/* Online Exam System - Modern High-Contrast Stylesheet */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #06b6d4;
    --bg-body: #f1f5f9;
    --card-bg: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border-color: #cbd5e1;

    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 14px rgba(15, 23, 42, 0.1);
    --shadow-lg: 0 12px 28px rgba(15, 23, 42, 0.15);
}

body {
    background-color: var(--bg-body) !important;
    color: var(--text-main) !important;
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.main-content {
    flex: 1;
}

/* ==========================================================================
   Navbar - Dark Navy High-Contrast Header
   ========================================================================== */
.navbar-custom {
    background-color: #0f172a !important;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%) !important;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25) !important;
    padding: 0.85rem 0 !important;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1) !important;
}

.navbar-custom .navbar-brand {
    font-weight: 800 !important;
    font-size: 1.3rem !important;
    color: #ffffff !important;
    letter-spacing: -0.3px;
}

.navbar-custom .nav-link {
    color: #cbd5e1 !important;
    font-weight: 600 !important;
    padding: 0.5rem 1rem !important;
    border-radius: 8px !important;
    transition: all 0.2s ease !important;
}

.navbar-custom .nav-link:hover {
    color: #ffffff !important;
    background: rgba(255, 255, 255, 0.12) !important;
}

.navbar-custom .nav-link.active {
    color: #ffffff !important;
    background: #4f46e5 !important;
    box-shadow: 0 2px 8px rgba(79, 70, 229, 0.4) !important;
}

.user-badge {
    background: rgba(255, 255, 255, 0.15) !important;
    border: 1px solid rgba(255, 255, 255, 0.25) !important;
    backdrop-filter: blur(10px);
    border-radius: 30px !important;
    padding: 0.4rem 1rem !important;
    color: #ffffff !important;
    font-size: 0.875rem !important;
    font-weight: 700 !important;
}

.btn-logout {
    background-color: #ef4444 !important;
    color: #ffffff !important;
    border: none !important;
    font-weight: 700 !important;
    padding: 0.4rem 1.1rem !important;
    border-radius: 30px !important;
    transition: background 0.2s ease !important;
}

.btn-logout:hover {
    background-color: #dc2626 !important;
    color: #ffffff !important;
}

/* ==========================================================================
   Stat Cards - Rich Gradient Backgrounds & White Text
   ========================================================================== */
.stat-card {
    border-radius: 16px !important;
    padding: 1.6rem !important;
    box-shadow: var(--shadow-md) !important;
    transition: transform 0.25s ease, box-shadow 0.25s ease !important;
    position: relative !important;
    overflow: hidden !important;
}

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

.stat-card .stat-icon {
    font-size: 3.5rem !important;
    position: absolute !important;
    right: 1rem !important;
    bottom: 0.5rem !important;
}

/* Stat card color variants */
.stat-card-blue, .bg-gradient-blue {
    background: linear-gradient(135deg, #4f46e5 0%, #3730a3 100%) !important;
}

.stat-card-green, .bg-gradient-green {
    background: linear-gradient(135deg, #059669 0%, #047857 100%) !important;
}

.stat-card-purple {
    background: linear-gradient(135deg, #7c3aed 0%, #5b21b6 100%) !important;
}

.stat-card-orange, .bg-gradient-orange {
    background: linear-gradient(135deg, #d97706 0%, #b45309 100%) !important;
}

/* ==========================================================================
   Action & Feature Cards
   ========================================================================== */
.hover-card {
    border: 1px solid #e2e8f0 !important;
    border-radius: 16px !important;
    background: #ffffff !important;
    box-shadow: var(--shadow-sm) !important;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1) !important;
}

.hover-card:hover {
    transform: translateY(-4px) !important;
    box-shadow: var(--shadow-md) !important;
    border-color: #cbd5e1 !important;
}

/* Login Page */
.login-wrapper {
    min-height: 82vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-card {
    border: none !important;
    border-radius: 20px !important;
    box-shadow: var(--shadow-lg) !important;
    overflow: hidden !important;
    background: #ffffff !important;
}

.login-header {
    background: linear-gradient(135deg, #4f46e5 0%, #3730a3 100%) !important;
    color: #ffffff !important;
    padding: 2rem !important;
}

.login-card .nav-tabs {
    border-bottom: 2px solid #e2e8f0 !important;
}

.login-card .nav-tabs .nav-link {
    color: #64748b !important;
    font-weight: 600 !important;
    border: none !important;
    padding: 1rem 1.2rem !important;
    border-bottom: 3px solid transparent !important;
    transition: all 0.2s ease !important;
}

.login-card .nav-tabs .nav-link.active {
    color: #4f46e5 !important;
    border-bottom-color: #4f46e5 !important;
    background: transparent !important;
}

/* ==========================================================================
   Question Cards & Options
   ========================================================================== */
.question-card {
    background: #ffffff !important;
    border: 1px solid #e2e8f0 !important;
    border-radius: 16px !important;
    padding: 1.75rem !important;
    margin-bottom: 1.5rem !important;
    box-shadow: var(--shadow-sm) !important;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

:root {
    --exam-q-font-size: 1.2rem;
    --exam-body-font-size: 1.05rem;
}

.question-card .question-text {
    font-size: var(--exam-q-font-size) !important;
    line-height: 1.6 !important;
    transition: font-size 0.15s ease;
}

.question-card .option-wrapper {
    font-size: var(--exam-body-font-size) !important;
    transition: font-size 0.15s ease;
}

.descriptive-input {
    -webkit-user-select: text;
    -moz-user-select: text;
    -ms-user-select: text;
    user-select: text;
    font-size: var(--exam-body-font-size) !important;
    line-height: 1.65 !important;
    resize: vertical !important;
    min-height: 240px;
    transition: font-size 0.15s ease;
}

@media (min-width: 992px) {
    .descriptive-input {
        min-height: 300px;
    }
}

.option-wrapper {
    display: flex;
    align-items: center;
    padding: 0.9rem 1.2rem;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    margin-bottom: 0.75rem;
    cursor: pointer;
    background: #ffffff;
    transition: all 0.2s ease;
}

.option-wrapper:hover {
    background: #f8fafc;
    border-color: #94a3b8;
}

.option-wrapper.selected {
    background: #eef2ff !important;
    border-color: #4f46e5 !important;
    box-shadow: 0 0 0 1px #4f46e5 !important;
}

.option-wrapper input[type="radio"] {
    margin-right: 0.85rem;
    width: 1.2rem;
    height: 1.2rem;
    accent-color: #4f46e5;
}

/* Timer Box */
.timer-box {
    background: #0f172a !important;
    color: #ffffff !important;
    padding: 0.6rem 1.25rem !important;
    border-radius: 30px !important;
    font-weight: 700 !important;
    font-size: 1.05rem !important;
    display: inline-flex !important;
    align-items: center !important;
    gap: 0.5rem !important;
    box-shadow: 0 4px 14px rgba(15, 23, 42, 0.3) !important;
}

.timer-box.warning {
    background: #ef4444 !important;
    animation: pulse 1s infinite alternate;
}

@keyframes pulse {
    from { transform: scale(1); }
    to { transform: scale(1.05); }
}

/* ==========================================================================
   Tables & Badges
   ========================================================================== */
.custom-table {
    border-collapse: separate !important;
    border-spacing: 0 !important;
}

.custom-table thead th {
    background: #f8fafc !important;
    color: #334155 !important;
    font-weight: 700 !important;
    font-size: 0.85rem !important;
    text-transform: uppercase !important;
    letter-spacing: 0.5px !important;
    padding: 1rem 1.25rem !important;
    border-bottom: 2px solid #e2e8f0 !important;
}

.custom-table tbody td {
    padding: 1rem 1.25rem !important;
    vertical-align: middle !important;
    border-bottom: 1px solid #f1f5f9 !important;
}

.custom-table tbody tr:hover {
    background-color: #f8fafc !important;
}

.btn-primary {
    background-color: #4f46e5 !important;
    border-color: #4f46e5 !important;
    color: #ffffff !important;
    font-weight: 600 !important;
    border-radius: 10px !important;
    padding: 0.6rem 1.3rem !important;
    transition: all 0.2s ease !important;
}

.btn-primary:hover {
    background-color: #4338ca !important;
    border-color: #4338ca !important;
}

footer {
    background: #ffffff !important;
    border-top: 1px solid #e2e8f0 !important;
    padding: 1.25rem 0 !important;
    margin-top: auto !important;
}

.dropdown-toggle.no-caret::after {
    display: none !important;
}

/* ==========================================================================
   Table Top Horizontal Scrollbar & Sticky Actions
   ========================================================================== */
.table-scroll-top-container {
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: thin;
    scrollbar-color: #94a3b8 #f1f5f9;
    border-bottom: 1px solid #e2e8f0;
    background: #f8fafc;
    border-radius: 1rem 1rem 0 0;
}

.table-scroll-top-container::-webkit-scrollbar {
    height: 9px;
}

.table-scroll-top-container::-webkit-scrollbar-track {
    background: #f1f5f9;
}

.table-scroll-top-container::-webkit-scrollbar-thumb {
    background: #94a3b8;
    border-radius: 6px;
}

.table-scroll-top-container::-webkit-scrollbar-thumb:hover {
    background: #64748b;
}

.table-scroll-top-inner {
    height: 1px;
}

/* Sticky Right Actions Column */
.table-sticky-actions th:last-child,
.table-sticky-actions td:last-child {
    position: sticky;
    right: 0;
    background-color: #ffffff;
    box-shadow: -4px 0 8px rgba(15, 23, 42, 0.05);
    z-index: 2;
}

.table-sticky-actions thead th:last-child {
    background-color: #f8fafc !important;
    z-index: 3;
}

.table-sticky-actions tbody tr:hover td:last-child {
    background-color: #f8fafc !important;
}

/* ==========================================================================
   CBT Single-Question & Question Palette Styles
   ========================================================================== */
.question-palette-card {
    background: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 16px;
    padding: 1.25rem;
    box-shadow: var(--shadow-sm);
    margin-bottom: 1.5rem;
}

.palette-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    max-height: 140px;
    overflow-y: auto;
    padding: 4px 2px;
    scrollbar-width: thin;
    scrollbar-color: #cbd5e1 #f8fafc;
}

.palette-grid::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
.palette-grid::-webkit-scrollbar-track {
    background: #f8fafc;
    border-radius: 4px;
}
.palette-grid::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}

.palette-btn {
    width: 38px;
    height: 38px;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.88rem;
    border-radius: 10px;
    transition: all 0.15s ease-in-out;
    border: 2px solid #e2e8f0;
    background: #f8fafc;
    color: #475569;
    cursor: pointer;
    user-select: none;
}

.palette-btn:hover {
    border-color: #94a3b8;
    background: #e2e8f0;
    color: #0f172a;
    transform: translateY(-1px);
}

.palette-btn.unanswered-q {
    background: #f8fafc;
    border-color: #cbd5e1;
    color: #475569;
}

.palette-btn.answered-q {
    background: #10b981 !important;
    border-color: #10b981 !important;
    color: #ffffff !important;
    box-shadow: 0 2px 4px rgba(16, 185, 129, 0.25);
}

.palette-btn.answered-q:hover {
    background: #059669 !important;
    border-color: #059669 !important;
}

.palette-btn.active-q {
    border-color: #4f46e5 !important;
    outline: none !important;
    box-shadow: 0 0 0 3.5px rgba(79, 70, 229, 0.35) !important;
    transform: scale(1.06);
    z-index: 2;
}

.palette-legend-dot {
    width: 12px;
    height: 12px;
    border-radius: 4px;
    display: inline-block;
    vertical-align: middle;
    margin-right: 4px;
}
.palette-legend-dot.dot-answered {
    background: #10b981;
}
.palette-legend-dot.dot-unanswered {
    background: #f8fafc;
    border: 1px solid #cbd5e1;
}
.palette-legend-dot.dot-current {
    background: #4f46e5;
    box-shadow: 0 0 0 2px rgba(79, 70, 229, 0.35);
}