/* ============================================
   小雷达 APP 官网 - 主样式表
   主题：蓝紫渐变 · 现代社交风
   ============================================ */

/* ---------- CSS 变量 ---------- */
:root {
  --primary: #1677ff;
  --primary-dark: #0958d9;
  --primary-light: #e6f4ff;
  --secondary: #722ed1;
  --accent: #ff6b35;
  --accent-hover: #e8552a;
  --gradient-main: linear-gradient(135deg, #1677ff 0%, #722ed1 100%);
  --gradient-hero: linear-gradient(160deg, #0f172a 0%, #1e3a5f 40%, #1677ff 100%);
  --text-dark: #1a1a2e;
  --text-body: #4a5568;
  --text-light: #8b95a7;
  --bg-white: #ffffff;
  --bg-light: #f8fafc;
  --bg-gray: #f1f5f9;
  --border: #e2e8f0;
  --shadow-sm: 0 2px 8px rgba(22, 119, 255, 0.08);
  --shadow-md: 0 8px 30px rgba(22, 119, 255, 0.12);
  --shadow-lg: 0 20px 60px rgba(22, 119, 255, 0.18);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-full: 999px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial,
    sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-body);
  background: var(--bg-white);
  overflow-x: hidden;
}

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

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  font-size: inherit;
}

/* ---------- 通用容器 ---------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-label {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--primary);
  background: var(--primary-light);
  padding: 6px 18px;
  border-radius: var(--radius-full);
  margin-bottom: 18px;
}

.section-title {
  font-size: 38px;
  font-weight: 800;
  color: var(--text-dark);
  line-height: 1.3;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 17px;
  color: var(--text-light);
  max-width: 640px;
  margin: 0 auto;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 6px 20px rgba(255, 107, 53, 0.35);
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(255, 107, 53, 0.45);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  border: 1.5px solid rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(8px);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.22);
  border-color: rgba(255, 255, 255, 0.7);
}

.btn-ghost {
  background: var(--bg-white);
  color: var(--primary);
  border: 1.5px solid var(--primary);
}

.btn-ghost:hover {
  background: var(--primary);
  color: #fff;
}

.btn svg {
  width: 20px;
  height: 20px;
}

/* ============================================
   导航栏
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 18px 0;
  transition: var(--transition);
  background: transparent;
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-sm);
  padding: 12px 0;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 800;
  color: #fff;
  transition: var(--transition);
}

.navbar.scrolled .nav-logo {
  color: var(--text-dark);
}

.nav-logo img {
  width: 38px;
  height: 38px;
  border-radius: 10px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav-links a {
  font-size: 15px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.85);
  position: relative;
}

.navbar.scrolled .nav-links a {
  color: var(--text-body);
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: var(--transition);
  border-radius: 2px;
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-cta {
  padding: 10px 24px;
  font-size: 14px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: var(--transition);
}

.navbar.scrolled .nav-toggle span {
  background: var(--text-dark);
}

/* ============================================
   Hero 区
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--gradient-hero);
  overflow: hidden;
  padding: 140px 0 80px;
}

.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(114, 46, 209, 0.3) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(22, 119, 255, 0.25) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
}

.hero-content {
  color: #fff;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 8px 18px;
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 28px;
  backdrop-filter: blur(8px);
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  background: #4ade80;
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-title {
  font-size: 56px;
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -1px;
}

.hero-title .gradient-text {
  background: linear-gradient(90deg, #60a5fa, #c084fc, #fbbf24);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 22px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.95);
  margin-bottom: 16px;
}

.hero-desc {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.8;
  margin-bottom: 28px;
  max-width: 520px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 36px;
}

.hero-tag {
  padding: 6px 16px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius-full);
  font-size: 13px;
  color: rgba(255, 255, 255, 0.85);
  transition: var(--transition);
}

.hero-tag:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.4);
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.hero-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.55);
  flex-wrap: wrap;
}

.hero-meta span {
  display: flex;
  align-items: center;
  gap: 6px;
}

.hero-meta svg {
  width: 14px;
  height: 14px;
}

/* Hero 手机展示 */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.phone-frame {
  position: relative;
  width: 300px;
  border-radius: 42px;
  padding: 12px;
  background: linear-gradient(145deg, #1e293b, #0f172a);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.1);
  transform: rotate(-3deg);
  transition: var(--transition);
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: rotate(-3deg) translateY(0); }
  50% { transform: rotate(-3deg) translateY(-15px); }
}

.phone-frame:hover {
  transform: rotate(0deg) translateY(-8px);
}

.phone-screen {
  border-radius: 32px;
  overflow: hidden;
  background: #fff;
}

.phone-screen img {
  width: 100%;
  height: auto;
}

.phone-notch {
  position: absolute;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  width: 110px;
  height: 28px;
  background: #0f172a;
  border-radius: 0 0 18px 18px;
  z-index: 3;
}

.hero-float-card {
  position: absolute;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  border-radius: var(--radius-md);
  padding: 14px 20px;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 12px;
  animation: floatCard 4s ease-in-out infinite;
}

.hero-float-card.card-1 {
  top: 15%;
  left: -10%;
  animation-delay: 0s;
}

.hero-float-card.card-2 {
  bottom: 20%;
  right: -8%;
  animation-delay: 1.5s;
}

@keyframes floatCard {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.float-card-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

.float-card-icon.blue { background: var(--primary-light); }
.float-card-icon.purple { background: #f3e8ff; }

.float-card-text strong {
  display: block;
  font-size: 15px;
  color: var(--text-dark);
  font-weight: 700;
}

.float-card-text small {
  font-size: 12px;
  color: var(--text-light);
}

/* ============================================
   数据统计区
   ============================================ */
.stats {
  background: var(--bg-white);
  padding: 70px 0;
  margin-top: -60px;
  position: relative;
  z-index: 5;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}

.stat-item {
  text-align: center;
  padding: 10px;
}

.stat-item:not(:last-child) {
  border-right: 1px solid var(--border);
}

.stat-number {
  font-size: 42px;
  font-weight: 900;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
  margin-bottom: 6px;
}

.stat-number .suffix {
  font-size: 22px;
  font-weight: 700;
}

.stat-label {
  font-size: 14px;
  color: var(--text-light);
  font-weight: 500;
}

/* ============================================
   功能特性区
   ============================================ */
.features {
  background: var(--bg-light);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  border: 1px solid var(--border);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-main);
  transform: scaleX(0);
  transform-origin: left;
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-bottom: 22px;
}

.feature-icon.blue { background: var(--primary-light); }
.feature-icon.purple { background: #f3e8ff; }
.feature-icon.orange { background: #fff7ed; }
.feature-icon.green { background: #f0fdf4; }
.feature-icon.pink { background: #fdf2f8; }
.feature-icon.cyan { background: #ecfeff; }

.feature-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 14.5px;
  color: var(--text-light);
  line-height: 1.8;
}

/* ============================================
   达人探索区
   ============================================ */
.explore {
  background: var(--bg-white);
}

.explore-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-bottom: 40px;
}

.filter-btn {
  padding: 9px 22px;
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-body);
  background: var(--bg-gray);
  border: 1px solid transparent;
  transition: var(--transition);
}

.filter-btn:hover {
  color: var(--primary);
  background: var(--primary-light);
}

.filter-btn.active {
  background: var(--gradient-main);
  color: #fff;
  box-shadow: 0 4px 14px rgba(22, 119, 255, 0.3);
}

.explore-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.talent-card {
  background: var(--bg-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
}

.talent-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.talent-cover {
  position: relative;
  aspect-ratio: 3 / 4;
  overflow: hidden;
  background: var(--bg-gray);
}

.talent-cover .placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
  color: var(--text-light);
}

.talent-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.talent-card:hover .talent-cover img {
  transform: scale(1.06);
}

.talent-badge {
  position: absolute;
  top: 10px;
  right: 10px;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(6px);
  color: #fff;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 4px;
}

.talent-badge svg {
  width: 12px;
  height: 12px;
}

.talent-info {
  padding: 16px;
}

.talent-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.talent-name .new-tag {
  font-size: 10px;
  background: var(--accent);
  color: #fff;
  padding: 2px 7px;
  border-radius: 4px;
  font-weight: 600;
}

.talent-meta {
  display: flex;
  gap: 14px;
  font-size: 12.5px;
  color: var(--text-light);
}

.talent-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.talent-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.talent-tags span {
  font-size: 11px;
  padding: 3px 9px;
  background: var(--bg-gray);
  color: var(--text-light);
  border-radius: var(--radius-full);
}

/* ============================================
   榜单中心区
   ============================================ */
.ranking {
  background: var(--bg-light);
}

.ranking-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 44px;
}

.ranking-tab {
  padding: 10px 28px;
  border-radius: var(--radius-full);
  font-size: 15px;
  font-weight: 600;
  color: var(--text-body);
  background: var(--bg-white);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.ranking-tab:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.ranking-tab.active {
  background: var(--gradient-main);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 16px rgba(22, 119, 255, 0.3);
}

.ranking-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.ranking-panel {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.ranking-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 22px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.ranking-panel-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-dark);
  display: flex;
  align-items: center;
  gap: 8px;
}

.ranking-panel-title .icon {
  font-size: 20px;
}

.ranking-panel-sub {
  font-size: 12px;
  color: var(--text-light);
}

.ranking-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.ranking-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.ranking-item:hover {
  background: var(--bg-light);
}

.ranking-rank {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 800;
  flex-shrink: 0;
  background: var(--bg-gray);
  color: var(--text-light);
}

.ranking-item:nth-child(1) .ranking-rank {
  background: linear-gradient(135deg, #fbbf24, #f59e0b);
  color: #fff;
}

.ranking-item:nth-child(2) .ranking-rank {
  background: linear-gradient(135deg, #94a3b8, #64748b);
  color: #fff;
}

.ranking-item:nth-child(3) .ranking-rank {
  background: linear-gradient(135deg, #fb923c, #ea580c);
  color: #fff;
}

.ranking-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--gradient-main);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 16px;
  flex-shrink: 0;
  overflow: hidden;
}

.ranking-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.ranking-info {
  flex: 1;
  min-width: 0;
}

.ranking-name {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.ranking-value {
  font-size: 12.5px;
  color: var(--text-light);
}

.ranking-trend {
  font-size: 12px;
  font-weight: 600;
  flex-shrink: 0;
}

.ranking-trend.up { color: #22c55e; }
.ranking-trend.down { color: #ef4444; }
.ranking-trend.flat { color: var(--text-light); }

/* ============================================
   最新动态区
   ============================================ */
.activity {
  background: var(--bg-white);
}

.activity-timeline {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}

.activity-timeline::before {
  content: "";
  position: absolute;
  left: 24px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--primary), var(--secondary), transparent);
}

.activity-item {
  display: flex;
  gap: 24px;
  padding: 18px 0;
  position: relative;
}

.activity-dot {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--bg-white);
  border: 2px solid var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
  z-index: 2;
  position: relative;
}

.activity-content {
  flex: 1;
  background: var(--bg-light);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  border: 1px solid var(--border);
}

.activity-time {
  font-size: 12.5px;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 6px;
}

.activity-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 6px;
}

.activity-desc {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.7;
}

/* ============================================
   应用界面预览区
   ============================================ */
.preview {
  background: var(--bg-light);
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.preview-item {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  background: var(--bg-white);
}

.preview-item:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: var(--shadow-lg);
}

.preview-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 9 / 16;
}

.preview-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 20px 16px 16px;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.75), transparent);
  color: #fff;
}

.preview-overlay strong {
  display: block;
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 4px;
}

.preview-overlay span {
  font-size: 12.5px;
  opacity: 0.85;
}

/* ============================================
   下载 CTA 区
   ============================================ */
.download-cta {
  position: relative;
  padding: 100px 0;
  background: var(--gradient-hero);
  overflow: hidden;
  text-align: center;
}

.download-cta::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(114, 46, 209, 0.3) 0%, transparent 50%),
    radial-gradient(circle at 80% 50%, rgba(22, 119, 255, 0.3) 0%, transparent 50%);
  pointer-events: none;
}

.download-cta .container {
  position: relative;
  z-index: 2;
}

.download-cta h2 {
  font-size: 40px;
  font-weight: 900;
  color: #fff;
  margin-bottom: 16px;
}

.download-cta p {
  font-size: 17px;
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: 36px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.download-cta .btn-primary {
  padding: 18px 48px;
  font-size: 18px;
}

.download-cta-meta {
  margin-top: 24px;
  font-size: 13.5px;
  color: rgba(255, 255, 255, 0.55);
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
}

/* ============================================
   FAQ 区
   ============================================ */
.faq {
  background: var(--bg-white);
}

.faq-list {
  max-width: 820px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 28px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-dark);
  text-align: left;
  gap: 16px;
}

.faq-question .faq-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
  transition: var(--transition);
}

.faq-item.open .faq-icon {
  background: var(--primary);
  color: #fff;
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
}

.faq-item.open .faq-answer {
  max-height: 400px;
}

.faq-answer-inner {
  padding: 0 28px 24px;
  font-size: 14.5px;
  color: var(--text-light);
  line-height: 1.9;
}

/* ============================================
   页脚
   ============================================ */
.footer {
  background: #0f172a;
  color: rgba(255, 255, 255, 0.6);
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand img {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  margin-bottom: 16px;
}

.footer-brand h3 {
  font-size: 20px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 10px;
}

.footer-brand p {
  font-size: 13.5px;
  line-height: 1.8;
  max-width: 280px;
}

.footer-col h4 {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 18px;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  font-size: 13.5px;
  color: rgba(255, 255, 255, 0.55);
  transition: var(--transition);
}

.footer-col ul li a:hover {
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 12.5px;
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.5);
}

.footer-bottom a:hover {
  color: #fff;
}

/* ============================================
   回到顶部
   ============================================ */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-main);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: var(--transition);
  z-index: 999;
  font-size: 20px;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* ============================================
   响应式
   ============================================ */
@media (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-tags, .hero-actions, .hero-meta {
    justify-content: center;
  }

  .hero-visual {
    margin-top: 40px;
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .explore-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .preview-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 70px 0;
  }

  .section-title {
    font-size: 28px;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 20px;
    gap: 16px;
    box-shadow: var(--shadow-md);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    color: var(--text-body) !important;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-title {
    font-size: 38px;
  }

  .hero-subtitle {
    font-size: 18px;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .stat-item:nth-child(2) {
    border-right: none;
  }

  .stat-item:nth-child(1),
  .stat-item:nth-child(2) {
    border-bottom: 1px solid var(--border);
    padding-bottom: 20px;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .explore-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .ranking-grid {
    grid-template-columns: 1fr;
  }

  .preview-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .download-cta h2 {
    font-size: 28px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .hero-float-card {
    display: none;
  }

  .phone-frame {
    width: 260px;
  }
}

@media (max-width: 480px) {
  .explore-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .stat-item {
    border-right: none !important;
    border-bottom: 1px solid var(--border);
  }

  .stat-item:last-child {
    border-bottom: none;
  }

  .preview-grid {
    grid-template-columns: 1fr;
  }
}