:root {
  --accent: #e67e22;
  --accent-dark: #cf711f;
  --bg: #f4f6f8;
  --bg-alt: #ffffff;
  --text: #1f2933;
  --text-muted: #5f6c7b;
  --header: #1c375a;
  --radius: 12px;
  --shadow: 0 12px 40px rgba(28, 55, 90, 0.12);
  --font: "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(--text);
  background: var(--bg);
  line-height: 1.6;
}

a { color: var(--accent-dark); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }

.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(28, 55, 90, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.header-inner {
  display: flex; align-items: center; gap: 24px;
  min-height: 64px;
}

.brand {
  display: flex; align-items: center; gap: 10px;
  color: #fff; font-weight: 700; font-size: 1.15rem;
  text-decoration: none;
}
.brand:hover { text-decoration: none; opacity: 0.9; }
.brand img { border-radius: 8px; }

.site-header nav {
  display: flex; gap: 20px; margin-left: auto;
}
.site-header nav a { color: #d8e4f2; font-size: 0.95rem; text-decoration: none; }
.site-header nav a:hover { color: #fff; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 10px; font-weight: 600; text-decoration: none;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
  border: none; cursor: pointer;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }

.btn-primary {
  background: var(--accent); color: #fff;
  box-shadow: 0 4px 14px rgba(230, 126, 34, 0.35);
}
.btn-primary:hover { background: var(--accent-dark); color: #fff; }

.btn-ghost {
  background: transparent; color: var(--text);
  border: 1px solid #d9e2ec;
}
.btn-ghost:hover { background: #fff; color: var(--text); }

.btn-sm { padding: 8px 16px; font-size: 0.9rem; }
.btn-lg { padding: 14px 28px; font-size: 1.05rem; }

.hero {
  background: linear-gradient(160deg, var(--header) 0%, #2e5a8a 55%, #3d7ab5 100%);
  color: #fff; padding: 72px 0 80px;
}

.hero-grid {
  display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 48px; align-items: center;
}

.badge-free {
  display: inline-block;
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.25);
  padding: 6px 14px; border-radius: 999px;
  font-size: 0.85rem; font-weight: 600; margin: 0 0 16px;
}

.hero h1 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  line-height: 1.2; margin: 0 0 20px;
}
.hero .accent { color: #ffd4a8; }

.lead { font-size: 1.1rem; color: #d8e4f2; max-width: 540px; margin: 0 0 28px; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 24px; }
.hero-actions .btn-ghost { color: #fff; border-color: rgba(255,255,255,0.35); }
.hero-actions .btn-ghost:hover { background: rgba(255,255,255,0.1); color: #fff; }

.hero-meta {
  list-style: none; padding: 0; margin: 0;
  display: flex; flex-wrap: wrap; gap: 16px;
  font-size: 0.9rem; color: #b8cfe4;
}
.hero-meta li::before { content: "✓ "; color: #7dcea0; }

.hero-shot {
  width: 100%; height: auto; display: block;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid rgba(255,255,255,0.12);
}

.screenshots {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px;
}
.screenshot-card {
  margin: 0;
  background: var(--bg);
  border: 1px solid #e8edf2;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(28, 55, 90, 0.06);
}
.screenshot-card img {
  width: 100%; height: auto; display: block;
}
.screenshot-card figcaption {
  padding: 14px 18px;
  font-size: 0.92rem;
  color: var(--text-muted);
  text-align: center;
  border-top: 1px solid #e8edf2;
}

.trust {
  background: var(--bg-alt);
  border-bottom: 1px solid #e8edf2;
  padding: 40px 0;
}
.trust-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.trust h2 { font-size: 1.1rem; margin: 0 0 8px; color: var(--header); }
.trust p { margin: 0; color: var(--text-muted); font-size: 0.95rem; }

.section { padding: 72px 0; }
.section-alt { background: var(--bg-alt); }
.section h2 { font-size: 1.75rem; margin: 0 0 12px; color: var(--header); }
.section-desc { color: var(--text-muted); max-width: 720px; margin: 0 0 36px; }

.cards {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px;
}
.card {
  background: var(--bg-alt); border: 1px solid #e8edf2;
  border-radius: var(--radius); padding: 24px;
}
.section-alt .card { background: var(--bg); }
.card h3 { margin: 0 0 10px; font-size: 1.1rem; color: var(--header); }
.card p { margin: 0; color: var(--text-muted); font-size: 0.95rem; }
.card code { background: #eef2f6; padding: 2px 6px; border-radius: 4px; font-size: 0.85em; }

.tag-grid {
  display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 20px;
}
.tag-grid span {
  background: #fff4e8; color: var(--accent-dark);
  padding: 8px 14px; border-radius: 999px;
  font-size: 0.9rem; font-weight: 600;
}
.note { color: var(--text-muted); font-size: 0.9rem; }

.faq-list { display: flex; flex-direction: column; gap: 12px; }
.faq-list details {
  background: var(--bg-alt); border: 1px solid #e8edf2;
  border-radius: var(--radius); padding: 16px 20px;
}
.faq-list summary {
  cursor: pointer; font-weight: 600; color: var(--header);
}
.faq-list p { margin: 12px 0 0; color: var(--text-muted); }

.cta-bottom {
  background: var(--header); color: #fff;
  padding: 64px 0; text-align: center;
}
.cta-inner h2 { margin: 0 0 8px; font-size: 1.75rem; }
.cta-inner p { color: #d8e4f2; margin: 0 0 24px; }

.site-footer {
  background: #152a44; color: #94a8bc;
  padding: 32px 0; font-size: 0.9rem;
}
.footer-inner { text-align: center; }
.footer-inner p { margin: 6px 0; }
.footer-inner a { color: #c8d8e8; }

@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { order: -1; max-width: 520px; margin: 0 auto; }
  .trust-grid, .cards, .screenshots { grid-template-columns: 1fr; }
  .site-header nav { display: none; }
}