/* =====================================================================
   STYLE.HTML - GIAO DIỆN MATERIAL DESIGN
   Màu chủ đạo: Xanh dương + Trắng | Bo góc | Đổ bóng nhẹ | Dark Mode
   ===================================================================== */

:root {
  --primary: #1976d2;
  --primary-dark: #115293;
  --primary-light: #63a4ff;
  --bg: #f4f6f9;
  --surface: #ffffff;
  --text: #1a1a1a;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --success: #2e7d32;
  --warning: #ed6c02;
  --danger: #d32f2f;
  --radius: 14px;
  --shadow: 0 2px 10px rgba(0,0,0,0.06);
  --shadow-hover: 0 6px 20px rgba(0,0,0,0.12);
  --sidebar-w: 240px;
}

[data-theme="dark"] {
  --bg: #121417;
  --surface: #1e2126;
  --text: #f0f0f0;
  --text-muted: #9aa0a6;
  --border: #2c2f36;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Segoe UI', Roboto, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  transition: background .2s, color .2s;
}

/* ---------- LAYOUT ---------- */
.app-shell { display: flex; min-height: 100vh; }

.sidebar {
  width: var(--sidebar-w);
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 16px 12px;
  position: fixed;
  top: 0; bottom: 0; left: 0;
  z-index: 100;
  transition: transform .25s ease;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.sidebar-logo {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 17px; color: var(--primary);
  padding: 10px 8px 20px;
}

.nav-item {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 14px; margin-bottom: 4px;
  border-radius: var(--radius);
  color: var(--text); text-decoration: none;
  cursor: pointer; font-size: 15px; font-weight: 500;
  transition: background .15s;
}
.nav-item:hover { background: rgba(25,118,210,0.08); }
.nav-item.active { background: var(--primary); color: #fff; }
.nav-item .icon { font-size: 20px; width: 24px; text-align: center; }

.main {
  margin-left: var(--sidebar-w);
  flex: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ---------- TOPBAR ---------- */
.topbar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 12px 20px;
  display: flex; align-items: center; gap: 14px;
  position: sticky; top: 0; z-index: 50;
  box-shadow: var(--shadow);
}

.menu-toggle {
  display: none;
  background: none; border: none; font-size: 22px; cursor: pointer; color: var(--text);
}

.search-box {
  flex: 1; max-width: 480px;
  display: flex; align-items: center; gap: 8px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 8px 16px;
}
.search-box input {
  border: none; background: transparent; outline: none;
  width: 100%; font-size: 14px; color: var(--text);
}

.topbar-actions { margin-left: auto; display: flex; gap: 10px; align-items: center; }

.icon-btn {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 50%; width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; font-size: 18px; color: var(--text);
}
.icon-btn:hover { background: var(--primary); color: #fff; }

.content { padding: 20px; flex: 1; }

/* ---------- CARDS / STATS ---------- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 14px;
  margin-bottom: 20px;
}

.stat-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
  border-left: 5px solid var(--primary);
}
.stat-card .stat-value { font-size: 26px; font-weight: 700; color: var(--primary); }
.stat-card .stat-label { color: var(--text-muted); font-size: 13px; margin-top: 4px; }
.stat-card.warning { border-left-color: var(--warning); }
.stat-card.warning .stat-value { color: var(--warning); }

.quick-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 24px; }

.btn {
  border: none; border-radius: var(--radius);
  padding: 12px 20px; font-size: 14px; font-weight: 600;
  cursor: pointer; display: inline-flex; align-items: center; gap: 8px;
  transition: transform .1s, box-shadow .15s;
}
.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--primary); color: #fff; box-shadow: var(--shadow); }
.btn-primary:hover { background: var(--primary-dark); box-shadow: var(--shadow-hover); }
.btn-outline { background: var(--surface); color: var(--primary); border: 1.5px solid var(--primary); }
.btn-outline:hover { background: rgba(25,118,210,0.08); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-sm { padding: 8px 14px; font-size: 13px; }
.btn-block { width: 100%; justify-content: center; }

/* ---------- CARD / TABLE ---------- */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
  margin-bottom: 18px;
}
.card-title { font-size: 16px; font-weight: 700; margin-bottom: 14px; display: flex; align-items: center; gap: 8px; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); white-space: nowrap; }
th { color: var(--text-muted); font-weight: 600; font-size: 12px; text-transform: uppercase; }
tr:hover td { background: rgba(25,118,210,0.04); }

.avatar {
  width: 38px; height: 38px; border-radius: 50%;
  object-fit: cover; background: var(--primary-light);
}

.badge {
  display: inline-block; padding: 3px 10px; border-radius: 20px;
  font-size: 11px; font-weight: 700;
}
.badge-success { background: rgba(46,125,50,0.12); color: var(--success); }
.badge-warning { background: rgba(237,108,2,0.12); color: var(--warning); }
.badge-danger { background: rgba(211,47,47,0.12); color: var(--danger); }

/* ---------- FORMS ---------- */
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 13px; font-weight: 600; color: var(--text-muted); }
.form-group input, .form-group select, .form-group textarea {
  padding: 11px 14px; border: 1.5px solid var(--border); border-radius: 10px;
  font-size: 14px; background: var(--surface); color: var(--text); outline: none;
  font-family: inherit;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { border-color: var(--primary); }
.form-actions { display: flex; gap: 10px; margin-top: 18px; justify-content: flex-end; }

.upload-box {
  border: 2px dashed var(--border); border-radius: var(--radius);
  padding: 18px; text-align: center; cursor: pointer; color: var(--text-muted);
  font-size: 13px;
}
.upload-box:hover { border-color: var(--primary); color: var(--primary); }
.upload-preview { max-width: 100%; max-height: 120px; border-radius: 8px; margin-top: 8px; }

/* ---------- MODAL ---------- */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.5);
  display: none; align-items: flex-start; justify-content: center;
  z-index: 1000; padding: 20px; overflow-y: auto;
}
.modal-overlay.open { display: flex; }
.modal {
  background: var(--surface); border-radius: var(--radius);
  max-width: 640px; width: 100%; margin-top: 30px;
  box-shadow: var(--shadow-hover);
  animation: modalIn .18s ease;
}
@keyframes modalIn { from { opacity:0; transform: translateY(-10px);} to {opacity:1; transform:none;} }
.modal-header { display: flex; align-items: center; justify-content: space-between; padding: 18px 20px; border-bottom: 1px solid var(--border); }
.modal-header h3 { margin: 0; font-size: 17px; }
.modal-close { background: none; border: none; font-size: 20px; cursor: pointer; color: var(--text-muted); }
.modal-body { padding: 20px; }

/* ---------- MISC ---------- */
.chip-group { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  padding: 8px 14px; border-radius: 20px; border: 1.5px solid var(--border);
  font-size: 13px; cursor: pointer; color: var(--text);
}
.chip.active { background: var(--primary); border-color: var(--primary); color: #fff; }

.empty-state { text-align: center; padding: 40px 20px; color: var(--text-muted); }
.empty-state .icon { font-size: 40px; margin-bottom: 10px; }

.toast {
  position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%);
  background: #333; color: #fff; padding: 12px 22px; border-radius: 10px;
  font-size: 14px; z-index: 2000; opacity: 0; transition: opacity .2s;
  box-shadow: var(--shadow-hover);
}
.toast.show { opacity: 1; }
.toast.error { background: var(--danger); }
.toast.success { background: var(--success); }

.loading-overlay {
  position: fixed; inset: 0; background: rgba(255,255,255,0.6);
  display: none; align-items: center; justify-content: center; z-index: 3000;
}
.loading-overlay.show { display: flex; }
.spinner {
  width: 42px; height: 42px; border-radius: 50%;
  border: 4px solid var(--border); border-top-color: var(--primary);
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.pagination { display: flex; gap: 6px; justify-content: flex-end; margin-top: 12px; }
.pagination button {
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  border-radius: 8px; padding: 6px 12px; cursor: pointer; font-size: 13px;
}
.pagination button.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ---------- IMAGE VIEWER MODAL ---------- */
.image-viewer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}
.image-viewer-item label {
  display: block; font-size: 13px; font-weight: 600; color: var(--text-muted); margin-bottom: 8px;
}
.image-viewer-img {
  width: 100%; max-height: 360px; object-fit: contain;
  border-radius: 10px; border: 1px solid var(--border); background: var(--bg);
  cursor: zoom-in;
}

/* ---------- LOGIN SCREEN ---------- */
.login-screen {
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  padding: 20px;
}
.login-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hover);
  padding: 32px 28px;
  width: 100%; max-width: 380px;
}
.login-error {
  color: var(--danger); font-size: 13px; min-height: 18px; margin-top: 8px;
}

/* ---------- HIỆN/ẨN THEO VAI TRÒ (điều khiển bằng JS thêm class role-viewer/editor/admin vào <body>) ---------- */
body.role-viewer .editor-only,
body.role-viewer .admin-only,
body.role-editor .admin-only {
  display: none !important;
}

/* ---------- RESPONSIVE (Mobile-first thao tác 1 tay) ---------- */
@media (max-width: 860px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); box-shadow: var(--shadow-hover); }
  .main { margin-left: 0; }
  .menu-toggle { display: block; }
  .search-box { max-width: none; }
  .btn { padding: 13px 18px; font-size: 15px; } /* nút to hơn cho ngón tay */
  .content { padding: 12px; }
  th, td { padding: 8px; font-size: 13px; }
}