/* Admin Styles - Theme: #1a543b #c6a357 #FFFFFF */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --primary-green: #1a543b;
    --primary-gold: #c6a357;
    --white: #FFFFFF;
    --text-dark: #1f2937;
    --text-gray: #6b7280;
    --bg-light: #f9fafb;
    --border-color: #e5e7eb;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --shadow: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
}

body {
    font-family: 'Sarabun', Arial, sans-serif;
    background: var(--bg-light);
    color: var(--text-dark);
}

/* Login Screen */
.login-screen {
    display: none;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary-green) 0%, #2d6a4f 100%);
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-screen.active { display: flex; }

.login-box {
    background: var(--white);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    padding: 40px;
    max-width: 450px;
    width: 100%;
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header h1 {
    font-size: 2rem;
    color: var(--primary-green);
    margin-bottom: 10px;
}

.login-header p {
    color: var(--text-gray);
}

.institute-name {
    color: var(--primary-gold);
    font-weight: 600;
}

.login-form input {
    width: 100%;
    padding: 14px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 20px;
}

.btn-login {
    width: 100%;
    padding: 14px;
    background: var(--primary-gold);
    color: var(--white);
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
}

.btn-login:hover { background: #b89347; }

.back-link {
    text-align: center;
    margin-top: 20px;
}

.back-link a {
    color: var(--text-gray);
    text-decoration: none;
}

/* Dashboard */
.admin-dashboard { display: none; }
.admin-dashboard.active { display: block; }

.admin-header {
    background: linear-gradient(135deg, var(--primary-green) 0%, #2d6a4f 100%);
    color: var(--white);
    padding: 25px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.admin-header h1 { font-size: 1.8rem; }

.header-right {
    display: flex;
    gap: 10px;
}

.btn-refresh, .btn-logout {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    color: var(--white);
}

.btn-refresh { background: rgba(255,255,255,0.2); }
.btn-logout { background: var(--danger-color); }

/* Summary Section */
.summary-section {
    padding: 40px;
    background: var(--white);
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.summary-card {
    background: var(--white);
    border-radius: 12px;
    padding: 25px;
    display: flex;
    gap: 20px;
    box-shadow: var(--shadow);
    border: 2px solid;
}

.summary-card.total { border-color: var(--primary-green); }
.summary-card.registered { border-color: var(--primary-gold); }
.summary-card.attending { border-color: var(--success-color); }
.summary-card.not-attending { border-color: var(--warning-color); }
.summary-card.pending { border-color: var(--danger-color); }

.card-icon { font-size: 3rem; }
.card-value { font-size: 2.5rem; font-weight: 700; }
.card-label { color: var(--text-gray); }

/* Course Tabs */
.course-tabs-section {
    padding: 40px;
    background: var(--bg-light);
}

.course-tabs {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.tab-btn {
    padding: 12px 25px;
    background: var(--white);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
}

.tab-btn.active {
    background: var(--primary-green);
    color: var(--white);
    border-color: var(--primary-green);
}

.course-stats {
    background: var(--white);
    padding: 20px;
    border-radius: 12px;
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
}

.stat-value.success { color: var(--success-color); }
.stat-value.warning { color: var(--warning-color); }
.stat-value.danger { color: var(--danger-color); }

/* Action Buttons */
.action-buttons {
    padding: 30px 40px;
    background: var(--white);
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.btn-action {
    padding: 14px 28px;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    color: var(--white);
}

.btn-action.primary { background: var(--primary-green); }
.btn-action.secondary { background: var(--primary-gold); }
.btn-action.success { background: var(--success-color); }

/* Search Filter */
.search-filter-section {
    padding: 30px 40px;
    background: var(--bg-light);
    display: flex;
    gap: 20px;
}

.search-box { flex: 1; }
.search-box input {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
}

.filter-box select {
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
}

/* Table */
.table-section { padding: 40px; background: var(--white); }

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table thead {
    background: var(--primary-green);
    color: var(--white);
}

.data-table th { padding: 16px; text-align: left; }
.data-table td { padding: 14px; border-bottom: 1px solid var(--border-color); }

.status-badge {
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.status-badge.attending {
    background: #d1fae5;
    color: var(--success-color);
}

.status-badge.not-attending {
    background: #fef3c7;
    color: var(--warning-color);
}

.status-badge.pending {
    background: #fee2e2;
    color: var(--danger-color);
}

/* Loading */
.loading-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.7);
    align-items: center;
    justify-content: center;
    flex-direction: column;
    z-index: 9999;
}

.loading-overlay.active { display: flex; }

.spinner {
    width: 60px;
    height: 60px;
    border: 5px solid rgba(255,255,255,0.3);
    border-top-color: var(--primary-gold);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

@media (max-width: 768px) {
    .summary-grid { grid-template-columns: 1fr; }
    .search-filter-section { flex-direction: column; }
}