/* ============================================================
   一耽漫画Pro app 下载官网  style.css
   主题：深藏青 + 亮蓝（Pro 高级感，参考 acedonman.net.cn）
   ============================================================ */
:root {
  --bg: #0b1220;
  --bg-soft: #0f1830;
  --surface: #141f38;
  --card: #182443;
  --border: #24345c;
  --text: #eef2ff;
  --muted: #93a3c4;
  --primary: #38bdf8;
  --primary-2: #3b82f6;
  --grad: linear-gradient(120deg, #38bdf8, #3b82f6);
  --radius: 16px;
  --shadow: 0 20px 50px rgba(0, 0, 0, .45);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { font-family: inherit; }

.container { width: min(1140px, 92%); margin: 0 auto; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 26px; border-radius: 999px; font-size: 15px; font-weight: 600;
  cursor: pointer; border: 1px solid transparent; transition: transform .2s, box-shadow .2s;
  white-space: nowrap;
}
.btn-primary { background: var(--grad); color: #06121f; box-shadow: 0 10px 28px rgba(56,189,248,.35); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 36px rgba(59,130,246,.45); }
.btn-white { background: #fff; color: var(--primary-2); box-shadow: 0 12px 30px rgba(0,0,0,.3); }
.btn-white:hover { transform: translateY(-2px); }
.btn-lg { padding: 15px 34px; font-size: 16px; }
.btn-xl { padding: 18px 48px; font-size: 18px; }
.ico { width: 20px; height: 20px; }

/* ---------- 导航 ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(11, 18, 32, .8);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  width: min(1140px, 92%); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between; height: 68px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-logo { width: 36px; height: 36px; border-radius: 10px; object-fit: cover; }
.brand-name { font-size: 19px; font-weight: 800; }
.brand-name em { font-style: normal; color: var(--primary); }
.nav-tagline { color: var(--muted); font-size: 14px; }
.nav-download { padding: 9px 22px; }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; flex-direction: column; gap: 5px; width: 44px; height: 44px; align-items: center; justify-content: center; }
.nav-toggle span { width: 24px; height: 2px; background: var(--text); border-radius: 2px; }

/* ---------- Hero ---------- */
.hero { position: relative; padding: 150px 0 90px; overflow: hidden; }
.hero-glow {
  position: absolute; top: -150px; right: -100px;
  width: 560px; height: 560px; border-radius: 50%;
  background: radial-gradient(circle, rgba(56,189,248,.25), transparent 65%);
  filter: blur(40px); pointer-events: none;
}
.hero-inner { position: relative; z-index: 1; display: grid; grid-template-columns: 1.1fr .9fr; gap: 50px; align-items: center; }
.hero h1 { font-size: 52px; line-height: 1.18; font-weight: 900; letter-spacing: -1px; }
.hero-sub { color: var(--muted); font-size: 17px; margin: 22px 0 30px; max-width: 480px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-meta { margin-top: 20px; font-size: 13px; color: var(--muted); }

.phone-frame {
  width: 280px; margin: 0 auto; border-radius: 38px; padding: 12px;
  background: #06101f; border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.phone-frame img { border-radius: 28px; width: 100%; height: auto; }
.phone-frame.sm { width: 200px; border-radius: 30px; padding: 9px; }
.phone-frame.sm img { border-radius: 22px; }
.hero-visual { animation: float 5s ease-in-out infinite; }
@keyframes float { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-14px)} }

/* ---------- 核心功能 ---------- */
.features { padding: 60px 0; }
.section-tag { color: var(--primary); font-size: 13px; font-weight: 700; letter-spacing: 3px; text-transform: uppercase; margin-bottom: 12px; }
.section-title { font-size: 34px; font-weight: 800; }
.section-desc { color: var(--muted); margin-top: 10px; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 44px; }
.feature-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px 28px;
  transition: transform .25s, border-color .25s;
}
.feature-card:hover { transform: translateY(-6px); border-color: var(--primary); }
.f-no { font-size: 30px; font-weight: 900; color: var(--primary); opacity: .9; }
.feature-card h3 { font-size: 20px; margin: 14px 0 10px; }
.feature-card p { color: var(--muted); font-size: 14.5px; }

/* ---------- 界面一览 ---------- */
.showcase { padding: 40px 0 70px; }
.showcase-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.shot { text-align: center; }
.shot figcaption { margin-top: 14px; color: var(--muted); font-size: 14px; }

/* ---------- FAQ ---------- */
.faq { padding: 60px 0; }
.faq-inner { max-width: 820px; }
.faq-list { margin-top: 36px; }
.faq-item {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 14px; margin-bottom: 14px; overflow: hidden;
}
.faq-q {
  width: 100%; background: none; border: 0; color: var(--text);
  padding: 20px 24px; font-size: 16px; font-weight: 600; text-align: left;
  display: flex; justify-content: space-between; align-items: center; cursor: pointer;
}
.faq-arrow { color: var(--primary); font-size: 22px; transition: transform .3s; }
.faq-item.open .faq-arrow { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .35s ease; }
.faq-a p { padding: 0 24px 20px; color: var(--muted); font-size: 15px; }

/* ---------- CTA ---------- */
.cta {
  position: relative; overflow: hidden; text-align: center;
  background:
    radial-gradient(circle at 25% 30%, rgba(56,189,248,.25), transparent 55%),
    radial-gradient(circle at 75% 70%, rgba(59,130,246,.25), transparent 55%),
    var(--bg-soft);
  border-top: 1px solid var(--border);
  padding: 90px 0;
}
.cta-inner h2 { font-size: 36px; font-weight: 900; margin-bottom: 12px; }
.cta-inner p { color: var(--muted); font-size: 16px; margin-bottom: 28px; }
.cta-meta { margin-top: 18px; font-size: 13px; color: var(--muted); }

/* ---------- 页脚 ---------- */
.footer { border-top: 1px solid var(--border); padding: 40px 0; background: #080e1a; }
.footer-inner { text-align: center; }
.footer-brand { display: flex; align-items: center; justify-content: center; gap: 10px; margin-bottom: 14px; font-weight: 600; }
.footer-logo { width: 32px; height: 32px; border-radius: 8px; }
.footer-copy { color: var(--muted); font-size: 13px; }

/* ---------- 回到顶部 ---------- */
.back-top {
  position: fixed; right: 26px; bottom: 26px; z-index: 90;
  width: 46px; height: 46px; border-radius: 50%;
  background: var(--grad); color: #06121f; display: grid; place-items: center;
  opacity: 0; pointer-events: none; transition: opacity .3s;
  box-shadow: 0 8px 22px rgba(56,189,248,.4);
}
.back-top.show { opacity: 1; pointer-events: auto; }
.back-top svg { width: 22px; height: 22px; }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .hero { padding: 110px 0 50px; }
  .hero-inner { grid-template-columns: 1fr; text-align: center; }
  .hero-sub { margin-left: auto; margin-right: auto; }
  .hero-cta { justify-content: center; }
  .hero-visual { margin-top: 30px; }
  .hero h1 { font-size: 38px; }
  .nav-tagline { display: none; }
  .feature-grid { grid-template-columns: 1fr; }
  .showcase-row { grid-template-columns: 1fr; gap: 30px; }
  .nav-toggle { display: flex; }
  .nav-download { display: none; }
  .section-title { font-size: 28px; }
  .cta-inner h2 { font-size: 28px; }
}
@media (max-width: 560px) {
  .hero h1 { font-size: 30px; }
  .btn-xl { padding: 15px 32px; font-size: 16px; }
}