
}

.media-row .shot img {
  aspect-ratio: 9 / 16;
}

.anchor-offset {
  scroll-margin-top: 88px;
}

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

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

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

@media (max-width: 720px) {
  .menu-toggle {
    display: inline-flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    left: 1rem;
    right: 1rem;
    top: 68px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 0.7rem;
    flex-direction: column;
    align-items: stretch;
    box-shadow: var(--shadow);
  }

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

  .nav-links a {
    padding: 0.65rem 0.7rem;
    border-radius: 8px;
  }

  .nav-links a:hover {
    background: var(--blue-soft);
    text-decoration: none;
  }

  .feature-grid,
  .media-row {
    grid-template-columns: 1fr 1fr;
  }

  .hero {
    padding-top: 1.8rem;
  }

  .section {
    padding: 1.8rem 0;
  }
}

@media (max-width: 420px) {
  .feature-grid,
  .media-row {
    grid-template-columns: 1fr;
  }
}