/* ===== Reset & Base ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
  color: var(--color-text);
  line-height: 1.6;
  background-color: var(--color-bg);
  background-image:
    linear-gradient(rgba(99,102,241,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(99,102,241,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  -webkit-font-smoothing: antialiased;
}

ul, ol { list-style: none; }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }

/* ===== CSS Variables ===== */
:root {
  --color-primary: #0070f3;
  --color-primary-dark: #0056cc;
  --color-primary-light: #e8f4fd;
  --color-accent: #6366f1;
  --color-cyan: #06b6d4;
  --color-purple: #8b5cf6;
  --color-text: #1a1a2e;
  --color-text-secondary: #555;
  --color-text-helper: #999;
  --color-bg: #fff;
  --color-bg-alt: #f7f9fc;
  --color-border: #eaeaea;
  --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.06);
  --shadow-card-hover: 0 12px 32px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 24px rgba(99, 102, 241, 0.2);
  --radius: 12px;
  --max-width: 1200px;
  --header-height: 64px;
}

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 40px;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  transition: box-shadow 0.3s;
}

.header.scrolled {
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.08);
}

.header-logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.ai-badge {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-size: 10px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--color-accent), var(--color-purple));
  padding: 2px 8px;
  border-radius: 10px;
  letter-spacing: 0.5px;
}

.ai-badge-dot {
  width: 6px;
  height: 6px;
  background: #fff;
  border-radius: 50%;
  animation: dotPulse 1.5s ease-in-out infinite;
}

@keyframes dotPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.header-nav {
  display: flex;
  gap: 32px;
}

.header-nav a {
  font-size: 14px;
  color: var(--color-text-secondary);
  transition: color 0.2s;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
}

.header-nav a:hover,
.header-nav a.active {
  color: var(--color-primary);
}

/* ===== Hero ===== */
.hero {
  padding: 280px 24px 240px;
  text-align: center;
  position: relative;
  overflow: hidden;
  background: linear-gradient(160deg, #f8faff 0%, #f0f4ff 30%, #f5f0ff 60%, #faf8ff 100%);
  animation: heroGradient 10s ease-in-out infinite alternate;
  background-size: 200% 200%;
}

@keyframes heroGradient {
  0% { background-position: 0% 0%; }
  50% { background-position: 100% 60%; }
  100% { background-position: 0% 100%; }
}

#particle-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* 柔光光斑 */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 25% 35%, rgba(99,102,241,0.12) 0%, transparent 55%),
    radial-gradient(ellipse at 70% 25%, rgba(0,112,243,0.10) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 70%, rgba(139,92,246,0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 65%, rgba(6,182,212,0.07) 0%, transparent 40%);
  animation: heroBlobs 8s ease-in-out infinite alternate;
}

@keyframes heroBlobs {
  0% { opacity: 0.7; transform: scale(1); }
  100% { opacity: 1; transform: scale(1.06); }
}

/* 网点纹理 */
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(99,102,241,0.08) 1px, transparent 1px);
  background-size: 28px 28px;
  animation: heroDots 25s linear infinite;
}

@keyframes heroDots {
  0% { background-position: 0 0; }
  100% { background-position: 28px 28px; }
}

.hero-content {
  max-width: 720px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: 72px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -2px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 40%, var(--color-cyan) 70%, var(--color-purple) 100%);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: heroFadeUp 0.8s ease forwards, titleShine 4s ease-in-out infinite;
  filter: drop-shadow(0 0 12px rgba(99,102,241,0.2));
}

@keyframes titleShine {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.hero p {
  margin-top: 24px;
  font-size: 24px;
  color: var(--color-text-secondary);
  line-height: 1.5;
  animation: heroFadeUp 0.8s 0.15s ease forwards;
  opacity: 0;
  display: inline-block;
}

.hero p::after {
  content: '|';
  animation: cursorBlink 1s step-end infinite;
  color: var(--color-accent);
  font-weight: 300;
  margin-left: 2px;
}

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

.hero-btns {
  margin-top: 36px;
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  animation: heroFadeUp 0.8s 0.3s ease forwards;
  opacity: 0;
}

@keyframes heroFadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* 悬浮几何装饰 */
.hero-geo {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
}

.hero-geo-1 {
  width: 260px;
  height: 260px;
  border: 1.5px solid rgba(99,102,241,0.12);
  top: 10%;
  left: 8%;
  animation: geoFloat1 8s ease-in-out infinite;
}

.hero-geo-2 {
  width: 160px;
  height: 160px;
  border: 1.5px solid rgba(6,182,212,0.1);
  top: 55%;
  right: 10%;
  animation: geoFloat2 10s ease-in-out infinite;
}

.hero-geo-3 {
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(139,92,246,0.04) 0%, transparent 70%);
  top: 30%;
  right: 25%;
  animation: geoFloat3 12s ease-in-out infinite;
}

@keyframes geoFloat1 {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  50% { transform: translate(20px, -15px) rotate(15deg); }
}

@keyframes geoFloat2 {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  50% { transform: translate(-25px, 10px) rotate(-10deg); }
}

@keyframes geoFloat3 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(15px, -10px) scale(1.1); }
  66% { transform: translate(-10px, 20px) scale(0.9); }
}

/* 向下滚动指示 */
.scroll-indicator {
  position: absolute;
  bottom: 100px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  color: rgba(99,102,241,0.35);
  animation: scrollBounce 2s ease-in-out infinite;
  cursor: default;
}

@keyframes scrollBounce {
  0%, 100% { transform: translateX(-50%) translateY(0); opacity: 0.6; }
  50% { transform: translateX(-50%) translateY(8px); opacity: 1; }
}

/* 底部波浪 */
.hero-wave {
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  z-index: 1;
  color: var(--color-bg);
  line-height: 0;
}

.hero-wave svg {
  width: 100%;
  height: 80px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 48px;
  padding: 0 32px;
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  border-radius: 24px;
  transition: all 0.25s;
  box-shadow: 0 4px 16px rgba(0, 112, 243, 0.3);
  position: relative;
  overflow: hidden;
}

.btn-primary::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  transition: left 0.6s;
}

.btn-primary:hover {
  box-shadow: 0 6px 24px rgba(99, 102, 241, 0.45);
  transform: translateY(-2px);
}

.btn-primary:hover::after {
  left: 100%;
}

/* 按钮呼吸光环 */
@keyframes btnPulse {
  0% { box-shadow: 0 4px 16px rgba(0,112,243,0.3), 0 0 0 0 rgba(99,102,241,0.4); }
  70% { box-shadow: 0 4px 16px rgba(0,112,243,0.3), 0 0 0 12px rgba(99,102,241,0); }
  100% { box-shadow: 0 4px 16px rgba(0,112,243,0.3), 0 0 0 0 rgba(99,102,241,0); }
}

.btn-primary {
  animation: btnPulse 2.5s ease-in-out infinite;
}

.btn-primary:hover {
  animation: none;
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 48px;
  padding: 0 32px;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  background: rgba(255,255,255,0.8);
  border: 1.5px solid var(--color-primary);
  border-radius: 24px;
  transition: all 0.25s;
  backdrop-filter: blur(8px);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(0,112,243,0.3);
}

/* ===== Section Common ===== */
.section {
  padding: 80px 24px;
}

.section-alt {
  background: var(--color-bg-alt);
  position: relative;
  overflow: hidden;
}

.section-alt::before {
  content: '';
  position: absolute;
  top: -30%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(139,92,246,0.06) 0%, transparent 70%);
  pointer-events: none;
  animation: floatBlob 10s ease-in-out infinite alternate;
}

.section-alt::after {
  content: '';
  position: absolute;
  bottom: -20%;
  left: -5%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(6,182,212,0.05) 0%, transparent 70%);
  pointer-events: none;
  animation: floatBlob 8s ease-in-out 2s infinite alternate;
}

@keyframes floatBlob {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(30px, -20px) scale(1.15); }
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-header h2 {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.5px;
  display: inline-block;
  position: relative;
}

.section-header h2::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 3px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transition: width 0.4s ease;
}

.section-header h2:hover::after {
  width: 80px;
}

.section-header p {
  margin-top: 12px;
  color: var(--color-text-helper);
  font-size: 15px;
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

/* ===== Cards Grid ===== */
.cards-grid {
  display: grid;
  gap: 20px;
  max-width: var(--max-width);
  margin: 0 auto;
  overflow: visible;
}

.cards-grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
.cards-grid.cols-2 { grid-template-columns: repeat(2, 1fr); }

/* ===== Card Base ===== */
.card {
  background: #fff;
  border-radius: var(--radius);
  padding: 28px;
  border: 1px solid var(--color-border);
  transition: all 0.3s ease;
  overflow: visible;
  position: relative;
}

.card:hover {
  box-shadow: var(--shadow-card-hover), 0 0 0 2px rgba(0,112,243,0.12);
  transform: translateY(-4px);
  border-color: rgba(0,112,243,0.2);
  z-index: 10;
}

/* 流动渐变边框 */
@keyframes borderFlow {
  0% { background-position: 0% 50%; }
  100% { background-position: 200% 50%; }
}

.card::before,
.ext-card::before,
.browser-card::before,
.app-card::before {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(99,102,241,0.3), rgba(0,112,243,0.2), rgba(99,102,241,0.1), rgba(0,112,243,0.2), rgba(99,102,241,0.3));
  background-size: 200% 100%;
  z-index: -1;
  opacity: 0;
  transition: opacity 0.4s ease;
}

.card:hover::before,
.ext-card:hover::before,
.browser-card:hover::before,
.app-card:hover::before {
  opacity: 1;
  animation: borderFlow 4s linear infinite;
}

.card-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  border-radius: 12px;
}

.card-icon img { width: 28px; height: 28px; }

.card-platform {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}

.card-version {
  font-size: 13px;
  color: var(--color-text-helper);
  margin-bottom: 20px;
}

.card-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 40px;
  padding: 0 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  background: var(--color-primary-light);
  border-radius: 20px;
  transition: all 0.2s;
}

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

/* ===== App Download Card ===== */
.app-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 32px;
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 40px;
  transition: all 0.3s ease;
  position: relative;
}

.app-card:hover {
  box-shadow: var(--shadow-card-hover), 0 0 0 2px rgba(0,112,243,0.12);
  transform: translateY(-4px);
  border-color: rgba(0,112,243,0.2);
}

.app-card-left {
  flex: 1;
}

.app-card-left .card-icon {
  margin-bottom: 12px;
  animation: iconFloat 3s ease-in-out infinite;
}

@keyframes iconFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

.card-badge {
  display: inline-block;
  font-size: 12px;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 2px 10px;
  border-radius: 10px;
  margin-bottom: 8px;
}

.card-desc {
  font-size: 14px;
  color: var(--color-text-helper);
  margin-bottom: 16px;
  line-height: 1.5;
}

.app-card-right {
  flex-shrink: 0;
  text-align: center;
}

.qr-img {
  width: 120px;
  height: 120px;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  display: block;
}

.qr-label {
  display: block;
  font-size: 12px;
  color: var(--color-text-helper);
  margin-top: 6px;
}

/* ===== Extension Card ===== */
.ext-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 32px;
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 24px;
  transition: all 0.3s ease;
  position: relative;
}

.ext-card:hover {
  box-shadow: var(--shadow-card-hover), 0 0 0 2px rgba(0,112,243,0.12);
  transform: translateY(-4px);
  border-color: rgba(0,112,243,0.2);
}

.ext-card-badge {
  position: absolute;
  top: -1px;
  right: 24px;
  padding: 4px 14px;
  font-size: 12px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, #ff6b6b, #ee5a24);
  border-radius: 0 0 8px 8px;
}

.ext-card-icon img {
  width: 56px;
  height: 56px;
}

.ext-card-info {
  flex: 1;
}

.ext-card-name {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 10px;
}

.ext-card-links {
  display: flex;
  gap: 20px;
}

.ext-card-links a {
  font-size: 14px;
  color: var(--color-primary);
  cursor: pointer;
  transition: opacity 0.2s;
}

.ext-card-links a:hover {
  opacity: 0.7;
}

.ext-card-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: flex-end;
}

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 40px;
  padding: 0 24px;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  border-radius: 20px;
  white-space: nowrap;
  transition: all 0.25s;
  box-shadow: 0 4px 12px rgba(0, 112, 243, 0.25);
  position: relative;
  overflow: hidden;
}

.btn-download::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.25), transparent);
  transition: left 0.5s;
}

.btn-download:hover {
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
  transform: translateY(-1px);
}

.btn-download:hover::after {
  left: 100%;
}

.btn-store {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 40px;
  padding: 0 24px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  background: #fff;
  border: 1px solid var(--color-primary);
  border-radius: 20px;
  white-space: nowrap;
  transition: all 0.2s;
}

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

/* ===== Browser Download Card ===== */
.browser-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 24px 28px;
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 20px;
  transition: all 0.3s ease;
  position: relative;
}

.browser-card:hover {
  box-shadow: var(--shadow-card-hover), 0 0 0 2px rgba(0,112,243,0.12);
  transform: translateY(-4px);
  border-color: rgba(0,112,243,0.2);
}

.browser-card-icon img {
  width: 48px;
  height: 48px;
}

.browser-card-name {
  font-size: 18px;
  font-weight: 600;
  flex: 1;
}

.platform-select {
  position: relative;
  cursor: pointer;
}

.platform-select-trigger {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 40px;
  padding: 0 20px;
  font-size: 14px;
  font-weight: 500;
  color: #fff;
  background: var(--color-primary);
  border-radius: 20px;
  transition: all 0.2s;
}

.platform-select-trigger:hover {
  background: var(--color-primary-dark);
}

.platform-select-trigger img {
  width: 12px;
  height: 12px;
}

.platform-dropdown {
  visibility: hidden;
  position: absolute;
  top: 44px;
  right: 0;
  width: 160px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
  padding: 6px 0;
  z-index: 10;
}

.platform-select:hover .platform-dropdown {
  visibility: visible;
}

.platform-dropdown a {
  display: block;
  padding: 10px 16px;
  font-size: 14px;
  color: var(--color-text);
  transition: all 0.15s;
}

.platform-dropdown a:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

/* ===== Tutorial Tabs ===== */
.tutorial-tabs {
  max-width: 1000px;
  margin: 0 auto;
}

.tab-nav {
  display: flex;
  gap: 4px;
  background: #fff;
  border-radius: var(--radius);
  padding: 4px;
  border: 1px solid var(--color-border);
  margin-bottom: 32px;
}

.tab-btn {
  flex: 1;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  background: transparent;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

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

.tab-btn.active {
  color: #fff;
  background: var(--color-primary);
  box-shadow: 0 2px 8px rgba(0, 112, 243, 0.25);
}

.tab-panel {
  display: none;
  animation: fadeIn 0.35s ease;
}

.tab-panel.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== Scroll Reveal ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Tutorial Steps ===== */
.tutorial-video {
  margin-bottom: 28px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.tutorial-video video {
  width: 100%;
  display: block;
}

.step-list {
  counter-reset: step-counter;
}

.step-item {
  display: flex;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--color-border);
}

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

.step-num {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: 50%;
  font-size: 14px;
  font-weight: 700;
  animation: stepPulse 3s ease-in-out infinite;
}

@keyframes stepPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(0,112,243,0.2); }
  50% { box-shadow: 0 0 0 8px rgba(0,112,243,0); }
}

.step-body {
  flex: 1;
}

.step-body p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text);
}

.step-body p b {
  font-weight: 600;
}

.step-body img {
  margin-top: 12px;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  max-width: 100%;
}

.step-action {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  color: var(--color-primary);
  cursor: pointer;
  font-weight: 500;
}

.step-action:hover {
  opacity: 0.7;
}

.step-action svg {
  width: 16px;
  height: 16px;
}

/* ===== FAQ ===== */
.faq-content {
  max-width: 800px;
  margin: 0 auto;
  background: #fff;
  border-radius: var(--radius);
  padding: 32px;
  border: 1px solid var(--color-border);
  line-height: 1.8;
}

.faq-content p {
  margin-bottom: 12px;
  font-size: 15px;
}

.faq-content img {
  margin: 12px 0;
  border-radius: 8px;
  border: 1px solid var(--color-border);
}

.btn-text {
  background-color: rgba(186, 206, 253, 0.7);
  padding: 1px 6px;
  border-radius: 3px;
  font-weight: 500;
}

/* ===== Footer ===== */
.footer {
  text-align: center;
  padding: 40px 24px;
  color: var(--color-text-helper);
  font-size: 13px;
  border-top: 1px solid var(--color-border);
}

/* ===== SVG Icons ===== */
.icon {
  width: 1em;
  height: 1em;
  overflow: hidden;
  vertical-align: -0.15em;
  fill: currentColor;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .cards-grid.cols-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .header {
    padding: 0 20px;
  }

  .header-nav {
    gap: 16px;
  }

  .header-nav a {
    font-size: 13px;
  }

  .hero {
    padding: 200px 20px 160px;
  }

  .hero-geo-1 { width: 150px; height: 150px; }
  .hero-geo-2 { width: 100px; height: 100px; }
  .hero-geo-3 { width: 120px; height: 120px; }
  .scroll-indicator { bottom: 70px; }
  .hero-wave svg { height: 40px; }

  .hero h1 {
    font-size: 40px;
  }

  .hero p {
    font-size: 17px;
  }

  .section {
    padding: 60px 16px;
  }

  .section-header h2 {
    font-size: 26px;
  }

  .cards-grid.cols-4,
  .cards-grid.cols-2 {
    grid-template-columns: 1fr;
  }

  .app-card {
    flex-direction: column;
    text-align: center;
    gap: 24px;
    padding: 24px;
  }

  .app-card-right {
    display: flex;
    align-items: center;
    gap: 16px;
  }

  .qr-img {
    width: 90px;
    height: 90px;
  }

  .ext-card {
    flex-direction: column;
    text-align: center;
    padding: 24px;
  }

  .ext-card-actions {
    align-items: center;
  }

  .ext-card-links {
    justify-content: center;
  }

  .ext-card-badge {
    right: 12px;
  }

  .browser-card {
    flex-direction: column;
    text-align: center;
  }

  .tab-nav {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .tab-btn {
    flex: none;
    padding: 0 16px;
    font-size: 13px;
  }

  .step-item {
    flex-direction: column;
    gap: 10px;
  }

  .hero-btns {
    flex-direction: column;
    align-items: center;
  }

  .btn-primary,
  .btn-outline {
    width: 100%;
    max-width: 280px;
  }

  .faq-content {
    padding: 20px;
  }
}

@media (max-width: 480px) {
  .header-nav {
    gap: 10px;
  }

  .header-nav a {
    font-size: 12px;
  }

  .hero h1 {
    font-size: 32px;
  }

  .section-header h2 {
    font-size: 22px;
  }
}