/* ==========================================================================
   ApexExam Portal - Modern Dark Glassmorphic Design System
   ========================================================================== */

:root {
    --bg-main: #070913;
    --bg-surface: rgba(15, 23, 42, 0.75);
    --bg-surface-alt: rgba(30, 41, 59, 0.55);
    --bg-surface-hover: rgba(51, 65, 85, 0.65);
    --bg-card: rgba(15, 23, 42, 0.85);

    --border-color: rgba(148, 163, 184, 0.14);
    --border-color-light: rgba(148, 163, 184, 0.25);
    --border-glow: rgba(56, 189, 248, 0.4);

    --primary: #38bdf8;
    --primary-hover: #0ea5e9;
    --primary-glow: rgba(56, 189, 248, 0.25);

    --accent: #818cf8;
    --accent-hover: #6366f1;

    --success: #10b981;
    --success-bg: rgba(16, 185, 129, 0.15);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.15);
    --danger: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.15);
    --danger-border: rgba(239, 68, 68, 0.35);
    --info: #06b6d4;

    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --text-dim: #64748b;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.45);
    --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 20px rgba(56, 189, 248, 0.2);

    --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

/* --------------------------------------------------------------------------
   Reset & Base Styles
   -------------------------------------------------------------------------- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    width: 100%;
    min-height: 100%;
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 15px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* Canvas Honeycomb Layer */
#honeycomb-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 0;
}

/* App Container */
#app-root {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* --------------------------------------------------------------------------
   Typography & Utilities
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
    color: #ffffff;
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: -0.02em;
}

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

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

.text-primary { color: var(--primary); }
.text-accent { color: var(--accent); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-danger { color: var(--danger); }
.text-info { color: var(--info); }
.text-muted { color: var(--text-muted); }
.text-dim { color: var(--text-dim); }

.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }
.font-mono { font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace; }

.hidden { display: none !important; }

/* --------------------------------------------------------------------------
   Layout Containers & Grid
   -------------------------------------------------------------------------- */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.gap-6 { gap: 1.5rem; }
.flex-wrap { flex-wrap: wrap; }
.flex-1 { flex: 1 1 0%; }
.w-full { width: 100%; }

.grid { display: grid; }
.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

@media (min-width: 640px) {
    .sm\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .sm\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .sm\:flex-row { flex-direction: row; }
    .sm\:w-auto { width: auto; }
}

@media (min-width: 768px) {
    .md\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .md\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .md\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .md\:flex-row { flex-direction: row; }
    .md\:items-center { align-items: center; }
}

@media (min-width: 1024px) {
    .lg\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .lg\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* --------------------------------------------------------------------------
   Cards & Glassmorphism Surfaces
   -------------------------------------------------------------------------- */
.card {
    background: var(--bg-surface);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.card:hover {
    border-color: var(--border-color-light);
}

.bg-surface-alt {
    background: var(--bg-surface-alt);
    border: 1px solid var(--border-color);
}

.bg-surface {
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border-color);
}

.rounded-lg { border-radius: var(--radius-md); }
.rounded-xl { border-radius: var(--radius-lg); }

/* --------------------------------------------------------------------------
   Navigation Bar
   -------------------------------------------------------------------------- */
.navbar {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(7, 9, 19, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    padding: 0.85rem 0;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 800;
    color: #ffffff;
    letter-spacing: -0.03em;
}

.brand-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    font-size: 1rem;
    box-shadow: 0 0 16px var(--primary-glow);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-link {
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.9rem;
    transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
    color: var(--primary);
}

/* Mobile Drawer */
#mobile-drawer {
    display: none;
    position: fixed;
    top: 60px;
    left: 0;
    width: 100%;
    background: rgba(15, 23, 42, 0.98);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem;
    z-index: 49;
    flex-direction: column;
    gap: 1rem;
}

#mobile-drawer.open {
    display: flex;
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.6rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    white-space: nowrap;
    user-select: none;
}

.btn:disabled {
    opacity: 0.55;
    cursor: not-allowed;
    pointer-events: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), #0284c7);
    color: #ffffff;
    box-shadow: 0 2px 10px rgba(56, 189, 248, 0.3);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #38bdf8, #0ea5e9);
    box-shadow: 0 4px 16px rgba(56, 189, 248, 0.45);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--bg-surface-alt);
    border-color: var(--border-color);
    color: var(--text-main);
}

.btn-secondary:hover {
    background: var(--bg-surface-hover);
    border-color: var(--border-color-light);
    color: #ffffff;
}

.btn-warning {
    background: var(--warning);
    color: #000000;
    font-weight: 700;
}

.btn-danger {
    background: var(--danger);
    color: #ffffff;
}

.btn-outline-danger {
    background: transparent;
    border-color: var(--danger);
    color: var(--danger);
}

.btn-outline-danger:hover {
    background: var(--danger-bg);
}

.btn-outline-success {
    background: transparent;
    border-color: var(--success);
    color: var(--success);
}

.btn-outline-success:hover {
    background: var(--success-bg);
}

.btn-outline-warning {
    background: transparent;
    border-color: var(--warning);
    color: var(--warning);
}

.btn-outline-warning:hover {
    background: var(--warning-bg);
}

.btn-sm { padding: 0.35rem 0.75rem; font-size: 0.8rem; }
.btn-xs { padding: 0.2rem 0.5rem; font-size: 0.75rem; border-radius: var(--radius-sm); }
.btn-lg { padding: 0.85rem 1.75rem; font-size: 1rem; border-radius: var(--radius-lg); }

/* --------------------------------------------------------------------------
   Badges & Pills
   -------------------------------------------------------------------------- */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.25rem 0.65rem;
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.badge-primary { background: rgba(56, 189, 248, 0.15); color: var(--primary); border: 1px solid rgba(56, 189, 248, 0.3); }
.badge-success { background: var(--success-bg); color: var(--success); border: 1px solid rgba(16, 185, 129, 0.3); }
.badge-warning { background: var(--warning-bg); color: var(--warning); border: 1px solid rgba(245, 158, 11, 0.3); }
.badge-danger { background: var(--danger-bg); color: var(--danger); border: 1px solid var(--danger-border); }
.badge-info { background: rgba(6, 182, 212, 0.15); color: var(--info); border: 1px solid rgba(6, 182, 212, 0.3); }
.badge-neutral { background: var(--bg-surface-alt); color: var(--text-muted); border: 1px solid var(--border-color); }

.share-code-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.2rem 0.6rem;
    font-size: 0.75rem;
    font-family: monospace;
    font-weight: 700;
    background: rgba(99, 102, 241, 0.15);
    color: #a5b4fc;
    border: 1px solid rgba(99, 102, 241, 0.35);
    border-radius: var(--radius-sm);
}

/* --------------------------------------------------------------------------
   Forms & Inputs
   -------------------------------------------------------------------------- */
.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 0.4rem;
}

.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: 0.65rem 0.95rem;
    font-size: 0.9rem;
    color: #ffffff;
    background: rgba(15, 23, 42, 0.8);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    outline: none;
    transition: var(--transition);
    font-family: inherit;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.form-checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    cursor: pointer;
}

.form-checkbox-label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--primary);
}

/* --------------------------------------------------------------------------
   Tables
   -------------------------------------------------------------------------- */
.table-responsive {
    width: 100%;
    overflow-x: auto;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.875rem;
}

th {
    background: rgba(15, 23, 42, 0.9);
    padding: 0.85rem 1rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--border-color);
}

td {
    padding: 0.85rem 1rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-main);
}

tr:last-child td {
    border-bottom: none;
}

tr:hover td {
    background: var(--bg-surface-hover);
}

.avatar-circle {
    width: 38px;
    height: 38px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--accent), var(--primary));
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
}

.avatar-circle-sm {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--accent), var(--primary));
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.75rem;
}

/* --------------------------------------------------------------------------
   Admin Sidebar & Portal Layout
   -------------------------------------------------------------------------- */
.admin-layout {
    display: grid;
    grid-template-columns: 240px 1fr;
    min-height: calc(100vh - 65px);
}

.admin-sidebar {
    background: rgba(11, 15, 29, 0.9);
    border-right: 1px solid var(--border-color);
    padding: 1.5rem 1rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.admin-nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.9rem;
    border-radius: var(--radius-md);
    margin-bottom: 0.35rem;
    transition: var(--transition);
}

.admin-nav-item:hover {
    color: #ffffff;
    background: var(--bg-surface-alt);
}

.admin-nav-item.active {
    color: var(--primary);
    background: rgba(56, 189, 248, 0.12);
    border-left: 3px solid var(--primary);
}

.admin-content-area {
    padding: 2rem;
    overflow-y: auto;
}

@media (max-width: 900px) {
    .admin-layout {
        grid-template-columns: 1fr;
    }
    .admin-sidebar {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
}

/* --------------------------------------------------------------------------
   Exam Live Cockpit Layout
   -------------------------------------------------------------------------- */
.exam-hud-header {
    position: sticky;
    top: 0;
    z-index: 40;
    background: rgba(7, 9, 19, 0.92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 1.5rem;
}

.exam-timer-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.45rem 1.15rem;
    background: rgba(15, 23, 42, 0.9);
    border: 1px solid var(--border-color-light);
    border-radius: var(--radius-full);
    font-size: 1.15rem;
    font-family: monospace;
    font-weight: 800;
    color: var(--primary);
    box-shadow: 0 0 12px rgba(56, 189, 248, 0.2);
}

.timer-warning {
    color: var(--danger) !important;
    border-color: var(--danger) !important;
    box-shadow: 0 0 16px rgba(239, 68, 68, 0.4) !important;
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.exam-layout-grid {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 1.5rem;
    padding: 1.5rem 0;
}

@media (max-width: 992px) {
    .exam-layout-grid {
        grid-template-columns: 1fr;
    }
}

/* Question Options */
.exam-option-card {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    padding: 0.85rem 1.15rem;
    background: var(--bg-surface-alt);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: 0.65rem;
}

.exam-option-card:hover {
    background: var(--bg-surface-hover);
    border-color: var(--border-color-light);
}

.exam-option-card.selected {
    background: rgba(56, 189, 248, 0.12);
    border-color: var(--primary);
    box-shadow: 0 0 12px var(--primary-glow);
}

.option-letter-badge {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-full);
    background: rgba(15, 23, 42, 0.9);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.exam-option-card.selected .option-letter-badge {
    background: var(--primary);
    color: #ffffff;
    border-color: var(--primary);
}

/* Question Palette */
.palette-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0.5rem;
}

.palette-btn {
    width: 100%;
    aspect-ratio: 1 / 1;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 0.85rem;
    border: 1px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.palette-unanswered {
    background: var(--bg-surface-alt);
    color: var(--text-muted);
    border-color: var(--border-color);
}

.palette-answered {
    background: var(--success-bg);
    color: var(--success);
    border-color: rgba(16, 185, 129, 0.4);
}

.palette-review {
    background: var(--warning-bg);
    color: var(--warning);
    border-color: rgba(245, 158, 11, 0.4);
}

.palette-current {
    box-shadow: 0 0 0 2px var(--primary), 0 0 12px var(--primary-glow);
    font-weight: 900;
}

/* Proctor Camera Floating Widget */
.proctor-camera-box {
    position: relative;
    width: 100%;
    height: 160px;
    background: #000000;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.proctor-camera-box video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: scaleX(-1); /* Mirror view */
}

/* --------------------------------------------------------------------------
   Modals & Popups
   -------------------------------------------------------------------------- */
.modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 100;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
}

.modal-overlay.show {
    opacity: 1;
    pointer-events: auto;
}

.modal-dialog {
    background: var(--bg-card);
    border: 1px solid var(--border-color-light);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    transform: scale(0.95);
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-dialog.modal-lg {
    max-width: 850px;
}

.modal-overlay.show .modal-dialog {
    transform: scale(1);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.75rem;
    padding: 1.25rem 1.5rem;
    border-top: 1px solid var(--border-color);
}

/* --------------------------------------------------------------------------
   Toast Notifications
   -------------------------------------------------------------------------- */
#toast-container {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    z-index: 200;
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
    max-width: 380px;
    width: 100%;
    pointer-events: none;
}

.toast {
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-color-light);
    border-radius: var(--radius-md);
    padding: 0.85rem 1.15rem;
    color: #ffffff;
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    transform: translateY(20px);
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    pointer-events: auto;
    font-size: 0.85rem;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

.toast-success { border-left: 4px solid var(--success); }
.toast-success .toast-icon { color: var(--success); }

.toast-warning { border-left: 4px solid var(--warning); }
.toast-warning .toast-icon { color: var(--warning); }

.toast-danger, .toast-error { border-left: 4px solid var(--danger); }
.toast-danger .toast-icon, .toast-error .toast-icon { color: var(--danger); }

.toast-info { border-left: 4px solid var(--primary); }
.toast-info .toast-icon { color: var(--primary); }

.toast-close {
    background: transparent;
    border: none;
    color: var(--text-dim);
    font-size: 1.1rem;
    cursor: pointer;
    margin-left: auto;
    line-height: 1;
}

.toast-close:hover {
    color: #ffffff;
}

/* --------------------------------------------------------------------------
   Custom Scrollbars
   -------------------------------------------------------------------------- */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: rgba(7, 9, 19, 0.5);
}
::-webkit-scrollbar-thumb {
    background: rgba(148, 163, 184, 0.25);
    border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(148, 163, 184, 0.45);
}