:root {
  --bg: #0b0d12;
  --bg-soft: #10131b;
  --card: #151a25;
  --card-2: #1a2030;
  --line: rgba(255, 255, 255, 0.09);
  --text: #eef1f8;
  --muted: #9aa4b5;
  --indigo: #6366f1;
  --pink: #ec4899;
  --green: #34d399;
  --amber: #fbbf24;
  --radius: 18px;
  --max: 1120px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    radial-gradient(900px 420px at 12% -8%, rgba(99, 102, 241, 0.22), transparent 62%),
    radial-gradient(760px 380px at 92% 4%, rgba(236, 72, 153, 0.16), transparent 60%),
    var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: #a5b4fc; text-decoration: none; }
a:hover { color: #c7d2fe; }

img { max-width: 100%; display: block; }

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

/* ---------- nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(11, 13, 18, 0.78);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 14px;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 800; letter-spacing: 0.2px; }
.brand img { width: 32px; height: 32px; border-radius: 9px; }
.brand small { display: block; font-size: 11px; color: var(--muted); font-weight: 500; letter-spacing: 0; }
.nav-links { display: flex; gap: 20px; margin-left: auto; align-items: center; }
.nav-links a { color: var(--muted); font-size: 14px; }
.nav-links a:hover { color: var(--text); }
.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 14px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(120deg, var(--indigo), var(--pink));
  box-shadow: 0 8px 22px rgba(99, 102, 241, 0.28);
}

/* ---------- hero ---------- */
.hero { padding: 72px 0 48px; }
.hero-grid { display: grid; grid-template-columns: 1.08fr 0.92fr; gap: 44px; align-items: center; }
.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 13px;
  border: 1px solid rgba(52, 211, 153, 0.3);
  background: rgba(52, 211, 153, 0.08);
  color: #a7f3d0;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
}
.pill .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 10px var(--green); }
h1 {
  margin: 18px 0 14px;
  font-size: clamp(34px, 4.2vw, 58px);
  line-height: 1.12;
  letter-spacing: -0.5px;
}
.grad { background: linear-gradient(100deg, #a5b4fc 8%, #f9a8d4 60%, #fbbf24 100%); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { color: var(--muted); font-size: 17px; margin: 0 0 26px; max-width: 560px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 20px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 700;
  border: 1px solid var(--line);
  color: var(--text);
  background: var(--card);
  transition: transform 0.12s ease, border-color 0.12s ease;
}
.btn:hover { transform: translateY(-1px); border-color: rgba(255, 255, 255, 0.22); color: var(--text); }
.btn-primary {
  color: #fff;
  border: 0;
  background: linear-gradient(120deg, var(--indigo), var(--pink));
  box-shadow: 0 12px 30px rgba(99, 102, 241, 0.32);
}
.btn-ghost { color: var(--muted); background: transparent; }
.hero-note { margin-top: 18px; color: var(--muted); font-size: 13px; }
.hero-note a { color: #c7d2fe; }

.hero-art { position: relative; }
.shot-frame {
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: linear-gradient(150deg, rgba(99, 102, 241, 0.18), rgba(236, 72, 153, 0.12));
  padding: 9px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.55);
  overflow: hidden;
}
.shot-frame img { border-radius: 11px; }
.hero-art::after {
  content: "只读整理 · 本地导出";
  position: absolute;
  right: 18px;
  bottom: -16px;
  padding: 8px 14px;
  border-radius: 999px;
  background: #151a25;
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

/* ---------- trust ---------- */
.trust { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; padding: 26px 0 8px; }
.trust div { background: rgba(255, 255, 255, 0.03); border: 1px solid var(--line); border-radius: 13px; padding: 13px 15px; color: var(--muted); font-size: 13px; }
.trust b { display: block; color: var(--text); font-size: 14px; margin-bottom: 2px; }

/* ---------- sections ---------- */
section { padding: 58px 0; }
.sec-head { max-width: 720px; margin-bottom: 30px; }
.eyebrow { color: #a5b4fc; font-size: 13px; font-weight: 800; letter-spacing: 1.6px; text-transform: uppercase; }
h2 { margin: 8px 0 10px; font-size: clamp(25px, 3vw, 36px); line-height: 1.22; letter-spacing: -0.2px; }
.sec-head p { color: var(--muted); margin: 0; }

/* ---------- screenshots ---------- */
.shots { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.shot { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px; }
.shot img { border-radius: 11px; aspect-ratio: 16 / 10; object-fit: cover; }
.shot p { margin: 11px 6px 4px; font-size: 13px; color: var(--muted); }
.shot b { color: var(--text); display: block; margin-bottom: 2px; font-size: 14px; }

/* ---------- features ---------- */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.feature { background: linear-gradient(180deg, var(--card-2), var(--card)); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.feature .ico {
  width: 42px; height: 42px; border-radius: 12px; display: grid; place-items: center;
  background: linear-gradient(120deg, rgba(99, 102, 241, 0.24), rgba(236, 72, 153, 0.18));
  border: 1px solid rgba(165, 180, 252, 0.24); font-size: 20px; margin-bottom: 15px;
}
.feature h3 { margin: 0 0 8px; font-size: 17px; }
.feature p { margin: 0; color: var(--muted); font-size: 14px; }

/* ---------- steps ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; counter-reset: step; }
.step { position: relative; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 22px 22px; }
.step::before {
  counter-increment: step; content: "0" counter(step);
  position: absolute; top: 18px; right: 20px; color: rgba(165, 180, 252, 0.4); font-weight: 800; font-size: 20px;
}
.step h3 { margin: 0 0 8px; font-size: 17px; }
.step p { margin: 0; color: var(--muted); font-size: 14px; }

/* ---------- safety ---------- */
.safety { background: linear-gradient(135deg, rgba(99, 102, 241, 0.12), rgba(236, 72, 153, 0.08)); border: 1px solid rgba(165, 180, 252, 0.16); border-radius: 24px; padding: 38px; }
.safety-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 34px; align-items: center; }
.safety h2 { margin-top: 0; }
.safety p { color: var(--muted); margin: 0 0 14px; }
.checks { display: grid; gap: 10px; margin: 0; padding: 0; list-style: none; }
.checks li { background: rgba(9, 12, 18, 0.55); border: 1px solid var(--line); border-radius: 11px; padding: 11px 14px; color: var(--muted); font-size: 14px; }
.checks b { color: var(--text); }

/* ---------- download ---------- */
.download-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.dl {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px;
  display: flex; flex-direction: column; gap: 12px;
}
.dl .tag { align-self: flex-start; font-size: 12px; font-weight: 700; color: #a7f3d0; background: rgba(52, 211, 153, 0.1); border: 1px solid rgba(52, 211, 153, 0.28); padding: 4px 10px; border-radius: 999px; }
.dl h3 { margin: 0; font-size: 20px; }
.dl p { margin: 0; color: var(--muted); font-size: 14px; }
.dl .btn { margin-top: auto; }
.manual { margin-top: 22px; background: var(--bg-soft); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.manual h3 { margin: 0 0 10px; font-size: 17px; }
.manual ol { margin: 0; padding-left: 22px; color: var(--muted); }
.manual li { margin: 7px 0; }
.manual code { color: #c7d2fe; background: rgba(99, 102, 241, 0.14); padding: 1px 6px; border-radius: 5px; font-size: 13px; }

/* ---------- faq ---------- */
.faq { display: grid; gap: 12px; }
details { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 16px 20px; }
details[open] { border-color: rgba(165, 180, 252, 0.28); }
summary { cursor: pointer; font-weight: 700; font-size: 15px; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; color: var(--muted); font-weight: 400; font-size: 20px; line-height: 1; }
details[open] summary::after { content: "–"; }
details p { margin: 12px 0 0; color: var(--muted); font-size: 14px; }

/* ---------- footer ---------- */
footer { border-top: 1px solid var(--line); padding: 34px 0 46px; color: var(--muted); font-size: 13px; }
.foot { display: flex; flex-wrap: wrap; gap: 20px; justify-content: space-between; align-items: flex-start; }
.foot a { color: var(--muted); }
.foot a:hover { color: var(--text); }
.foot-links { display: flex; flex-wrap: wrap; gap: 16px; }
.disclaimer { margin-top: 18px; max-width: 860px; color: #7c8698; font-size: 12px; line-height: 1.8; }

/* ---------- responsive ---------- */
@media (max-width: 960px) {
  .hero-grid, .safety-grid { grid-template-columns: 1fr; }
  .hero-art { max-width: 720px; }
  .trust { grid-template-columns: repeat(2, 1fr); }
  .shots, .features, .steps { grid-template-columns: 1fr 1fr; }
  .download-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .wrap, .nav-inner { width: min(var(--max), calc(100% - 28px)); }
  .nav-links a:not(.nav-cta) { display: none; }
  .hero { padding: 44px 0 30px; }
  .shots, .features, .steps, .trust { grid-template-columns: 1fr; }
  .safety { padding: 24px; }
  section { padding: 42px 0; }
}