:root {
  --navy: #141f2c;
  --text: #2b3645;
  --muted: #5b6676;
  --blue: #3f78de;
  --blue-dark: #2f62c0;
  --chip: #4a72c0;
  --card: #ffffff;
  --line: #dbdee3;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(20, 31, 44, 0.08), 0 2px 6px rgba(20, 31, 44, 0.05);
  --font: "Inter", "SF Pro Display", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  line-height: 1.6;
  background: #f6f9fb;
  -webkit-font-smoothing: antialiased;
}

img, video { max-width: 100%; height: auto; display: block; }
h1, h2 { text-wrap: balance; }

a { color: var(--blue); }

.wrap { width: min(1120px, 100% - 40px); margin: 0 auto; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(246, 249, 251, 0.85);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid rgba(20, 31, 44, 0.06);
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--navy); text-decoration: none; font-weight: 700; font-size: 1.15rem; }
.brand img { width: 30px; height: 30px; }
.nav { display: flex; align-items: center; gap: 22px; font-size: 0.95rem; }
.nav a { color: var(--text); text-decoration: none; }
.nav a:hover { color: var(--blue); }
.nav .btn-primary, .nav .btn-primary:hover { color: #fff; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 1rem;
  white-space: nowrap;
  text-decoration: none;
  transition: transform 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--blue); color: #fff; box-shadow: 0 6px 16px rgba(63, 120, 222, 0.3); }
.btn-primary:hover { background: var(--blue-dark); }
.btn-ghost { background: #fff; color: var(--navy); border: 1px solid rgba(20, 31, 44, 0.12); }
.btn-small { padding: 8px 16px; font-size: 0.9rem; }

/* Hero */
.hero {
  background: linear-gradient(135deg, #81b3dd 0%, #a9cee1 35%, #bce3ea 65%, #e3eced 100%);
  padding: 72px 0 56px;
  text-align: center;
}
.hero h1 {
  margin: 0 auto;
  max-width: 940px;
  color: var(--navy);
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
}
.hero .lead { max-width: 640px; margin: 18px auto 0; font-size: clamp(1.05rem, 2.2vw, 1.25rem); color: #24344a; }
.cta { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 30px; }
.hero .note { margin-top: 14px; font-size: 0.92rem; color: #33465f; }
.demo {
  margin: 44px auto 0;
  max-width: 980px;
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
  box-shadow: 0 24px 60px rgba(20, 31, 44, 0.18);
}
.demo video { width: 100%; height: auto; aspect-ratio: 16 / 9; }

/* Sections */
section { padding: 72px 0; }
.section-title { text-align: center; color: var(--navy); font-size: clamp(1.6rem, 3.5vw, 2.2rem); margin: 0 0 10px; letter-spacing: -0.01em; }
.section-sub { text-align: center; color: var(--muted); max-width: 640px; margin: 0 auto 40px; }

.providers { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; max-width: 820px; margin: 0 auto; padding: 0; list-style: none; }
.providers li { background: var(--chip); color: #fff; padding: 8px 16px; border-radius: 999px; font-weight: 600; font-size: 0.95rem; }

.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card { background: var(--card); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow); }
.card h3 { margin: 0 0 8px; color: var(--navy); font-size: 1.12rem; }
.card p { margin: 0; color: var(--muted); }
.card .icon { font-size: 1.6rem; margin-bottom: 10px; }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.split h2 { color: var(--navy); font-size: clamp(1.5rem, 3vw, 2rem); margin: 0 0 14px; }
.split p { color: var(--muted); }
.split ul { padding-left: 1.2em; color: var(--text); }
.split li { margin: 6px 0; }
.shot { border-radius: var(--radius); box-shadow: var(--shadow); background: #fff; }

.steps { counter-reset: step; display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; padding: 0; list-style: none; }
.steps li { counter-increment: step; background: #fff; border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); }
.steps li::before { content: counter(step); display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; background: var(--blue); color: #fff; font-weight: 700; margin-bottom: 10px; }
.steps h3 { margin: 0 0 6px; color: var(--navy); font-size: 1.05rem; }
.steps p { margin: 0; color: var(--muted); }
kbd { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.85em; background: #eef2f7; border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 6px; padding: 1px 6px; }

.alt { background: #fff; }

.faq { max-width: 780px; margin: 0 auto; }
.faq details { background: #fff; border-radius: 12px; padding: 18px 22px; margin-bottom: 12px; box-shadow: var(--shadow); }
.faq summary { cursor: pointer; font-weight: 600; color: var(--navy); }
.faq details p { margin: 10px 0 0; color: var(--muted); }

.final { text-align: center; background: linear-gradient(135deg, #a9cee1 0%, #d4e9ee 100%); }
.final h2 { color: var(--navy); font-size: clamp(1.6rem, 3.5vw, 2.3rem); margin: 0 0 10px; }

.site-footer { padding: 28px 0; font-size: 0.9rem; color: var(--muted); }
.site-footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; }
.site-footer a { color: var(--muted); }

/* Article pages */
.article { padding: 48px 0 64px; }
.article .wrap { max-width: 760px; }
.crumbs { font-size: 0.9rem; color: var(--muted); margin: 0 0 18px; }
.crumbs a { color: var(--muted); }
.article h1 { color: var(--navy); font-size: clamp(1.9rem, 4.5vw, 2.7rem); line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 14px; }
.article .lead { font-size: 1.15rem; color: #33465f; margin: 0 0 8px; }
.article .meta { font-size: 0.88rem; color: var(--muted); margin: 0 0 28px; }
.article h2 { color: var(--navy); font-size: clamp(1.35rem, 3vw, 1.7rem); margin: 44px 0 12px; letter-spacing: -0.01em; }
.article h3 { color: var(--navy); font-size: 1.1rem; margin: 28px 0 8px; }
.article p, .article li { font-size: 1.04rem; }
.article ul, .article ol { padding-left: 1.3em; }
.article li { margin: 6px 0; }
.article img { margin: 24px 0; border-radius: var(--radius); box-shadow: var(--shadow); background: #fff; }
.article blockquote { margin: 18px 0; padding: 14px 18px; background: #fff; border-left: 4px solid var(--blue); border-radius: 8px; color: var(--text); }
.table-scroll { overflow-x: auto; margin: 18px 0; }
.article table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 10px; overflow: hidden; box-shadow: var(--shadow); font-size: 0.97rem; }
.article th, .article td { text-align: left; padding: 10px 14px; border-bottom: 1px solid #eef0f3; vertical-align: top; }
.article th { background: #eef4fb; color: var(--navy); }
.article tr:last-child td { border-bottom: 0; }
.cta-box { margin: 40px 0 8px; padding: 26px; border-radius: var(--radius); background: linear-gradient(135deg, #a9cee1 0%, #d4e9ee 100%); text-align: center; }
.cta-box p { margin: 0 0 16px; color: var(--navy); font-weight: 600; font-size: 1.1rem; }
.related { margin-top: 36px; padding-top: 20px; border-top: 1px solid var(--line); }
.related ul { list-style: none; padding: 0; }
.footer-links a { white-space: nowrap; }

@media (max-width: 860px) {
  .grid, .steps { grid-template-columns: 1fr; }
  .split { grid-template-columns: 1fr; gap: 24px; }
  .nav .hide-sm { display: none; }
  .nav { gap: 14px; }
  .site-header .btn-small { padding: 7px 12px; font-size: 0.85rem; }
  section { padding: 56px 0; }
  .hero { padding: 48px 0 40px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn { transition: none; }
}