/* ============================================================
   WinMemoryCleaner 官方网站 - 主样式表
   配色：基于 Logo 四象限（蓝 #00A8F0 / 红 #F01800 / 橙 #F0A800 / 绿 #00C000）
   风格：扁平 · 现代 · 专业
   ============================================================ */

:root {
  /* 主品牌色 */
  --c-blue: #00A8F0;
  --c-blue-dark: #0088C7;
  --c-blue-deep: #0A2540;
  --c-blue-soft: #E6F6FE;
  --c-red: #F01800;
  --c-orange: #F0A800;
  --c-green: #00C000;
  --c-green-dark: #009A00;

  /* 中性色 */
  --c-text: #1A2B3C;
  --c-text-2: #4A5A6A;
  --c-text-3: #8090A0;
  --c-border: #E4EAF0;
  --c-bg: #FFFFFF;
  --c-bg-2: #F6F9FC;
  --c-bg-3: #EEF3F8;

  /* 阴影 */
  --shadow-sm: 0 1px 3px rgba(10, 37, 64, 0.06);
  --shadow-md: 0 4px 16px rgba(10, 37, 64, 0.08);
  --shadow-lg: 0 12px 32px rgba(10, 37, 64, 0.12);
  --shadow-xl: 0 24px 60px rgba(10, 37, 64, 0.18);

  /* 圆角 */
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 16px;
  --r-xl: 24px;
  --r-pill: 999px;

  /* 字体 */
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  /* 布局 */
  --container: 1200px;
  --header-h: 68px;
}

/* ==================== 基础重置 ==================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--c-blue-dark); text-decoration: none; transition: color .2s; }
a:hover { color: var(--c-blue); }

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

ul, ol { padding-left: 1.2em; }

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--c-text);
}

h1 { font-size: clamp(2rem, 5vw, 3.2rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); letter-spacing: -0.01em; }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); }
h4 { font-size: 1.1rem; }

p { color: var(--c-text-2); }

code, pre {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--c-bg-3);
  border-radius: var(--r-sm);
}
code { padding: 2px 6px; color: var(--c-blue-deep); }
pre {
  padding: 16px 20px;
  overflow-x: auto;
  border-left: 3px solid var(--c-blue);
  line-height: 1.6;
}
pre code { padding: 0; background: transparent; color: var(--c-text); }

/* ==================== 容器 ==================== */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.container-narrow { max-width: 880px; }

/* ==================== 区块 ==================== */
section { padding: 80px 0; }
.section-sm { padding: 56px 0; }
.section-lg { padding: 120px 0; }

.bg-2 { background: var(--c-bg-2); }
.bg-3 { background: var(--c-bg-3); }
.bg-blue { background: linear-gradient(135deg, #0A2540 0%, #0088C7 100%); color: #fff; }
.bg-blue h1, .bg-blue h2, .bg-blue h3, .bg-blue p { color: inherit; }

.section-head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.section-head .eyebrow {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-blue);
  background: var(--c-blue-soft);
  padding: 6px 14px;
  border-radius: var(--r-pill);
  margin-bottom: 18px;
}
.section-head h2 { margin-bottom: 16px; }
.section-head p { font-size: 1.05rem; color: var(--c-text-2); }

/* ==================== 按钮 ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.2;
  padding: 13px 28px;
  border-radius: var(--r-pill);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all .2s ease;
  white-space: nowrap;
  text-decoration: none;
}
.btn-primary {
  background: var(--c-blue);
  color: #fff;
  box-shadow: 0 6px 18px rgba(0, 168, 240, 0.35);
}
.btn-primary:hover {
  background: var(--c-blue-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(0, 168, 240, 0.45);
}
.btn-outline {
  background: transparent;
  color: var(--c-blue-dark);
  border-color: var(--c-border);
}
.btn-outline:hover {
  border-color: var(--c-blue);
  color: var(--c-blue);
  background: var(--c-blue-soft);
}
.btn-white {
  background: #fff;
  color: var(--c-blue-dark);
  box-shadow: var(--shadow-md);
}
.btn-white:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); color: var(--c-blue); }
.btn-ghost-light {
  background: rgba(255,255,255,0.1);
  color: #fff;
  border-color: rgba(255,255,255,0.3);
}
.btn-ghost-light:hover { background: rgba(255,255,255,0.2); color: #fff; }
.btn-lg { padding: 16px 36px; font-size: 1.1rem; }
.btn-sm { padding: 9px 18px; font-size: 0.9rem; }

/* ==================== 头部导航 ==================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--c-border);
}
.site-header .container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--c-text);
  flex-shrink: 0;
}
.brand img { width: 32px; height: 32px; }
.brand span { letter-spacing: -0.01em; }
.brand small { display: block; font-size: 0.65rem; font-weight: 500; color: var(--c-text-3); letter-spacing: 0.05em; }

.nav { display: flex; align-items: center; gap: 4px; }
.nav a {
  padding: 8px 14px;
  color: var(--c-text-2);
  font-weight: 500;
  font-size: 0.95rem;
  border-radius: var(--r-sm);
  transition: all .2s;
}
.nav a:hover { color: var(--c-blue); background: var(--c-blue-soft); }
.nav a.active { color: var(--c-blue); font-weight: 600; }

.header-cta { display: flex; align-items: center; gap: 10px; }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
  width: 40px;
  height: 40px;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
}
.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--c-text);
  border-radius: 2px;
  transition: .25s;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ==================== Hero ==================== */
.hero {
  position: relative;
  background: linear-gradient(135deg, #0A2540 0%, #0E3A5C 50%, #0088C7 100%);
  color: #fff;
  padding: 90px 0 100px;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0, 168, 240, 0.35) 0%, transparent 60%);
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -300px;
  left: -200px;
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(240, 168, 0, 0.18) 0%, transparent 60%);
  pointer-events: none;
}
.hero .container {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.22);
  color: #CFEFFF;
  padding: 6px 14px;
  border-radius: var(--r-pill);
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 22px;
  backdrop-filter: blur(8px);
}
.hero-badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--c-green); box-shadow: 0 0 0 4px rgba(0,192,0,0.25); }
.hero h1 { color: #fff; margin-bottom: 20px; }
.hero h1 .grad {
  background: linear-gradient(90deg, #00A8F0, #6FE3FF);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero p.lead {
  font-size: 1.15rem;
  color: #C5DBEA;
  margin-bottom: 32px;
  max-width: 540px;
}
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 36px; }
.hero-meta {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  font-size: 0.9rem;
  color: #A8C4D8;
}
.hero-meta strong { color: #fff; font-size: 1.05rem; }

/* Hero 卡片 - 软件界面模拟 */
.hero-card {
  background: #fff;
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  color: var(--c-text);
  transform: perspective(1000px) rotateY(-6deg) rotateX(2deg);
  transition: transform .4s;
}
.hero-card:hover { transform: perspective(1000px) rotateY(0deg) rotateY(0); }
.hero-card-bar {
  background: var(--c-bg-3);
  padding: 10px 14px;
  display: flex;
  align-items: center;
  gap: 6px;
  border-bottom: 1px solid var(--c-border);
}
.hero-card-bar .dot { width: 11px; height: 11px; border-radius: 50%; }
.hero-card-bar .dot.r { background: #FF5F57; }
.hero-card-bar .dot.y { background: #FEBC2E; }
.hero-card-bar .dot.g { background: #28C840; }
.hero-card-bar .title { margin-left: 12px; font-size: 0.82rem; color: var(--c-text-3); font-weight: 500; }
.hero-card-body { padding: 24px; }
.hero-card-body h4 { margin-bottom: 6px; font-size: 1rem; }
.mem-ring {
  width: 130px;
  height: 130px;
  margin: 8px auto 16px;
  position: relative;
}
.mem-ring svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.mem-ring .pct {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.8rem;
  color: var(--c-text);
}
.mem-ring .pct small { font-size: 0.7rem; font-weight: 500; color: var(--c-text-3); }
.mem-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 14px;
}
.mem-stat {
  background: var(--c-bg-2);
  border-radius: var(--r-sm);
  padding: 10px 12px;
}
.mem-stat .lbl { font-size: 0.72rem; color: var(--c-text-3); }
.mem-stat .val { font-size: 0.95rem; font-weight: 700; color: var(--c-text); }
.hero-card .btn-opt {
  display: block;
  width: 100%;
  margin-top: 16px;
  background: var(--c-blue);
  color: #fff;
  padding: 12px;
  border-radius: var(--r-md);
  font-weight: 700;
  text-align: center;
  border: none;
  cursor: pointer;
}

/* ==================== 数据统计 ==================== */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.stat-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: 28px 24px;
  text-align: center;
  transition: all .25s;
}
.stat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--c-blue); }
.stat-card .num {
  font-size: 2.4rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--c-blue), var(--c-blue-dark));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.1;
  margin-bottom: 6px;
}
.stat-card .num small { font-size: 1.1rem; -webkit-text-fill-color: var(--c-blue-dark); }
.stat-card .lbl { color: var(--c-text-2); font-size: 0.95rem; }

/* ==================== 特性卡片网格 ==================== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: 28px 24px;
  transition: all .25s;
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 3px;
  background: var(--c-blue);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .3s;
}
.feature-card:hover::before { transform: scaleX(1); }
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.feature-card .icon {
  width: 52px;
  height: 52px;
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  font-size: 1.5rem;
  color: #fff;
}
.icon.bg-blue { background: linear-gradient(135deg, #00A8F0, #0088C7); }
.icon.bg-red  { background: linear-gradient(135deg, #FF5252, #F01800); }
.icon.bg-orange { background: linear-gradient(135deg, #FFB020, #F0A800); }
.icon.bg-green { background: linear-gradient(135deg, #28D028, #00C000); }
.feature-card h3 { margin-bottom: 10px; font-size: 1.2rem; }
.feature-card p { font-size: 0.95rem; color: var(--c-text-2); }

/* ==================== 使用场景 ==================== */
.scenarios { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.scenario {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: 28px;
  display: flex;
  gap: 20px;
  transition: all .25s;
}
.scenario:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); border-color: var(--c-blue); }
.scenario .ico {
  flex-shrink: 0;
  width: 56px; height: 56px;
  border-radius: var(--r-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.6rem;
}
.scenario h3 { font-size: 1.15rem; margin-bottom: 8px; }
.scenario p { font-size: 0.93rem; }
.scenario .tag {
  display: inline-block;
  margin-top: 10px;
  font-size: 0.78rem;
  color: var(--c-blue-dark);
  background: var(--c-blue-soft);
  padding: 3px 10px;
  border-radius: var(--r-pill);
  font-weight: 600;
}

/* ==================== 用户评价 ==================== */
.testimonials { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.testimonial {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: 28px;
  position: relative;
  transition: all .25s;
}
.testimonial:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.testimonial .quote-mark {
  position: absolute;
  top: 18px; right: 24px;
  font-size: 3rem;
  font-family: Georgia, serif;
  color: var(--c-blue-soft);
  line-height: 1;
}
.testimonial .stars { color: #F0A800; margin-bottom: 12px; font-size: 0.95rem; letter-spacing: 2px; }
.testimonial p { font-size: 0.97rem; color: var(--c-text); margin-bottom: 18px; font-style: italic; }
.testimonial .who { display: flex; align-items: center; gap: 12px; }
.testimonial .avatar {
  width: 42px; height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--c-blue), var(--c-blue-dark));
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 1rem;
  flex-shrink: 0;
}
.testimonial .who .name { font-weight: 700; font-size: 0.95rem; color: var(--c-text); }
.testimonial .who .role { font-size: 0.82rem; color: var(--c-text-3); }

/* ==================== 步骤 ==================== */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  position: relative;
}
.step {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: 32px 24px;
  text-align: center;
  position: relative;
}
.step .step-num {
  width: 48px; height: 48px;
  margin: 0 auto 18px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--c-blue), var(--c-blue-dark));
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 1.2rem;
  box-shadow: 0 6px 16px rgba(0,168,240,0.3);
}
.step h3 { margin-bottom: 10px; }
.step p { font-size: 0.93rem; }

/* ==================== 表格 ==================== */
.table-wrap {
  overflow-x: auto;
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-sm);
}
table.data {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  min-width: 640px;
}
table.data th {
  background: var(--c-blue-deep);
  color: #fff;
  text-align: left;
  padding: 14px 18px;
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.02em;
}
table.data th:first-child { border-top-left-radius: var(--r-md); }
table.data th:last-child { border-top-right-radius: var(--r-md); }
table.data td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--c-border);
  vertical-align: top;
  color: var(--c-text-2);
}
table.data tbody tr:nth-child(even) { background: var(--c-bg-2); }
table.data tbody tr:hover { background: var(--c-blue-soft); }
table.data td strong { color: var(--c-text); }
table.data .pill {
  display: inline-block;
  padding: 2px 10px;
  border-radius: var(--r-pill);
  font-size: 0.8rem;
  font-weight: 600;
}
.pill-blue { background: var(--c-blue-soft); color: var(--c-blue-dark); }
.pill-green { background: #E6F9E6; color: var(--c-green-dark); }
.pill-orange { background: #FFF4E0; color: #B07700; }
.pill-red { background: #FFE6E0; color: #C01200; }
.pill-gray { background: var(--c-bg-3); color: var(--c-text-2); }

/* ==================== 下载方式卡片 ==================== */
.dl-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.dl-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: all .25s;
  position: relative;
}
.dl-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); border-color: var(--c-blue); }
.dl-card.featured { border-color: var(--c-blue); box-shadow: 0 8px 24px rgba(0,168,240,0.12); }
.dl-card .badge-top {
  position: absolute;
  top: -10px; right: 24px;
  background: var(--c-blue);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: var(--r-pill);
  letter-spacing: 0.05em;
}
.dl-card .head { display: flex; align-items: center; gap: 14px; }
.dl-card .head .logo {
  width: 48px; height: 48px;
  border-radius: var(--r-md);
  background: var(--c-bg-3);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}
.dl-card h3 { font-size: 1.15rem; }
.dl-card .cmd {
  background: var(--c-blue-deep);
  color: #E0F4FF;
  padding: 12px 16px;
  border-radius: var(--r-md);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  overflow-x: auto;
}
.dl-card .cmd .copy {
  background: rgba(255,255,255,0.12);
  border: none;
  color: #fff;
  padding: 4px 10px;
  border-radius: var(--r-sm);
  font-size: 0.78rem;
  cursor: pointer;
  flex-shrink: 0;
  transition: background .2s;
}
.dl-card .cmd .copy:hover { background: rgba(255,255,255,0.25); }
.dl-card .cmd .copy.copied { background: var(--c-green); }
.dl-card .desc { font-size: 0.9rem; color: var(--c-text-2); }
.dl-card .actions { display: flex; gap: 10px; margin-top: auto; }

/* ==================== FAQ 手风琴 ==================== */
.faq-list { max-width: 840px; margin: 0 auto; }
.faq-item {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: box-shadow .2s;
}
.faq-item.open { box-shadow: var(--shadow-md); border-color: var(--c-blue); }
.faq-q {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 18px 22px;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-text);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
.faq-q .arrow {
  flex-shrink: 0;
  width: 24px; height: 24px;
  display: flex; align-items: center; justify-content: center;
  color: var(--c-blue);
  font-size: 1.3rem;
  transition: transform .25s;
}
.faq-item.open .arrow { transform: rotate(45deg); }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height .3s ease;
}
.faq-item.open .faq-a { max-height: 600px; }
.faq-a-inner { padding: 0 22px 20px; color: var(--c-text-2); font-size: 0.95rem; }
.faq-a-inner p + p { margin-top: 10px; }

/* ==================== CTA 横幅 ==================== */
.cta-banner {
  background: linear-gradient(135deg, #0A2540 0%, #0088C7 100%);
  border-radius: var(--r-xl);
  padding: 56px 48px;
  color: #fff;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-banner::before {
  content: '';
  position: absolute;
  top: -100px; right: -100px;
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(0,168,240,0.4), transparent 70%);
}
.cta-banner h2 { color: #fff; margin-bottom: 14px; position: relative; z-index: 1; }
.cta-banner p { color: #C5DBEA; font-size: 1.1rem; margin-bottom: 28px; position: relative; z-index: 1; }
.cta-banner .hero-cta { justify-content: center; position: relative; z-index: 1; }

/* ==================== 页脚 ==================== */
.site-footer {
  background: #0A1929;
  color: #A8B8C8;
  padding: 64px 0 28px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .brand { color: #fff; margin-bottom: 14px; }
.footer-brand p { color: #8A9BAC; font-size: 0.9rem; max-width: 320px; }
.footer-col h5 {
  color: #fff;
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}
.footer-col ul { list-style: none; padding: 0; }
.footer-col li { margin-bottom: 10px; }
.footer-col a {
  color: #8A9BAC;
  font-size: 0.9rem;
  transition: color .2s;
}
.footer-col a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.85rem;
  color: #6A7B8C;
}
.footer-bottom .links { display: flex; gap: 18px; }
.footer-bottom a { color: #8A9BAC; }
.footer-bottom a:hover { color: #fff; }

/* ==================== 下载弹窗 ==================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 25, 40, 0.7);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: opacity .25s, visibility .25s;
}
button { outline: none;}
.modal-overlay.open { opacity: 1; visibility: visible;  left: 0;
  right: 0;
  top: 0;
  bottom: 0;}
.modal {
  background: #fff;
  border-radius: var(--r-xl);
  max-width: 880px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  transform: scale(0.92);
  transition: transform .3s;
  box-shadow: var(--shadow-xl);
}
.modal-overlay.open .modal { transform: scale(1); }
.modal-close {
  position: absolute;
  top: 16px; right: 16px;
  width: 38px; height: 38px;
  border: none;
  background: var(--c-bg-3);
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.3rem;
  color: var(--c-text-2);
  display: flex; align-items: center; justify-content: center;
  transition: all .2s;
  z-index: 2;
}
.modal-close:hover { background: var(--c-red); color: #fff; transform: rotate(90deg); }
.modal-head {
  background: linear-gradient(135deg, #0A2540, #0088C7);
  color: #fff;
  padding: 32px 40px 28px;
  border-radius: var(--r-xl) var(--r-xl) 0 0;
  text-align: center;
}
.modal-head .logo-row {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(255,255,255,0.12);
  padding: 6px 16px;
  border-radius: var(--r-pill);
  font-size: 0.85rem;
  margin-bottom: 14px;
}
.modal-head .logo-row img { width: 22px; height: 22px; }
.modal-head h3 { color: #fff; font-size: 1.5rem; margin-bottom: 6px; }
.modal-head p { color: #C5DBEA; font-size: 0.95rem; }
.modal-body { padding: 36px 40px 40px; }
.qr-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  margin-bottom: 28px;
}
.qr-box {
  text-align: center;
  background: var(--c-bg-2);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: 24px 18px;
  transition: all .2s;
}
.qr-box:hover { box-shadow: var(--shadow-md); border-color: var(--c-blue); }
.qr-box img {
  width: 180px; height: 180px;
  margin: 0 auto 14px;
  border-radius: var(--r-md);
  background: #fff;
  padding: 8px;
}
.qr-box .qr-title { font-weight: 700; color: var(--c-text); font-size: 1rem; margin-bottom: 4px; }
.qr-box .qr-desc { font-size: 0.85rem; color: var(--c-text-3); }
.qr-box .qr-platform {
  display: inline-block;
  margin-top: 8px;
  font-size: 0.78rem;
  color: var(--c-blue-dark);
  background: var(--c-blue-soft);
  padding: 3px 10px;
  border-radius: var(--r-pill);
  font-weight: 600;
}
.modal-also {
  background: var(--c-bg-2);
  border-radius: var(--r-lg);
  padding: 20px 24px;
}
.modal-also h5 { font-size: 0.95rem; margin-bottom: 12px; }
.modal-also .cmds { display: flex; flex-direction: column; gap: 8px; }
.modal-also .cmd-line {
  background: var(--c-blue-deep);
  color: #E0F4FF;
  padding: 8px 14px;
  border-radius: var(--r-sm);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}
.modal-also .cmd-line .copy {
  background: rgba(255,255,255,0.12);
  border: none;
  color: #fff;
  padding: 3px 8px;
  border-radius: var(--r-sm);
  font-size: 0.75rem;
  cursor: pointer;
  flex-shrink: 0;
}
.modal-also .cmd-line .copy:hover { background: rgba(255,255,255,0.25); }
.modal-also .cmd-line .copy.copied { background: var(--c-green); }

/* ==================== 面包屑 ==================== */
.breadcrumb {
  background: var(--c-bg-2);
  padding: 18px 0;
  border-bottom: 1px solid var(--c-border);
  font-size: 0.9rem;
}
.breadcrumb a { color: var(--c-text-3); }
.breadcrumb a:hover { color: var(--c-blue); }
.breadcrumb .sep { margin: 0 8px; color: var(--c-text-3); }
.breadcrumb .current { color: var(--c-text); font-weight: 500; }

/* ==================== 页面标题区 ==================== */
.page-hero {
  background: linear-gradient(135deg, #0A2540 0%, #0E3A5C 60%, #0088C7 100%);
  color: #fff;
  padding: 72px 0 64px;
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  top: -150px; right: -150px;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(0,168,240,0.3), transparent 60%);
}
.page-hero .container { position: relative; z-index: 1; max-width: 880px; }
.page-hero .eyebrow {
  display: inline-block;
  background: rgba(255,255,255,0.12);
  color: #CFEFFF;
  padding: 6px 14px;
  border-radius: var(--r-pill);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 18px;
}
.page-hero h1 { color: #fff; margin-bottom: 16px; }
.page-hero p { color: #C5DBEA; font-size: 1.1rem; max-width: 680px; }

/* ==================== 内容文档样式 ==================== */
.doc { max-width: 880px; margin: 0 auto; }
.doc h2 { margin: 40px 0 16px; padding-bottom: 12px; border-bottom: 2px solid var(--c-blue-soft); }
.doc h2:first-child { margin-top: 0; }
.doc h3 { margin: 28px 0 12px; }
.doc p { margin-bottom: 14px; }
.doc ul, .doc ol { margin-bottom: 14px; color: var(--c-text-2); }
.doc li { margin-bottom: 6px; }
.doc .callout {
  background: var(--c-blue-soft);
  border-left: 4px solid var(--c-blue);
  padding: 16px 20px;
  border-radius: var(--r-sm);
  margin: 20px 0;
}
.doc .callout.warn {
  background: #FFF4E0;
  border-left-color: var(--c-orange);
}
.doc .callout.tip {
  background: #E6F9E6;
  border-left-color: var(--c-green);
}
.doc .callout strong { color: var(--c-text); }

/* ==================== 版本日志 ==================== */
.changelog { max-width: 880px; margin: 0 auto; }
.release {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: 24px 28px;
  margin-bottom: 16px;
  position: relative;
}
.release .ver {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.release .ver-num {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--c-blue-dark);
}
.release .ver-date {
  color: var(--c-text-3);
  font-size: 0.88rem;
}
.release ul { padding-left: 1.2em; color: var(--c-text-2); }
.release li { margin-bottom: 6px; font-size: 0.93rem; }

/* ==================== 滚动入场动画 ==================== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .6s ease, transform .6s ease;
}
.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero-card { transform: none !important; }
  * { scroll-behavior: auto !important; }
}

/* ==================== 工具类 ==================== */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-2 { margin-top: 16px; }
.mt-4 { margin-top: 32px; }
.mb-2 { margin-bottom: 16px; }
.mb-4 { margin-bottom: 32px; }

/* ==================== 响应式 ==================== */
@media (max-width: 980px) {
  .hero .container { grid-template-columns: 1fr; gap: 40px; }
  .hero-card { max-width: 420px; margin: 0 auto; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .feature-grid, .testimonials, .steps { grid-template-columns: repeat(2, 1fr); }
  .scenarios { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    align-items: stretch;
    padding: 16px;
    border-bottom: 1px solid var(--c-border);
    box-shadow: var(--shadow-md);
    transform: translateY(-120%);
    transition: transform .3s;
    z-index: 99;
    gap: 4px;
  }
  .nav.open { transform: translateY(0); }
  .nav a { padding: 12px 14px; }
  .nav-toggle { display: flex; }
  .header-cta .btn-outline { display: none; }
}
@media (max-width: 640px) {
  section { padding: 56px 0; }
  .container { padding: 0 18px; }
  .stats, .feature-grid, .testimonials, .steps, .dl-grid, .qr-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .scenario { flex-direction: column; }
  .cta-banner { padding: 40px 24px; }
  .modal-head, .modal-body { padding: 24px; }
  .hero { padding: 60px 0 70px; }
  .hero-meta { gap: 18px; }
}