/* ==========================================================================
   Drive Portal — Style System
   Inspired by Google Drive & Google Workspace
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS Custom Properties / Color Variables
   -------------------------------------------------------------------------- */
:root {
  /* Google Workspace Brand Colors */
  --google-blue: #1a73e8;
  --google-blue-hover: #1557b0;
  --google-blue-surface: #e8f0fe;
  
  --google-green: #1e8e3e;
  --google-green-hover: #137333;
  --google-green-surface: #e6f4ea;
  
  --google-yellow: #f9ab00;
  --google-yellow-dark: #b06000;
  --google-yellow-surface: #fef7e0;
  
  --google-red: #d93025;
  --google-red-surface: #fce8e6;

  /* Light Mode Palette */
  --bg-primary: #f8fafd;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --bg-subtle: #f1f3f4;
  --bg-hover: #f1f3f4;
  
  --border-color: #dadce0;
  --border-subtle: #e8eaed;
  
  --text-primary: #202124;
  --text-secondary: #5f6368;
  --text-tertiary: #80868b;
  --text-inverse: #ffffff;

  /* Card specific accents (Light Mode) */
  --private-accent: #1a73e8;
  --private-bg: #e8f0fe;
  --private-btn: #1a73e8;
  --private-btn-hover: #1557b0;
  --private-btn-text: #ffffff;

  --viewer-accent: #1e8e3e;
  --viewer-bg: #e6f4ea;
  --viewer-btn: #1e8e3e;
  --viewer-btn-hover: #137333;
  --viewer-btn-text: #ffffff;

  --editor-accent: #d97706;
  --editor-bg: #fef3c7;
  --editor-btn: #d97706;
  --editor-btn-hover: #b45309;
  --editor-btn-text: #ffffff;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(60, 64, 67, 0.3), 0 1px 3px 1px rgba(60, 64, 67, 0.15);
  --shadow-md: 0 2px 6px 2px rgba(60, 64, 67, 0.15);
  --shadow-lg: 0 4px 12px 0 rgba(60, 64, 67, 0.15);
  --shadow-hover: 0 4px 16px rgba(32, 33, 36, 0.12), 0 1px 3px rgba(32, 33, 36, 0.08);

  /* Dimensions & Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  --header-height: 68px;
  --max-content-width: 1140px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-theme: background-color 300ms ease, border-color 300ms ease, color 300ms ease, box-shadow 300ms ease;
}

/* --------------------------------------------------------------------------
   2. Dark Mode Overrides
   -------------------------------------------------------------------------- */
[data-theme="dark"] {
  --bg-primary: #121212;
  --bg-surface: #1e1e1e;
  --bg-surface-elevated: #282828;
  --bg-subtle: #2d2e30;
  --bg-hover: #35363a;
  
  --border-color: #3c4043;
  --border-subtle: #303134;
  
  --text-primary: #e8eaed;
  --text-secondary: #9aa0a6;
  --text-tertiary: #80868b;
  --text-inverse: #202124;

  /* Card specific accents (Dark Mode) */
  --private-accent: #8ab4f8;
  --private-bg: rgba(138, 180, 248, 0.12);
  --private-btn: #8ab4f8;
  --private-btn-hover: #aecbfa;
  --private-btn-text: #202124;

  --viewer-accent: #81c995;
  --viewer-bg: rgba(129, 201, 149, 0.12);
  --viewer-btn: #81c995;
  --viewer-btn-hover: #a8dab5;
  --viewer-btn-text: #202124;

  --editor-accent: #fdd663;
  --editor-bg: rgba(253, 214, 99, 0.12);
  --editor-btn: #fdd663;
  --editor-btn-hover: #fee488;
  --editor-btn-text: #202124;

  /* Dark mode shadows */
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 8px 0 rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 6px 16px 0 rgba(0, 0, 0, 0.5);
  --shadow-hover: 0 6px 20px rgba(0, 0, 0, 0.6);
}

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

html {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: var(--transition-theme);
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: var(--transition-theme);
  overflow-x: hidden;
}

/* Accessible focus ring */
:focus-visible {
  outline: 2px solid var(--google-blue);
  outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   4. Header & Navigation
   -------------------------------------------------------------------------- */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  height: var(--header-height);
  transition: var(--transition-theme);
}

.header-container {
  max-width: var(--max-content-width);
  margin: 0 auto;
  height: 100%;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  user-select: none;
}

.brand-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.drive-logo-svg {
  width: 100%;
  height: 100%;
  display: block;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.brand-badge {
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--google-blue);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-top: 2px;
}

[data-theme="dark"] .brand-badge {
  color: var(--private-accent);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Theme Toggle Button */
.btn-icon {
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-secondary);
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.btn-icon:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

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

/* Toggle icon display based on theme */
[data-theme="light"] .sun-icon {
  display: none;
}
[data-theme="light"] .moon-icon {
  display: block;
}
[data-theme="dark"] .sun-icon {
  display: block;
}
[data-theme="dark"] .moon-icon {
  display: none;
}


/* --------------------------------------------------------------------------
   5. Main Content & Hero Section
   -------------------------------------------------------------------------- */
.main-content {
  flex: 1;
  max-width: var(--max-content-width);
  width: 100%;
  margin: 0 auto;
  padding: 40px 24px 64px 24px;
  display: flex;
  flex-direction: column;
  gap: 48px;
}

.hero-section {
  text-align: center;
  max-width: 680px;
  margin: 0 auto;
  animation: fadeInDown 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 20px;
  transition: var(--transition-theme);
}

.hero-tag svg {
  width: 16px;
  height: 16px;
  color: var(--google-blue);
}

[data-theme="dark"] .hero-tag svg {
  color: var(--private-accent);
}

.hero-title {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.hero-description {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.highlight-name {
  color: var(--text-primary);
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   6. Directories Grid & Cards
   -------------------------------------------------------------------------- */
.directories-section {
  animation: fadeInUp 0.7s cubic-bezier(0.16, 1, 0.3, 1) 0.1s backwards;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.drive-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal), var(--transition-theme);
}

.drive-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--border-subtle);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.card-icon-wrapper {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast);
}

.drive-card:hover .card-icon-wrapper {
  transform: scale(1.05);
}

.card-icon-wrapper svg {
  width: 26px;
  height: 26px;
}

/* Card Badge */
.badge-access {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
}

/* Private Card Styling */
.card-private .card-icon-wrapper {
  background-color: var(--private-bg);
  color: var(--private-accent);
}
.badge-private {
  background-color: var(--private-bg);
  color: var(--private-accent);
}

/* Viewer Card Styling */
.card-viewer .card-icon-wrapper {
  background-color: var(--viewer-bg);
  color: var(--viewer-accent);
}
.badge-viewer {
  background-color: var(--viewer-bg);
  color: var(--viewer-accent);
}

/* Editor Card Styling */
.card-editor .card-icon-wrapper {
  background-color: var(--editor-bg);
  color: var(--editor-accent);
}
.badge-editor {
  background-color: var(--editor-bg);
  color: var(--editor-accent);
}

/* Card Body */
.card-body {
  flex: 1;
  margin-bottom: 24px;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.card-desc {
  font-size: 0.925rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* Card Buttons */
.card-footer {
  margin-top: auto;
}

.btn-drive {
  width: 100%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 18px;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-drive svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-fast);
}

.btn-drive:hover svg {
  transform: translate(2px, -2px);
}

.btn-drive:active {
  transform: scale(0.98);
}

.btn-primary {
  background-color: var(--private-btn);
  color: var(--private-btn-text);
}
.btn-primary:hover {
  background-color: var(--private-btn-hover);
}

.btn-viewer {
  background-color: var(--viewer-btn);
  color: var(--viewer-btn-text);
}
.btn-viewer:hover {
  background-color: var(--viewer-btn-hover);
}

.btn-editor {
  background-color: var(--editor-btn);
  color: var(--editor-btn-text);
}
.btn-editor:hover {
  background-color: var(--editor-btn-hover);
}

/* --------------------------------------------------------------------------
   7. Contact Section
   -------------------------------------------------------------------------- */
.contact-section {
  animation: fadeInUp 0.7s cubic-bezier(0.16, 1, 0.3, 1) 0.2s backwards;
}

.contact-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-theme);
}

.contact-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background-color: var(--bg-subtle);
  color: var(--google-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: var(--transition-theme);
}

[data-theme="dark"] .contact-icon {
  color: var(--private-accent);
}

.contact-icon svg {
  width: 24px;
  height: 24px;
}

.contact-text {
  flex: 1;
}

.contact-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.contact-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.btn-contact {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background-color: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.btn-contact svg {
  width: 16px;
  height: 16px;
  color: var(--google-blue);
}

[data-theme="dark"] .btn-contact svg {
  color: var(--private-accent);
}

.btn-contact:hover {
  background-color: var(--bg-hover);
  border-color: var(--text-secondary);
}

.btn-contact:active {
  transform: scale(0.98);
}

/* --------------------------------------------------------------------------
   8. Footer
   -------------------------------------------------------------------------- */
.app-footer {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 20px 0;
  margin-top: auto;
  transition: var(--transition-theme);
}

.footer-container {
  max-width: var(--max-content-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  gap: 16px;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-copy {
  font-weight: 500;
}

.footer-brand {
  font-weight: 600;
  color: var(--text-primary);
}

.footer-subtitle {
  color: var(--text-tertiary);
}

/* --------------------------------------------------------------------------
   9. Toast Notifications
   -------------------------------------------------------------------------- */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 380px;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  background-color: var(--bg-surface-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: flex-start;
  gap: 12px;
  animation: toastIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.toast.toast-hiding {
  opacity: 0;
  transform: translateY(10px);
}

.toast-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  margin-top: 2px;
}

.toast-warning .toast-icon {
  color: var(--google-yellow-dark);
}

[data-theme="dark"] .toast-warning .toast-icon {
  color: var(--editor-accent);
}

.toast-content {
  flex: 1;
}

.toast-title {
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 2px;
}

.toast-message {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.toast-close {
  background: transparent;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  padding: 0;
  width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-left: 4px;
  transition: color var(--transition-fast);
}

.toast-close:hover {
  color: var(--text-primary);
}

/* --------------------------------------------------------------------------
   10. Animations
   -------------------------------------------------------------------------- */
@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

/* Respect user's motion preference */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* --------------------------------------------------------------------------
   11. Responsive Breakpoints
   -------------------------------------------------------------------------- */

/* Tablet (max-width: 960px) */
@media (max-width: 960px) {
  .cards-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  
  /* Make the 3rd card span full width on 2-col layout */
  .drive-card:last-child {
    grid-column: span 2;
  }
  
  .hero-title {
    font-size: 1.875rem;
  }
}

/* Small Tablet & Mobile (max-width: 680px) */
@media (max-width: 680px) {
  :root {
    --header-height: 60px;
  }

  .header-container {
    padding: 0 16px;
  }

  .brand {
    gap: 10px;
  }

  .brand-logo {
    width: 32px;
    height: 32px;
  }

  .brand-title {
    font-size: 1.05rem;
  }

  .brand-badge {
    font-size: 0.58rem;
    letter-spacing: 0.05em;
  }

  .btn-icon {
    width: 38px;
    height: 38px;
  }

  .main-content {
    padding: 24px 16px 44px 16px;
    gap: 28px;
  }

  /* Hero Section */
  .hero-section {
    padding: 0 4px;
  }

  .hero-tag {
    padding: 5px 12px;
    font-size: 0.75rem;
    margin-bottom: 14px;
  }

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

  .hero-title {
    font-size: 1.55rem;
    letter-spacing: -0.015em;
    margin-bottom: 12px;
    line-height: 1.3;
  }

  .hero-description {
    font-size: 0.925rem;
    line-height: 1.55;
  }

  /* Cards Grid */
  .cards-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .drive-card:last-child {
    grid-column: span 1;
  }

  .drive-card {
    padding: 20px 18px;
    border-radius: var(--radius-md);
  }

  .card-header {
    margin-bottom: 14px;
  }

  .card-icon-wrapper {
    width: 44px;
    height: 44px;
    border-radius: 10px;
  }

  .card-icon-wrapper svg {
    width: 22px;
    height: 22px;
  }

  .badge-access {
    font-size: 0.65rem;
    padding: 3px 8px;
  }

  .card-body {
    margin-bottom: 18px;
  }

  .card-title {
    font-size: 1.15rem;
    margin-bottom: 6px;
  }

  .card-desc {
    font-size: 0.875rem;
    line-height: 1.5;
  }

  .btn-drive {
    min-height: 46px;
    padding: 11px 16px;
    font-size: 0.9rem;
    -webkit-tap-highlight-color: transparent;
  }

  /* Contact Card */
  .contact-card {
    flex-direction: column;
    align-items: stretch;
    padding: 20px 18px;
    gap: 16px;
    border-radius: var(--radius-md);
  }

  .contact-icon {
    width: 42px;
    height: 42px;
    border-radius: 10px;
  }

  .contact-icon svg {
    width: 20px;
    height: 20px;
  }

  .contact-title {
    font-size: 1.05rem;
    line-height: 1.35;
    margin-bottom: 4px;
  }

  .contact-desc {
    font-size: 0.85rem;
    line-height: 1.45;
  }

  .contact-action {
    width: 100%;
  }

  .btn-contact {
    width: 100%;
    min-height: 46px;
    justify-content: center;
    font-size: 0.9rem;
    -webkit-tap-highlight-color: transparent;
  }

  /* Footer */
  .footer-container {
    flex-direction: column;
    text-align: center;
    gap: 6px;
    padding: 0 16px;
  }

  .footer-left {
    justify-content: center;
  }

  /* Toast Notification on Mobile */
  .toast-container {
    left: 14px;
    right: 14px;
    bottom: 14px;
    max-width: none;
  }

  .toast {
    padding: 12px 14px;
  }
}

/* Extra Small Devices (Smartphones under 380px) */
@media (max-width: 380px) {
  .brand-badge {
    display: none;
  }

  .hero-title {
    font-size: 1.35rem;
  }

  .btn-drive,
  .btn-contact {
    font-size: 0.85rem;
  }
}