*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --brand: #2563eb;
  --brand-dark: #1d4ed8;
  --brand-light: #3b82f6;
  --ink: #0f172a;
  --ink-soft: #334155;
  --muted: #64748b;
  --line: #e2e8f0;
  --surface: #ffffff;
  --surface-alt: #eff6ff;
  --sky: #eff6ff;
  --grad: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  --shadow: 0 8px 30px rgba(37, 99, 235, 0.12);
  --radius: 14px;
  --font-display: "Outfit", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--sky);
  color: var(--ink);
  line-height: 1.75;
  font-size: 16px;
  background-image:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(37, 99, 235, 0.14), transparent),
    radial-gradient(ellipse 60% 40% at 100% 0%, rgba(29, 78, 216, 0.1), transparent),
    linear-gradient(180deg, #eff6ff 0%, #f8fafc 40%, #eff6ff 100%);
  min-height: 100vh;
}

a { color: var(--brand-dark); text-decoration: none; transition: color .2s; }
a:hover { color: var(--brand-light); }
img { max-width: 100%; height: auto; }

.container { max-width: 1100px; margin: 0 auto; padding: 0 22px; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.02em;
}

.logo img { width: 34px; height: 34px; border-radius: 8px; }

.nav-links { display: flex; gap: 28px; list-style: none; }
.nav-links a { color: var(--muted); font-size: .95rem; font-weight: 500; }
.nav-links a:hover,
.nav-links a.active { color: var(--brand-dark); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: .95rem;
  border: none;
  cursor: pointer;
  transition: transform .25s ease, box-shadow .25s ease, background .2s;
  font-family: inherit;
}

.btn-primary {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(37, 99, 235, 0.45);
  color: #fff;
}

.btn-outline {
  background: transparent;
  color: var(--brand-dark);
  border: 1.5px solid var(--brand);
}

.btn-outline:hover {
  background: rgba(37, 99, 235, 0.08);
  color: var(--brand-dark);
}

.btn-sm { padding: 8px 18px; font-size: .875rem; }
.btn-lg { padding: 14px 32px; font-size: 1rem; }

/* Hero */
.hero {
  padding: 88px 0 72px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 10% 15% auto;
  height: 280px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.18), transparent 70%);
  pointer-events: none;
  animation: pulseGlow 6s ease-in-out infinite;
}

@keyframes pulseGlow {
  0%, 100% { opacity: 0.7; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.08); }
}

.hero-brand {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 7vw, 4.2rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 18px;
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: fadeUp 0.7s ease both;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3.2vw, 1.85rem);
  font-weight: 600;
  color: var(--ink-soft);
  margin-bottom: 16px;
  animation: fadeUp 0.7s ease 0.12s both;
}

.hero-sub {
  font-size: 1.08rem;
  color: var(--muted);
  max-width: 560px;
  margin: 0 auto 36px;
  animation: fadeUp 0.7s ease 0.22s both;
}

.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeUp 0.7s ease 0.32s both;
}

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

/* Sections */
.section { padding: 72px 0; }
.section-alt { background: rgba(255, 255, 255, 0.65); }

.section-title {
  font-family: var(--font-display);
  text-align: center;
  font-size: clamp(1.5rem, 3vw, 1.9rem);
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -0.02em;
}

.section-desc {
  text-align: center;
  color: var(--muted);
  max-width: 580px;
  margin: 0 auto 44px;
}

/* Features */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-block { text-align: center; padding: 8px 12px; }

.feature-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 18px;
  border-radius: 16px;
  background: var(--grad);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.45rem;
  box-shadow: var(--shadow);
}

.feature-block h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin-bottom: 10px;
}

.feature-block p { color: var(--muted); font-size: .95rem; }

/* Platforms */
.platform-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
}

.platform-chip {
  padding: 12px 28px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-weight: 600;
  color: var(--ink-soft);
  box-shadow: 0 2px 10px rgba(15, 23, 42, 0.04);
  transition: transform .2s, border-color .2s;
}

.platform-chip:hover {
  transform: translateY(-2px);
  border-color: var(--brand-light);
}

/* Advantage */
.advantage-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.advantage-item {
  padding: 28px 24px;
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  transition: transform .25s, box-shadow .25s;
}

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

.advantage-item h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin-bottom: 10px;
  color: var(--brand-dark);
}

.advantage-item p { color: var(--muted); font-size: .94rem; }

/* Reviews */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.review-card {
  padding: 26px 24px;
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.review-text {
  color: var(--ink-soft);
  font-size: .95rem;
  margin-bottom: 18px;
  font-style: italic;
}

.review-author {
  font-weight: 600;
  font-size: .9rem;
  color: var(--muted);
}

/* Daily update */
.daily-panel {
  max-width: 780px;
  margin: 0 auto;
  padding: 28px 30px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.daily-panel h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.update-date {
  color: var(--brand);
  font-size: .85rem;
  margin-bottom: 12px;
}

.daily-panel p { color: var(--muted); }

.articles-list { display: flex; flex-direction: column; gap: 18px; }

.article-item {
  display: flex;
  gap: 20px;
  padding: 22px 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color .2s, box-shadow .2s;
}

.article-item:hover {
  border-color: var(--brand-light);
  box-shadow: var(--shadow);
}

.article-date {
  flex-shrink: 0;
  color: var(--muted);
  font-size: .85rem;
  min-width: 100px;
}

.article-body h3 { font-size: 1.05rem; margin-bottom: 8px; }
.article-body h3 a { color: var(--ink); }
.article-body h3 a:hover { color: var(--brand-dark); }
.article-excerpt { color: var(--muted); font-size: .9rem; }
.read-more { font-size: .875rem; margin-top: 8px; display: inline-block; }

/* FAQ */
.faq-list { max-width: 780px; margin: 0 auto; }

.faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  background: var(--surface);
}

.faq-question {
  width: 100%;
  background: var(--surface);
  border: none;
  color: var(--ink);
  text-align: left;
  padding: 18px 24px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: inherit;
}

.faq-question::after {
  content: "+";
  font-size: 1.25rem;
  color: var(--brand);
  flex-shrink: 0;
  margin-left: 12px;
}

.faq-item.open .faq-question::after { content: "−"; }

.faq-answer {
  display: none;
  padding: 0 24px 18px;
  color: var(--muted);
  font-size: .94rem;
}

.faq-item.open .faq-answer { display: block; }

/* CTA */
.cta-section {
  text-align: center;
  padding: 72px 0;
}

.cta-section h2 {
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3vw, 1.7rem);
  margin-bottom: 24px;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 44px 0 28px;
  background: rgba(255, 255, 255, 0.8);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-bottom: 32px;
}

.footer-col h4 {
  font-family: var(--font-display);
  font-size: .95rem;
  margin-bottom: 14px;
}

.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 8px; }
.footer-col a { color: var(--muted); font-size: .875rem; }
.footer-col p { color: var(--muted); font-size: .875rem; }

.footer-bottom {
  text-align: center;
  color: var(--muted);
  font-size: .8rem;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

/* Download */
.download-hero { padding: 64px 0 36px; text-align: center; }
.download-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 4vw, 2.3rem);
  margin-bottom: 12px;
}
.download-hero p { color: var(--muted); max-width: 560px; margin: 0 auto; }

.platform-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 22px;
}

.platform-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 22px;
  text-align: center;
  transition: transform .2s, box-shadow .2s;
}

.platform-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.platform-icon { font-size: 2.2rem; margin-bottom: 14px; }
.platform-card h3 { margin-bottom: 8px; font-family: var(--font-display); }
.platform-card p { color: var(--muted); font-size: .875rem; margin-bottom: 18px; }

.steps-section { max-width: 700px; margin: 0 auto; }

.step-item {
  display: flex;
  gap: 18px;
  margin-bottom: 26px;
}

.step-num {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--grad);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: .9rem;
}

.step-content h3 { font-size: 1rem; margin-bottom: 6px; }
.step-content p { color: var(--muted); font-size: .925rem; }

/* Article */
.article-page { padding: 48px 0 64px; }
.article-page .container { max-width: 760px; }

.article-header { margin-bottom: 32px; }
.article-header h1 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.5vw, 1.9rem);
  line-height: 1.35;
  margin-bottom: 12px;
}
.article-meta { color: var(--muted); font-size: .875rem; }

.article-content h2 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  margin: 32px 0 14px;
}
.article-content p { color: var(--ink-soft); margin-bottom: 16px; }
.article-content ul, .article-content ol {
  color: var(--ink-soft);
  margin: 0 0 16px 22px;
}
.article-content li { margin-bottom: 8px; }

.breadcrumb {
  font-size: .875rem;
  color: var(--muted);
  margin-bottom: 24px;
}
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--brand-dark); }

/* Sitemap page */
.sitemap-list {
  max-width: 640px;
  margin: 0 auto;
  list-style: none;
}

.sitemap-list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.sitemap-list a { font-weight: 500; }

/* Mobile */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--ink);
  font-size: 1.5rem;
  cursor: pointer;
}

@media (max-width: 900px) {
  .features-grid,
  .advantage-grid,
  .reviews-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 16px 22px;
    border-bottom: 1px solid var(--line);
    gap: 12px;
  }
  .nav-links.open { display: flex; }
  .menu-toggle { display: block; }
  .header-inner { position: relative; }
  .header-inner > .btn { display: none; }
  .article-item { flex-direction: column; gap: 8px; }
  .hero { padding: 56px 0 48px; }
}