:root {
  --sea-900: #0b1b2e;
  --sea-800: #12294a;
  --sea-700: #1b3a66;
  --sea-100: #e8eef7;
  --flame: #f28c28;
  --flame-dark: #d9731a;
  --ink: #1d2433;
  --muted: #5b6577;
  --line: #e3e7ee;
  --bg: #f6f8fb;
  --card: #ffffff;
  --ok: #2e9e5b;
  --radius: 14px;
  --shadow: 0 6px 24px rgba(11, 27, 46, 0.08);
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans CJK SC", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--bg); line-height: 1.7; font-size: 16px; }
a { color: var(--sea-700); text-decoration: none; }
a:hover { color: var(--flame-dark); }
img { max-width: 100%; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 20px; }

/* 顶部导航 */
.nav { position: sticky; top: 0; z-index: 10; background: rgba(11, 27, 46, 0.96); backdrop-filter: blur(6px); }
.nav .wrap { display: flex; align-items: center; height: 64px; gap: 28px; }
.brand { display: flex; align-items: center; gap: 10px; color: #fff; font-weight: 700; font-size: 19px; letter-spacing: 1px; }
.brand:hover { color: #fff; }
.brand-mark { width: 30px; height: 30px; }
.nav-links { display: flex; gap: 24px; margin-left: auto; }
.nav-links a { color: #c9d4e5; font-size: 15px; }
.nav-links a:hover, .nav-links a.active { color: #fff; }
.nav-cta { background: var(--flame); color: #fff !important; padding: 7px 16px; border-radius: 999px; font-weight: 600; }
.nav-cta:hover { background: var(--flame-dark); }

/* 首屏 */
.hero { background: radial-gradient(1200px 500px at 80% -10%, rgba(242, 140, 40, 0.28), transparent 60%),
                    linear-gradient(160deg, var(--sea-900), var(--sea-700)); color: #fff; padding: 88px 0 96px; }
.hero h1 { font-size: 44px; line-height: 1.25; margin: 0 0 18px; letter-spacing: 1px; }
.hero h1 em { font-style: normal; color: var(--flame); }
.hero p { font-size: 18px; color: #c9d4e5; max-width: 640px; margin: 0 0 32px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.btn { display: inline-block; padding: 12px 26px; border-radius: 999px; font-weight: 600; font-size: 16px; border: 2px solid transparent; cursor: pointer; transition: transform .15s, background .15s; }
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--flame); color: #fff; }
.btn-primary:hover { background: var(--flame-dark); color: #fff; }
.btn-ghost { border-color: rgba(255, 255, 255, 0.5); color: #fff; }
.btn-ghost:hover { border-color: #fff; color: #fff; }
.btn-outline { border-color: var(--sea-700); color: var(--sea-700); background: #fff; }
.btn-outline:hover { background: var(--sea-100); color: var(--sea-800); }
.btn[disabled], .btn.disabled { opacity: .55; cursor: not-allowed; transform: none; }

/* 通用区块 */
section { padding: 72px 0; }
.section-title { text-align: center; margin-bottom: 44px; }
.section-title h2 { font-size: 30px; margin: 0 0 10px; }
.section-title p { color: var(--muted); margin: 0; }
.page-head { background: linear-gradient(160deg, var(--sea-900), var(--sea-700)); color: #fff; padding: 56px 0 48px; }
.page-head h1 { margin: 0 0 8px; font-size: 34px; }
.page-head p { margin: 0; color: #c9d4e5; }

.grid { display: grid; gap: 22px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow); }
.card h3 { margin: 0 0 6px; font-size: 20px; }
.card .tag { display: inline-block; font-size: 12px; font-weight: 600; color: var(--flame-dark); background: #fff3e6; border-radius: 6px; padding: 2px 8px; margin-bottom: 12px; }
.card p { color: var(--muted); margin: 0 0 14px; }
.card ul { margin: 0; padding-left: 20px; color: var(--ink); }
.card li { margin: 4px 0; }
.icon { width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; background: var(--sea-100); color: var(--sea-700); margin-bottom: 16px; }
.icon svg { width: 24px; height: 24px; }

/* 流程 */
.steps { counter-reset: step; display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.step { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 24px 20px; position: relative; }
.step::before { counter-increment: step; content: counter(step); position: absolute; top: -16px; left: 20px; width: 32px; height: 32px; border-radius: 50%;
                background: var(--flame); color: #fff; font-weight: 700; display: grid; place-items: center; }
.step h4 { margin: 8px 0 6px; font-size: 17px; }
.step p { margin: 0; color: var(--muted); font-size: 14px; }

/* 价格 */
.plans { display: grid; grid-template-columns: repeat(2, minmax(0, 380px)); justify-content: center; gap: 26px; }
.plan { background: #fff; border: 2px solid var(--line); border-radius: 18px; padding: 32px; position: relative; box-shadow: var(--shadow); display: flex; flex-direction: column; }
.plan.highlight { border-color: var(--flame); }
.plan .badge { position: absolute; top: -13px; right: 24px; background: var(--flame); color: #fff; font-size: 13px; font-weight: 600; padding: 3px 12px; border-radius: 999px; }
.plan h3 { margin: 0 0 8px; font-size: 22px; }
.price { font-size: 44px; font-weight: 800; color: var(--sea-800); margin: 6px 0 2px; }
.price small { font-size: 16px; font-weight: 500; color: var(--muted); }
.plan ul { list-style: none; padding: 0; margin: 18px 0 26px; flex: 1; }
.plan li { padding: 6px 0 6px 26px; position: relative; }
.plan li::before { content: ""; position: absolute; left: 4px; top: 13px; width: 10px; height: 6px; border-left: 2px solid var(--ok); border-bottom: 2px solid var(--ok); transform: rotate(-45deg); }
.plan .btn { text-align: center; }

/* 下载 */
.dl { display: flex; align-items: center; gap: 22px; }
.dl .meta { color: var(--muted); font-size: 14px; }
.dl .grow { flex: 1; }
.req { color: var(--muted); font-size: 14px; }

/* 教程 */
.docs { display: grid; grid-template-columns: 240px 1fr; gap: 36px; align-items: start; }
.toc { position: sticky; top: 88px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 16px; }
.toc a { display: block; padding: 6px 10px; border-radius: 8px; color: var(--ink); font-size: 15px; }
.toc a:hover { background: var(--sea-100); }
.toc .sub { padding-left: 22px; font-size: 14px; color: var(--muted); }
.doc h2 { font-size: 26px; margin: 0 0 14px; padding-top: 12px; }
.doc h3 { font-size: 19px; margin: 28px 0 10px; }
.doc section { padding: 0 0 36px; border-bottom: 1px solid var(--line); margin-bottom: 36px; }
.doc ol, .doc ul { padding-left: 22px; }
.doc li { margin: 6px 0; }
.doc code, .kbd { background: #eef1f6; border-radius: 6px; padding: 1px 6px; font-family: Consolas, "SFMono-Regular", monospace; font-size: 14px; }
.note { background: #fff8ee; border-left: 4px solid var(--flame); padding: 12px 16px; border-radius: 8px; margin: 14px 0; color: #5c4424; }
.tip { background: #eef7f1; border-left: 4px solid var(--ok); padding: 12px 16px; border-radius: 8px; margin: 14px 0; color: #22543a; }
table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 10px; overflow: hidden; }
th, td { padding: 10px 14px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; font-size: 15px; }
th { background: #f1f4f9; font-weight: 600; }

/* 联系 */
.contact-box { background: linear-gradient(135deg, var(--sea-800), var(--sea-700)); color: #fff; border-radius: 18px; padding: 36px; display: flex; align-items: center; gap: 24px; flex-wrap: wrap; }
.contact-box h3 { margin: 0 0 4px; font-size: 22px; }
.contact-box p { margin: 0; color: #c9d4e5; }
.contact-id { font-size: 26px; font-weight: 800; letter-spacing: 1px; color: var(--flame); }
.copy-btn { margin-left: auto; }

/* 页脚 */
footer { background: var(--sea-900); color: #8fa0b8; padding: 36px 0; font-size: 14px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 18px; justify-content: space-between; }
footer a { color: #c9d4e5; }

.toast { position: fixed; left: 50%; bottom: 32px; transform: translateX(-50%); background: var(--sea-900); color: #fff; padding: 10px 20px; border-radius: 999px; font-size: 14px; opacity: 0; transition: opacity .2s; pointer-events: none; }
.toast.show { opacity: 1; }

@media (max-width: 900px) {
  .grid-3, .steps { grid-template-columns: 1fr 1fr; }
  .docs { grid-template-columns: 1fr; }
  .toc { position: static; }
}
@media (max-width: 640px) {
  .hero { padding: 60px 0 68px; }
  .hero h1 { font-size: 32px; }
  .grid-3, .grid-2, .steps, .plans { grid-template-columns: 1fr; }
  .nav-links { gap: 14px; }
  .nav-links a:not(.nav-cta) { display: none; }
  .dl { flex-direction: column; align-items: flex-start; }
  .copy-btn { margin-left: 0; }
}