/* ===================================
   FILELAYO - Design System
   ================================ */

/* === CSS Variables / Tokens === */
:root {
  /* Colors - Premium Dark Theme */
  --color-bg-primary: #0a0a0f;
  --color-bg-secondary: #0f0f18;
  --color-bg-card: rgba(25, 25, 35, 0.7);
  --color-bg-hover: rgba(40, 40, 55, 0.8);

  --color-text-primary: #ffffff;
  --color-text-secondary: #b0b0c0;
  --color-text-muted: #6b7280;

  --color-accent: #6366f1;
  --color-accent-hover: #818cf8;
  --color-accent-glow: rgba(99, 102, 241, 0.4);

  --color-border: rgba(255, 255, 255, 0.1);
  --color-border-light: rgba(255, 255, 255, 0.2);

  /* Scale Badge Colors */
  --scale-s: #10b981;
  --scale-m: #3b82f6;
  --scale-l: #f59e0b;
  --scale-xl: #ef4444;

  /* Category Colors */
  --cat-program: #8b5cf6;
  --cat-document: #06b6d4;
  --cat-presentation: #f97316;
  --cat-spreadsheet: #22c55e;
  --cat-image: #ec4899;
  --cat-video: #ef4444;
  --cat-audio: #a855f7;
  --cat-archive: #64748b;
  --cat-etc: #78716c;

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

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

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

  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px var(--color-accent-glow);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent-hover);
}

/* === Layout === */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

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

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

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

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

.grid-6 {
  grid-template-columns: repeat(6, 1fr);
}

/* === Small Card === */
.card-sm {
  padding: var(--space-md);
}

.card-sm .card-icon {
  font-size: 1.5rem;
  margin-bottom: var(--space-sm);
}

.card-sm .card-title {
  font-size: 0.9rem;
  margin-bottom: 0;
}

@media (max-width: 1200px) {
  .grid-6 {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (max-width: 992px) {

  .grid-4,
  .grid-6 {
    grid-template-columns: repeat(3, 1fr);
  }

  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {

  .grid-6,
  .grid-4,
  .grid-3,
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {

  .grid-4,
  .grid-3,
  .grid-2 {
    grid-template-columns: 1fr;
  }
}

/* === Header === */
.header {
  background: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text-primary);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.logo-icon {
  font-size: 1.75rem;
}

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

.nav-link {
  color: var(--color-text-secondary);
  font-weight: 500;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-text-primary);
  background: var(--color-bg-hover);
}

/* === Hero Section === */
.hero {
  text-align: center;
  padding: var(--space-2xl) 0;
  background: radial-gradient(circle at top center, #1b1b29 0%, var(--color-bg-primary) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.05) 0%, transparent 50%);
  animation: rotate 20s linear infinite;
  pointer-events: none;
}

@keyframes rotate {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: var(--space-md);
  background: linear-gradient(135deg, var(--color-text-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.hero-search {
  max-width: 600px;
  margin: var(--space-xl) auto 0;
}

.hero-search-wrapper {
  display: flex;
  gap: var(--space-sm);
  background: var(--color-bg-secondary);
  padding: var(--space-xs);
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  border: 1px solid var(--color-border);
  backdrop-filter: blur(10px);
}

.hero-search .search-input {
  flex: 1;
  border: none;
  padding: var(--space-md) var(--space-lg);
  font-size: 1.125rem;
  outline: none;
  background: transparent;
  width: 100%;
}

.hero-search .btn {
  padding: 0 var(--space-xl);
  border-radius: var(--radius-md);
  font-weight: 600;
}

/* === Cards === */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: all var(--transition-normal);
  cursor: pointer;
  backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
}

.card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  background: linear-gradient(145deg, var(--color-bg-hover), var(--color-bg-card));
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.6), 0 0 20px rgba(99, 102, 241, 0.15);
}

.card-icon {
  font-size: 2rem;
  margin-bottom: var(--space-md);
}

.card-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

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

/* === Category Cards === */
.category-card {
  position: relative;
  overflow: hidden;
}

.category-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--category-color, var(--color-accent));
}

.category-card[data-category="program"] {
  --category-color: var(--cat-program);
}

.category-card[data-category="document"] {
  --category-color: var(--cat-document);
}

.category-card[data-category="presentation"] {
  --category-color: var(--cat-presentation);
}

.category-card[data-category="spreadsheet"] {
  --category-color: var(--cat-spreadsheet);
}

.category-card[data-category="image"] {
  --category-color: var(--cat-image);
}

.category-card[data-category="video"] {
  --category-color: var(--cat-video);
}

.category-card[data-category="audio"] {
  --category-color: var(--cat-audio);
}

.category-card[data-category="archive"] {
  --category-color: var(--cat-archive);
}

.category-card[data-category="etc"] {
  --category-color: var(--cat-etc);
}

/* === File Card === */
.file-card {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.file-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-md);
}

.file-info {
  flex: 1;
  min-width: 0;
}

.file-name {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-primary);
  word-break: break-all;
  margin-bottom: 0;
  letter-spacing: -0.02em;
}

.file-meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-bottom: 0.7rem;
}

.file-size {
  color: var(--color-text-secondary);
}

/* === Scale Badge === */
.scale-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 38px;
  height: 24px;
  padding: 0 var(--space-xs);
  font-size: 0.8rem;
  font-weight: 800;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  box-shadow: 0 1px 2px rgba(0,0,0,0.1);
  background: transparent;
  border: 1px solid currentColor;
  box-sizing: border-box; /* Ensure border doesn't add to size if not set */
}

/* ... existing scale colors ... */

.scale-badge.scale-s {
  color: var(--scale-s);
  border-color: var(--scale-s);
  background: rgba(16, 185, 129, 0.1);
}

.scale-badge.scale-m {
  color: var(--scale-m);
  border-color: var(--scale-m);
  background: rgba(59, 130, 246, 0.1);
}

.scale-badge.scale-l {
  color: var(--scale-l);
  border-color: var(--scale-l);
  background: rgba(245, 158, 11, 0.1);
}

.scale-badge.scale-xl {
  color: var(--scale-xl);
  border-color: var(--scale-xl);
  background: rgba(239, 68, 68, 0.1);
}

/* === Category Badge === */
.category-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 10px;
  height: 24px;
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.08); 
  color: var(--color-text-secondary);
  border: 1px solid rgba(255, 255, 255, 0.05);
  transition: all var(--transition-fast);
}

.category-badge .badge-icon {
  margin-right: 6px;
  font-size: 1.1em;
  display: inline-block;
  line-height: 1;
  transform: translateY(-0.5px); /* Optical lift for emoji */
}

.category-badge .badge-text {
  display: inline-block;
  line-height: 1;
  transform: translateY(-1px);
}

/* Remove old selector */
/* .category-badge > *:not(:last-child) { margin-right: 4px; } */

.file-card:hover .category-badge {
  background: rgba(255, 255, 255, 0.12);
  color: var(--color-text-primary);
  border-color: rgba(255, 255, 255, 0.1);
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  font-size: 0.875rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.btn-primary:hover {
  background: var(--color-accent-hover);
  box-shadow: var(--shadow-glow);
}

.btn-secondary {
  background: var(--color-bg-hover);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

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

.btn-download {
  background: linear-gradient(135deg, #10b981, #059669);
  color: white;
}

.btn-download:hover {
  box-shadow: 0 0 20px rgba(16, 185, 129, 0.4);
  transform: translateY(-1px);
}

/* === Search Bar (Generic) === */
.search-bar {
  margin-bottom: var(--space-lg);
}

.search-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
  transition: all var(--transition-fast);
}

.search-input-wrapper:focus-within {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.search-icon {
  font-size: 1.125rem;
  margin-right: var(--space-sm);
  opacity: 0.6;
}

.search-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--color-text-primary);
  font-size: 1rem;
  font-family: var(--font-sans);
  outline: none;
}

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

.search-clear {
  background: var(--color-bg-hover);
  border: none;
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  width: 24px;
  height: 24px;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.search-clear:hover {
  background: var(--color-border-light);
  color: var(--color-text-primary);
}

.search-results-count {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-top: var(--space-sm);
  padding-left: var(--space-xs);
}

.highlight {
  background: rgba(99, 102, 241, 0.3);
  padding: 0 2px;
  border-radius: 2px;
}

/* === Filter Bar === */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-xl);
}

.filter-group {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.filter-label {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

.filter-btn {
  padding: var(--space-xs) var(--space-md);
  font-size: 0.8rem;
  font-weight: 600;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  border-color: var(--color-border-light);
  color: var(--color-text-primary);
}

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

/* === Section === */
.section {
  padding: var(--space-2xl) 0;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.section-title::before {
  content: '';
  width: 4px;
  height: 24px;
  background: var(--color-accent);
  border-radius: 2px;
}

/* === File Detail Page === */
.file-detail {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg);
}

.file-detail-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.file-detail-icon {
  align-items: center; /* Vertically align items */
  font-size: 4rem;
  margin-bottom: var(--space-lg);
}

.file-detail-name {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
  word-break: break-all;
}

.file-detail-badges {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.file-detail-info {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.info-row {
  display: flex;
  justify-content: space-between;
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border);
}

.info-row:last-child {
  border-bottom: none;
}

.info-label {
  color: var(--color-text-secondary);
}

.info-value {
  font-weight: 500;
}

.download-section {
  text-align: center;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.related-files {
  margin-top: var(--space-2xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
}

.notice-box {
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-sm);
  padding: var(--space-md);
  margin-top: var(--space-xl);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

/* === Footer === */
.footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding: var(--space-xl) 0;
  margin-top: auto;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer-text {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.footer-links {
  display: flex;
  gap: var(--space-lg);
}

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

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

/* === Utilities === */
.text-center {
  text-align: center;
}

.text-muted {
  color: var(--color-text-muted);
}

.mt-lg {
  margin-top: var(--space-lg);
}

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

/* === Loading State === */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-2xl);
}

.loading::after {
  content: '';
  width: 32px;
  height: 32px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loading-spinner {
  display: inline-block;
  width: 1.25rem;
  height: 1.25rem;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

/* === Empty State === */
.empty-state {
  text-align: center;
  padding: var(--space-2xl);
  color: var(--color-text-muted);
}

.empty-state-icon {
  font-size: 3rem;
  margin-bottom: var(--space-md);
}

/* === Mobile Responsiveness === */
@media (max-width: 768px) {

  /* Global Layout */
  .container {
    padding: 0 var(--space-md);
  }

  /* Header */
  .header {
    position: relative;
    /* Unstick header to save space */
    padding: var(--space-sm) 0;
  }

  .header-content {
    flex-direction: column;
    gap: var(--space-md);
  }

  .nav {
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--space-sm) var(--space-md);
  }

  .nav-link {
    font-size: 0.9rem;
    padding: var(--space-xs) var(--space-sm);
  }

  /* Hero Section */
  .hero {
    padding: var(--space-xl) 0;
  }

  .hero-title {
    font-size: 2rem;
    padding: 0 var(--space-sm);
  }

  .hero-subtitle {
    font-size: 1rem;
    padding: 0 var(--space-sm);
  }

  .hero-search {
    padding: 0 var(--space-md);
    margin-top: var(--space-lg);
  }

  .hero-search-wrapper {
    flex-direction: column;
    background: transparent;
    box-shadow: none;
    border: none;
    gap: var(--space-md);
    padding: 0;
  }

  .hero-search .search-input {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-md);
  }

  .hero-search .btn {
    width: 100%;
    height: 3.5rem;
    /* Standard height for touch */
    justify-content: center;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
  }

  /* Filter Bar */
  .filter-bar {
    padding: var(--space-md);
    margin: 0 var(--space-md) var(--space-xl);
    gap: var(--space-sm);
  }

  .filter-group {
    width: 100%;
    overflow-x: auto;
    padding-bottom: var(--space-xs);
    -webkit-overflow-scrolling: touch;
    white-space: nowrap;
    /* Hide scrollbar */
    -ms-overflow-style: none;
    scrollbar-width: none;
  }

  .filter-group::-webkit-scrollbar {
    display: none;
  }

  /* Footer */
  .footer {
    padding: var(--space-lg) 0;
  }

  .footer-content {
    flex-direction: column;
    text-align: center;
    gap: var(--space-lg);
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-md);
  }

  /* File Detail */
  .file-detail-header {
    margin-bottom: var(--space-xl);
  }

  .file-detail-badges {
    flex-wrap: wrap;
  }

  .info-row {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-xs);
  }
}

@media (max-width: 480px) {
  html {
    font-size: 14px;
    /* Scale down base font size */
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .card-icon {
    font-size: 1.75rem;
  }

  .logo {
    font-size: 1.25rem;
  }

  /* Tweaks for very small screens */
  .grid-2 {
    grid-template-columns: 1fr;
  }
}