/* 
  BSDS Materials - Premium Dark Glass Theme
*/

:root {
  --bg-color: #050505;
  --bg-gradient: radial-gradient(circle at 50% -20%, #1a1a2e, #050505 80%);
  
  --card-bg: rgba(255, 255, 255, 0.03);
  --card-hover: rgba(255, 255, 255, 0.06);
  --card-border: rgba(255, 255, 255, 0.08);
  --card-border-hover: rgba(56, 189, 248, 0.4);
  
  --accent: #38bdf8; /* Cyan-ish */
  --accent-glow: rgba(56, 189, 248, 0.2);
  --accent-text: #7dd3fc;
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #475569;
  
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

html {
  height: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--bg-color);
  background-image: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text-primary);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  text-decoration: underline;
  text-shadow: 0 0 8px var(--accent-glow);
}

.app {
  max-width: 1000px;
  margin: 0 auto;
  padding: 24px 20px 40px;
}

/* ===== HERO ===== */
.hero {
  padding: 24px 0 16px;
  text-align: center;
  position: relative;
}

/* Subtle glowing orb behind hero */
.hero::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 300px;
  height: 300px;
  background: var(--accent);
  filter: blur(150px);
  opacity: 0.15;
  z-index: -1;
  pointer-events: none;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  margin: 0 0 16px;
  letter-spacing: -0.03em;
  background: linear-gradient(to right, #f8fafc, #94a3b8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-sub {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto 24px;
}

.badges {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(8px);
}

.badge svg {
  width: 14px;
  height: 14px;
  color: var(--accent);
}

/* ===== SECTION HEADINGS ===== */
.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 40px 0 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.section-title svg {
  color: var(--accent);
  width: 24px;
  height: 24px;
}

/* ===== CARDS (Glassmorphism) ===== */
.glass-panel {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius-lg);
}

/* ===== SUBJECT CARDS ===== */
#subjects-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.subject-block {
  padding: 20px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

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

.subject-block:hover {
  background: var(--card-hover);
  border-color: var(--card-border-hover);
  transform: translateY(-4px);
  box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5), 0 0 20px var(--accent-glow);
}

.subject-block:hover::after {
  opacity: 1;
}

.subject-block h3 {
  margin: 0 0 8px;
  font-size: 1.25rem;
  font-weight: 600;
}

.subject-info {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin: 0 0 20px;
  flex-grow: 1;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent-text);
  border: 1px solid rgba(56, 189, 248, 0.2);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

.btn-primary:hover {
  background: var(--accent);
  color: #000;
  text-decoration: none;
  box-shadow: 0 0 15px var(--accent-glow);
}

.btn-primary svg {
  width: 16px;
  height: 16px;
}

/* ===== INFO GRID ===== */
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}

.info-card {
  padding: 20px;
}

.info-card h3 {
  margin: 0 0 12px;
  font-size: 1.1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 10px;
}

.info-card h3 svg {
  color: var(--accent);
  width: 20px;
  height: 20px;
}

.info-card p, .info-card ul {
  margin: 0 0 12px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}
.info-card p:last-child, .info-card ul:last-child { margin-bottom: 0; }

ul.contact-list {
  list-style: none;
  padding: 0;
}
ul.contact-list strong { color: var(--text-primary); }

/* ===== FOOTER ===== */
footer {
  margin-top: 80px;
  padding-top: 24px;
  border-top: 1px solid var(--card-border);
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ===== STATUS / MESSAGE ===== */
.status-message, .message {
  padding: 16px 20px;
  background: rgba(255,255,255,0.02);
  border: 1px dashed var(--card-border);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 12px;
}

.status-message.error {
  border-color: rgba(239, 68, 68, 0.4);
  color: #fca5a5;
  background: rgba(239, 68, 68, 0.05);
}

/* ===== FOLDER NAV & BREADCRUMBS ===== */
.folder-nav {
  display: flex;
  gap: 20px;
  align-items: center;
  padding: 0 0 16px;
  border-bottom: 1px solid var(--card-border);
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--card-border);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 500;
  transition: var(--transition);
}

.back-btn:hover {
  background: rgba(255,255,255,0.05);
  color: var(--text-primary);
  border-color: rgba(255,255,255,0.2);
}

.back-btn svg { width: 16px; height: 16px; }

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  flex-wrap: wrap;
}

.breadcrumb {
  cursor: pointer;
  color: var(--text-secondary);
  transition: var(--transition);
}

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

.breadcrumb:last-child {
  color: var(--accent-text);
  font-weight: 600;
  pointer-events: none;
}

.breadcrumb-sep {
  color: var(--text-muted);
}
.breadcrumb-sep svg { width: 14px; height: 14px; }

/* ===== SEARCH ===== */
.controls { margin-bottom: 16px; }

.search-wrapper {
  position: relative;
  width: 100%;
}

.search-wrapper svg {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--text-muted);
}

.search {
  width: 100%;
  background: rgba(0,0,0,0.3);
  border: 1px solid var(--card-border);
  padding: 12px 16px 12px 42px;
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: inherit;
  transition: var(--transition);
}

.search::placeholder { color: var(--text-muted); }
.search:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.15);
}

/* ===== FOLDER & FILE LISTS ===== */
.hint {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin: 0 0 12px 8px;
}

.folder-list { list-style: none; padding: 0; margin: 0 0 32px; }

.folder-item, .file-row {
  display: flex;
  align-items: center;
  padding: 8px 12px;
  margin-bottom: 4px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.015);
  border: 1px solid transparent;
  transition: var(--transition);
}

.folder-item:hover, .file-row:hover {
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--card-border);
}

/* Folder specific */
.folder-item .left {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-grow: 1;
}

.folder-icon { color: var(--accent); width: 20px; height: 20px; }
.folder-name { font-weight: 500; cursor: pointer; color: var(--text-primary); }
.folder-name:hover { color: var(--accent-text); text-decoration: underline; }

.expand-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.expand-btn:hover { background: rgba(255,255,255,0.1); color: var(--text-primary); }
.expand-btn svg { width: 16px; height: 16px; transition: transform 0.2s; }
.expand-btn.open svg { transform: rotate(90deg); }

.child-contents {
  border-left: 2px solid var(--card-border);
  padding-left: 24px;
  margin-left: 30px;
  margin-top: 8px;
  margin-bottom: 16px;
}

/* File specific */
.file-row { justify-content: space-between; gap: 16px; }
.file-row .left { display: flex; align-items: center; gap: 12px; min-width: 0; }
.file-row .right { display: flex; gap: 8px; flex-shrink: 0; }

.file-icon { color: var(--text-secondary); width: 20px; height: 20px; }
.file-icon.pdf { color: #ef4444; }
.file-icon.code { color: #3b82f6; }
.file-icon.text { color: #8b5cf6; }

.file-name {
  font-weight: 500;
  cursor: pointer;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.file-name:hover { color: var(--accent-text); text-decoration: underline; }

.file-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
  background: rgba(0,0,0,0.3);
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid var(--card-border);
}

.action-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.05);
  color: var(--text-secondary);
  border: 1px solid transparent;
  transition: var(--transition);
  cursor: pointer;
}
.action-icon-btn:hover {
  background: var(--card-hover);
  color: var(--accent-text);
  border-color: var(--card-border);
}
.action-icon-btn svg { width: 16px; height: 16px; }

/* ===== MODAL ===== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 100;
  opacity: 0;
  transition: opacity 0.3s ease;
}
.modal-backdrop.show { opacity: 1; }

.modal {
  background: var(--bg-color);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 1200px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  transform: scale(0.95) translateY(20px);
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.modal-backdrop.show .modal { transform: scale(1) translateY(0); }

.modal-header {
  padding: 16px 24px;
  border-bottom: 1px solid var(--card-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 10px;
}

.modal-body {
  padding: 0;
  flex: 1;
  overflow: auto;
  background: #0f172a; /* Slightly lighter dark for contrast with code */
  border-bottom-left-radius: var(--radius-lg);
  border-bottom-right-radius: var(--radius-lg);
}

.modal-iframe {
  width: 100%;
  height: 80vh;
  border: 0;
  display: block;
}

pre {
  margin: 0;
  padding: 24px;
  color: #e2e8f0;
  font-family: 'Fira Code', monospace;
  font-size: 0.875rem;
  overflow-x: auto;
}

/* ===== ANIMATIONS ===== */
.fade-enter {
  animation: fadeIn 0.3s ease forwards;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .hero h1 { font-size: 2.2rem; }
  .file-row { flex-direction: column; align-items: flex-start; }
  .file-row .right { width: 100%; justify-content: flex-end; padding-top: 8px; border-top: 1px solid rgba(255,255,255,0.05); }
  .action-icon-btn { flex: 1; }
}

/* Scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg-color); }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.2); }