/* ================================
   保价精灵 · 首页样式
   风格: 杂志编辑式 + 工具感
   配色: 米色纸张 / 墨黑 / 降价红 / 金色
   ================================ */

:root {
  --bg: #F4EFE6;
  --bg-soft: #EDE5D6;
  --bg-card: #FBF7EE;
  --ink: #141414;
  --ink-2: #2A2A2A;
  --ink-3: #5C5650;
  --line: #1F1B17;
  --line-soft: rgba(20, 20, 20, 0.12);
  --accent: #C73E3A;
  --accent-deep: #8E1F1C;
  --gold: #C39A2E;
  --paper-noise: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='240' height='240'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.08  0 0 0 0 0.07  0 0 0 0 0.06  0 0 0 0.05 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");

  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", serif;
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Consolas, "Liberation Mono", monospace;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  font-size: 16px;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  position: relative;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: var(--paper-noise);
  pointer-events: none;
  z-index: 0;
  opacity: 0.55;
  mix-blend-mode: multiply;
}

a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
em { font-style: normal; }

::selection { background: var(--accent); color: var(--bg); }

/* ============== 导航 ============== */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 40px;
  background: rgba(244, 239, 230, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line-soft);
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand-mark {
  display: block;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  transform: rotate(-3deg);
  box-shadow: 3px 3px 0 var(--ink);
  object-fit: cover;
  transition: transform 0.25s;
}
.brand:hover .brand-mark { transform: rotate(0deg) scale(1.05); }
.brand-mark--sm { width: 28px; height: 28px; box-shadow: 2px 2px 0 var(--ink); }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-name { font-family: var(--font-serif); font-weight: 700; font-size: 18px; }
.brand-en {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ink-3);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-top: 2px;
}

.nav-links {
  display: flex;
  gap: 36px;
  font-size: 14px;
  font-weight: 500;
}
.nav-links a {
  position: relative;
  padding: 4px 0;
  transition: color 0.2s;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -2px;
  width: 0;
  height: 1.5px;
  background: var(--accent);
  transition: all 0.25s;
  transform: translateX(-50%);
}
.nav-links a:hover { color: var(--accent); }
.nav-links a:hover::after { width: 100%; }

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 16px;
  background: var(--ink);
  color: var(--bg);
  font-size: 13px;
  font-weight: 500;
  border-radius: 999px;
  transition: transform 0.2s, background 0.2s;
}
.nav-cta:hover { background: var(--accent); transform: translateY(-1px); }

/* ============== 通用 Section ============== */
.section {
  position: relative;
  z-index: 1;
  max-width: 1280px;
  margin: 0 auto;
  padding: 120px 40px;
}
.section-head {
  display: grid;
  grid-template-columns: auto auto 1fr;
  align-items: end;
  gap: 28px;
  margin-bottom: 80px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--line-soft);
}
.section-num {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-3);
  letter-spacing: 0.1em;
  padding: 6px 10px;
  border: 1px solid var(--line-soft);
  border-radius: 4px;
  align-self: start;
}
.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}
.section-title {
  font-family: var(--font-serif);
  font-size: clamp(40px, 5vw, 64px);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.01em;
}
.section-lead {
  max-width: 480px;
  margin-left: auto;
  color: var(--ink-3);
  font-size: 15px;
  line-height: 1.7;
}

/* ============== Hero ============== */
.hero {
  position: relative;
  z-index: 1;
  max-width: 1280px;
  margin: 0 auto;
  padding: 80px 40px 100px;
}
.hero-meta {
  display: flex;
  gap: 10px;
  margin-bottom: 36px;
}
.tag {
  display: inline-block;
  padding: 5px 12px;
  background: var(--ink);
  color: var(--bg);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  border-radius: 999px;
}
.tag--ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(56px, 9vw, 128px);
  font-weight: 900;
  line-height: 0.98;
  letter-spacing: -0.02em;
  margin-bottom: 32px;
}
.hero-line { display: block; }
.hero-line em {
  font-style: normal;
  position: relative;
  display: inline-block;
}
.hero-line em::after {
  content: "";
  position: absolute;
  left: -2px; right: -2px; bottom: 6%;
  height: 14%;
  background: var(--accent);
  z-index: -1;
  transform: skewX(-6deg);
  opacity: 0.85;
}
.hero-line--accent {
  color: var(--accent);
  font-style: italic;
}

.hero-sub {
  max-width: 560px;
  font-size: 17px;
  line-height: 1.7;
  color: var(--ink-2);
  margin-bottom: 40px;
}

.hero-cta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 80px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 24px;
  font-size: 14px;
  font-weight: 500;
  border-radius: 999px;
  transition: all 0.25s;
  cursor: pointer;
  border: 1.5px solid transparent;
}
.btn--primary {
  background: var(--ink);
  color: var(--bg);
}
.btn--primary:hover {
  background: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 10px 24px -10px rgba(199, 62, 58, 0.5);
}
.btn--ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn--ghost:hover {
  background: var(--ink);
  color: var(--bg);
}
.btn--lg { padding: 18px 32px; font-size: 15px; }

/* Hero 数据条 */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1.5px solid var(--ink);
  border-bottom: 1.5px solid var(--ink);
  padding: 0;
  max-width: 880px;
}
.stat {
  padding: 28px 24px;
  border-right: 1px solid var(--line-soft);
  position: relative;
}
.stat:last-child { border-right: none; }
.stat-num {
  font-family: var(--font-serif);
  font-size: 56px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ink);
  margin-bottom: 10px;
}
.stat-num small {
  font-size: 24px;
  color: var(--accent);
  font-weight: 700;
  margin-left: 2px;
}
.stat-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
}

/* Hero 装饰：降价券 */
.hero-art {
  position: absolute;
  top: 80px;
  right: 40px;
  width: 280px;
  pointer-events: none;
  z-index: 0;
  animation: float 6s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0) rotate(-8deg); }
  50% { transform: translateY(-12px) rotate(-6deg); }
}
.ticket {
  display: flex;
  background: var(--accent);
  color: var(--bg);
  border-radius: 8px;
  overflow: hidden;
  position: relative;
  box-shadow: 8px 8px 0 var(--ink);
  transform: rotate(-6deg);
}
.ticket-left {
  padding: 18px 22px;
  border-right: 2px dashed rgba(244, 239, 230, 0.4);
}
.ticket-amount {
  display: flex;
  align-items: baseline;
  gap: 2px;
  font-family: var(--font-serif);
  font-weight: 900;
  line-height: 1;
}
.ticket-cur { font-size: 22px; }
.ticket-num { font-size: 44px; letter-spacing: -0.02em; }
.ticket-cap {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-top: 6px;
  opacity: 0.85;
}
.ticket-right {
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  min-width: 70px;
}
.ticket-label {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-align: center;
  line-height: 1.3;
}
.ticket-dots {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 6px;
}
.ticket-dots span {
  width: 4px;
  height: 4px;
  background: var(--bg);
  border-radius: 50%;
  opacity: 0.7;
}

/* ============== 介绍 ============== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  max-width: 900px;
  margin: 0 auto;
  border-top: 1px solid var(--ink);
  border-left: 1px solid var(--ink);
}
.feature {
  position: relative;
  padding: 40px 32px 48px;
  background: var(--bg-card);
  border-right: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  transition: background 0.3s, color 0.3s;
  overflow: hidden;
}
.feature:hover {
  background: var(--ink);
  color: var(--bg);
}
.feature:hover .feature-num { color: var(--accent); }
.feature:hover .feature-icon { color: var(--bg); transform: translate(4px, -4px); }
.feature-num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--ink-3);
  letter-spacing: 0.1em;
  margin-bottom: 28px;
  transition: color 0.3s;
}
.feature h3 {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}
.feature p {
  color: var(--ink-3);
  font-size: 14px;
  line-height: 1.7;
  transition: color 0.3s;
}
.feature:hover p { color: var(--bg); opacity: 0.85; }
.feature-icon {
  position: absolute;
  top: 32px;
  right: 32px;
  color: var(--accent);
  transition: all 0.3s;
}
.feature--accent {
  background: var(--accent);
  color: var(--bg);
}
.feature--accent .feature-num { color: var(--bg); opacity: 0.7; }
.feature--accent p { color: var(--bg); opacity: 0.9; }
.feature--accent .feature-icon { color: var(--bg); }
.feature--accent:hover {
  background: var(--ink);
}

/* ============== 安装教程 ============== */
.steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--ink);
}
.step {
  display: grid;
  grid-template-columns: 120px 1fr 280px;
  gap: 48px;
  padding: 56px 0;
  border-bottom: 1px solid var(--ink);
  align-items: center;
  position: relative;
  transition: padding 0.3s;
}
.step:hover { padding-left: 12px; }
.step-num {
  font-family: var(--font-serif);
  font-size: 72px;
  font-weight: 900;
  line-height: 1;
  color: var(--ink);
  letter-spacing: -0.04em;
  -webkit-text-stroke: 1.5px var(--ink);
  color: transparent;
  transition: color 0.3s;
}
.step:hover .step-num { color: var(--accent); }
.step-body h3 {
  font-family: var(--font-serif);
  font-size: 32px;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 14px;
  letter-spacing: -0.01em;
}
.step-body p {
  color: var(--ink-3);
  font-size: 15px;
  line-height: 1.7;
  max-width: 540px;
}
.step-body strong { color: var(--ink); font-weight: 600; }
.step-body a { color: var(--accent); border-bottom: 1.5px solid var(--accent); }
.step-hint {
  margin-top: 16px;
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-3);
}
.kbd {
  display: inline-block;
  padding: 3px 8px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--ink);
  box-shadow: 2px 2px 0 var(--ink);
}

/* 步骤视觉 */
.step-visual {
  position: relative;
  height: 160px;
  border: 1.5px solid var(--ink);
  border-radius: 8px;
  background: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 14px;
  padding: 20px;
  box-shadow: 4px 4px 0 var(--ink);
  transition: transform 0.3s, box-shadow 0.3s;
}
.step:hover .step-visual { transform: translate(-2px, -2px); box-shadow: 6px 6px 0 var(--accent); }

.v-browser { width: 100%; }
.v-bar {
  display: flex;
  gap: 5px;
  margin-bottom: 10px;
}
.v-bar span {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--line-soft);
}
.v-bar span:first-child { background: var(--accent); }
.v-bar span:nth-child(2) { background: var(--gold); }
.v-url {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-3);
  padding: 6px 10px;
  background: var(--bg);
  border-radius: 4px;
  border: 1px solid var(--line-soft);
}

.v-toggle {
  width: 56px;
  height: 30px;
  background: var(--accent);
  border-radius: 999px;
  position: relative;
  border: 1.5px solid var(--ink);
}
.v-toggle-knob {
  position: absolute;
  top: 2px; right: 2px;
  width: 22px; height: 22px;
  background: var(--bg);
  border-radius: 50%;
  border: 1.5px solid var(--ink);
}
.v-toggle-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--ink);
}

.v-folder {
  width: 100px;
  position: relative;
}
.v-folder-tab {
  width: 40px;
  height: 8px;
  background: var(--ink);
  border-radius: 4px 4px 0 0;
  margin-left: 8px;
}
.v-folder-files {
  background: var(--ink);
  border-radius: 0 6px 6px 6px;
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.v-folder-files span {
  height: 4px;
  background: var(--bg);
  border-radius: 2px;
  opacity: 0.6;
}
.v-folder-files span:nth-child(1) { width: 70%; }
.v-folder-files span:nth-child(2) { width: 50%; }
.v-folder-files span:nth-child(3) { width: 60%; }

/* 手机验证码 */
.v-phone {
  width: 110px;
  height: 180px;
  background: var(--ink);
  border-radius: 16px;
  padding: 6px;
  position: relative;
  box-shadow: 4px 4px 0 var(--accent);
}
.v-phone-notch {
  position: absolute;
  top: 6px; left: 50%;
  transform: translateX(-50%);
  width: 36px; height: 12px;
  background: var(--ink);
  border-radius: 0 0 6px 6px;
  z-index: 2;
}
.v-phone-screen {
  width: 100%;
  height: 100%;
  background: var(--bg);
  border-radius: 12px;
  padding: 18px 8px 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  overflow: hidden;
}
.v-phone-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 4px;
  margin-bottom: 4px;
}
.v-phone-signal, .v-phone-battery {
  width: 12px; height: 6px;
  background: var(--ink-3);
  border-radius: 1px;
}
.v-phone-battery { width: 14px; }
.v-phone-logo {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 18px;
  color: var(--accent);
  text-align: center;
  margin: 4px 0 6px;
  letter-spacing: -0.02em;
}
.v-phone-input {
  display: flex;
  align-items: center;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: 8px;
  color: var(--ink-3);
  border-bottom: 1px solid var(--line-soft);
  padding-bottom: 4px;
}
.v-phone-prefix { font-weight: 600; color: var(--ink); }
.v-phone-digits { color: var(--ink); letter-spacing: 0.05em; }
.v-phone-code {
  display: flex;
  gap: 3px;
  justify-content: space-between;
  margin-top: 2px;
}
.v-phone-code span {
  flex: 1;
  height: 16px;
  border: 1px solid var(--ink);
  border-radius: 2px;
  background: var(--bg-card);
}
.v-phone-btn {
  margin-top: auto;
  background: var(--accent);
  color: var(--bg);
  font-family: var(--font-sans);
  font-size: 8px;
  font-weight: 700;
  text-align: center;
  padding: 5px 4px;
  border-radius: 4px;
  letter-spacing: 0.05em;
}

/* ============== 使用说明 ============== */
.qa {
  max-width: 920px;
  border-top: 1px solid var(--ink);
}
.qa-item {
  border-bottom: 1px solid var(--ink);
  transition: background 0.2s;
}
.qa-item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 28px 0;
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.005em;
  transition: padding 0.3s, color 0.2s;
}
.qa-item summary::-webkit-details-marker { display: none; }
.qa-item summary:hover { color: var(--accent); padding-left: 8px; }
.qa-q { flex: 1; }
.qa-icon {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border: 1.5px solid var(--ink);
  border-radius: 50%;
  position: relative;
  transition: background 0.3s, border-color 0.3s;
}
.qa-icon::before, .qa-icon::after {
  content: "";
  position: absolute;
  top: 50%; left: 50%;
  background: var(--ink);
  transition: transform 0.3s, background 0.3s;
}
.qa-icon::before { width: 12px; height: 1.5px; transform: translate(-50%, -50%); }
.qa-icon::after { width: 1.5px; height: 12px; transform: translate(-50%, -50%); }
.qa-item[open] .qa-icon { background: var(--accent); border-color: var(--accent); }
.qa-item[open] .qa-icon::before, .qa-item[open] .qa-icon::after { background: var(--bg); }
.qa-item[open] .qa-icon::after { transform: translate(-50%, -50%) rotate(90deg); }

.qa-a {
  padding: 0 0 28px 0;
  color: var(--ink-3);
  font-size: 15px;
  line-height: 1.8;
  max-width: 720px;
  animation: fadeUp 0.3s ease;
}
.qa-a p { margin-bottom: 8px; }
.qa-a p:last-child { margin-bottom: 0; }
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============== 下载 ============== */
.section--download { padding-top: 60px; }
.download-card {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 60px;
  padding: 64px 56px;
  background: var(--ink);
  color: var(--bg);
  border-radius: 16px;
  position: relative;
  overflow: hidden;
  box-shadow: 12px 12px 0 var(--accent);
}
.download-card::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(199, 62, 58, 0.25), transparent 60%);
  pointer-events: none;
}
.download-left { position: relative; z-index: 1; }
.download-title {
  font-family: var(--font-serif);
  font-size: clamp(40px, 5.5vw, 64px);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 16px 0 20px;
}
.download-sub {
  color: var(--bg);
  opacity: 0.7;
  font-size: 15px;
  line-height: 1.7;
  max-width: 480px;
  margin-bottom: 32px;
}
.download-cta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.download-card .btn--primary { background: var(--accent); }
.download-card .btn--primary:hover { background: var(--bg); color: var(--ink); }
.download-card .btn--ghost { color: var(--bg); border-color: var(--bg); }
.download-card .btn--ghost:hover { background: var(--bg); color: var(--ink); }

.download-right {
  position: relative;
  z-index: 1;
  border-left: 1px solid rgba(244, 239, 230, 0.15);
  padding-left: 60px;
}
.check-list { display: flex; flex-direction: column; gap: 18px; }
.check-list li {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 15px;
  color: var(--bg);
  opacity: 0.9;
}
.check-list .dot {
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  flex-shrink: 0;
}

/* ============== Footer ============== */
.footer {
  position: relative;
  z-index: 1;
  border-top: 1.5px solid var(--ink);
  background: var(--bg-soft);
  padding: 40px;
}
.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 14px;
}
.footer-links { display: flex; gap: 24px; font-size: 13px; }
.footer-links a:hover { color: var(--accent); }
.footer-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: 0.04em;
}

/* ============== 响应式 ============== */
@media (max-width: 960px) {
  .nav { padding: 14px 20px; }
  .nav-links { display: none; }
  .section { padding: 80px 20px; }
  .hero { padding: 60px 20px 80px; }
  .hero-art { display: none; }
  .section-head {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .section-lead { margin-left: 0; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2) { border-right: none; }
  .stat:nth-child(1), .stat:nth-child(2) { border-bottom: 1px solid var(--line-soft); }
  .feature-grid { grid-template-columns: 1fr; }
  .step {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 40px 0;
  }
  .step-num { font-size: 48px; }
  .step-body h3 { font-size: 24px; }
  .step-visual { max-width: 320px; }
  .download-card {
    grid-template-columns: 1fr;
    gap: 40px;
    padding: 40px 28px;
  }
  .download-right {
    border-left: none;
    border-top: 1px solid rgba(244, 239, 230, 0.15);
    padding-left: 0;
    padding-top: 32px;
  }
  .footer-inner { flex-direction: column; align-items: flex-start; gap: 16px; }
}

@media (max-width: 600px) {
  .hero-title { font-size: 48px; }
  .hero-sub br { display: none; }
  .stat-num { font-size: 40px; }
  .qa-item summary { font-size: 18px; padding: 20px 0; }
  .feature h3 { font-size: 22px; }
  .nav-cta span { display: none; }
  .nav-cta { padding: 9px 12px; }
}

/* ============== 入场动画 ============== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}