:root {
    --bg-main: #0f172a;
    --bg-sidebar: #111827;
    --bg-card: #1e293b;
    --bg-hover: #1f2937;
    --bg-active-tab: #1e293b;
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --text-main: #ffffff;
    --text-muted: #9ca3af;
    --border-color: #334155;
    --sidebar-width: 260px;
    --header-height: 60px;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Inter', sans-serif; }
body { background-color: var(--bg-main); color: var(--text-main); height: 100vh; overflow: hidden; }
.app-container { display: flex; height: 100vh; }
.mt-4 { margin-top: 16px; }

/* Sidebar */
.sidebar { width: var(--sidebar-width); background-color: var(--bg-sidebar); border-right: 1px solid var(--border-color); display: flex; flex-direction: column; z-index: 10; }
.sidebar-header { height: var(--header-height); display: flex; align-items: center; padding: 0 20px; border-bottom: 1px solid var(--border-color); gap: 12px; flex-shrink: 0;}
.logo-box { width: 32px; height: 32px; background-color: var(--primary); border-radius: 6px; display: flex; align-items: center; justify-content: center; font-weight: bold; }
.logo-text { font-weight: 600; font-size: 16px; }

.sidebar-search { padding: 16px 12px 0; }
.search-trigger { width: 100%; display: flex; align-items: center; gap: 8px; background-color: var(--bg-main); border: 1px solid var(--border-color); color: var(--text-muted); padding: 8px 12px; border-radius: 6px; cursor: pointer; font-size: 13px; transition: all 0.2s; }
.search-trigger:hover { border-color: var(--primary); color: var(--text-main); }
.search-trigger kbd { margin-left: auto; background-color: var(--bg-card); padding: 2px 6px; border-radius: 4px; font-size: 10px; font-weight: 600; }

.sidebar-nav { flex: 1; padding: 16px 12px; overflow-y: auto; }
.sidebar-nav::-webkit-scrollbar { width: 4px; }
.sidebar-nav::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 4px; }

.nav-section { font-size: 11px; color: var(--text-muted); font-weight: 600; margin-bottom: 8px; padding-left: 12px; letter-spacing: 1px; }
.nav-item { width: 100%; display: flex; align-items: center; gap: 12px; background: transparent; border: none; color: var(--text-muted); padding: 10px 12px; border-radius: 6px; cursor: pointer; font-size: 14px; text-align: left; transition: all 0.2s; margin-bottom: 2px; }
.nav-item i { font-size: 18px; }
.nav-item:hover { background-color: var(--bg-hover); color: var(--text-main); }
.nav-item.active { background-color: rgba(99, 102, 241, 0.1); color: var(--primary); font-weight: 500;}

/* History List */
.history-item { font-size: 13px; color: var(--text-muted); padding: 8px 12px; cursor: pointer; border-radius: 6px; display: flex; align-items: center; gap: 8px; }
.history-item:hover { background-color: var(--bg-hover); color: var(--text-main); }
.history-item i { font-size: 14px; opacity: 0.7; }

/* Main Content */
.main-content { flex: 1; display: flex; flex-direction: column; overflow: hidden; position: relative; }
.topbar { height: var(--header-height); background-color: var(--bg-main); border-bottom: 1px solid var(--border-color); display: flex; align-items: center; justify-content: space-between; padding: 0 24px; flex-shrink: 0; }
.school-info { display: flex; flex-direction: column; }
.school-name { font-weight: 600; font-size: 15px; }
.school-term { font-size: 12px; color: var(--text-muted); }

.topbar-right { display: flex; align-items: center; gap: 16px; }
.icon-btn { background: transparent; border: none; color: var(--text-muted); font-size: 20px; cursor: pointer; transition: color 0.2s; display: flex; align-items: center; justify-content: center; width: 32px; height: 32px; border-radius: 6px;}
.icon-btn:hover { background-color: var(--bg-hover); color: var(--text-main); }
.icon-btn.is-fav { color: #eab308; }

.user-profile { display: flex; align-items: center; gap: 10px; border-left: 1px solid var(--border-color); padding-left: 16px; }
.avatar { width: 32px; height: 32px; background-color: var(--primary); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 14px; font-weight: bold; }
.user-details { display: flex; flex-direction: column; }
.user-name { font-size: 13px; font-weight: 500; }
.user-role { font-size: 11px; color: var(--text-muted); }

/* Tabs */
.tabs-container { display: flex; background-color: var(--bg-main); border-bottom: 1px solid var(--border-color); padding: 8px 16px 0; gap: 6px; overflow-x: auto; flex-shrink: 0; }
.tabs-container::-webkit-scrollbar { height: 4px; }
.tabs-container::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 4px; }
.tab { display: flex; align-items: center; gap: 8px; padding: 8px 16px; background-color: transparent; color: var(--text-muted); border: 1px solid transparent; border-bottom: none; border-radius: 6px 6px 0 0; cursor: pointer; font-size: 13px; font-weight: 500; transition: background-color 0.2s; white-space: nowrap; }
.tab:hover { background-color: var(--bg-hover); color: var(--text-main); }
.tab.active { background-color: var(--bg-active-tab); color: var(--text-main); border-color: var(--border-color); }
.tab-actions { display: flex; align-items: center; gap: 4px; margin-left: 4px; }
.tab-btn { font-size: 14px; border-radius: 4px; padding: 2px; transition: all 0.2s; color: var(--text-muted); }
.tab-btn:hover { background-color: rgba(255,255,255,0.1); color: var(--text-main); }
.tab-btn.close:hover { background-color: rgba(239, 68, 68, 0.2); color: #ef4444; }

/* Loader & Iframes */
.loading-overlay { position: absolute; top: calc(var(--header-height) + 45px); left: 0; right: 0; bottom: 0; background-color: var(--bg-main); display: none; flex-direction: column; align-items: center; justify-content: center; z-index: 50; gap: 16px; }
.loading-overlay.active { display: flex; }
.spinner { width: 40px; height: 40px; border: 3px solid rgba(99, 102, 241, 0.3); border-radius: 50%; border-top-color: var(--primary); animation: spin 1s ease-in-out infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.module-area { flex: 1; position: relative; background-color: var(--bg-main); }
.module-frame { width: 100%; height: 100%; border: none; display: none; background-color: var(--bg-main); animation: fadeIn 0.3s ease; }
.module-frame.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(5px); } to { opacity: 1; transform: translateY(0); } }

/* Dashboard Styles */
#content-dashboard { padding: 32px; overflow-y: auto; }
.dashboard-header { margin-bottom: 32px; }
.dashboard-header h1 { font-size: 24px; font-weight: 600; margin-bottom: 8px; }
.dashboard-header p { color: var(--text-muted); }
.quick-actions { display: flex; gap: 12px; margin-bottom: 32px; flex-wrap: wrap; }
.btn-primary { display: flex; align-items: center; gap: 8px; background-color: var(--bg-card); border: 1px solid var(--border-color); color: var(--text-main); padding: 12px 20px; border-radius: 6px; font-size: 14px; font-weight: 500; cursor: pointer; transition: all 0.2s; }
.btn-primary:hover { background-color: var(--primary); border-color: var(--primary); }
.summary-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.summary-card { background-color: var(--bg-card); border: 1px solid var(--border-color); border-radius: 8px; padding: 24px; display: flex; align-items: center; gap: 16px; cursor: pointer; transition: transform 0.2s; }
.summary-card:hover { transform: translateY(-2px); border-color: var(--primary); }
.card-icon { width: 48px; height: 48px; border-radius: 8px; display: flex; align-items: center; justify-content: center; font-size: 24px; }
.card-icon.blue { background-color: rgba(59, 130, 246, 0.1); color: #3b82f6; }
.card-icon.red { background-color: rgba(239, 68, 68, 0.1); color: #ef4444; }
.card-info h3 { font-size: 13px; color: var(--text-muted); margin-bottom: 4px; }
.card-value { font-size: 16px; font-weight: 600; color: var(--text-main); }

/* Search Modal (Spotlight) */
.search-modal { position: fixed; top: 0; left: 0; right: 0; bottom: 0; background-color: rgba(15, 23, 42, 0.8); backdrop-filter: blur(4px); z-index: 9999; display: flex; align-items: flex-start; justify-content: center; padding-top: 10vh; }
.search-modal.hidden { display: none; }
.search-modal-content { width: 100%; max-width: 600px; background-color: var(--bg-card); border: 1px solid var(--border-color); border-radius: 12px; box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5); overflow: hidden; }
.search-input-wrapper { display: flex; align-items: center; padding: 16px 20px; border-bottom: 1px solid var(--border-color); gap: 12px; }
.search-input-wrapper i { font-size: 24px; color: var(--text-muted); }
.search-input-wrapper input { flex: 1; background: transparent; border: none; color: var(--text-main); font-size: 18px; outline: none; }
.search-input-wrapper input::placeholder { color: var(--text-muted); }
.close-search { background: var(--bg-main); border: 1px solid var(--border-color); color: var(--text-muted); padding: 4px 8px; border-radius: 4px; cursor: pointer; font-size: 11px; font-weight: bold; }
.search-results { max-height: 300px; overflow-y: auto; padding: 8px; }
.search-result-item { display: flex; align-items: center; gap: 12px; padding: 12px 16px; cursor: pointer; border-radius: 8px; color: var(--text-muted); transition: all 0.2s; }
.search-result-item:hover { background-color: var(--bg-hover); color: var(--text-main); }
.search-result-item i { font-size: 20px; }
.search-result-item .title { font-weight: 500; font-size: 15px; }