/* ========================================
   医路同行 - 官网页面样式
   Medical Landing Page Styles
   ======================================== */

/* CSS Variables - Design System */
:root {
  /* Primary Colors */
  --color-primary: #0D7377;
  --color-primary-light: #14919B;
  --color-primary-dark: #095456;
  --color-primary-rgb: 13, 115, 119;

  /* Secondary Colors */
  --color-secondary: #323232;
  --color-accent: #32B67A;
  --color-accent-light: #4ADE80;

  /* Neutral Colors */
  --color-white: #FFFFFF;
  --color-black: #1A1A1A;
  --color-gray-50: #F9FAFB;
  --color-gray-100: #F3F4F6;
  --color-gray-200: #E5E7EB;
  --color-gray-300: #D1D5DB;
  --color-gray-400: #9CA3AF;
  --color-gray-500: #6B7280;
  --color-gray-600: #4B5563;
  --color-gray-700: #374151;
  --color-gray-800: #1F2937;
  --color-gray-900: #111827;

  /* Semantic Colors */
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-error: #EF4444;
  --color-info: #3B82F6;

  /* Typography */
  --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-family-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  --font-family-mono: 'SF Mono', Monaco, 'Cascadia Code', monospace;

  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Spacing */
  --spacing-0: 0;
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 0.75rem;
  --spacing-4: 1rem;
  --spacing-5: 1.25rem;
  --spacing-6: 1.5rem;
  --spacing-8: 2rem;
  --spacing-10: 2.5rem;
  --spacing-12: 3rem;
  --spacing-16: 4rem;
  --spacing-20: 5rem;
  --spacing-24: 6rem;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);

  /* Transitions */
  --transition-fast: 150ms;
  --transition-normal: 250ms;
  --transition-slow: 350ms;
  --transition-base: all var(--transition-normal) ease;

  /* Z-index */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-tooltip: 600;

  /* Container */
  --container-max-width: 1200px;
  --container-padding: var(--spacing-4);
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-gray-700);
  background-color: var(--color-white);
  min-height: 100vh;
  overflow-x: hidden;
}

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

a:hover {
  color: var(--color-primary-light);
  text-decoration: underline;
}

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

ul, ol {
  list-style: none;
}

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

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* Typography Utilities */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-gray-500); }
.text-white { color: var(--color-white); }

.font-bold { font-weight: var(--font-weight-bold); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-medium { font-weight: var(--font-weight-medium); }

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

/* ========================================
   Header / Navigation
   ======================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-fixed);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-gray-100);
  transition: var(--transition-base);
}

.header.scrolled {
  box-shadow: var(--shadow-md);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  text-decoration: none;
}

.logo-img {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-lg);
}

.logo-text {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-gray-800);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-8);
}

.nav-link {
  font-size: var(--font-size-sm);
  color: var(--color-gray-600);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  transition: var(--transition-base);
  position: relative;
}

.nav-link:hover {
  color: var(--color-primary);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: var(--transition-base);
}

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

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--spacing-2);
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-gray-700);
  transition: var(--transition-base);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  background: linear-gradient(135deg, #f0fdfa 0%, #ecfeff 50%, #f0f9ff 100%);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    radial-gradient(at 40% 20%, rgba(13, 115, 119, 0.08) 0px, transparent 50%),
    radial-gradient(at 80% 0%, rgba(49, 182, 122, 0.06) 0px, transparent 50%),
    radial-gradient(at 0% 50%, rgba(13, 115, 119, 0.05) 0px, transparent 50%);
  pointer-events: none;
}

.hero-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-16);
  align-items: center;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-2) var(--spacing-4);
  background: rgba(13, 115, 119, 0.1);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--spacing-6);
}

.hero-badge::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.2); }
}

.hero-title {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-gray-900);
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-6);
}

.hero-title .highlight {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: var(--font-size-lg);
  color: var(--color-gray-600);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-8);
  max-width: 540px;
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-4);
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  padding: var(--spacing-3) var(--spacing-6);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: var(--transition-base);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: var(--color-white);
  box-shadow: 0 4px 14px rgba(13, 115, 119, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(13, 115, 119, 0.45);
  text-decoration: none;
  color: var(--color-white);
}

.btn-secondary {
  background: var(--color-white);
  color: var(--color-gray-700);
  border: 1px solid var(--color-gray-200);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  text-decoration: none;
}

.btn-lg {
  padding: var(--spacing-4) var(--spacing-8);
  font-size: var(--font-size-lg);
}

.btn-sm {
  padding: var(--spacing-2) var(--spacing-4);
  font-size: var(--font-size-sm);
}

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-phone {
  position: relative;
  width: 280px;
  height: 560px;
  background: var(--color-gray-900);
  border-radius: 40px;
  padding: 12px;
  box-shadow: 
    0 0 0 2px var(--color-gray-800),
    0 25px 50px -12px rgba(0, 0, 0, 0.4),
    inset 0 0 0 1px rgba(255, 255, 255, 0.1);
}

.hero-phone-screen {
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, #0D7377 0%, #14919B 50%, #0D7377 100%);
  border-radius: 30px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  text-align: center;
  padding: var(--spacing-4);
}

.hero-phone-icon {
  font-size: 48px;
  margin-bottom: var(--spacing-4);
}

.hero-phone-text {
  font-size: var(--font-size-sm);
  opacity: 0.9;
}

.hero-phone-badge {
  position: absolute;
  top: 50%;
  right: -60px;
  transform: translateY(-50%);
  background: var(--color-white);
  padding: var(--spacing-3) var(--spacing-4);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  font-size: var(--font-size-xs);
  color: var(--color-gray-700);
}

.hero-phone-badge::before {
  content: '';
  position: absolute;
  left: -8px;
  top: 50%;
  transform: translateY(-50%);
  border: 8px solid transparent;
  border-right-color: var(--color-white);
}

/* ========================================
   Features Section
   ======================================== */
.features {
  padding: var(--spacing-24) 0;
  background: var(--color-white);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-16);
}

.section-label {
  display: inline-block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--spacing-4);
}

.section-title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-4);
}

.section-description {
  font-size: var(--font-size-lg);
  color: var(--color-gray-500);
  max-width: 600px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-8);
}

.feature-card {
  padding: var(--spacing-8);
  background: var(--color-white);
  border: 1px solid var(--color-gray-100);
  border-radius: var(--radius-xl);
  transition: var(--transition-base);
}

.feature-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.feature-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(13, 115, 119, 0.1) 0%, rgba(13, 115, 119, 0.05) 100%);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-5);
  font-size: 28px;
}

.feature-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-3);
}

.feature-description {
  font-size: var(--font-size-base);
  color: var(--color-gray-500);
  line-height: var(--line-height-relaxed);
}

/* ========================================
   About / Stats Section
   ======================================== */
.about {
  padding: var(--spacing-24) 0;
  background: linear-gradient(135deg, var(--color-gray-50) 0%, var(--color-white) 100%);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-16);
  align-items: center;
}

.about-image {
  position: relative;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-image-placeholder {
  color: var(--color-white);
  text-align: center;
  padding: var(--spacing-8);
}

.about-image-placeholder svg {
  width: 80px;
  height: 80px;
  margin-bottom: var(--spacing-4);
  opacity: 0.8;
}

.about-content h2 {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-6);
}

.about-content p {
  font-size: var(--font-size-lg);
  color: var(--color-gray-600);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-6);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-6);
  margin-top: var(--spacing-8);
}

.stat-item {
  text-align: center;
}

.stat-value {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  margin-bottom: var(--spacing-1);
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
}

/* ========================================
   Download Section
   ======================================== */
.download {
  padding: var(--spacing-24) 0;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  text-align: center;
}

.download h2 {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-4);
}

.download p {
  font-size: var(--font-size-lg);
  opacity: 0.9;
  margin-bottom: var(--spacing-10);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.download-buttons {
  display: flex;
  justify-content: center;
  gap: var(--spacing-4);
  flex-wrap: wrap;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-3);
  padding: var(--spacing-4) var(--spacing-8);
  background: var(--color-white);
  color: var(--color-primary);
  border-radius: var(--radius-lg);
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
  transition: var(--transition-base);
}

.download-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  text-decoration: none;
  color: var(--color-primary-dark);
}

.download-btn svg {
  width: 24px;
  height: 24px;
}

.download-app-store {
  margin-top: var(--spacing-8);
}

.download-app-store img {
  height: 48px;
  border-radius: var(--radius-md);
}

/* ========================================
   Footer
   ======================================== */
.footer {
  background: var(--color-gray-900);
  color: var(--color-gray-400);
  padding: var(--spacing-16) 0 var(--spacing-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--spacing-12);
  margin-bottom: var(--spacing-12);
}

.footer-brand {
  max-width: 320px;
}

.footer-brand .logo-text {
  color: var(--color-white);
  margin-bottom: var(--spacing-4);
}

.footer-brand p {
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-6);
}

.footer-title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-white);
  margin-bottom: var(--spacing-6);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
}

.footer-link {
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
  text-decoration: none;
  transition: var(--transition-base);
}

.footer-link:hover {
  color: var(--color-white);
  text-decoration: none;
}

.footer-contact p {
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-2);
}

.footer-contact a {
  color: var(--color-gray-400);
}

.footer-bottom {
  padding-top: var(--spacing-8);
  border-top: 1px solid var(--color-gray-800);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-4);
}

.footer-copyright {
  font-size: var(--font-size-sm);
}

.footer-legal {
  display: flex;
  gap: var(--spacing-6);
}

.footer-legal a {
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
  text-decoration: none;
}

.footer-legal a:hover {
  color: var(--color-white);
}

/* ========================================
   Legal Pages (Privacy & Terms)
   ======================================== */
.legal-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.legal-header {
  padding: var(--spacing-8) 0;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-gray-100);
}

.legal-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.legal-content {
  flex: 1;
  padding: var(--spacing-12) 0;
  background: var(--color-white);
}

.legal-content .container {
  max-width: 800px;
}

.legal-title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-8);
  text-align: center;
}

.legal-section {
  margin-bottom: var(--spacing-10);
}

.legal-section h2 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-4);
  padding-bottom: var(--spacing-2);
  border-bottom: 2px solid var(--color-primary);
  display: inline-block;
}

.legal-section h3 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-800);
  margin: var(--spacing-6) 0 var(--spacing-3);
}

.legal-section p {
  font-size: var(--font-size-base);
  color: var(--color-gray-600);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-4);
}

.legal-section ul {
  margin: var(--spacing-4) 0;
  padding-left: var(--spacing-6);
}

.legal-section li {
  font-size: var(--font-size-base);
  color: var(--color-gray-600);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-2);
  list-style: disc;
}

.legal-section a {
  color: var(--color-primary);
}

.legal-updated {
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
  text-align: center;
  margin-top: var(--spacing-8);
  padding-top: var(--spacing-8);
  border-top: 1px solid var(--color-gray-100);
}

.legal-nav {
  display: flex;
  gap: var(--spacing-4);
  justify-content: center;
  margin-top: var(--spacing-8);
}

.legal-nav a {
  padding: var(--spacing-2) var(--spacing-4);
  background: var(--color-gray-100);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  color: var(--color-gray-700);
  text-decoration: none;
}

.legal-nav a:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

/* ========================================
   Page Header (Inner Pages)
   ======================================== */
.page-header {
  padding: var(--spacing-20) 0 var(--spacing-16);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  text-align: center;
}

.page-header h1 {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-4);
}

.page-header p {
  font-size: var(--font-size-lg);
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto;
}

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

  .hero-content {
    order: 1;
  }

  .hero-visual {
    order: 2;
    margin-top: var(--spacing-8);
  }

  .hero-description {
    margin: 0 auto var(--spacing-8);
  }

  .hero-buttons {
    justify-content: center;
  }

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

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

  .about-image {
    order: 2;
  }

  .about-content {
    order: 1;
  }

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

@media (max-width: 768px) {
  :root {
    --font-size-5xl: 2.25rem;
    --font-size-4xl: 1.875rem;
    --font-size-3xl: 1.5rem;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-white);
    flex-direction: column;
    padding: var(--spacing-4);
    gap: var(--spacing-4);
    border-bottom: 1px solid var(--color-gray-100);
    box-shadow: var(--shadow-lg);
  }

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

  .menu-toggle {
    display: flex;
  }

  .hero {
    padding: 100px 0 60px;
    min-height: auto;
  }

  .hero-phone {
    width: 240px;
    height: 480px;
  }

  .hero-phone-badge {
    display: none;
  }

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

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

  .stat-value {
    font-size: var(--font-size-2xl);
  }

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

  .footer-brand {
    max-width: 100%;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .download-buttons {
    flex-direction: column;
    align-items: center;
  }

  .download-btn {
    width: 100%;
    max-width: 300px;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-4);
  }

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

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

  .stats-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-4);
  }
}

/* ========================================
   Utility Classes
   ======================================== */
.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;
}

.hidden {
  display: none !important;
}

.visible {
  display: block !important;
}

/* Loading Spinner */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: var(--color-white);
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: var(--spacing-8);
  right: var(--spacing-8);
  width: 48px;
  height: 48px;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-base);
  cursor: pointer;
  border: none;
  z-index: var(--z-sticky);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--color-primary-dark);
  transform: translateY(-4px);
}

/* Smooth Scroll */
html {
  scroll-behavior: smooth;
}

/* Print Styles */
@media print {
  .header,
  .footer,
  .back-to-top {
    display: none !important;
  }

  .legal-content {
    padding: 0;
  }
}