/* ============================================
   FRP Tools Hub — Design System & Styles
   ============================================ */

/* === Google Fonts === */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

/* === Design Tokens === */
:root {
  /* Colors */
  --color-bg: #0a0f1e;
  --color-bg-secondary: #0f172a;
  --color-surface: #1e293b;
  --color-surface-hover: #334155;
  --color-surface-active: #3b4a63;
  --color-accent: #3b82f6;
  --color-accent-hover: #2563eb;
  --color-accent-glow: rgba(59, 130, 246, 0.25);
  --color-text: #f8fafc;
  --color-text-secondary: #cbd5e1;
  --color-text-muted: #94a3b8;
  --color-text-dim: #64748b;
  --color-border: #1e293b;
  --color-border-accent: rgba(59, 130, 246, 0.3);
  --color-success: #22c55e;
  --color-success-bg: rgba(34, 197, 94, 0.15);
  --color-error: #ef4444;
  --color-error-bg: rgba(239, 68, 68, 0.15);
  --color-warning: #f59e0b;
  --color-warning-bg: rgba(245, 158, 11, 0.15);
  --color-info: #3b82f6;
  --color-info-bg: rgba(59, 130, 246, 0.15);
  --color-download: #8b5cf6;
  --color-download-hover: #7c3aed;

  /* Typography */
  --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.65;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 2.5rem;
  --spacing-3xl: 3rem;
  --spacing-4xl: 4rem;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 20px var(--color-accent-glow);
  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.2);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms ease;

  /* Z-index */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-toast: 500;
}

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

/* === Accessibility: Reduced Motion === */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* === Base === */
html {
  scroll-behavior: smooth;
}

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

/* === Focus Styles (a11y) === */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

a {
  color: inherit;
  text-decoration: none;
}

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

/* === Layout === */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-3xl) var(--spacing-xl);
}

/* === Header === */
.header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
  padding-bottom: var(--spacing-2xl);
  position: relative;
}

.header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 120px;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  border-radius: var(--radius-full);
}

.header__title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-extrabold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-sm);
  background: linear-gradient(135deg, var(--color-text) 0%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header__subtitle {
  color: var(--color-text-muted);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-normal);
}

/* === Search & Filter Bar === */
.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-2xl);
  align-items: center;
}

.search-wrapper {
  position: relative;
  flex: 1;
  min-width: 250px;
}

.search-wrapper__icon {
  position: absolute;
  left: var(--spacing-md);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-dim);
  font-size: var(--font-size-lg);
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) var(--spacing-3xl);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  font-family: var(--font-family-primary);
  font-size: var(--font-size-md);
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.search-input::placeholder {
  color: var(--color-text-dim);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: var(--shadow-glow);
}

.search-count {
  color: var(--color-text-dim);
  font-size: var(--font-size-sm);
  white-space: nowrap;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-surface);
  border-radius: var(--radius-md);
}

/* === Category Filters === */
.category-filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xl);
}

.category-btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  font-family: var(--font-family-primary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-normal);
  white-space: nowrap;
}

.category-btn:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
  border-color: var(--color-text-dim);
}

.category-btn.active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-text);
  box-shadow: var(--shadow-glow);
}

/* === Section === */
.section {
  margin-bottom: var(--spacing-4xl);
}

.section__title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 2px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.section__title-icon {
  font-size: var(--font-size-2xl);
}

.section__title-accent {
  width: 50px;
  height: 3px;
  background: var(--color-accent);
  border-radius: var(--radius-full);
  display: inline-block;
  margin-left: var(--spacing-sm);
}

/* === Grid === */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-md);
}

/* === Card (Open Tools) === */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md) var(--spacing-lg);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent), transparent);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.card:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-border-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.card:hover::before {
  opacity: 1;
}

.card__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  width: 100%;
  padding: var(--spacing-xs) 0;
}

.card__info {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  min-width: 0;
  flex: 1;
}

.card__icon {
  width: 28px;
  height: 28px;
  object-fit: contain;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.card__icon--round {
  border-radius: 50%;
}

.card__name {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* === Badge === */
.badge {
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  flex-shrink: 0;
}

.badge--open {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover));
  color: var(--color-text);
}

.badge--download {
  background: linear-gradient(135deg, var(--color-download), var(--color-download-hover));
  color: var(--color-text);
}

.badge--xml {
  background: linear-gradient(135deg, var(--color-warning), #d97706);
  color: #1a1a1a;
}

/* === APK Card === */
.card--apk .card__link {
  justify-content: space-between;
}

.card--apk .card__icon {
  width: 24px;
  height: 24px;
}

/* === Empty State === */
.empty-state {
  text-align: center;
  padding: var(--spacing-4xl) var(--spacing-xl);
  display: none;
}

.empty-state.visible {
  display: block;
}

.empty-state__icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  opacity: 0.5;
}

.empty-state__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.empty-state__text {
  color: var(--color-text-dim);
  font-size: var(--font-size-sm);
}

/* === Toast Notifications === */
.toast-container {
  position: fixed;
  top: var(--spacing-xl);
  right: var(--spacing-xl);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.toast {
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  animation: toast-in var(--transition-slow) ease forwards;
  min-width: 250px;
  max-width: 400px;
}

.toast--info {
  background: var(--color-info-bg);
  border: 1px solid var(--color-info);
  color: var(--color-text);
}

.toast--success {
  background: var(--color-success-bg);
  border: 1px solid var(--color-success);
  color: var(--color-text);
}

.toast--error {
  background: var(--color-error-bg);
  border: 1px solid var(--color-error);
  color: var(--color-text);
}

.toast--removing {
  animation: toast-out var(--transition-normal) ease forwards;
}

.toast__close {
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  margin-left: auto;
  padding: var(--spacing-xs);
  font-size: var(--font-size-lg);
  line-height: 1;
}

.toast__close:hover {
  color: var(--color-text);
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes toast-out {
  from {
    opacity: 1;
    transform: translateX(0);
  }
  to {
    opacity: 0;
    transform: translateX(100%);
  }
}

/* === Footer === */
.footer {
  text-align: center;
  color: var(--color-text-dim);
  padding: var(--spacing-2xl) 0;
  margin-top: var(--spacing-2xl);
  border-top: 1px solid var(--color-border);
  font-size: var(--font-size-sm);
}

/* === Card Hidden (for search/filter) === */
.card.hidden {
  display: none;
}

/* === Responsive: Tablet === */
@media (max-width: 768px) {
  .container {
    padding: var(--spacing-xl) var(--spacing-md);
  }

  .header__title {
    font-size: var(--font-size-3xl);
  }

  .header__subtitle {
    font-size: var(--font-size-md);
  }

  .grid {
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: var(--spacing-sm);
  }

  .toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .search-wrapper {
    min-width: unset;
  }

  .section__title {
    font-size: var(--font-size-xl);
  }

  .toast-container {
    left: var(--spacing-md);
    right: var(--spacing-md);
  }

  .toast {
    min-width: unset;
    max-width: unset;
  }
}

/* === Responsive: Mobile === */
@media (max-width: 480px) {
  .container {
    padding: var(--spacing-lg) var(--spacing-md);
  }

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

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

  .category-filters {
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: var(--spacing-sm);
  }

  .category-filters::-webkit-scrollbar {
    display: none;
  }
}