:root {
  --bg: #161826; --bg-deep: #100f1c; --surface: #232532; --text: #E9E9ED;
  --accent: #E9A64A; --muted: rgba(233,233,237,.62); --divider: rgba(233,233,237,.14);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", sans-serif;
  line-height: 1.65; -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 1240px; margin: 0 auto; padding: 0 28px; }
a { color: var(--accent); text-decoration: none; }
img { max-width: 100%; display: block; }

/* ---------- 吸顶导航 ---------- */
header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(22,24,38,.72); backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--divider);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; padding: 13px 0; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 17px; color: var(--text); }
.brand img { width: 30px; height: 30px; border-radius: 7px; }
nav { display: flex; gap: 24px; align-items: center; font-size: 14px; }
nav a { color: var(--muted); }
nav a:hover { color: var(--text); }
.lang-btn { background: none; border: 1px solid var(--divider); color: var(--muted);
  border-radius: 6px; padding: 4px 10px; font-size: 12px; cursor: pointer; }
.lang-btn:hover { color: var(--text); }
.nav-dl { background: var(--accent); color: #161826 !important; font-weight: 600;
  border-radius: 8px; padding: 8px 18px; }
.nav-dl:hover { filter: brightness(1.08); }
@media (max-width: 720px) { nav a:not(.nav-dl):not(.lang-btn) { display: none; } }

/* ---------- Hero ---------- */
.hero { text-align: center; padding: 72px 0 100px; }
.hero h1 { font-size: 52px; line-height: 1.15; margin: 0 0 18px; font-weight: 700; letter-spacing: -1px; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero .lead { font-size: 18.5px; color: var(--muted); max-width: 620px; margin: 0 auto 30px; }
.cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.btn { display: inline-block; border-radius: 10px; padding: 14px 32px; font-size: 16px;
  font-weight: 600; cursor: pointer; border: 0; text-align: center; }
.btn-primary { background: var(--accent); color: #161826; }
.btn-primary:hover { filter: brightness(1.08); }
.btn-ghost { background: transparent; color: var(--text); border: 1px solid var(--divider); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.cta-note { font-size: 13px; color: var(--muted); margin-top: 16px; }
.quick { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap;
  padding: 44px 0 0; max-width: 860px; margin: 0 auto; }
.quick span { background: var(--surface); border: 1px solid var(--divider); border-radius: 999px;
  padding: 7px 18px; font-size: 13.5px; color: var(--muted); }
.hero-shot { max-width: 1120px; margin: 48px auto 0; }

/* ---------- 通用：海报图 / eyebrow ---------- */
.poster-img { border-radius: 16px; border: 1px solid var(--divider);
  box-shadow: 0 32px 84px rgba(0,0,0,.55);
  aspect-ratio: 2000 / 1251; width: 100%; object-fit: cover;
  background: var(--surface); }
.toolbar-sec .poster-img { aspect-ratio: 1480 / 270; }
.eyebrow { display: inline-block; background: rgba(233,166,74,.10); color: var(--accent);
  border: 1px solid rgba(233,166,74,.38); border-radius: 999px;
  padding: 5px 16px; font-size: 13px; font-weight: 600; letter-spacing: 1px; margin-bottom: 30px; }
section { padding: 100px 0; scroll-margin-top: 62px; }
section.alt { background: #1b1d2c; }
section.deep { background: var(--bg-deep); border-top: 1px solid var(--divider); border-bottom: 1px solid var(--divider); }
.poster { text-align: center; }
.poster img { max-width: 1120px; width: 100%; margin: 0 auto; }
.poster h2 { font-size: 30px; margin: 0 0 10px; letter-spacing: -0.5px; }
.poster .sub { color: var(--muted); font-size: 15px; max-width: 640px; margin: 0 auto 34px; }

/* ---------- 标注章节（真实工具栏） ---------- */
.toolbar-sec { text-align: center; }
.toolbar-sec h2 { font-size: 32px; margin: 0 0 12px; letter-spacing: -0.5px; }
.toolbar-sec .sub { color: var(--muted); font-size: 15.5px; max-width: 580px; margin: 0 auto 36px; }
.toolbar-sec img { max-width: 880px; width: 100%; margin: 0 auto 26px; border-radius: 14px; }
.tags { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; }
.tags span { background: var(--surface); border: 1px solid var(--divider); border-radius: 7px;
  padding: 5px 13px; font-size: 12.5px; color: var(--text); }

/* ---------- AI 深色章节 ---------- */
.ai-band { text-align: center; }
.ai-band h2 { font-size: 30px; margin: 0 0 10px; letter-spacing: -0.5px; }
.ai-band .sub { color: var(--muted); font-size: 15px; max-width: 640px; margin: 0 auto 36px; }
.ai-band img { max-width: 1120px; width: 100%; margin: 0 auto 44px; }
.ai-trio { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; max-width: 980px; margin: 0 auto; text-align: left; }
.ai-trio div { background: var(--surface); border-radius: 14px; padding: 24px 26px; }
.ai-trio h3 { font-size: 16.5px; margin: 0 0 6px; color: var(--accent); }
.ai-trio p { font-size: 13.5px; color: var(--muted); margin: 0; }
@media (max-width: 760px) { .ai-trio { grid-template-columns: 1fr; } }

/* ---------- 小工具三块 ---------- */
.tools-sec { text-align: center; }
.tools-sec h2 { font-size: 30px; margin: 0 0 12px; letter-spacing: -0.5px; }
.tools-sec .sub { color: var(--muted); font-size: 15px; margin: 0 0 36px; }
.trio { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; max-width: 980px; margin: 0 auto; text-align: left; }
.trio div { background: var(--surface); border-radius: 14px; padding: 24px 26px; }
.trio .ic { font-size: 22px; margin-bottom: 8px; }
.trio h3 { font-size: 16.5px; margin: 0 0 6px; }
.trio p { font-size: 13.5px; color: var(--muted); margin: 0; }
@media (max-width: 760px) { .trio { grid-template-columns: 1fr; } }

/* ---------- 完整功能表 ---------- */
.all-feats { text-align: center; }
.all-feats h2 { font-size: 30px; margin: 0 0 40px; }
.cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; max-width: 900px; margin: 0 auto; text-align: left; }
.cols > div { background: var(--surface); border-radius: 14px; padding: 24px 28px; }
.cols h3 { font-size: 14px; margin: 0 0 12px; color: var(--accent); letter-spacing: 1px; text-transform: uppercase; }
.cols ul { margin: 0; padding: 0; list-style: none; font-size: 14px; color: var(--muted); }
.cols li { padding: 4px 0; }
@media (max-width: 720px) { .cols { grid-template-columns: 1fr; } }

/* ---------- Free / Pro ---------- */
.plans { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; max-width: 820px; margin: 0 auto; }
.plan { background: var(--surface); border-radius: 18px; padding: 34px 36px; border: 1px solid var(--divider); }
.plan.pro { border-color: var(--accent); box-shadow: 0 0 50px rgba(233,166,74,.15); }
.plan h3 { font-size: 20px; margin: 0 0 2px; }
.plan .p-price { font-size: 15px; color: var(--muted); margin-bottom: 20px; }
.plan.pro .p-price { color: var(--accent); font-weight: 600; }
.plan ul { margin: 0 0 24px; padding: 0; list-style: none; font-size: 14px; }
.plan li { padding: 5px 0 5px 24px; position: relative; color: var(--text); }
.plan li::before { content: "✓"; position: absolute; left: 0; color: var(--accent); }
.plan .btn { width: 100%; }
@media (max-width: 720px) { .plans { grid-template-columns: 1fr; } }

/* ---------- 购买区 / FAQ / footer ---------- */
.buy { text-align: center; }
.buy h2 { font-size: 44px; margin: 0 0 12px; letter-spacing: -1px; }
.buy .sub { color: var(--muted); font-size: 16px; margin-bottom: 30px; line-height: 1.9; }
.trust { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-top: 22px; }
.trust span { background: var(--surface); border: 1px solid var(--divider); border-radius: 999px;
  padding: 6px 16px; font-size: 12.5px; color: var(--muted); }
.faq-sec h2 { font-size: 30px; text-align: center; margin: 0 0 36px; }
.faq { max-width: 720px; margin: 0 auto; }
.faq details { background: var(--surface); border-radius: 12px; padding: 16px 22px; margin-bottom: 10px; }
.faq summary { cursor: pointer; font-weight: 600; font-size: 15px; }
.faq p { color: var(--muted); font-size: 14px; margin: 10px 0 0; }
footer { margin-top: 0; padding: 30px 0 46px; border-top: 1px solid var(--divider);
  text-align: center; color: var(--muted); font-size: 13px; }
footer a { color: var(--muted); margin: 0 10px; }
footer a:hover { color: var(--text); }

/* ---------- 微信收款弹层（中文购买路径） ---------- */
.modal-mask { position: fixed; inset: 0; background: rgba(0,0,0,.6); z-index: 100;
  display: none; align-items: center; justify-content: center; backdrop-filter: blur(4px); }
.modal-mask.show { display: flex; }
.wx-modal { background: var(--surface); border: 1px solid var(--divider); border-radius: 18px;
  padding: 34px 38px; max-width: 400px; width: calc(100% - 48px); text-align: center; position: relative; }
.wx-modal .close { position: absolute; top: 14px; right: 18px; background: none; border: 0;
  color: var(--muted); font-size: 20px; cursor: pointer; }
.wx-modal h3 { font-size: 20px; margin: 0 0 4px; }
.wx-modal .price { color: var(--accent); font-size: 30px; font-weight: 700; margin-bottom: 18px; }
.wx-qr { width: 220px; height: 220px; margin: 0 auto 20px; border-radius: 12px;
  background: #fff; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.wx-qr img { width: 100%; height: 100%; object-fit: contain; }
.wx-qr .ph { color: #888; font-size: 13px; padding: 20px; }
.wx-steps { text-align: left; font-size: 13.5px; color: var(--muted); margin: 0 0 18px; padding-left: 20px; }
.wx-steps li { margin-bottom: 6px; }
.wx-steps b { color: var(--text); font-weight: 600; }
.wx-alt { font-size: 12.5px; color: var(--muted); }
.wx-alt a { cursor: pointer; }