/* ==========================================================================
   IT-Tools File Host & Download Repository - CSS Design System
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  /* Dark Theme Palette */
  --bg-primary: #0b0f19;
  --bg-secondary: #151c2c;
  --bg-tertiary: #1e293b;
  --bg-card: rgba(21, 28, 44, 0.75);
  --bg-card-hover: rgba(30, 41, 59, 0.85);
  --bg-glass: rgba(11, 15, 25, 0.8);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --accent-primary: #3b82f6;
  --accent-primary-hover: #2563eb;
  --accent-secondary: #10b981;
  --accent-warning: #f59e0b;
  --accent-danger: #ef4444;
  --accent-purple: #8b5cf6;

  --border-color: rgba(255, 255, 255, 0.08);
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 20px rgba(59, 130, 246, 0.25);

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;

  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-card-hover: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.85);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;

  --border-color: rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 20px rgba(59, 130, 246, 0.15);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Background Ambient Blur */
body::before {
  content: '';
  position: fixed;
  top: -150px;
  left: 30%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.12) 0%, rgba(0,0,0,0) 70%);
  pointer-events: none;
  z-index: -1;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: 4px;
}

/* Header Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 800;
  font-size: 1.3rem;
}

.brand-icon {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-purple));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-size: 1.25rem;
  box-shadow: var(--shadow-glow);
}

.brand-badge {
  font-size: 0.7rem;
  background: rgba(59, 130, 246, 0.15);
  color: var(--accent-primary);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(59, 130, 246, 0.3);
  font-weight: 700;
  text-transform: uppercase;
}

/* Search Bar */
.search-box {
  flex: 1;
  max-width: 500px;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 0.7rem 1rem 0.7rem 2.8rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-family: inherit;
  transition: all 0.2s ease;
}

.search-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

/* Nav Actions */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn-nav {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.6rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s ease;
}

.btn-nav:hover {
  background: var(--bg-tertiary);
  border-color: var(--accent-primary);
}

.btn-upload {
  background: var(--accent-primary);
  color: #fff;
  border: none;
}
.btn-upload:hover {
  background: var(--accent-primary-hover);
}

/* Main Container */
.main-content {
  max-width: 1350px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* Hero Section */
.hero-box {
  background: linear-gradient(135deg, rgba(30, 41, 59, 0.6), rgba(15, 23, 42, 0.8));
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-box::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 300px;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.08));
  pointer-events: none;
}

.hero-title {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 0.6rem;
  background: linear-gradient(135deg, #ffffff 40%, var(--accent-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 650px;
  margin: 0 auto 1.5rem;
}

/* Stats Bar */
.stats-bar {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: rgba(255, 255, 255, 0.04);
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.stat-item strong {
  color: var(--text-primary);
}

/* Category Filter Chips */
.category-chips {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
}

.chip {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.chip:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.chip.active {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.35);
}

/* File Grid & Cards */
.file-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.file-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.25rem;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  backdrop-filter: blur(10px);
}

.file-card:hover {
  transform: translateY(-4px);
  border-color: rgba(59, 130, 246, 0.4);
  box-shadow: var(--shadow-lg), 0 0 15px rgba(59, 130, 246, 0.15);
}

.file-card-header {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.ext-badge {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.8rem;
  text-transform: uppercase;
  color: #fff;
  flex-shrink: 0;
  font-family: var(--font-mono);
  box-shadow: var(--shadow-md);
}

/* Extension specific colors */
.ext-zip, .ext-rar, .ext-7z { background: linear-gradient(135deg, #f59e0b, #d97706); }
.ext-exe, .ext-msi { background: linear-gradient(135deg, #3b82f6, #1d4ed8); }
.ext-iso, .ext-img { background: linear-gradient(135deg, #8b5cf6, #6d28d9); }
.ext-pdf, .ext-doc { background: linear-gradient(135deg, #ef4444, #b91c1c); }
.ext-script, .ext-bat, .ext-ps1, .ext-sh { background: linear-gradient(135deg, #10b981, #047857); }
.ext-default { background: linear-gradient(135deg, #64748b, #334155); }

.file-info {
  flex: 1;
  overflow: hidden;
}

.file-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-category {
  font-size: 0.75rem;
  color: var(--accent-primary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.file-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.file-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px dashed var(--border-color);
  padding-top: 0.75rem;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* Download Button */
.btn-download {
  width: 100%;
  padding: 0.8rem 1.2rem;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-primary-hover));
  color: #ffffff;
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  text-decoration: none;
  transition: all 0.2s ease;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.btn-download:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(59, 130, 246, 0.45);
}

/* Upload / Add File Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(6px);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  visibility: hidden;
  transition: all 0.25s ease;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 550px;
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

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

.modal-title {
  font-size: 1.25rem;
  font-weight: 700;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.9rem;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--accent-primary);
}

/* Empty state */
.empty-box {
  grid-column: 1 / -1;
  text-align: center;
  padding: 4rem 1rem;
  color: var(--text-muted);
}
.empty-box i {
  font-size: 3.5rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

/* Footer */
.footer {
  text-align: center;
  padding: 2rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.85rem;
}

@media (max-width: 768px) {
  .navbar {
    padding: 1rem;
    flex-wrap: wrap;
  }
  .search-box {
    order: 3;
    width: 100%;
    max-width: 100%;
  }
  .main-content {
    padding: 1rem;
  }
}