/* ==========================================================================
   PUA Drive — Premium Warm Minimal design system
   Single source of truth for visual styling across all pages.
   ========================================================================== */

:root {
  /* Surfaces */
  --pd-bg: #FAF6F1;
  --pd-bg-alt: #F3EBDF;
  --pd-surface: #FFFFFF;
  --pd-border: #E7DCCC;
  --pd-border-strong: #D8C6AC;

  /* Text */
  --pd-ink: #2B2420;
  --pd-ink-soft: #7A6E5F;
  --pd-ink-faint: #A69B8A;

  /* Accent — amethyst purple */
  --pd-accent: #6B3FA0;
  --pd-accent-dark: #4E2C77;
  --pd-accent-light: #B08ED1;
  --pd-accent-soft: #EDE3F5;

  /* Secondary accent — gold */
  --pd-gold: #A6802E;
  --pd-gold-dark: #8A6A24;
  --pd-gold-soft: #F1E6CC;

  /* Semantic (warm-shifted) */
  --pd-success: #5F7A45;
  --pd-success-soft: #E7EEDB;
  --pd-warning: #C08A2E;
  --pd-warning-soft: #F5E7CC;
  --pd-danger: #A94A3B;
  --pd-danger-soft: #F5DFD9;
  --pd-info: #7C6A52;
  --pd-info-soft: #EFE7DA;

  /* Sidebar */
  --pd-sidebar-bg: #1F1526;
  --pd-sidebar-ink: #ECE4EE;
  --pd-sidebar-ink-muted: rgba(236, 228, 238, 0.62);
  --pd-sidebar-active-bg: rgba(176, 142, 209, 0.18);

  /* Shape */
  --pd-radius-sm: 8px;
  --pd-radius: 12px;
  --pd-radius-lg: 16px;
  --pd-radius-pill: 999px;

  /* Elevation — kept intentionally minimal */
  --pd-shadow-xs: 0 1px 2px rgba(43, 36, 32, 0.05);
  --pd-shadow-sm: 0 4px 12px rgba(43, 36, 32, 0.07);
  --pd-shadow-md: 0 12px 32px rgba(43, 36, 32, 0.10);

  --pd-font: 'Inter', 'Noto Sans Thai', -apple-system, 'Segoe UI', sans-serif;
  --pd-transition: 160ms ease;
}

/* -------------------------------------------------------------------------
   Base
   ------------------------------------------------------------------------- */

body {
  background: var(--pd-bg);
  color: var(--pd-ink);
  font-family: var(--pd-font);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  color: var(--pd-ink);
}

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

::selection {
  background: var(--pd-accent-soft);
  color: var(--pd-accent-dark);
}

.text-muted { color: var(--pd-ink-soft) !important; }

/* -------------------------------------------------------------------------
   Sidebar
   ------------------------------------------------------------------------- */

.sidebar {
  background: var(--pd-sidebar-bg);
  min-height: 100vh;
  color: var(--pd-sidebar-ink);
}

.sidebar h5 {
  color: var(--pd-sidebar-ink);
  font-weight: 600;
}

.sidebar hr {
  border-color: rgba(239, 230, 216, 0.14);
}

.sidebar .small,
.sidebar strong {
  color: var(--pd-sidebar-ink);
}

.sidebar .fa-user-circle {
  color: var(--pd-accent-light);
}

.sidebar .nav-link {
  color: var(--pd-sidebar-ink-muted);
  padding: 0.65rem 1rem;
  margin: 0.15rem 0;
  border-radius: var(--pd-radius-sm);
  font-size: 0.925rem;
  transition: background var(--pd-transition), color var(--pd-transition);
}

.sidebar .nav-link i {
  width: 1.25em;
  text-align: center;
  margin-right: 0.35rem;
}

.sidebar .nav-link:hover {
  color: var(--pd-sidebar-ink);
  background: rgba(255, 255, 255, 0.06);
}

.sidebar .nav-link.active {
  color: var(--pd-sidebar-ink);
  background: var(--pd-sidebar-active-bg);
  box-shadow: inset 3px 0 0 var(--pd-accent-light);
}

/* -------------------------------------------------------------------------
   Surface panels (cards, headers, toolbars, list sections)
   ------------------------------------------------------------------------- */

.content-header,
.toolbar,
.filter-section,
.stat-card,
.year-section,
.search-box,
.teacher-card,
.form-container,
.login-card,
.card {
  background: var(--pd-surface);
  border: 1px solid var(--pd-border);
  border-radius: var(--pd-radius-lg);
  box-shadow: var(--pd-shadow-xs);
}

.card { border-radius: var(--pd-radius); }
.card-header {
  background: var(--pd-bg-alt);
  border-bottom: 1px solid var(--pd-border);
  font-weight: 600;
}

.content-header,
.toolbar,
.search-box { padding: 1.25rem 1.5rem; }
.filter-section { padding: 1.5rem; background: var(--pd-bg-alt); border-color: var(--pd-border); }
.filter-label { font-weight: 600; color: var(--pd-ink-soft); margin-bottom: 0.5rem; }

.stat-card {
  padding: 1.5rem;
  transition: box-shadow var(--pd-transition), transform var(--pd-transition), border-color var(--pd-transition);
}
.stat-card:hover {
  box-shadow: var(--pd-shadow-sm);
  border-color: var(--pd-border-strong);
  transform: translateY(-2px);
}

.stat-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
}

.year-section,
.teacher-card {
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  transition: box-shadow var(--pd-transition), border-color var(--pd-transition);
}
.teacher-card:hover {
  box-shadow: var(--pd-shadow-sm);
  border-color: var(--pd-border-strong);
}

.month-section {
  background: var(--pd-bg-alt);
  border-radius: var(--pd-radius-sm);
  padding: 1rem;
  margin-bottom: 1rem;
  border-left: 3px solid var(--pd-accent);
}

.teacher-avatar {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--pd-accent-soft);
  color: var(--pd-accent-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 600;
}

.form-container {
  padding: 2rem;
  border-top: 3px solid var(--pd-accent);
  border-radius: var(--pd-radius-lg);
}

/* -------------------------------------------------------------------------
   File / folder / document rows
   ------------------------------------------------------------------------- */

.file-item,
.folder-item,
.document-item {
  border: 1px solid var(--pd-border);
  border-radius: var(--pd-radius);
  padding: 1rem 1.25rem;
  margin-bottom: 0.5rem;
  background: var(--pd-surface);
  transition: box-shadow var(--pd-transition), border-color var(--pd-transition), transform var(--pd-transition);
}

.file-item:hover,
.folder-item:hover,
.document-item:hover {
  box-shadow: var(--pd-shadow-sm);
  border-color: var(--pd-border-strong);
  transform: translateY(-2px);
}

.folder-item {
  background: var(--pd-gold-soft);
  border-color: var(--pd-gold-soft);
  cursor: pointer;
}

.file-icon {
  font-size: 1.75rem;
  margin-right: 1rem;
  color: var(--pd-ink-soft);
}

.folder-item .file-icon,
.fa-folder.file-icon {
  color: var(--pd-gold);
}

.document-title {
  color: var(--pd-ink);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.document-meta {
  color: var(--pd-ink-soft);
  font-size: 0.9rem;
}
.document-meta i { margin-right: 0.5rem; width: 16px; }

.folder-category {
  position: absolute;
  top: -5px;
  left: -5px;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 0.9rem;
  box-shadow: var(--pd-shadow-xs);
}

/* -------------------------------------------------------------------------
   Badges & pills
   ------------------------------------------------------------------------- */

.badge { border-radius: var(--pd-radius-pill); font-weight: 600; letter-spacing: 0.01em; }

.download-count {
  background: var(--pd-accent-soft);
  color: var(--pd-accent-dark);
  padding: 0.3rem 0.75rem;
  border-radius: var(--pd-radius-pill);
  font-size: 0.8rem;
  font-weight: 600;
  margin-left: 0.5rem;
}

.year-badge {
  background: var(--pd-gold-soft);
  color: var(--pd-gold-dark);
  padding: 0.5rem 1rem;
  border-radius: var(--pd-radius-pill);
  font-size: 1.1rem;
  font-weight: 700;
}

.category-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.375rem 0.75rem;
  border-radius: var(--pd-radius-pill);
  font-size: 0.8rem;
  font-weight: 500;
  color: #fff;
  margin-right: 0.5rem;
}

.priority-badge {
  position: absolute;
  top: 10px;
  right: 10px;
  border-radius: var(--pd-radius-pill);
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: #fff;
}
.priority-urgent { background: var(--pd-danger); }
.priority-high { background: var(--pd-warning); }
.priority-normal { background: var(--pd-accent); }
.priority-low { background: var(--pd-ink-faint); }

.stats-bar {
  background: linear-gradient(135deg, var(--pd-accent) 0%, var(--pd-accent-dark) 100%);
  color: #fff;
  padding: 1.25rem 1.5rem;
  border-radius: var(--pd-radius-lg);
  margin-bottom: 1.5rem;
  box-shadow: var(--pd-shadow-sm);
}

.status-badge { padding: 0.25rem 0.75rem; border-radius: var(--pd-radius-pill); font-size: 0.8rem; font-weight: 600; }
.status-online { background: var(--pd-success-soft); color: var(--pd-success); }
.status-offline { background: var(--pd-bg-alt); color: var(--pd-ink-faint); }

/* -------------------------------------------------------------------------
   Buttons — remap Bootstrap semantic colors to the warm palette
   ------------------------------------------------------------------------- */

.btn { border-radius: var(--pd-radius-sm); font-weight: 500; }

.btn-primary {
  background-color: var(--pd-accent);
  border-color: var(--pd-accent);
  color: #fff;
}
.btn-primary:hover, .btn-primary:focus, .btn-primary:active {
  background-color: var(--pd-accent-dark) !important;
  border-color: var(--pd-accent-dark) !important;
}

.btn-secondary {
  background-color: var(--pd-ink-soft);
  border-color: var(--pd-ink-soft);
}
.btn-secondary:hover, .btn-secondary:focus, .btn-secondary:active {
  background-color: var(--pd-ink) !important;
  border-color: var(--pd-ink) !important;
}

.btn-success { background-color: var(--pd-success); border-color: var(--pd-success); }
.btn-success:hover, .btn-success:focus { background-color: #4d6438 !important; border-color: #4d6438 !important; }

.btn-danger { background-color: var(--pd-danger); border-color: var(--pd-danger); }
.btn-danger:hover, .btn-danger:focus { background-color: #863a2d !important; border-color: #863a2d !important; }

.btn-warning { background-color: var(--pd-warning); border-color: var(--pd-warning); color: #fff; }
.btn-warning:hover, .btn-warning:focus { background-color: #9c7024 !important; border-color: #9c7024 !important; color: #fff; }

.btn-outline-primary { color: var(--pd-accent); border-color: var(--pd-accent); }
.btn-outline-primary:hover { background-color: var(--pd-accent); border-color: var(--pd-accent); }

.btn-upload {
  background: var(--pd-accent);
  border: none;
  color: #fff;
  padding: 0.85rem 2rem;
  border-radius: var(--pd-radius-pill);
  font-weight: 600;
  font-size: 1.05rem;
  transition: background var(--pd-transition), box-shadow var(--pd-transition), transform var(--pd-transition);
  box-shadow: var(--pd-shadow-sm);
}
.btn-upload:hover {
  background: var(--pd-accent-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: var(--pd-shadow-md);
}
.btn-upload:disabled { opacity: 0.55; transform: none; box-shadow: none; }

.remove-file {
  background: var(--pd-danger);
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 35px;
  height: 35px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--pd-transition), transform var(--pd-transition);
}
.remove-file:hover { background: #863a2d; transform: scale(1.06); }

/* -------------------------------------------------------------------------
   Utility color remaps
   ------------------------------------------------------------------------- */

.text-primary { color: var(--pd-accent) !important; }
.text-danger { color: var(--pd-danger) !important; }
.text-success { color: var(--pd-success) !important; }
.text-warning { color: var(--pd-warning) !important; }
.text-info { color: var(--pd-info) !important; }
.text-secondary { color: var(--pd-ink-soft) !important; }
.text-dark { color: var(--pd-ink) !important; }

.bg-primary { background-color: var(--pd-accent) !important; }
.bg-secondary { background-color: var(--pd-ink-soft) !important; }
.bg-success { background-color: var(--pd-success) !important; }
.bg-danger { background-color: var(--pd-danger) !important; }
.bg-warning { background-color: var(--pd-warning) !important; }
.bg-info { background-color: var(--pd-info-soft) !important; color: var(--pd-info) !important; }
.bg-light { background-color: var(--pd-bg-alt) !important; }

.alert-danger {
  background-color: var(--pd-danger-soft);
  border-color: var(--pd-danger-soft);
  color: var(--pd-danger);
}
.alert-success {
  background-color: var(--pd-success-soft);
  border-color: var(--pd-success-soft);
  color: var(--pd-success);
}

.breadcrumb { background: transparent; padding: 0; margin: 0; }
.breadcrumb-item a { color: var(--pd-accent); text-decoration: none; }
.breadcrumb-item.active { color: var(--pd-ink-soft); }

/* -------------------------------------------------------------------------
   File toolbar extras (filter chips, search, numbering)
   ------------------------------------------------------------------------- */

.clear-filter {
  background: var(--pd-danger);
  color: #fff;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: var(--pd-radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  transition: background var(--pd-transition), transform var(--pd-transition);
}
.clear-filter:hover { background: #863a2d; transform: translateY(-1px); }

.btn-filter {
  background: var(--pd-accent);
  border: none;
  color: #fff;
  font-weight: 500;
  transition: background var(--pd-transition), transform var(--pd-transition);
}
.btn-filter:hover { background: var(--pd-accent-dark); color: #fff; transform: translateY(-1px); }

.search-input {
  border-radius: var(--pd-radius-pill);
  border: 1px solid var(--pd-border);
}
.search-input:focus {
  border-color: var(--pd-accent);
  box-shadow: 0 0 0 3px var(--pd-accent-soft);
}

.file-number {
  background: var(--pd-accent-soft);
  color: var(--pd-accent-dark);
  width: 35px;
  height: 35px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
}

.file-actions .btn { border-radius: var(--pd-radius-sm); transition: transform var(--pd-transition); }
.file-actions .btn:hover { transform: translateY(-1px); }

/* -------------------------------------------------------------------------
   Forms
   ------------------------------------------------------------------------- */

.form-control, .form-select {
  border-radius: var(--pd-radius-sm);
  border: 1px solid var(--pd-border);
  background-color: var(--pd-surface);
}
.form-control:focus, .form-select:focus {
  border-color: var(--pd-accent);
  box-shadow: 0 0 0 3px var(--pd-accent-soft);
}
.form-label { font-weight: 500; color: var(--pd-ink-soft); }
.input-group-text { background: var(--pd-bg-alt); border: 1px solid var(--pd-border); color: var(--pd-ink-soft); }

.form-section {
  background: var(--pd-bg-alt);
  border-radius: var(--pd-radius);
  padding: 1.5rem;
  margin-bottom: 2rem;
  border-left: 3px solid var(--pd-accent);
}
.section-title { color: var(--pd-ink); font-weight: 600; margin-bottom: 1rem; display: flex; align-items: center; }
.section-title i { margin-right: 0.5rem; color: var(--pd-accent); }

.required-field { border-left: 3px solid var(--pd-danger); background: var(--pd-danger-soft); }
.char-counter { font-size: 0.875rem; color: var(--pd-ink-soft); text-align: right; }

/* -------------------------------------------------------------------------
   Upload
   ------------------------------------------------------------------------- */

.upload-area {
  border: 2px dashed var(--pd-border-strong);
  border-radius: var(--pd-radius);
  padding: 3rem;
  text-align: center;
  background: var(--pd-bg-alt);
  transition: border-color var(--pd-transition), background var(--pd-transition);
  cursor: pointer;
}
.upload-area:hover, .upload-area.dragover {
  border-color: var(--pd-accent);
  background: var(--pd-accent-soft);
}
.upload-icon { font-size: 3.5rem; color: var(--pd-accent); margin-bottom: 1rem; transition: transform var(--pd-transition); }
.upload-area:hover .upload-icon { transform: scale(1.05); }

.file-list { max-height: 360px; overflow-y: auto; border-radius: var(--pd-radius); background: var(--pd-bg-alt); padding: 1rem; }
.file-preview { display: flex; align-items: center; }

.progress { height: 8px; border-radius: 4px; overflow: hidden; background: var(--pd-bg-alt); }
.progress-bar { background: var(--pd-accent); }

/* -------------------------------------------------------------------------
   Login
   ------------------------------------------------------------------------- */

body:has(.login-card) {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}
.login-card { padding: 2.5rem; min-width: 400px; border-radius: var(--pd-radius-lg); box-shadow: var(--pd-shadow-md); }
.login-header { text-align: center; margin-bottom: 2rem; }
.login-header i { font-size: 2.75rem; color: var(--pd-accent); margin-bottom: 1rem; }

/* -------------------------------------------------------------------------
   Tables
   ------------------------------------------------------------------------- */

.table thead th {
  background: var(--pd-bg-alt);
  color: var(--pd-ink-soft);
  text-transform: uppercase;
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  font-weight: 600;
  border-bottom: 1px solid var(--pd-border);
}
.table td { vertical-align: middle; border-color: var(--pd-border); }
.table-hover tbody tr:hover { background: var(--pd-bg-alt); }

/* -------------------------------------------------------------------------
   Scrollbars — subtle warm styling
   ------------------------------------------------------------------------- */

.file-list::-webkit-scrollbar { width: 8px; }
.file-list::-webkit-scrollbar-track { background: transparent; }
.file-list::-webkit-scrollbar-thumb { background: var(--pd-border-strong); border-radius: var(--pd-radius-pill); }