/* ===== DESIGN SYSTEM ===== */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital,wght@0,400;0,600;1,400&family=Plus+Jakarta+Sans:wght@300;400;500;600;700&display=swap');

/* CSS Custom Properties */
:root {
  /* Colors - Light Mode */
  --color-primary: #01696f;
  --color-primary-light: #4f98a3;
  --color-surface: #f5f2ed;
  --color-surface-elevated: #ffffff;
  --color-text-primary: #1a1a1a;
  --color-text-secondary: #666666;
  --color-text-muted: #999999;
  --color-border: #e0d8d0;
  --color-accent: #d4a574;
  
  /* Typography */
  --font-heading: 'Instrument Serif', serif;
  --font-body: 'Plus Jakarta Sans', sans-serif;
  
  /* Spacing - 4px base scale */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  
  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  /* Shadows - Warm oklch */
  --shadow-sm: 0 1px 2px oklch(0.3 0.02 0.02 / 0.1);
  --shadow-md: 0 4px 6px -1px oklch(0.3 0.02 0.02 / 0.1), 0 2px 4px -1px oklch(0.3 0.02 0.02 / 0.06);
  --shadow-lg: 0 10px 15px -3px oklch(0.3 0.02 0.02 / 0.1), 0 4px 6px -4px oklch(0.3 0.02 0.02 / 0.1);
  --shadow-xl: 0 20px 25px -5px oklch(0.3 0.02 0.02 / 0.1), 0 8px 10px -6px oklch(0.3 0.02 0.02 / 0.1);
  
  /* Fluid Type Scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);
  --text-base: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.625vw, 1.25rem);
  --text-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
  --text-2xl: clamp(1.5rem, 1.3rem + 1vw, 2rem);
  --text-3xl: clamp(2rem, 1.7rem + 1.5vw, 3rem);
  --text-4xl: clamp(2.5rem, 2rem + 2.5vw, 4rem);
  
  /* Z-index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal: 1040;
  --z-popover: 1050;
  --z-tooltip: 1060;
}

/* Dark Mode */
[data-theme="dark"] {
  --color-primary: #4f98a3;
  --color-primary-light: #01696f;
  --color-surface: #1a1a1a;
  --color-surface-elevated: #2d2d2d;
  --color-text-primary: #f5f2ed;
  --color-text-secondary: #d4a574;
  --color-text-muted: #999999;
  --color-border: #404040;
  --color-accent: #d4a574;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-surface);
  transition: background-color 0.3s ease, color 0.3s ease;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* ===== LAYOUT ===== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.section {
  padding: var(--space-3xl) 0;
}

.grid {
  display: grid;
  gap: var(--space-lg);
}

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

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

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

@media (max-width: 768px) {
  .grid-cols-2,
  .grid-cols-3 {
    grid-template-columns: 1fr;
  }
}

/* ===== COMPONENTS ===== */

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background-color: oklch(0.98 0.01 0.02 / 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: all 0.3s ease;
}

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

[data-theme="dark"] .header {
  background-color: oklch(0.1 0.01 0.02 / 0.8);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) 0;
}

.logo {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-primary);
}

.nav {
  display: flex;
  gap: var(--space-lg);
  align-items: center;
}

.nav-link {
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color 0.2s ease;
}

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

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

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
}

.menu-toggle span {
  width: 24px;
  height: 2px;
  background-color: var(--color-text-primary);
  transition: all 0.3s ease;
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

@media (max-width: 768px) {
  .menu-toggle {
    display: flex;
  }
  
  .nav {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background-color: var(--color-surface-elevated);
    flex-direction: column;
    padding: var(--space-lg);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-lg);
  }
  
  .nav.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
}

/* Theme Toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: var(--space-xs) var(--space-sm);
  cursor: pointer;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: all 0.2s ease;
}

.theme-toggle:hover {
  background-color: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

/* Hero Section */
.hero {
  min-height: 80vh;
  display: flex;
  align-items: center;
  padding: var(--space-3xl) 0;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.hero-text h1 {
  font-family: var(--font-heading);
  font-size: var(--text-4xl);
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--space-lg);
  color: var(--color-text-primary);
}

.hero-text h1 em {
  color: var(--color-primary);
  font-style: italic;
}

.hero-text p {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
}

.hero-illustration {
  display: flex;
  justify-content: center;
  align-items: center;
}

.phone-mockup {
  width: 280px;
  height: 560px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  border-radius: var(--radius-xl);
  padding: var(--space-sm);
  box-shadow: var(--shadow-xl);
  position: relative;
  overflow: hidden;
}

.phone-screen {
  width: 100%;
  height: 100%;
  background-color: var(--color-surface-elevated);
  border-radius: calc(var(--radius-xl) - var(--space-sm));
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: var(--space-lg);
}

@media (max-width: 768px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-text h1 {
    font-size: var(--text-3xl);
  }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-primary {
  background-color: var(--color-primary);
  color: white;
}

.btn-primary:hover {
  background-color: var(--color-primary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
  background-color: var(--color-primary);
  color: white;
}

.btn-group {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* Cards */
.card {
  background-color: var(--color-surface-elevated);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
  border: 1px solid var(--color-border);
}

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

/* App Cards */
.app-card {
  display: flex;
  flex-direction: column;
  background-color: var(--color-surface-elevated);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
  border: 1px solid var(--color-border);
}

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

.app-banner {
  height: 120px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.app-icon {
  width: 64px;
  height: 64px;
  background-color: white;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-2xl);
  font-weight: bold;
  color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.app-body {
  padding: var(--space-lg);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.app-name {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: var(--space-sm);
  color: var(--color-text-primary);
}

.app-description {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
  flex: 1;
  line-height: 1.5;
}

.app-tags {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  margin-bottom: var(--space-lg);
}

.app-tag {
  background-color: var(--color-primary);
  color: white;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 500;
}

.app-actions {
  display: flex;
  gap: var(--space-sm);
}

.app-actions .btn {
  flex: 1;
  justify-content: center;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--text-sm);
}

/* Filter Buttons */
.filter-container {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  margin-bottom: var(--space-xl);
  justify-content: center;
}

.filter-btn {
  background-color: var(--color-surface-elevated);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

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

.filter-btn.active {
  background-color: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

/* App Detail Cards */
.app-detail-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-xl);
  background-color: var(--color-surface-elevated);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: all 0.3s ease;
}

.app-detail-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.app-detail-icon {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-3xl);
  font-weight: bold;
  color: white;
  box-shadow: var(--shadow-md);
}

.app-detail-content h3 {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 600;
  margin-bottom: var(--space-sm);
  color: var(--color-text-primary);
}

.app-detail-content p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

.app-detail-meta {
  display: flex;
  gap: var(--space-lg);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

@media (max-width: 768px) {
  .app-detail-card {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .app-detail-icon {
    margin: 0 auto;
  }
}

/* Policy Page Layout */
.policy-layout {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: var(--space-3xl);
}

.policy-sidebar {
  position: sticky;
  top: 100px;
  height: fit-content;
}

.policy-nav {
  background-color: var(--color-surface-elevated);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.policy-nav h3 {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  margin-bottom: var(--space-md);
  color: var(--color-text-primary);
}

.policy-nav-list {
  list-style: none;
}

.policy-nav-item {
  margin-bottom: var(--space-sm);
}

.policy-nav-link {
  display: block;
  padding: var(--space-sm);
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
  font-size: var(--text-sm);
}

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

.policy-nav-link.active {
  background-color: var(--color-primary);
  color: white;
}

.policy-content {
  background-color: var(--color-surface-elevated);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.policy-content h2 {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  margin-bottom: var(--space-lg);
  color: var(--color-text-primary);
}

.policy-content h3 {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  margin: var(--space-xl) 0 var(--space-md);
  color: var(--color-text-primary);
}

.policy-content p,
.policy-content ul {
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.policy-content ul {
  padding-left: var(--space-lg);
}

.policy-content a {
  color: var(--color-primary);
  text-decoration: underline;
}

.policy-content a:hover {
  color: var(--color-primary-light);
}

@media (max-width: 768px) {
  .policy-layout {
    grid-template-columns: 1fr;
  }
  
  .policy-sidebar {
    position: static;
    margin-bottom: var(--space-xl);
  }
}

/* Footer */
.footer {
  background-color: var(--color-surface-elevated);
  border-top: 1px solid var(--color-border);
  padding: var(--space-2xl) 0 var(--space-lg);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-lg);
}

.footer-brand h3 {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  margin-bottom: var(--space-sm);
  color: var(--color-primary);
}

.footer-brand p {
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.footer-nav h4 {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-md);
  color: var(--color-text-primary);
}

.footer-nav-list {
  list-style: none;
}

.footer-nav-item {
  margin-bottom: var(--space-sm);
}

.footer-nav-link {
  color: var(--color-text-secondary);
  transition: color 0.2s ease;
}

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

.footer-bottom {
  text-align: center;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

@media (max-width: 768px) {
  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

/* Utility Classes */
.text-center {
  text-align: center;
}

.mb-lg {
  margin-bottom: var(--space-lg);
}

.mb-xl {
  margin-bottom: var(--space-xl);
}

.hidden {
  display: none;
}

.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;
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 0.6s ease-out;
}

/* Print Styles */
@media print {
  .header,
  .footer,
  .theme-toggle,
  .menu-toggle {
    display: none;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .card {
    box-shadow: none;
    border: 1px solid #ccc;
  }
}