/* ============================================================
   openExplore · 精准复习 —— 官网样式
   自适应 PC / 移动端
   ============================================================ */

:root {
  --primary: #2B6BF3;
  --primary-dark: #1E4FD6;
  --primary-light: #EAF1FF;
  --grad: linear-gradient(135deg, #2B6BF3 0%, #6C5CE7 100%);
  --accent: #FF5A3C;
  --accent-2: #FFB020;
  --success: #22C55E;
  --text: #1B2A4A;
  --text-2: #5A6B8C;
  --text-3: #8A99B8;
  --bg: #FFFFFF;
  --bg-soft: #F6F9FF;
  --bg-dark: #0F1B3D;
  --line: #E6EDF9;
  --shadow: 0 10px 40px rgba(43, 107, 243, .10);
  --shadow-lg: 0 24px 64px rgba(31, 45, 90, .16);
  --radius: 18px;
  --radius-lg: 28px;
  --container: 1200px;
  --nav-h: 72px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 10px); }

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img, svg { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  border-radius: 999px;
  transition: all .28s ease;
  cursor: pointer;
  border: 2px solid transparent;
  white-space: nowrap;
}
.btn svg { flex: 0 0 auto; }
.btn-lg { padding: 15px 34px; font-size: 17px; }
.btn-sm { padding: 8px 18px; font-size: 14px; }
.btn-primary {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 8px 24px rgba(43, 107, 243, .35);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 14px 34px rgba(43, 107, 243, .45); }
.btn-outline { background: #fff; color: var(--primary); border-color: rgba(43, 107, 243, .35); }
.btn-outline:hover { background: var(--primary-light); border-color: var(--primary); transform: translateY(-3px); }
.btn-white { background: #fff; color: var(--primary); box-shadow: 0 8px 24px rgba(0,0,0,.18); }
.btn-white:hover { transform: translateY(-3px); }

/* ---------- 导航栏 ---------- */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 999;
  height: var(--nav-h);
  background: rgba(255,255,255,.86);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: box-shadow .3s, border-color .3s, background .3s;
}
.navbar.scrolled { background: rgba(255,255,255,.96); border-color: var(--line); box-shadow: 0 6px 24px rgba(15,27,61,.06); }
.nav-inner { display: flex; align-items: center; height: var(--nav-h); gap: 28px; }
.logo { display: flex; align-items: center; gap: 10px; font-size: 21px; font-weight: 800; letter-spacing: .5px; }
.logo .logo-mark {
  width: 40px; height: 40px; border-radius: 12px; background: var(--grad);
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 6px 16px rgba(43,107,243,.35);
}
.logo small { display: block; font-size: 11px; font-weight: 500; color: var(--text-3); letter-spacing: 1px; line-height: 1.2; }
.nav-links { display: flex; gap: 6px; margin-left: auto; }
.nav-links a {
  padding: 8px 14px; border-radius: 999px; font-size: 15px; color: var(--text-2);
  transition: all .25s; font-weight: 500;
}
.nav-links a:hover, .nav-links a.active { color: var(--primary); background: var(--primary-light); }
.nav-download { margin-left: 4px; }
.nav-toggle {
  display: none; background: none; border: none; cursor: pointer;
  width: 44px; height: 44px; border-radius: 10px; margin-left: auto;
}
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--text); margin: 5px auto; border-radius: 2px; transition: all .3s; }
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: calc(var(--nav-h) + 64px) 0 90px;
  background:
    radial-gradient(900px 500px at 88% -10%, rgba(108,92,231,.16), transparent 60%),
    radial-gradient(700px 420px at -10% 30%, rgba(43,107,243,.13), transparent 60%),
    linear-gradient(180deg, #F2F7FF 0%, #FFFFFF 100%);
  overflow: hidden;
}
.hero-inner { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,.8); border: 1px solid var(--line);
  color: var(--primary); font-weight: 600; font-size: 14px;
  padding: 7px 16px; border-radius: 999px; box-shadow: var(--shadow);
}
.hero-badge::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--success); box-shadow: 0 0 0 4px rgba(34,197,94,.18); }
.hero h1 { font-size: clamp(34px, 4.6vw, 56px); line-height: 1.22; font-weight: 800; margin: 22px 0 20px; letter-spacing: .5px; }
.hero h1 em { font-style: normal; background: linear-gradient(120deg, var(--accent) 20%, var(--accent-2) 80%); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.hero-sub { font-size: 17px; color: var(--text-2); max-width: 520px; margin-bottom: 32px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 40px; }
.hero-stats { display: flex; gap: 0; }
.hero-stats > div { flex: 1; min-width: 0; padding: 6px 20px; border-left: 1px solid var(--line); }
.hero-stats > div:first-child { padding-left: 0; border-left: 0; }
.hero-stats strong { display: block; font-size: clamp(24px, 3vw, 34px); font-weight: 800; color: var(--primary); line-height: 1.2; }
.hero-stats span { font-size: 13px; color: var(--text-3); }

/* Hero 视觉 —— 手机 */
.hero-visual { position: relative; display: flex; justify-content: center; }
.hero-glow { position: absolute; width: 380px; height: 380px; border-radius: 50%; background: radial-gradient(circle, rgba(43,107,243,.35), transparent 65%); filter: blur(30px); top: 8%; left: 50%; transform: translateX(-50%); z-index: 0; }
.phone {
  position: relative; z-index: 1;
  width: 300px; background: #0E1630; border-radius: 46px; padding: 12px;
  box-shadow: 0 40px 90px rgba(15,27,61,.4), inset 0 0 0 2px rgba(255,255,255,.06);
}
.phone-notch { width: 120px; height: 26px; background: #0E1630; border-radius: 0 0 16px 16px; position: absolute; top: 0; left: 50%; transform: translateX(-50%); z-index: 3; }
.phone-screen { background: #fff; border-radius: 36px; overflow: hidden; }
.app-top { display: flex; justify-content: space-between; align-items: center; padding: 14px 16px 4px; font-size: 11px; color: #8A99B8; }
.app-dot { width: 6px; height: 6px; border-radius: 50%; background: #2B6BF3; }
.app-head { padding: 10px 16px 6px; }
.app-head h4 { font-size: 16px; font-weight: 800; }
.app-head p { font-size: 11px; color: var(--text-3); }
.app-streak { float: right; background: #FFF4E6; color: #E8890C; font-size: 11px; font-weight: 700; padding: 3px 10px; border-radius: 999px; }
.app-card { background: var(--bg-soft); border-radius: 14px; margin: 8px 12px; padding: 12px; border: 1px solid var(--line); }
.app-card h5 { font-size: 12px; color: var(--text-2); font-weight: 600; margin-bottom: 6px; }
.app-task { display: flex; align-items: center; gap: 8px; margin: 7px 0; }
.app-check { width: 16px; height: 16px; border-radius: 5px; border: 1.5px solid var(--primary); background: var(--primary); display: flex; align-items: center; justify-content: center; flex: 0 0 auto; }
.app-check svg { width: 10px; height: 10px; }
.app-task span { font-size: 12px; color: var(--text); flex: 1; }
.app-task small { font-size: 11px; color: var(--text-3); }
.app-bar { height: 5px; background: #E8EFFB; border-radius: 3px; margin-top: 7px; overflow: hidden; }
.app-bar i { display: block; height: 100%; border-radius: 3px; background: var(--grad); }
.app-kpi { display: flex; gap: 8px; margin: 8px 12px; }
.app-kpi div { flex: 1; background: var(--bg-soft); border: 1px solid var(--line); border-radius: 14px; padding: 9px 10px; }
.app-kpi b { display: block; font-size: 15px; color: var(--primary); }
.app-kpi span { font-size: 10px; color: var(--text-3); }
.app-memory { display: flex; align-items: center; gap: 8px; margin: 0 12px 12px; }
.app-memory .ring { position: relative; width: 40px; height: 40px; flex: 0 0 auto; }
.app-memory .ring svg { transform: rotate(-90deg); }
.app-memory b { font-size: 13px; display: block; }
.app-memory span { font-size: 11px; color: var(--text-3); }

/* 浮动标签 */
.float-card {
  position: absolute; z-index: 2; background: #fff; border-radius: 16px;
  box-shadow: var(--shadow-lg); padding: 12px 16px; display: flex; align-items: center; gap: 10px;
  animation: floaty 5s ease-in-out infinite;
}
.float-card .fc-ic { width: 38px; height: 38px; border-radius: 11px; display: flex; align-items: center; justify-content: center; flex: 0 0 auto; }
.float-card b { display: block; font-size: 14px; }
.float-card span { font-size: 11px; color: var(--text-3); }
.fc-1 { top: 6%; left: 2%; animation-delay: .4s; }
.fc-2 { bottom: 16%; right: 0; animation-delay: 1.6s; }
@keyframes floaty { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-14px); } }

/* ---------- 通用区块 ---------- */
.section { padding: 96px 0; }
.section-head { text-align: center; max-width: 700px; margin: 0 auto 56px; }
.section-eyebrow {
  display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: 2px;
  color: var(--primary); text-transform: uppercase; margin-bottom: 12px;
}
.section-head h2 { font-size: clamp(26px, 3.4vw, 40px); font-weight: 800; line-height: 1.3; }
.section-head h2 em { font-style: normal; color: var(--primary); }
.section-head p { margin-top: 14px; color: var(--text-2); font-size: 16px; }

/* ---------- 痛点 ---------- */
.pain { background: var(--bg-soft); }
.pain-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.pain-card {
  background: #fff; border-radius: var(--radius); padding: 34px 28px;
  border: 1px solid var(--line); transition: all .3s; position: relative; overflow: hidden;
}
.pain-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.pain-card .pc-num { font-size: 40px; font-weight: 800; color: #EDF2FC; position: absolute; top: 10px; right: 18px; }
.pain-card h3 { font-size: 19px; margin-bottom: 12px; display: flex; align-items: center; gap: 10px; }
.pain-card p { color: var(--text-2); font-size: 15px; }
.pain-ic { width: 46px; height: 46px; border-radius: 13px; background: var(--primary-light); display: flex; align-items: center; justify-content: center; flex: 0 0 auto; }
.pain-fix { margin-top: 16px; display: inline-flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 600; color: var(--success); background: rgba(34,197,94,.1); padding: 5px 12px; border-radius: 999px; }

/* ---------- 核心功能 ---------- */
.features { background: #fff; }
.feature-row {
  display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center;
  padding: 40px 0;
}
.feature-row + .feature-row { border-top: 1px solid var(--line); }
.feature-text .f-tag {
  display: inline-flex; align-items: center; gap: 6px; font-size: 12px; font-weight: 700;
  letter-spacing: 1px; color: var(--primary); background: var(--primary-light);
  padding: 5px 12px; border-radius: 999px; margin-bottom: 16px;
}
.feature-text h3 { font-size: clamp(22px, 2.6vw, 30px); font-weight: 800; margin-bottom: 14px; line-height: 1.35; }
.feature-text p { color: var(--text-2); font-size: 15.5px; margin-bottom: 18px; }
.feature-points li { display: flex; gap: 10px; margin: 10px 0; color: var(--text-2); font-size: 15px; align-items: flex-start; }
.feature-points svg { flex: 0 0 auto; margin-top: 3px; }
.feature-visual { position: relative; display: flex; justify-content: center; }
.fv-panel {
  width: 100%; max-width: 520px; background: var(--bg-soft); border: 1px solid var(--line);
  border-radius: var(--radius-lg); padding: 26px; box-shadow: var(--shadow); position: relative;
}
.fv-panel h4 { font-size: 15px; font-weight: 700; margin-bottom: 4px; }
.fv-panel .fv-sub { font-size: 12px; color: var(--text-3); margin-bottom: 16px; }
.fv-strip { display: flex; align-items: center; gap: 12px; background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 12px 14px; margin: 10px 0; }
.fv-strip .fv-ic { width: 38px; height: 38px; border-radius: 10px; display: flex; align-items: center; justify-content: center; flex: 0 0 auto; }
.fv-strip div { flex: 1; min-width: 0; }
.fv-strip b { font-size: 13.5px; display: block; }
.fv-strip small { font-size: 11.5px; color: var(--text-3); }
.fv-chip { font-size: 11px; font-weight: 700; padding: 3px 10px; border-radius: 999px; }
.fv-chip.ok { background: rgba(34,197,94,.12); color: var(--success); }
.fv-chip.ing { background: rgba(255,176,32,.15); color: #D97706; }
.fv-chip.warn { background: rgba(255,90,60,.12); color: var(--accent); }

/* ---------- 四维画像 ---------- */
.profile { background: var(--bg-dark); position: relative; overflow: hidden; color: #fff; }
.profile::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(600px 400px at 85% 15%, rgba(108,92,231,.28), transparent 60%),
    radial-gradient(500px 360px at 10% 90%, rgba(43,107,243,.32), transparent 60%);
}
.profile .container { position: relative; z-index: 1; }
.profile .section-head h2 { color: #fff; }
.profile .section-head p { color: #A9B6D4; }
.profile .section-eyebrow { color: #8FA5FF; }
.profile-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.radar-wrap { background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.12); border-radius: var(--radius-lg); padding: 30px; }
.radar-title { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.radar-title h4 { font-size: 16px; }
.radar-legend { display: flex; gap: 16px; font-size: 12px; color: #A9B6D4; margin-top: 10px; justify-content: center; }
.radar-legend span { display: inline-flex; align-items: center; gap: 6px; }
.radar-legend i { width: 10px; height: 10px; border-radius: 3px; display: inline-block; }
.profile-dims { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 22px; }
.dim-card { background: rgba(255,255,255,.07); border: 1px solid rgba(255,255,255,.12); border-radius: 16px; padding: 18px; transition: all .3s; }
.dim-card:hover { background: rgba(255,255,255,.12); transform: translateY(-4px); }
.dim-card .dim-ic { width: 42px; height: 42px; border-radius: 11px; display: flex; align-items: center; justify-content: center; margin-bottom: 12px; }
.dim-card h4 { font-size: 15.5px; margin-bottom: 6px; }
.dim-card p { font-size: 13px; color: #A9B6D4; }
.dim-bar { height: 6px; background: rgba(255,255,255,.12); border-radius: 3px; margin-top: 12px; overflow: hidden; }
.dim-bar i { display: block; height: 100%; border-radius: 3px; }

/* ---------- 学习路径 ---------- */
.how { background: var(--bg-soft); }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; position: relative; }
.steps::before {
  content: ""; position: absolute; top: 40px; left: 12%; right: 12%;
  height: 2px; background: repeating-linear-gradient(90deg, var(--primary) 0 10px, transparent 10px 20px); opacity: .25;
}
.step { text-align: center; position: relative; }
.step-num {
  width: 80px; height: 80px; margin: 0 auto 20px; border-radius: 50%;
  background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow);
  display: flex; align-items: center; justify-content: center; position: relative; z-index: 1;
}
.step-num span { font-size: 26px; font-weight: 800; color: var(--primary); }
.step h3 { font-size: 20px; margin-bottom: 10px; }
.step p { color: var(--text-2); font-size: 14.5px; max-width: 280px; margin: 0 auto; }

/* ---------- 案例 ---------- */
.testimonial { background: #fff; }
.t-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.t-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 30px 26px; box-shadow: 0 4px 18px rgba(15,27,61,.04); transition: all .3s; position: relative; }
.t-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.t-card::before { content: "“"; position: absolute; top: 6px; right: 22px; font-size: 72px; font-weight: 800; color: var(--primary-light); font-family: Georgia, serif; line-height: 1; }
.t-quote { font-size: 15px; color: var(--text-2); margin-bottom: 18px; position: relative; z-index: 1; }
.t-delta { display: inline-block; font-size: 14px; font-weight: 800; color: var(--accent); background: rgba(255,90,60,.1); padding: 4px 12px; border-radius: 999px; margin-bottom: 14px; }
.t-user { display: flex; align-items: center; gap: 12px; }
.t-avatar { width: 44px; height: 44px; border-radius: 50%; background: var(--grad); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 16px; flex: 0 0 auto; }
.t-user b { display: block; font-size: 15px; }
.t-user small { font-size: 12.5px; color: var(--text-3); }

/* ---------- 价格 ---------- */
.price { background: var(--bg-soft); }
.price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; align-items: stretch; }
.price-card {
  background: #fff; border-radius: var(--radius-lg); border: 1px solid var(--line);
  padding: 38px 30px; display: flex; flex-direction: column; transition: all .3s; position: relative;
}
.price-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.price-card.hot { background: var(--grad); color: #fff; border: none; box-shadow: 0 24px 56px rgba(43,107,243,.4); transform: scale(1.03); }
.price-card.hot:hover { transform: scale(1.03) translateY(-6px); }
.price-card.hot .price-amount, .price-card.hot .pc-tag, .price-card.hot .pc-item, .price-card.hot .pc-item::before { color: rgba(255,255,255,.9); }
.price-card.hot .pc-item::before { background: rgba(255,255,255,.5); }
.price-card .hot-badge { position: absolute; top: -14px; left: 50%; transform: translateX(-50%); background: var(--accent); color: #fff; font-size: 12.5px; font-weight: 700; padding: 5px 16px; border-radius: 999px; box-shadow: 0 6px 16px rgba(255,90,60,.4); }
.pc-tag { font-size: 15px; font-weight: 700; color: var(--text-2); }
.price-amount { font-size: 46px; font-weight: 800; margin: 14px 0 4px; }
.price-amount small { font-size: 15px; font-weight: 600; color: var(--text-3); }
.price-card.hot .price-amount small { color: rgba(255,255,255,.75); }
.pc-desc { font-size: 13.5px; color: var(--text-3); margin-bottom: 22px; }
.price-card.hot .pc-desc { color: rgba(255,255,255,.7); }
.pc-list { flex: 1; margin-bottom: 26px; }
.pc-item { display: flex; align-items: center; gap: 10px; font-size: 14.5px; margin: 12px 0; color: var(--text-2); position: relative; padding-left: 26px; }
.pc-item::before { content: "✓"; position: absolute; left: 0; width: 17px; height: 17px; border-radius: 50%; background: rgba(34,197,94,.15); color: var(--success); font-size: 11px; font-weight: 800; display: flex; align-items: center; justify-content: center; }
.price-card.hot .pc-item::before { background: rgba(255,255,255,.25); }

/* ---------- 下载区 ---------- */
.download {
  position: relative; padding: 110px 0; overflow: hidden;
  background:
    radial-gradient(800px 420px at 80% 0%, rgba(108,92,231,.25), transparent 60%),
    radial-gradient(700px 400px at 10% 100%, rgba(43,107,243,.3), transparent 60%),
    linear-gradient(135deg, #0F1B3D 0%, #1B2F6E 100%);
  color: #fff; text-align: center;
}
.download .dl-inner { position: relative; z-index: 1; max-width: 780px; margin: 0 auto; }
.download h2 { font-size: clamp(28px, 3.6vw, 42px); font-weight: 800; margin-bottom: 16px; }
.download .dl-sub { color: #A9B6D4; font-size: 16px; margin-bottom: 40px; }
.dl-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 30px; }
.dl-card {
  background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.16);
  border-radius: var(--radius); padding: 30px 26px; text-align: left;
  transition: all .3s; display: flex; gap: 18px; align-items: center;
}
.dl-card:hover { background: rgba(255,255,255,.14); transform: translateY(-4px); border-color: rgba(255,255,255,.3); }
.dl-ic { width: 62px; height: 62px; border-radius: 16px; background: #fff; display: flex; align-items: center; justify-content: center; flex: 0 0 auto; box-shadow: 0 8px 24px rgba(0,0,0,.2); }
.dl-card b { display: block; font-size: 18px; margin-bottom: 4px; }
.dl-card span { font-size: 13px; color: #A9B6D4; }
.dl-meta { font-size: 13px; color: #7D8BB0; display: flex; gap: 22px; justify-content: center; flex-wrap: wrap; margin-top: 8px; }
.dl-meta i { font-style: normal; display: inline-flex; align-items: center; gap: 6px; }

/* ---------- FAQ ---------- */
.faq { background: #fff; }
.faq-list { max-width: 820px; margin: 0 auto; }
.faq-item { border: 1px solid var(--line); border-radius: 16px; margin-bottom: 14px; overflow: hidden; background: #fff; transition: all .3s; }
.faq-item.open { border-color: var(--primary); box-shadow: var(--shadow); }
.faq-q { width: 100%; background: none; border: none; text-align: left; padding: 20px 24px; font-size: 16px; font-weight: 600; color: var(--text); cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 16px; font-family: inherit; }
.faq-q .faq-arrow { transition: transform .3s; color: var(--primary); flex: 0 0 auto; }
.faq-item.open .faq-arrow { transform: rotate(180deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .35s ease; }
.faq-a p { padding: 0 24px 22px; color: var(--text-2); font-size: 15px; }

/* ---------- Footer ---------- */
footer { background: #0C1430; color: #8A9BC4; padding: 56px 0 30px; font-size: 14px; }
.foot-top { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.foot-brand p { margin-top: 14px; font-size: 13.5px; color: #64718F; max-width: 320px; }
.foot-col h5 { color: #fff; font-size: 15px; margin-bottom: 16px; font-weight: 700; }
.foot-col a { display: block; margin: 9px 0; color: #8A9BC4; transition: color .25s; }
.foot-col a:hover { color: #fff; }
.foot-bottom { border-top: 1px solid rgba(255,255,255,.08); padding-top: 22px; display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap; font-size: 12.5px; color: #5D6A8C; }

/* ---------- 移动端悬浮下载 ---------- */
.mobile-float { display: none; }

/* ---------- 滚动动画 ---------- */
.reveal { opacity: 0; transform: translateY(36px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: .1s; }
.reveal.d2 { transition-delay: .22s; }
.reveal.d3 { transition-delay: .34s; }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; gap: 64px; text-align: center; }
  .hero-sub { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .hero-stats { max-width: 560px; margin: 0 auto; }
  .hero-visual { margin-top: 10px; }
  .fc-1 { left: 4%; }
  .feature-row { gap: 40px; }
  .profile-grid { grid-template-columns: 1fr; }
}

@media (max-width: 860px) {
  .nav-links {
    position: fixed; top: var(--nav-h); left: 0; right: 0;
    flex-direction: column; background: #fff; padding: 18px 24px 24px;
    box-shadow: 0 20px 40px rgba(15,27,61,.12); gap: 4px;
    transform: translateY(-16px); opacity: 0; pointer-events: none;
    transition: all .3s; border-bottom: 1px solid var(--line);
  }
  .nav-links.open { transform: none; opacity: 1; pointer-events: auto; }
  .nav-links a { padding: 13px 16px; font-size: 16px; }
  .nav-toggle { display: block; }
  .nav-download { display: none; }
}

@media (max-width: 768px) {
  .section { padding: 64px 0; }
  .container { padding: 0 18px; }
  .pain-grid { grid-template-columns: 1fr; }
  .feature-row { grid-template-columns: 1fr; gap: 36px; padding: 28px 0; }
  .feature-row .feature-text { order: 1; }
  .feature-row .feature-visual { order: 2; }
  .steps { grid-template-columns: 1fr; gap: 40px; }
  .steps::before { display: none; }
  .t-grid { grid-template-columns: 1fr; }
  .price-grid { grid-template-columns: 1fr; max-width: 420px; margin: 0 auto; }
  .price-card.hot { transform: none; }
  .price-card.hot:hover { transform: translateY(-6px); }
  .foot-top { grid-template-columns: 1fr 1fr; gap: 28px; }
  .profile-dims { grid-template-columns: 1fr; }
  .dl-cards { grid-template-columns: 1fr; }
  .hero-stats > div { padding: 6px 12px; }
  .mobile-float {
    display: flex; position: fixed; left: 16px; right: 16px; bottom: 16px; z-index: 998;
  }
  .mobile-float a {
    flex: 1; display: flex; align-items: center; justify-content: center; gap: 8px;
    background: var(--grad); color: #fff; font-weight: 700; font-size: 16px;
    padding: 14px; border-radius: 999px; box-shadow: 0 12px 32px rgba(43,107,243,.45);
  }
  .float-card { display: none; }
  .download { padding: 80px 0; }
}

@media (max-width: 420px) {
  .hero { padding-top: calc(var(--nav-h) + 44px); }
  .hero-stats { gap: 4px; }
  .hero-stats > div { padding: 6px 10px; }
  .btn-lg { padding: 14px 22px; font-size: 15px; }
  .phone { width: 264px; }
}