*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --primary: #4F46E5;
    --primary-hover: #4338CA;
    --bg: #F8FAFC;
    --surface: #FFFFFF;
    --sidebar-bg: #1E1B4B;
    --sidebar-text: #C7D2FE;
    --sidebar-active: #4F46E5;
    --text: #1E293B;
    --text-muted: #64748B;
    --border: #E2E8F0;
    --danger: #EF4444;
    --success: #22C55E;
    --warning: #F59E0B;
    --radius: 12px;
}

body { font-family: 'Segoe UI', system-ui, sans-serif; background: var(--bg); color: var(--text); }

/* Auth page */
.auth-page { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: linear-gradient(135deg, #1E1B4B 0%, #312E81 100%); }
.auth-container { background: var(--surface); border-radius: var(--radius); padding: 48px; width: 100%; max-width: 420px; box-shadow: 0 20px 60px rgba(0,0,0,0.3); }
.auth-logo { text-align: center; margin-bottom: 32px; }
.auth-logo h1 { font-size: 2.5rem; color: var(--primary); font-weight: 800; letter-spacing: -1px; }
.auth-logo p { color: var(--text-muted); margin-top: 4px; }
.auth-form h2 { font-size: 1.4rem; margin-bottom: 20px; }
.auth-form input { width: 100%; padding: 12px 16px; border: 1px solid var(--border); border-radius: 8px; font-size: 1rem; margin-bottom: 12px; outline: none; transition: border-color 0.2s; }
.auth-form input:focus { border-color: var(--primary); }
.auth-switch { margin-top: 16px; text-align: center; color: var(--text-muted); font-size: 0.9rem; }
.auth-switch a { color: var(--primary); text-decoration: none; }

/* Admin layout */
.admin-layout { display: flex; min-height: 100vh; }
.sidebar { width: 240px; background: var(--sidebar-bg); color: var(--sidebar-text); padding: 24px 0; display: flex; flex-direction: column; flex-shrink: 0; }
.sidebar-logo { padding: 0 24px 24px; font-size: 1.5rem; font-weight: 800; color: white; letter-spacing: -0.5px; }
.sidebar-nav a { display: flex; align-items: center; gap: 10px; padding: 12px 24px; color: var(--sidebar-text); text-decoration: none; font-size: 0.95rem; border-left: 3px solid transparent; transition: all 0.2s; }
.sidebar-nav a:hover, .sidebar-nav a.active { background: rgba(255,255,255,0.08); color: white; border-left-color: var(--primary); }
.sidebar-bottom { margin-top: auto; padding: 24px; }

.main-content { flex: 1; padding: 32px; overflow-y: auto; }
.page-header { margin-bottom: 32px; }
.page-header h1 { font-size: 1.8rem; font-weight: 700; }
.page-header p { color: var(--text-muted); margin-top: 4px; }

/* Cards */
.cards-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 20px; margin-bottom: 32px; }
.card { background: var(--surface); border-radius: var(--radius); padding: 24px; border: 1px solid var(--border); }
.card-label { font-size: 0.85rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; }
.card-value { font-size: 2rem; font-weight: 700; margin-top: 8px; }
.card-sub { font-size: 0.85rem; color: var(--text-muted); margin-top: 4px; }

/* Buttons */
.btn-primary { width: 100%; padding: 12px; background: var(--primary); color: white; border: none; border-radius: 8px; font-size: 1rem; font-weight: 600; cursor: pointer; transition: background 0.2s; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-secondary { padding: 10px 20px; background: transparent; color: var(--primary); border: 1px solid var(--primary); border-radius: 8px; font-size: 0.95rem; cursor: pointer; transition: all 0.2s; }
.btn-secondary:hover { background: var(--primary); color: white; }
.btn-danger { padding: 8px 16px; background: transparent; color: var(--danger); border: 1px solid var(--danger); border-radius: 8px; font-size: 0.9rem; cursor: pointer; }

/* Forms */
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 0.9rem; font-weight: 600; margin-bottom: 6px; }
.form-group input, .form-group textarea, .form-group select { width: 100%; padding: 10px 14px; border: 1px solid var(--border); border-radius: 8px; font-size: 0.95rem; outline: none; }
.form-group input:focus, .form-group textarea:focus { border-color: var(--primary); }
.form-group textarea { min-height: 100px; resize: vertical; }

/* Table */
.data-table { width: 100%; border-collapse: collapse; background: var(--surface); border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); }
.data-table th, .data-table td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--border); font-size: 0.9rem; }
.data-table th { background: var(--bg); font-weight: 600; color: var(--text-muted); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.5px; }
.data-table tr:last-child td { border-bottom: none; }

/* Progress bar */
.progress-bar { background: var(--border); border-radius: 999px; height: 8px; overflow: hidden; margin-top: 8px; }
.progress-fill { height: 100%; background: var(--primary); border-radius: 999px; transition: width 0.3s; }

/* Misc */
.error-msg { background: #FEF2F2; color: var(--danger); border: 1px solid #FECACA; border-radius: 8px; padding: 10px 14px; margin-bottom: 16px; font-size: 0.9rem; }
.section { background: var(--surface); border-radius: var(--radius); padding: 24px; border: 1px solid var(--border); margin-bottom: 24px; }
.section-title { font-size: 1.1rem; font-weight: 600; margin-bottom: 16px; }

/* Drop zone */
.drop-zone { border: 2px dashed var(--border); border-radius: var(--radius); padding: 40px; text-align: center; cursor: pointer; transition: all 0.2s; color: var(--text-muted); }
.drop-zone:hover, .drop-zone.drag-over { border-color: var(--primary); color: var(--primary); background: #EEF2FF; }