@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #a5b4fc;
    --secondary: #8b5cf6;
    --success: #10b981;
    --success-light: #d1fae5;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    --danger: #ef4444;
    --danger-light: #fee2e2;
    --info: #06b6d4;
    --info-light: #cffafe;
    --pink: #ec4899;
    --orange: #f97316;
    --teal: #14b8a6;
    --light-bg: #f0f2ff;
    --sidebar-bg: linear-gradient(180deg, #1e1b4b 0%, #312e81 50%, #3730a3 100%);
    --sidebar-text: #c7d2fe;
    --card-shadow: 0 4px 20px rgba(99, 102, 241, 0.1);
    --card-hover-shadow: 0 8px 30px rgba(99, 102, 241, 0.2);
}

* { box-sizing: border-box; }

body {
    background-color: var(--light-bg);
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #1e293b;
}

/* ===== LOGIN PAGE ===== */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 30%, #f093fb 60%, #f5576c 100%);
    background-size: 400% 400%;
    animation: gradientShift 12s ease infinite;
    position: relative;
    overflow: hidden;
}

.login-container::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.08) 1px, transparent 1px);
    background-size: 30px 30px;
    animation: float 20s linear infinite;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes float {
    0% { transform: translate(0, 0); }
    100% { transform: translate(30px, 30px); }
}

.login-card {
    width: 100%;
    max-width: 440px;
    border-radius: 20px;
    box-shadow: 0 25px 60px rgba(0,0,0,0.3);
    border: none;
    backdrop-filter: blur(10px);
    background: rgba(255,255,255,0.95);
    position: relative;
    z-index: 1;
    overflow: hidden;
}

.login-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2, #f093fb, #f5576c);
}

.login-card .card-header {
    background: transparent;
    border-bottom: 1px solid #f0f0f0;
    text-align: center;
    padding: 2rem 1.5rem 1.5rem;
}

.login-card .card-header h4 {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
    font-weight: 800;
    font-size: 1.5rem;
}

.login-card .card-header h4 i {
    -webkit-text-fill-color: var(--primary);
}

.login-card .card-header small {
    color: #64748b;
    font-size: 0.85rem;
}

.login-card .card-body {
    padding: 2rem;
}

.login-card .form-control {
    border-radius: 10px;
    padding: 0.65rem 0.9rem;
    border: 2px solid #e2e8f0;
    transition: all 0.3s;
}

.login-card .form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99,102,241,0.15);
}

.login-card .input-group-text {
    border-radius: 10px 0 0 10px;
    background: linear-gradient(135deg, #eef2ff, #e0e7ff);
    border: 2px solid #e2e8f0;
    border-right: none;
    color: var(--primary);
}

.login-card .btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border: none;
    border-radius: 10px;
    padding: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.3px;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(99,102,241,0.3);
}

.login-card .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(99,102,241,0.4);
}

.login-card .form-select {
    border-radius: 10px;
    border: 2px solid #e2e8f0;
}

.login-card a {
    color: var(--primary);
    font-weight: 600;
    text-decoration: none;
}

.login-card a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* ===== SIDEBAR ===== */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 260px;
    height: 100vh;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    z-index: 1000;
    transition: transform 0.3s ease;
    overflow-y: auto;
    box-shadow: 4px 0 25px rgba(30, 27, 75, 0.3);
}

.sidebar .brand {
    padding: 1.5rem;
    text-align: center;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    background: rgba(255,255,255,0.03);
}

.sidebar .brand h5 {
    color: #fff;
    margin: 0;
    font-weight: 800;
    font-size: 1.15rem;
    letter-spacing: 0.5px;
}

.sidebar .brand h5 i {
    background: linear-gradient(135deg, #a78bfa, #f472b6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.3rem;
}

.sidebar .brand small {
    color: rgba(255,255,255,0.4);
    font-size: 0.7rem;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.sidebar .nav-link {
    color: var(--sidebar-text);
    padding: 0.75rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.9rem;
    font-weight: 500;
    border-left: 4px solid transparent;
    transition: all 0.25s ease;
    margin: 2px 0;
}

.sidebar .nav-link:hover {
    color: #fff;
    background: rgba(255,255,255,0.08);
    border-left-color: var(--primary-light);
}

.sidebar .nav-link.active {
    color: #fff;
    background: linear-gradient(90deg, rgba(99,102,241,0.3), transparent);
    border-left-color: #a78bfa;
    font-weight: 600;
}

.sidebar .nav-link i {
    width: 22px;
    text-align: center;
    font-size: 1.1rem;
}

/* ===== MAIN CONTENT ===== */
.main-content {
    margin-left: 260px;
    padding: 25px 35px;
    min-height: 100vh;
}

/* ===== TOP BAR ===== */
.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 28px;
    padding-bottom: 18px;
    border-bottom: 2px solid #e0e7ff;
}

.topbar h4 {
    margin: 0;
    color: #1e293b;
    font-weight: 700;
    font-size: 1.4rem;
}

.topbar .text-muted {
    color: #64748b !important;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 300px;
}

/* ===== STAT CARDS ===== */
.stat-card {
    border: none;
    border-radius: 16px;
    box-shadow: var(--card-shadow);
    transition: all 0.3s ease;
    overflow: hidden;
    background: #fff;
}

.stat-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
}

.stat-card:nth-child(1)::after { background: linear-gradient(90deg, #6366f1, #8b5cf6); }
.stat-card:nth-child(2)::after { background: linear-gradient(90deg, #10b981, #06b6d4); }
.stat-card:nth-child(3)::after { background: linear-gradient(90deg, #f59e0b, #f97316); }
.stat-card:nth-child(4)::after { background: linear-gradient(90deg, #ef4444, #ec4899); }

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-hover-shadow);
}

.stat-card .card-body {
    padding: 1.4rem;
    position: relative;
}

.stat-card .stat-icon {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    color: #fff;
}

.col-md-3:nth-child(1) .stat-icon,
.col-md-4:nth-child(1) .stat-icon,
.col-md-6:nth-child(1) .stat-icon { background: linear-gradient(135deg, #6366f1, #8b5cf6) !important; }
.col-md-3:nth-child(2) .stat-icon,
.col-md-4:nth-child(2) .stat-icon,
.col-md-6:nth-child(2) .stat-icon { background: linear-gradient(135deg, #10b981, #06b6d4) !important; }
.col-md-3:nth-child(3) .stat-icon,
.col-md-4:nth-child(3) .stat-icon { background: linear-gradient(135deg, #f59e0b, #f97316) !important; }
.col-md-3:nth-child(4) .stat-icon { background: linear-gradient(135deg, #ef4444, #ec4899) !important; }

.stat-card .stat-value {
    font-size: 2rem;
    font-weight: 800;
    background: linear-gradient(135deg, #1e293b, #475569);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-card .stat-label {
    font-size: 0.75rem;
    color: #94a3b8;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

/* ===== CONTENT CARDS ===== */
.content-card {
    border: none;
    border-radius: 16px;
    box-shadow: var(--card-shadow);
    margin-bottom: 24px;
    overflow: hidden;
    background: #fff;
}

.content-card .card-header {
    background: linear-gradient(135deg, #fafafe, #f0f2ff);
    border-bottom: 2px solid #e0e7ff;
    font-weight: 700;
    padding: 1rem 1.5rem;
    color: #1e293b;
    font-size: 0.95rem;
}

/* ===== TABLES ===== */
.table {
    margin-bottom: 0;
}

.table th {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #64748b;
    border-top: none;
    background: #f8faff;
    padding: 0.85rem 1rem;
    font-weight: 700;
}

.table td {
    padding: 0.85rem 1rem;
    vertical-align: middle;
    color: #334155;
}

.table tbody tr {
    transition: background 0.2s;
}

.table-hover tbody tr:hover {
    background: #f0f2ff;
}

/* ===== BADGES ===== */
.badge {
    font-weight: 600;
    letter-spacing: 0.3px;
    padding: 0.4em 0.75em;
    border-radius: 8px;
    font-size: 0.75rem;
}

.badge.bg-success {
    background: linear-gradient(135deg, #10b981, #059669) !important;
}

.badge.bg-warning {
    background: linear-gradient(135deg, #f59e0b, #d97706) !important;
    color: #fff !important;
}

.badge.bg-secondary {
    background: linear-gradient(135deg, #64748b, #475569) !important;
}

.badge.bg-danger {
    background: linear-gradient(135deg, #ef4444, #dc2626) !important;
}

.badge.bg-primary {
    background: linear-gradient(135deg, #6366f1, #4f46e5) !important;
}

.badge.bg-info {
    background: linear-gradient(135deg, #06b6d4, #0891b2) !important;
}

.badge-role {
    font-size: 0.72rem;
    padding: 0.38em 0.7em;
    border-radius: 8px;
}

/* ===== BUTTONS ===== */
.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border: none;
    font-weight: 600;
    border-radius: 10px;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(99,102,241,0.25);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(99,102,241,0.35);
    background: linear-gradient(135deg, var(--primary-dark), #7c3aed);
}

.btn-outline-primary {
    color: var(--primary);
    border-color: var(--primary);
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s;
}

.btn-outline-primary:hover {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-color: transparent;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(99,102,241,0.25);
}

.btn-outline-danger {
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s;
}

.btn-outline-danger:hover {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    border-color: transparent;
}

.btn-outline-success {
    border-radius: 8px;
    font-weight: 600;
    color: var(--success);
    border-color: var(--success);
    transition: all 0.3s;
}

.btn-outline-success:hover {
    background: linear-gradient(135deg, #10b981, #059669);
    border-color: transparent;
    transform: translateY(-1px);
}

.btn-outline-secondary {
    border-radius: 8px;
    font-weight: 600;
}

.btn-group-sm .btn {
    border-radius: 8px !important;
    font-weight: 600;
    padding: 0.35rem 0.9rem;
}

/* ===== FORMS ===== */
.form-control, .form-select {
    border-radius: 10px;
    border: 2px solid #e2e8f0;
    padding: 0.6rem 0.9rem;
    transition: all 0.3s;
    font-size: 0.9rem;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99,102,241,0.12);
}

.form-label {
    font-weight: 600;
    color: #374151;
    font-size: 0.85rem;
    margin-bottom: 0.4rem;
}

/* ===== QUESTION CARDS (Test Taking) ===== */
.question-card {
    border: 2px solid #e0e7ff;
    border-radius: 16px;
    padding: 1.75rem;
    margin-bottom: 1.25rem;
    background: #fff;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.question-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--primary), var(--secondary));
    border-radius: 4px 0 0 4px;
}

.question-card:hover {
    border-color: var(--primary-light);
    box-shadow: 0 4px 20px rgba(99,102,241,0.1);
}

.question-card .q-number {
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.6rem;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.likert-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 0.75rem;
}

.likert-group .btn-outline-primary {
    border-radius: 10px;
    font-weight: 600;
    padding: 0.5rem 1rem;
    border-width: 2px;
    transition: all 0.25s;
}

.likert-group .btn-check:checked + .btn-outline-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-color: transparent;
    color: #fff;
    box-shadow: 0 4px 12px rgba(99,102,241,0.3);
    transform: scale(1.05);
}

/* ===== ALERTS ===== */
.alert {
    border-radius: 12px;
    border: none;
    font-weight: 500;
}

.alert-info {
    background: linear-gradient(135deg, #eff6ff, #dbeafe);
    color: #1e40af;
    border-left: 4px solid #3b82f6;
}

.alert-success {
    background: linear-gradient(135deg, #f0fdf4, #dcfce7);
    color: #166534;
    border-left: 4px solid #22c55e;
}

.alert-danger {
    background: linear-gradient(135deg, #fef2f2, #fee2e2);
    color: #991b1b;
    border-left: 4px solid #ef4444;
}

.alert-warning {
    background: linear-gradient(135deg, #fffbeb, #fef3c7);
    color: #92400e;
    border-left: 4px solid #f59e0b;
}

.flash-message {
    border-radius: 12px;
    border: none;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    animation: slideDown 0.4s ease;
}

@keyframes slideDown {
    from { transform: translateY(-20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

/* ===== MODALS ===== */
.modal-content {
    border: none;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
    overflow: hidden;
}

.modal-header {
    background: linear-gradient(135deg, #f0f2ff, #e0e7ff);
    border-bottom: 2px solid #c7d2fe;
    padding: 1.2rem 1.5rem;
}

.modal-title {
    font-weight: 700;
    color: var(--primary-dark);
}

.modal-footer {
    border-top: 1px solid #f0f0f0;
    padding: 1rem 1.5rem;
}

/* ===== SCROLLBAR ===== */
.sidebar::-webkit-scrollbar {
    width: 4px;
}

.sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.15);
    border-radius: 4px;
}

/* ===== FOOTER ===== */
footer {
    color: #94a3b8 !important;
    font-size: 0.8rem;
}

footer small {
    color: #94a3b8;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    .sidebar.show {
        transform: translateX(0);
    }
    .main-content {
        margin-left: 0;
        padding: 12px;
    }
    .topbar {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
        margin-bottom: 18px;
        padding-bottom: 12px;
    }
    .topbar h4 {
        font-size: 1.15rem;
    }
    .stat-card .stat-value {
        font-size: 1.5rem;
    }
    .stat-card .stat-label {
        font-size: 0.65rem;
    }
    .stat-card .stat-icon {
        width: 40px;
        height: 40px;
        border-radius: 10px;
        font-size: 1.1rem;
    }
    .stat-card .card-body {
        padding: 1rem;
    }
    .content-card .card-header {
        padding: 0.8rem 1rem;
        font-size: 0.85rem;
    }
    .table th, .table td {
        padding: 0.6rem 0.7rem;
        font-size: 0.8rem;
    }
    .table th {
        font-size: 0.65rem;
    }
    .modal-dialog {
        margin: 0.5rem;
    }
    .btn-group-sm .btn {
        padding: 0.3rem 0.6rem;
        font-size: 0.75rem;
    }
    .alert {
        font-size: 0.85rem;
        padding: 0.7rem 1rem;
    }
}

@media (max-width: 400px) {
    .main-content {
        padding: 10px;
    }
    .stat-card .stat-value {
        font-size: 1.3rem;
    }
    .stat-card .card-body {
        padding: 0.8rem;
    }
    .login-card {
        margin: 0 10px;
        border-radius: 16px;
    }
    .login-card .card-body {
        padding: 1.5rem;
    }
}

/* ===== MISC UTILITIES ===== */
.text-gradient {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.table-primary {
    background-color: #eef2ff !important;
}

.border-bottom {
    border-color: #e2e8f0 !important;
}

hr {
    border-color: #e2e8f0;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.2s;
}

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