:root {
    --primary-color: #4F46E5;
    --primary-hover: #4338CA;
    --bg-color: #F3F4F6;
    --text-color: #1F2937;
    --text-muted: #6B7280;
    --card-bg: #FFFFFF;
    --border-color: #E5E7EB;
    --nav-bg: #FFFFFF;
    --input-bg: #FFFFFF;
    --warning-color: #F59E0B;
    --error-color: #EF4444;
    --success-bg: #DEF7EC;
    --success-text: #03543F;
    --error-bg: #FDE8E8;
    --error-text: #9B1C1C;
    --pending-bg: #FEF3C7;
    --pending-text: #92400E;
    --secondary-bg: #E5E7EB;
    --secondary-text: #374151;
}

[data-theme='dark'] {
    --bg-color: #111827;
    --text-color: #F9FAFB;
    --text-muted: #9CA3AF;
    --card-bg: #1F2937;
    --border-color: #374151;
    --nav-bg: #1F2937;
    --input-bg: #374151;
    --success-bg: #065F46;
    --success-text: #D1FAE5;
    --error-bg: #7F1D1D;
    --error-text: #FEE2E2;
    --pending-bg: #78350F;
    --pending-text: #FEF3C7;
    --secondary-bg: #374151;
    --secondary-text: #F9FAFB;
}

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

.no-select {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.5;
    min-height: 100vh;
}

a {
    text-decoration: none;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

@media (max-width: 640px) {
    .container {
        padding: 0 1rem;
    }
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: 12px;
    font-weight: 600;
    transition: all 0.2s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.btn-secondary {
    background-color: var(--secondary-bg);
    color: var(--secondary-text);
}

.btn-secondary:hover {
    background-color: var(--border-color);
    transform: translateY(-1px);
}

.card {
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    padding: 2rem;
}

.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #4F46E5 0%, #0EA5E9 100%);
}

[data-theme='dark'] .login-page {
    background: linear-gradient(135deg, #1e1b4b 0%, #0f172a 100%);
}

.login-card {
    width: 100%;
    max-width: 450px;
    text-align: center;
}

.login-header {
    margin-bottom: 2rem;
}

.login-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.input-group {
    margin-bottom: 1.5rem;
    text-align: left;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.input-group input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    background-color: var(--input-bg);
    color: var(--text-color);
    border-radius: 12px;
    font-size: 1rem;
}

.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
    gap: 1rem;
}

@media (max-width: 640px) {
    .dashboard-header {
        flex-direction: column;
        align-items: flex-start;
    }
}

.user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.avatar {
    width: 40px;
    height: 40px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

/* ==================== NAV ==================== */
.main-nav {
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background 0.3s;
}

[data-theme='dark'] .main-nav {
    background: rgba(31,41,55,0.85);
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

/* Brand */
.brand {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
    color: var(--text-color);
}

.brand-icon {
    font-size: 1.4rem;
    line-height: 1;
}

.brand-text {
    font-size: 1.15rem;
    font-weight: 800;
    letter-spacing: -0.3px;
    color: var(--text-color);
}

.brand-accent {
    color: var(--primary-color);
}

/* Desktop nav links */
.nav-links {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Pill nav link */
.nav-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.4rem 1rem;
    border-radius: 999px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-color);
    text-decoration: none;
    background: var(--secondary-bg);
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.nav-pill:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(79,70,229,0.3);
}

/* Icon button (theme toggle) */
.nav-icon-btn {
    background: var(--secondary-bg);
    border: none;
    cursor: pointer;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    transition: all 0.2s;
    color: var(--text-color);
}

.nav-icon-btn:hover {
    background: var(--border-color);
    transform: rotate(15deg) scale(1.1);
}

/* Profile avatar dropdown */
.nav-profile {
    position: relative;
}

.nav-avatar-btn {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    background: linear-gradient(135deg, var(--primary-color), #7C3AED);
    border: none;
    cursor: pointer;
    padding: 0.3rem 0.7rem 0.3rem 0.3rem;
    border-radius: 999px;
    color: white;
    font-weight: 700;
    font-size: 0.9rem;
    transition: all 0.2s;
    box-shadow: 0 2px 8px rgba(79,70,229,0.35);
}

.nav-avatar-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(79,70,229,0.45);
}

#navAvatarInitial {
    width: 28px;
    height: 28px;
    background: rgba(255,255,255,0.25);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
}

/* Dropdown panel */
.nav-dropdown {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    width: 240px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
    padding: 0.5rem;
    opacity: 0;
    transform: translateY(-8px) scale(0.97);
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.nav-dropdown.open {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: all;
}

.nav-dropdown-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 0.5rem;
}

.nav-dropdown-avatar {
    width: 40px;
    height: 40px;
    min-width: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), #7C3AED);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1rem;
}

.nav-dropdown-name {
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--text-color);
}

.nav-dropdown-email {
    font-size: 0.78rem;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 160px;
}

.nav-dropdown-divider {
    height: 1px;
    background: var(--border-color);
    margin: 0.25rem 0;
}

.nav-dropdown-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.65rem 0.75rem;
    border-radius: 10px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-color);
    background: none;
    border: none;
    cursor: pointer;
    text-align: left;
    transition: background 0.15s;
    font-family: inherit;
}

.nav-dropdown-item:hover {
    background: var(--secondary-bg);
}

.nav-dropdown-logout {
    color: #EF4444;
}

.nav-dropdown-logout:hover {
    background: rgba(239,68,68,0.08);
}

/* Mobile controls */
.nav-mobile-controls {
    display: none;
    align-items: center;
    gap: 0.5rem;
}

/* Hamburger button */
.hamburger-btn {
    background: var(--secondary-bg);
    border: none;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 38px;
    height: 38px;
    border-radius: 10px;
    transition: background 0.2s;
}

.hamburger-btn:hover { background: var(--border-color); }

.hamburger-btn span {
    display: block;
    width: 18px;
    height: 2px;
    background: var(--text-color);
    border-radius: 2px;
    transition: all 0.3s ease;
    transform-origin: center;
}

.hamburger-btn.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger-btn.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger-btn.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile drawer */
.mobile-menu {
    overflow: hidden;
    max-height: 0;
    transition: max-height 0.35s cubic-bezier(0.4,0,0.2,1), opacity 0.25s ease;
    opacity: 0;
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
}

.mobile-menu.open {
    max-height: 600px;
    opacity: 1;
}

.mobile-menu-profile {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    padding: 1.1rem 1.5rem 0.75rem;
}

.mobile-menu-avatar {
    width: 44px;
    height: 44px;
    min-width: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), #7C3AED);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
}

.mobile-menu-name {
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--text-color);
}

.mobile-menu-email {
    font-size: 0.78rem;
    color: var(--text-muted);
}

.mobile-menu-divider {
    height: 1px;
    background: var(--border-color);
    margin: 0.25rem 0;
}

.mobile-menu-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.85rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-color);
    text-decoration: none;
    transition: background 0.15s;
}

.mobile-menu-item:hover { background: var(--secondary-bg); }

.mobile-menu-btn {
    background: none;
    border: none;
    cursor: pointer;
    text-align: left;
    width: 100%;
    font-family: inherit;
}

.mobile-menu-logout { color: #EF4444; }
.mobile-menu-logout:hover { background: rgba(239,68,68,0.06); }

.mobile-menu-icon { font-size: 1.1rem; width: 22px; text-align: center; }

/* Responsive */
@media (max-width: 640px) {
    .nav-links { display: none; }
    .nav-mobile-controls { display: flex; }
}

.quiz-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

@media (max-width: 480px) {
    .quiz-grid {
        grid-template-columns: 1fr;
    }
}

.quiz-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    transition: all 0.2s ease;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.quiz-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    border-color: var(--primary-color);
}

.quiz-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.quiz-meta {
    margin-top: auto;
    padding-top: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.quiz-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2rem;
    margin-top: 2rem;
}

.timer-badge {
    position: fixed;
    top: 5rem;
    right: 1.5rem;
    background: var(--card-bg);
    padding: 0.75rem 1.25rem;
    border-radius: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--primary-color);
    z-index: 100;
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.timer-badge.timer-danger {
    background-color: var(--error-color) !important;
    color: white !important;
    border-color: var(--error-color);
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }

    100% {
        transform: scale(1);
    }
}

[data-theme='dark'] .timer-badge {
    color: var(--text-color);
}

@media (max-width: 1024px) {
    .timer-badge {
        top: auto;
        bottom: 2rem;
        right: 1.5rem;
        font-size: 1rem;
        padding: 0.6rem 1rem;
    }
}

@media (max-width: 640px) {
    .timer-badge {
        right: 1rem;
        bottom: 1rem;
    }
}

.question-palette {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    height: fit-content;
}

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

.palette-btn {
    width: 100%;
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    border-radius: 0.375rem;
    font-size: 0.875rem;
    cursor: pointer;
}

.palette-btn.active {
    background-color: var(--primary-color);
    color: white;
}

.palette-btn.answered {
    background-color: #DEF7EC;
    color: #03543F;
}

[data-theme='dark'] .palette-btn.answered {
    background-color: #065F46;
    color: #D1FAE5;
}

.palette-btn.flagged {
    background-color: var(--warning-color) !important;
    color: white !important;
}

.question-area {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
}

@media (max-width: 768px) {
    .question-area {
        padding: 1.5rem;
    }
}

.option-group {
    display: grid;
    gap: 1rem;
    margin-bottom: 2rem;
}

.option-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s;
}

.option-card:hover {
    background-color: var(--bg-color);
}

.option-card.selected {
    background-color: #EEF2FF;
    border-color: var(--primary-color);
}

[data-theme='dark'] .option-card.selected {
    background-color: #312E81;
}

.option-circle {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
}

.option-card.selected .option-circle {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.nav-controls {
    display: flex;
    justify-content: space-between;
    margin-top: 3rem;
    gap: 0.5rem;
}

@media (max-width: 480px) {
    .nav-controls {
        flex-direction: column-reverse;
    }

    .nav-controls .btn {
        width: 100%;
    }
}

.progress-container {
    width: 100%;
    height: 4px;
    background-color: var(--border-color);
    position: fixed;
    top: 60px;
    z-index: 95;
}

.main-nav {
    background: var(--nav-bg);
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    padding: 1rem 0;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    color: var(--primary-color);
    font-size: 1.25rem;
}

@media (max-width: 480px) {
    .brand span {
        display: none;
    }
}

.progress-bar {
    height: 100%;
    background-color: var(--primary-color);
    width: 0%;
    transition: width 0.3s ease;
}

@media (max-width: 768px) {
    .quiz-layout {
        grid-template-columns: 1fr;
        margin-top: 1rem;
    }
}

@media (max-width: 640px) {
    .review-header {
        flex-direction: column;
        gap: 0.5rem;
    }

    .status-badge {
        align-self: flex-start;
    }

    .score-circle {
        width: 120px;
        height: 120px;
        font-size: 2rem;
    }
}

[data-theme='dark'] .swal2-popup {
    background-color: var(--card-bg) !important;
    color: var(--text-color) !important;
}

[data-theme='dark'] .swal2-title,
[data-theme='dark'] .swal2-html-container {
    color: var(--text-color) !important;
}

[data-theme='dark'] .swal2-confirm {
    background-color: var(--primary-color) !important;
}

.theme-toggle {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
    color: var(--text-color);
}

.theme-toggle:hover {
    background: var(--bg-color);
}

/* STYLING FOR ADMIN PAGE */
.admin-section {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

.question-form-card {
    background: var(--bg-color);
    padding: 1.5rem;
    border-radius: 12px;
    margin-bottom: 1rem;
    position: relative;
    border: 1px solid var(--border-color);
}

.remove-q-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    color: var(--error-color);
    cursor: pointer;
    font-size: 0.9rem;
    background: var(--error-bg);
    border: none;
    font-weight: 600;
    padding: 0.4rem 0.8rem;
    border-radius: 8px;
    transition: all 0.2s;
}

.remove-q-btn:hover {
    background-color: var(--error-color);
    color: white;
}

.options-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

@media (max-width: 640px) {
    .options-grid {
        grid-template-columns: 1fr;
    }
}

.option-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.option-prefix {
    position: absolute;
    left: 1rem;
    font-weight: 700;
    color: var(--primary-color);
    pointer-events: none;
    font-size: 0.9rem;
    opacity: 0.7;
}

.q-opt {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2.5rem !important;
    border: 1px solid var(--border-color);
    background: var(--input-bg);
    color: var(--text-color);
    border-radius: 10px;
    font-size: 0.95rem;
    transition: all 0.2s;
}

.q-opt:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
    background: var(--card-bg);
}

.correct-option-selector {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    margin-top: 1rem;
}

.correct-option-btn {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--input-bg);
    color: var(--text-color);
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s;
}

.correct-option-btn.selected {
    background: var(--success-color);
    color: white;
    border-color: var(--success-color);
}

.type-selector {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    background: var(--bg-color);
    padding: 0.25rem;
    border-radius: 12px;
    width: fit-content;
}

.type-btn {
    padding: 0.5rem 1rem;
    border: none;
    background: transparent;
    color: var(--text-muted);
    border-radius: 10px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.2s;
}

.type-btn.active {
    background: var(--card-bg);
    color: var(--primary-color);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}


/* History Styles */
.history-list {
    display: grid;
    gap: 0.75rem;
}

.history-item {
    background: var(--card-bg);
    padding: 1rem 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: transform 0.2s;
}

.history-item:hover {
    transform: translateX(4px);
}

.history-info {
    display: flex;
    flex-direction: column;
}

.history-score {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--primary-color);
}

.history-percentage {
    font-size: 0.8rem;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    background: var(--bg-color);
    margin-left: 0.5rem;
}

@media (max-width: 640px) {
    .history-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
}



/* Result Styles */
.score-circle {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin: 0 auto 2rem;
    border: 8px solid var(--border-color);
    color: var(--primary-color);
    background: var(--card-bg);
}

.score-circle.pass {
    border-color: var(--success-color);
    color: var(--success-color);
}

.score-circle.fail {
    border-color: var(--error-color);
    color: var(--error-color);
}

.review-card {
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    background: var(--card-bg);
}

.review-header {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    font-weight: 600;
    color: var(--text-color);
}

.status-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.8rem;
    font-weight: 600;
}

.status-correct {
    background-color: var(--success-bg);
    color: var(--success-text);
}

.status-wrong {
    background-color: var(--error-bg);
    color: var(--error-text);
}

.status-pending {
    background-color: var(--pending-bg);
    color: var(--pending-text);
}

.skeleton {
    background: var(--bg-color);
    background: linear-gradient(90deg, var(--bg-color) 25%, var(--border-color) 50%, var(--bg-color) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite linear;
    border-radius: 8px;
    height: 1rem;
    width: 100%;
}

.skeleton-card {
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    border-radius: 12px;
}

.skeleton-title {
    height: 1.25rem;
    width: 60%;
    margin-bottom: 0.75rem;
}

.skeleton-text {
    height: 0.85rem;
    width: 90%;
}

@keyframes skeleton-loading {
    0% {
        background-position: 200% 0;
    }

    100% {
        background-position: -200% 0;
    }
}

.fade-in {
    animation: fadeIn 0.4s ease-out forwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Analytics Dashboard */
.analytics-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.analytics-card {
    padding: 1.5rem;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.analytics-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.analytics-icon {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
}

.analytics-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-color);
}

.analytics-label {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 0.25rem;
    font-weight: 500;
}

@media (max-width: 768px) {
    .analytics-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .analytics-grid {
        grid-template-columns: 1fr;
    }

    .analytics-card {
        padding: 1.25rem;
        display: flex;
        align-items: center;
        text-align: left;
        gap: 1.5rem;
    }

    .analytics-icon {
        font-size: 2rem;
        margin-bottom: 0;
    }

    .analytics-value {
        font-size: 1.5rem;
    }
}

.quiz-instructions {
    background: var(--bg-color);
    padding: 1rem 1.5rem;
    border-radius: 12px;
    border-left: 4px solid var(--primary-color);
    margin: 1rem 0;
    font-size: 0.95rem;
    color: var(--text-color);
    line-height: 1.6;
}

.q-textarea {
    width: 100%;
    min-height: 150px;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    background: var(--input-bg);
    color: var(--text-color);
    font-size: 1rem;
    font-family: inherit;
    resize: vertical;
    transition: all 0.2s;
}

.q-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}



.answer-row {
    display: grid;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.answer-label {
    color: var(--text-muted);
}

.answer-value {
    color: var(--text-color);
    font-weight: 500;
}

.correct-value {
    color: var(--success-color);
    font-weight: 600;
}

@media (max-width: 768px) {
    .admin-section {
        padding: 1.5rem;
    }

    .input-grid {
        grid-template-columns: 1fr !important;
    }
}

.auth-tab {
    flex: 1;
    padding: 0.75rem 1rem;
    border: none;
    background: transparent;
    color: var(--text-muted);
    border-radius: 10px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 600;
    transition: all 0.2s;
}

.auth-tab.active {
    background: var(--card-bg);
    color: var(--primary-color);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.auth-tab:hover:not(.active) {
    color: var(--text-color);
}

.role-btn {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    background: var(--input-bg);
    color: var(--text-color);
    border-radius: 12px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s;
    text-align: center;
}

.role-btn:hover {
    border-color: var(--primary-color);
}

.role-btn.selected {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.calculator-widget {
    position: fixed;
    bottom: 2rem;
    left: 2rem;
    width: 300px;
    background: rgba(var(--card-bg-rgb, 255, 255, 255), 0.8);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    overflow: hidden;
    user-select: none;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s ease;
}

[data-theme='dark'] .calculator-widget {
    background: rgba(31, 41, 55, 0.8);
}

.calc-header {
    background: var(--primary-color);
    color: white;
    padding: 0.75rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: move;
    font-weight: 600;
    font-size: 0.9rem;
}

.calc-close {
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
    opacity: 0.8;
    transition: opacity 0.2s;
}

.calc-close:hover {
    opacity: 1;
}

.calc-display-area {
    padding: 1rem;
}

#calcDisplay {
    width: 100%;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.75rem;
    text-align: right;
    font-size: 1.5rem;
    font-family: monospace;
    color: var(--text-color);
    outline: none;
}

.calc-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
    padding: 0 1rem 1rem;
}

.calc-btn {
    padding: 0.75rem;
    border: none;
    border-radius: 8px;
    background: var(--bg-color);
    color: var(--text-color);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 1rem;
}

.calc-btn:hover {
    background: var(--border-color);
    transform: scale(1.05);
}

.calc-btn:active {
    transform: scale(0.95);
}

.calc-btn.operator {
    background: var(--pending-bg);
    color: var(--pending-text);
}

.calc-btn.utility {
    background: var(--error-bg);
    color: var(--error-text);
}

.calc-btn.equal {
    background: var(--primary-color);
    color: white;
    grid-row: span 2;
}

@media (max-width: 640px) {
    .calculator-widget {
        width: 260px;
        bottom: 1rem;
        left: 1rem;
    }
}