:root {
  --blue: #1a8cff;
  --blue-deep: #0b5fd4;
  --blue-dark: #0a2a5c;
  --cyan: #2ec7ff;
  --bg: #f4f8fc;
  --card: #ffffff;
  --text: #1a2332;
  --muted: #5a6b7d;
  --line: #d8e4f0;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(11, 95, 212, 0.08);
  --max: 1120px;
  --font: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(1200px 500px at 10% -10%, rgba(46, 199, 255, 0.18), transparent 60%),
    radial-gradient(900px 400px at 100% 0%, rgba(26, 140, 255, 0.14), transparent 55%),
    linear-gradient(180deg, #eef6ff 0%, var(--bg) 280px, #f7fafc 100%);
  line-height: 1.75;
  min-height: 100vh;
  padding-top: 68px;
}

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

#ads img {
  max-width: none;
  height: 65px;
}

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

a:hover {
  text-decoration: underline;
}

.container {
  width: min(100% - 32px, var(--max));
  margin-inline: auto;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid rgba(216, 228, 240, 0.9);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--blue-dark);
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px 18px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  padding: 6px 2px;
}

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

.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 16px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--cyan), var(--blue));
  color: #fff !important;
  font-weight: 600;
  text-decoration: none !important;
  box-shadow: 0 6px 16px rgba(26, 140, 255, 0.28);
}

.menu-toggle {
  display: none;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 10px;
  width: 42px;
  height: 42px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
}

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

/* Hero */
.hero {
  padding: 48px 0 28px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 36px;
  align-items: center;
}

.eyebrow {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(26, 140, 255, 0.1);
  color: var(--blue-deep);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 14px;
}

.hero h1 {
  margin: 0 0 14px;
  font-size: clamp(1.7rem, 3.2vw, 2.45rem);
  line-height: 1.25;
  color: var(--blue-dark);
  letter-spacing: -0.02em;
}

.hero-lead {
  margin: 0 0 22px;
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 36em;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 18px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 12px;
  font-weight: 700;
  text-decoration: none !important;
  border: none;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--cyan), var(--blue-deep));
  color: #fff;
  box-shadow: 0 10px 24px rgba(11, 95, 212, 0.28);
}

.btn-secondary {
  background: #fff;
  color: var(--blue-deep);
  border: 1px solid var(--line);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  color: var(--muted);
  font-size: 0.9rem;
}

.hero-visual {
  position: relative;
}

.phone-frame {
  background: var(--card);
  border-radius: 24px;
  padding: 12px;
  box-shadow: var(--shadow);
  border: 1px solid var(--line);
  overflow: hidden;
}

.phone-frame img {
  width: 100%;
  border-radius: 16px;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  object-position: top;
  max-height: 520px;
}

/* Sections */
.section {
  padding: 42px 0;
}

.section-head {
  margin-bottom: 24px;
}

.section-head h2 {
  margin: 0 0 8px;
  font-size: clamp(1.35rem, 2.4vw, 1.85rem);
  color: var(--blue-dark);
}

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

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

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

.feature-card img {
  width: 100%;
  aspect-ratio: 9 / 14;
  object-fit: cover;
  object-position: top;
  background: #e8f1fa;
}

.feature-card .body {
  padding: 16px 16px 18px;
}

.feature-card h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
  color: var(--blue-dark);
}

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

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  align-items: center;
}

.two-col.reverse .text {
  order: 2;
}

.two-col.reverse .media {
  order: 1;
}

.media {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px;
  box-shadow: var(--shadow);
}

.media img {
  width: 100%;
  border-radius: 10px;
  aspect-ratio: 9 / 15;
  object-fit: cover;
  object-position: top;
  max-height: 560px;
  margin-inline: auto;
}

.prose h2,
.prose h3 {
  color: var(--blue-dark);
  scroll-margin-top: 88px;
}

.prose h2 {
  margin: 1.6em 0 0.55em;
  font-size: 1.45rem;
}

.prose h3 {
  margin: 1.35em 0 0.45em;
  font-size: 1.15rem;
}

.prose p {
  margin: 0 0 1em;
  color: #2a3646;
}

.prose ul,
.prose ol {
  margin: 0 0 1.1em;
  padding-left: 1.25em;
  color: #2a3646;
}

.prose li {
  margin-bottom: 0.45em;
}

.prose a {
  font-weight: 600;
}

.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 22px 8px;
  box-shadow: var(--shadow);
}

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.step {
  background: linear-gradient(180deg, #fff, #f3f9ff);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
}

.step .num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--blue);
  color: #fff;
  font-weight: 700;
  font-size: 0.85rem;
  margin-bottom: 10px;
}

.step h3 {
  margin: 0 0 6px;
  font-size: 1rem;
}

.step p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.faq details {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 16px;
  margin-bottom: 10px;
}

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

.faq details p {
  margin: 10px 0 0;
  color: var(--muted);
}

.download-box {
  background: linear-gradient(135deg, #0b5fd4, #1a8cff 45%, #2ec7ff);
  color: #fff;
  border-radius: 18px;
  padding: 28px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 20px;
  align-items: center;
  box-shadow: 0 16px 36px rgba(11, 95, 212, 0.28);
}

.download-box h2 {
  margin: 0 0 8px;
  color: #fff;
}

.download-box p {
  margin: 0 0 16px;
  color: rgba(255, 255, 255, 0.92);
}

.download-box .btn-secondary {
  border: none;
}

.shot-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.shot-row img {
  border-radius: 12px;
  border: 1px solid var(--line);
  aspect-ratio: 9 / 16;
  object-fit: cover;
  object-position: top;
  background: #fff;
}

.toc {
  background: #f0f7ff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 18px;
  margin: 0 0 22px;
}

.toc strong {
  display: block;
  margin-bottom: 8px;
  color: var(--blue-dark);
}

.toc a {
  display: inline-block;
  margin: 0 12px 6px 0;
}

.page-hero {
  padding: 36px 0 10px;
}

.page-hero h1 {
  margin: 0 0 10px;
  font-size: clamp(1.5rem, 2.8vw, 2rem);
  color: var(--blue-dark);
}

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

.legal {
  padding-bottom: 48px;
}

.legal .panel {
  padding: 28px 28px 18px;
}

.error-page {
  min-height: 70vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 60px 16px;
}

.error-page h1 {
  font-size: 4rem;
  margin: 0;
  color: var(--blue);
  line-height: 1;
}

.error-page h2 {
  margin: 12px 0;
  color: var(--blue-dark);
}

.error-page p {
  color: var(--muted);
  margin: 0 0 20px;
}

/* Footer */
.site-footer {
  margin-top: 40px;
  background: var(--blue-dark);
  color: rgba(255, 255, 255, 0.86);
  padding: 36px 0 22px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 24px;
  margin-bottom: 24px;
}

.site-footer h3 {
  margin: 0 0 12px;
  color: #fff;
  font-size: 1rem;
}

.site-footer p {
  margin: 0;
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.92rem;
}

.site-footer a {
  color: rgba(255, 255, 255, 0.86);
  display: block;
  margin-bottom: 8px;
  text-decoration: none;
  font-size: 0.92rem;
}

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

.copyright {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 16px;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.65);
}

.breadcrumb {
  font-size: 0.88rem;
  color: var(--muted);
  margin-bottom: 12px;
}

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

.keyword-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.keyword-tags span {
  background: #eaf4ff;
  color: var(--blue-deep);
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 0.8rem;
}

@media (max-width: 960px) {
  .hero-grid,
  .two-col,
  .two-col.reverse,
  .download-box,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .two-col.reverse .text,
  .two-col.reverse .media {
    order: initial;
  }

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

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

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

  .phone-frame img,
  .media img {
    max-height: 460px;
  }
}

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

  .nav-links {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: stretch;
    padding: 12px 16px 16px;
    gap: 4px;
  }

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

  .nav-links a {
    padding: 12px 10px;
    border-radius: 8px;
  }

  .nav-links a:hover {
    background: #f0f7ff;
  }

  .nav-cta {
    margin-top: 6px;
    width: 100%;
  }

  .card-grid,
  .steps,
  .shot-row {
    grid-template-columns: 1fr 1fr;
  }

  .hero {
    padding-top: 28px;
  }

  .section {
    padding: 30px 0;
  }

  .legal .panel {
    padding: 18px 16px 8px;
  }
}

@media (max-width: 480px) {
  .card-grid,
  .steps {
    grid-template-columns: 1fr;
  }

  .shot-row {
    grid-template-columns: 1fr 1fr;
  }
}