/* ============================================
   快连官网 - 主样式表
   ============================================ */

/* --- CSS Variables --- */
:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: rgba(255, 255, 255, 0.04);
  --bg-card-hover: rgba(255, 255, 255, 0.08);
  --bg-glass: rgba(17, 24, 39, 0.85);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-blue: #2563eb;
  --accent-blue-light: #3b82f6;
  --accent-cyan: #06b6d4;
  --accent-gradient: linear-gradient(135deg, #2563eb, #06b6d4);
  --accent-gradient-hover: linear-gradient(135deg, #3b82f6, #22d3ee);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-active: rgba(37, 99, 235, 0.5);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(37, 99, 235, 0.15);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 24px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
  --header-height: 72px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--accent-blue-light);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover {
  color: var(--accent-cyan);
}

ul {
  list-style: none;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  line-height: 1.4;
}
.btn-primary {
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: var(--shadow-glow);
}
.btn-primary:hover {
  background: var(--accent-gradient-hover);
  transform: translateY(-2px);
  box-shadow: 0 0 40px rgba(37, 99, 235, 0.3);
  color: #fff;
}
.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}
.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.14);
  color: var(--text-primary);
  transform: translateY(-2px);
}
.btn-lg {
  padding: 18px 40px;
  font-size: 1.1rem;
  border-radius: var(--radius-md);
}
.btn-sm {
  padding: 10px 20px;
  font-size: 0.875rem;
}
.btn-icon {
  width: 32px;
  height: 32px;
  padding: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}
.btn-icon:hover {
  background: rgba(255, 255, 255, 0.14);
  color: var(--text-primary);
}

/* --- Header --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition);
}
.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.header-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
}
.header-logo:hover {
  color: var(--text-primary);
}
.header-logo .logo-icon {
  width: 36px;
  height: 36px;
  background: var(--accent-gradient);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 800;
  color: #fff;
  flex-shrink: 0;
}
.header-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}
.header-nav a {
  color: var(--text-secondary);
  font-size: 0.938rem;
  font-weight: 500;
  transition: color var(--transition);
  position: relative;
}
.header-nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-gradient);
  transition: width var(--transition);
  border-radius: 1px;
}
.header-nav a:hover,
.header-nav a.active {
  color: var(--text-primary);
}
.header-nav a:hover::after,
.header-nav a.active::after {
  width: 100%;
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Mobile menu */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.mobile-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  margin: 5px 0;
  border-radius: 2px;
  transition: all var(--transition);
}

/* --- Hero Section --- */
.hero {
  padding: 140px 0 80px;
  background: linear-gradient(180deg, #0a0e17 0%, #111827 50%, #0a0e17 100%);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(ellipse at 30% 50%, rgba(37, 99, 235, 0.08) 0%, transparent 50%),
              radial-gradient(ellipse at 70% 50%, rgba(6, 182, 212, 0.06) 0%, transparent 50%);
  pointer-events: none;
}
.hero .container {
  position: relative;
  z-index: 1;
}
.hero-content {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  background: rgba(37, 99, 235, 0.15);
  border: 1px solid rgba(37, 99, 235, 0.25);
  border-radius: 100px;
  font-size: 0.813rem;
  font-weight: 500;
  color: var(--accent-blue-light);
  margin-bottom: 24px;
}
.hero-badge-dot {
  width: 6px;
  height: 6px;
  background: #22c55e;
  border-radius: 50%;
  animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}
.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #f8fafc 0%, #60a5fa 50%, #22d3ee 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero p {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 36px;
  line-height: 1.7;
}
.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-top: 60px;
  padding-top: 40px;
  border-top: 1px solid var(--border-color);
}
.hero-stat {
  text-align: center;
}
.hero-stat-number {
  font-size: 2rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-stat-label {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* --- Sections --- */
.section {
  padding: 80px 0;
}
.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 56px;
}
.section-label {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(37, 99, 235, 0.12);
  border-radius: 100px;
  font-size: 0.813rem;
  font-weight: 500;
  color: var(--accent-blue-light);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.section-header h2 {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.3;
}
.section-header p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --- Section backgrounds --- */
.section-dark {
  background: var(--bg-secondary);
}
.section-gradient {
  background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

/* --- Features Grid --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: all var(--transition);
}
.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-active);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}
.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: rgba(37, 99, 235, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}
.feature-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 10px;
}
.feature-card p {
  color: var(--text-secondary);
  font-size: 0.938rem;
  line-height: 1.65;
}

/* --- Download Section --- */
.download-platforms {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.download-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  text-align: center;
  transition: all var(--transition);
}
.download-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-active);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}
.download-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
}
.download-icon.windows { background: rgba(0, 120, 212, 0.15); }
.download-icon.mac { background: rgba(153, 153, 153, 0.15); }
.download-icon.android { background: rgba(60, 185, 111, 0.15); }
.download-icon.ios { background: rgba(142, 142, 147, 0.15); }
.download-icon.linux { background: rgba(248, 190, 55, 0.15); }
.download-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 6px;
}
.download-card p {
  font-size: 0.813rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}
.download-card .btn {
  width: 100%;
}
.download-note {
  text-align: center;
  margin-top: 32px;
  color: var(--text-muted);
  font-size: 0.875rem;
}
.download-note a {
  color: var(--accent-blue-light);
}

/* --- Pricing --- */
.pricing-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 40px;
}
.pricing-toggle span {
  font-size: 0.938rem;
  color: var(--text-secondary);
  font-weight: 500;
}
.pricing-toggle span.active {
  color: var(--text-primary);
}
.toggle-switch {
  width: 48px;
  height: 26px;
  background: rgba(255, 255, 255, 0.12);
  border-radius: 13px;
  position: relative;
  cursor: pointer;
  transition: background var(--transition);
}
.toggle-switch.active {
  background: var(--accent-blue);
}
.toggle-switch::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 20px;
  height: 20px;
  background: #fff;
  border-radius: 50%;
  transition: transform var(--transition);
}
.toggle-switch.active::after {
  transform: translateX(22px);
}
.pricing-badge {
  font-size: 0.75rem;
  padding: 2px 10px;
  background: var(--accent-gradient);
  border-radius: 100px;
  color: #fff;
  font-weight: 600;
  margin-left: 6px;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  text-align: center;
  transition: all var(--transition);
  position: relative;
}
.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}
.pricing-card.featured {
  border-color: var(--accent-blue);
  background: rgba(37, 99, 235, 0.06);
}
.pricing-card.featured::before {
  content: '推荐';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  padding: 3px 16px;
  background: var(--accent-gradient);
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  color: #fff;
}
.pricing-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
}
.pricing-type {
  font-size: 0.813rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}
.pricing-price {
  font-size: 2.25rem;
  font-weight: 800;
  margin-bottom: 4px;
}
.pricing-price .currency {
  font-size: 1.2rem;
  font-weight: 600;
}
.pricing-price .period {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--text-muted);
}
.pricing-saving {
  font-size: 0.813rem;
  color: #22c55e;
  font-weight: 500;
  margin-bottom: 20px;
}
.pricing-features {
  text-align: left;
  margin: 20px 0;
  padding: 0;
}
.pricing-features li {
  padding: 8px 0;
  font-size: 0.875rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--border-color);
}
.pricing-features li:last-child {
  border-bottom: none;
}
.pricing-features li::before {
  content: '✓';
  color: #22c55e;
  font-weight: 700;
  flex-shrink: 0;
}
.pricing-card .btn {
  width: 100%;
  margin-top: 8px;
}

/* --- FAQ --- */
.faq-list {
  max-width: 760px;
  margin: 0 auto;
}
.faq-item {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color var(--transition);
}
.faq-item:hover {
  border-color: rgba(255, 255, 255, 0.15);
}
.faq-item.active {
  border-color: var(--border-active);
}
.faq-question {
  width: 100%;
  padding: 18px 24px;
  background: var(--bg-card);
  border: none;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
  font-family: var(--font-sans);
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  transition: background var(--transition);
}
.faq-question:hover {
  background: var(--bg-card-hover);
}
.faq-question::after {
  content: '+';
  font-size: 1.3rem;
  color: var(--text-muted);
  flex-shrink: 0;
  transition: transform var(--transition);
}
.faq-item.active .faq-question::after {
  content: '−';
  transform: rotate(180deg);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.faq-answer-inner {
  padding: 0 24px 20px;
  color: var(--text-secondary);
  font-size: 0.938rem;
  line-height: 1.7;
}
.faq-item.active .faq-answer {
  max-height: 400px;
}

/* --- About / Company --- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.about-text h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 16px;
}
.about-text p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 16px;
}
.about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.about-stat {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 24px;
  text-align: center;
}
.about-stat-num {
  font-size: 2rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.about-stat-label {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* --- Steps --- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  counter-reset: step;
}
.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px;
  text-align: center;
  position: relative;
}
.step-number {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
  margin: 0 auto 16px;
}
.step-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
}
.step-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* --- Testimonials --- */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px;
}
.testimonial-stars {
  color: #f59e0b;
  margin-bottom: 12px;
  font-size: 0.875rem;
}
.testimonial-text {
  color: var(--text-secondary);
  font-size: 0.938rem;
  line-height: 1.65;
  margin-bottom: 16px;
  font-style: italic;
}
.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}
.testimonial-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
}
.testimonial-name {
  font-weight: 600;
  font-size: 0.9rem;
}
.testimonial-source {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* --- CTA Section --- */
.cta-section {
  padding: 80px 0;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(6, 182, 212, 0.08) 100%);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(ellipse at center, rgba(37, 99, 235, 0.06) 0%, transparent 60%);
  pointer-events: none;
}
.cta-section .container {
  position: relative;
  z-index: 1;
}
.cta-section h2 {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.cta-section p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 32px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

/* --- Footer --- */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 60px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand p {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-top: 12px;
  max-width: 300px;
  line-height: 1.6;
}
.footer h4 {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  margin-bottom: 16px;
}
.footer-links li {
  margin-bottom: 10px;
}
.footer-links a {
  color: var(--text-muted);
  font-size: 0.875rem;
  transition: color var(--transition);
}
.footer-links a:hover {
  color: var(--text-primary);
}
.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p {
  color: var(--text-muted);
  font-size: 0.813rem;
}

/* --- 404 Page --- */
.page-404 {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  text-align: center;
  padding: 120px 20px 60px;
}
.page-404 h1 {
  font-size: 6rem;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}
.page-404 h2 {
  font-size: 1.5rem;
  margin-bottom: 12px;
}
.page-404 p {
  color: var(--text-secondary);
  margin-bottom: 24px;
}

/* --- Page Header --- */
.page-header {
  padding: 120px 0 48px;
  text-align: center;
  background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}
.page-header h1 {
  font-size: 2.75rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.page-header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}
.breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 20px;
  font-size: 0.875rem;
  color: var(--text-muted);
}
.breadcrumb a {
  color: var(--text-muted);
}
.breadcrumb a:hover {
  color: var(--text-primary);
}
.breadcrumb .sep {
  color: var(--text-muted);
  font-size: 0.75rem;
}

/* --- Animations --- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .pricing-grid { grid-template-columns: repeat(2, 1fr); }
  .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
  .download-platforms { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .header-nav {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 20px;
    gap: 16px;
    border-bottom: 1px solid var(--border-color);
  }
  .header-nav.open { display: flex; }
  .header-actions .btn { display: none; }
  .mobile-menu-btn { display: block; }

  .hero h1 { font-size: 2.25rem; }
  .hero p { font-size: 1rem; }
  .hero-stats { flex-wrap: wrap; gap: 24px; }
  .hero-stats { flex-direction: column; gap: 16px; }

  .section-header h2 { font-size: 1.75rem; }
  .features-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .testimonials-grid { grid-template-columns: 1fr; }
  .download-platforms { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }

  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }

  .page-header h1 { font-size: 2rem; }
  .pricing-grid { max-width: 400px; margin: 0 auto; }
}

@media (max-width: 480px) {
  html { font-size: 15px; }
  .container { padding: 0 16px; }
  .hero h1 { font-size: 1.85rem; }
  .section { padding: 48px 0; }
  .footer-grid { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: 1fr; }
}