/* Base styles */
:root {
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --success-color: #27ae60;
    --error-color: #e74c3c;
    --warning-color: #f39c12;
    --text-color: #333;
    --text-light: #666;
    --bg-color: #f5f6fa;
    --card-bg: #fff;
    --border-color: #ddd;
}

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

html {
    scrollbar-gutter: stable;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Navigation */
.navbar {
    background-color: var(--card-bg);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.nav-brand a {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

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

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

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

.nav-user {
    color: var(--text-light);
    font-weight: 500;
}

/* Main container */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem;
    flex: 1;
}

/* Footer */
.footer {
    background-color: var(--card-bg);
    padding: 1rem;
    text-align: center;
    color: var(--text-light);
    margin-top: auto;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s;
}

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

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

.btn-secondary {
    background-color: #95a5a6;
    color: white;
}

.btn-secondary:hover {
    background-color: #7f8c8d;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

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

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

.form-group small {
    display: block;
    margin-top: 0.25rem;
    color: var(--text-light);
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 1.5rem;
}

.alert-error {
    background-color: #fdeaea;
    color: var(--error-color);
    border: 1px solid var(--error-color);
}

.alert-success {
    background-color: #e8f8f0;
    color: var(--success-color);
    border: 1px solid var(--success-color);
}

/* Auth pages */
.auth-container {
    max-width: 400px;
    margin: 2rem auto;
    padding: 2rem;
    background-color: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.auth-container h1 {
    text-align: center;
    margin-bottom: 1.5rem;
}

.auth-form {
    margin-bottom: 1.5rem;
}

.auth-form .btn {
    width: 100%;
}

.auth-link {
    text-align: center;
    color: var(--text-light);
}

.auth-link a {
    color: var(--primary-color);
}

/* Quiz pages */
.quiz-container {
    max-width: 700px;
    margin: 0 auto;
}

.quiz-container h1 {
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-light);
    margin-bottom: 2rem;
}

.quiz-form {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

.quiz-header {
    display: flex;
    gap: 1rem;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.progress {
    font-weight: 600;
    color: var(--primary-color);
}

.category-badge,
.difficulty-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.875rem;
}

.category-badge {
    background-color: #e8f4fc;
    color: var(--primary-color);
}

.difficulty-badge {
    background-color: #eee;
}

.difficulty-easy {
    background-color: #e8f8f0;
    color: var(--success-color);
}

.difficulty-medium {
    background-color: #fef5e7;
    color: var(--warning-color);
}

.difficulty-hard {
    background-color: #fdeaea;
    color: var(--error-color);
}

.question-card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    margin-bottom: 1rem;
}

.question-text {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    line-height: 1.5;
}

.answers-grid {
    display: grid;
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.answer-option {
    display: flex;
    align-items: center;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

.answer-option:hover {
    border-color: var(--primary-color);
    background-color: #f8f9fa;
}

.answer-option input {
    margin-right: 1rem;
}

.answer-option input:checked + .answer-text {
    font-weight: 600;
}

.answer-option:has(input:checked) {
    border-color: var(--primary-color);
    background-color: #e8f4fc;
}

.answer-option.answer-correct,
.answer-option.answer-correct:has(input:checked) {
    border-color: var(--success-color);
    background-color: #e8f8f0;
}

.answer-option.answer-wrong,
.answer-option.answer-wrong:has(input:checked) {
    border-color: var(--error-color);
    background-color: #fdeaea;
}


.certainty-section {
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
    margin-bottom: 1.5rem;
}

.certainty-section h3 {
    margin-bottom: 1rem;
    font-size: 1rem;
}

.certainty-options {
    display: grid;
    gap: 0.5rem;
}

.certainty-options-8 {
    grid-template-columns: repeat(4, 1fr);
}

.certainty-options-6 {
    grid-template-columns: repeat(3, 1fr);
}

.certainty-option {
    cursor: pointer;
}

.certainty-option input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.certainty-label {
    display: block;
    padding: 0.55rem 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    text-align: center;
    transition: all 0.15s;
    white-space: nowrap;
    user-select: none;
}

.certainty-option:hover .certainty-label {
    border-color: var(--primary-color);
    background-color: #f0f8ff;
    color: var(--primary-color);
}

.certainty-option:has(input:checked) .certainty-label {
    border-color: var(--primary-color);
    background-color: var(--primary-color);
    color: #fff;
}

.form-actions {
    text-align: center;
}

.cancel-form {
    text-align: center;
}

/* Results page */
.results-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-card {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.stat-value {
    display: block;
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary-color);
}

.stat-label {
    display: block;
    color: var(--text-light);
    font-size: 0.875rem;
}

.stat-hint {
    display: block;
    color: var(--text-light);
    font-size: 0.75rem;
    margin-top: 0.25rem;
}

.stat-card.good .stat-value {
    color: var(--success-color);
}

.stat-card.medium .stat-value {
    color: var(--warning-color);
}

.stat-card.poor .stat-value {
    color: var(--error-color);
}

.calibration-message {
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 2rem;
    text-align: center;
}

.calibration-message.overconfident {
    background-color: #fef5e7;
    color: #d68910;
    border: 1px solid #f39c12;
}

.calibration-message.underconfident {
    background-color: #e8f4fc;
    color: #2874a6;
    border: 1px solid #3498db;
}

.calibration-message.calibrated {
    background-color: #e8f8f0;
    color: #1e8449;
    border: 1px solid #27ae60;
}

.answers-list,
.history-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.answer-review,
.history-item {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid var(--border-color);
}

.answer-review.correct,
.history-item.correct {
    border-left-color: var(--success-color);
}

.answer-review.incorrect,
.history-item.incorrect {
    border-left-color: var(--error-color);
}

.answer-header,
.history-header {
    display: flex;
    gap: 1rem;
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
}

.answer-status,
.history-status {
    font-weight: 600;
}

.answer-review.correct .answer-status,
.history-item.correct .history-status {
    color: var(--success-color);
}

.answer-review.incorrect .answer-status,
.history-item.incorrect .history-status {
    color: var(--error-color);
}

.answer-certainty,
.history-certainty {
    color: var(--text-light);
}

.answer-question,
.history-question {
    font-weight: 500;
    margin-bottom: 0.75rem;
}

.answer-details,
.history-answers {
    font-size: 0.9rem;
    color: var(--text-light);
}

.history-meta {
    color: var(--text-light);
    font-size: 0.875rem;
}

.history-date {
    margin-top: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-light);
}

.history-group {
    margin-bottom: 1.5rem;
}

.history-group-summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 1rem;
    cursor: pointer;
    user-select: none;
    list-style: none;
}

.history-group-summary::-webkit-details-marker {
    display: none;
}

.history-group-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-color);
}

.history-group-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-light);
    font-size: 0.875rem;
}

.history-chevron {
    display: inline-block;
    transition: transform 0.2s;
    font-size: 1.1rem;
}

.history-group[open] .history-chevron {
    transform: rotate(-180deg);
}

.results-actions,
.actions-section {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
}

/* Dashboard filter */
.filter-form {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 1.25rem 1.5rem;
    margin-bottom: 2rem;
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

.filter-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.875rem;
    align-items: flex-end;
}

.filter-field {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    flex: 1 1 130px;
}

.filter-field label {
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-light);
}

.filter-field input[type="date"],
.filter-field select {
    padding: 0.45rem 0.65rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.9rem;
    background: #fff;
    color: var(--text-color);
    height: 36px;
    width: 100%;
    transition: border-color 0.15s, box-shadow 0.15s;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23666' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.6rem center;
    padding-right: 1.8rem;
}

.filter-field input[type="date"] {
    background-image: none;
    padding-right: 0.65rem;
}

.filter-field input[type="date"]:focus,
.filter-field select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.15);
}

.filter-actions {
    display: flex;
    gap: 0.5rem;
    align-items: flex-end;
    flex-shrink: 0;
}

.btn-filter {
    padding: 0.45rem 1.25rem;
    font-size: 0.9rem;
    height: 36px;
    white-space: nowrap;
}

.btn-ghost {
    display: inline-flex;
    align-items: center;
    padding: 0.45rem 0.875rem;
    height: 36px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.9rem;
    color: var(--text-light);
    text-decoration: none;
    background: transparent;
    transition: all 0.15s;
    white-space: nowrap;
}

.btn-ghost:hover {
    border-color: #aaa;
    color: var(--text-color);
    background: #f5f5f5;
}

.filter-chips-row {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
}

.filter-chips-label {
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-light);
    white-space: nowrap;
    padding-top: 0.3rem;
    min-width: 5rem;
}

.filter-chips {
    display: flex;
    flex-wrap: nowrap;
    gap: 0.4rem;
}

.filter-chips-wrap {
    flex-wrap: wrap;
}

.filter-chip input {
    display: none;
}

.filter-chip span {
    display: inline-block;
    padding: 0.25rem 0.65rem;
    border: 1px solid var(--border-color);
    border-radius: 999px;
    font-size: 0.82rem;
    cursor: pointer;
    color: var(--text-color);
    transition: all 0.15s;
    white-space: nowrap;
}

.filter-chip span:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.filter-chip input:checked + span {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.filter-chip-disabled span {
    opacity: 0.35;
    cursor: default;
}

.filter-chip-disabled span:hover {
    border-color: var(--border-color);
    color: var(--text-color);
}

/* Dashboard */
.dashboard-container {
    max-width: 900px;
    margin: 0 auto;
}

.dashboard-container h1 {
    margin-bottom: 1.25rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.calibration-summary {
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    background-color: var(--card-bg);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.chart-section {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

.chart-section h2 {
    margin-bottom: 0.5rem;
}

.chart-description {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.chart-container {
    height: 300px;
}

.buckets-section {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

.buckets-section h2 {
    margin-bottom: 1rem;
}

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

.calibration-table th,
.calibration-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.calibration-table th {
    font-weight: 600;
    color: var(--text-light);
    font-size: 0.875rem;
}

.calibration-table td.overconfident {
    color: var(--error-color);
}

.calibration-table td.underconfident {
    color: var(--primary-color);
}

.calibration-table td.muted,
.calibration-table td.no-data {
    color: var(--text-light);
}

.calibration-table td.ci-range {
    font-size: 0.85rem;
    color: var(--text-light);
    white-space: nowrap;
}

.empty-state {
    text-align: center;
    padding: 3rem;
    background-color: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.empty-state h2 {
    margin-bottom: 1rem;
    color: var(--text-light);
}

.empty-state p {
    margin-bottom: 1.5rem;
    color: var(--text-light);
}

/* Calibration info */
.calibration-info {
    background-color: #e8f4fc;
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 2rem;
}

.calibration-info h3 {
    margin-bottom: 0.75rem;
    color: var(--primary-dark);
}

.calibration-info ul {
    margin: 0.75rem 0;
    padding-left: 1.5rem;
}

.calibration-info li {
    margin-bottom: 0.5rem;
}

/* Admin pages */
.admin-container {
    max-width: 900px;
    margin: 0 auto;
}

.admin-container h1 {
    margin-bottom: 1.5rem;
}

.admin-actions {
    margin-bottom: 1.5rem;
}

.users-table {
    width: 100%;
    background-color: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    border-collapse: collapse;
    overflow: hidden;
}

.users-table th,
.users-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.users-table th {
    background-color: #f8f9fa;
    font-weight: 600;
    color: var(--text-light);
}

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

.role-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
}

.role-admin {
    background-color: #fef5e7;
    color: var(--warning-color);
}

.role-user {
    background-color: #e8f4fc;
    color: var(--primary-color);
}

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

.btn-danger:hover {
    background-color: #c0392b;
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.inline-form {
    display: inline;
}

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

.admin-nav {
    margin-top: 2rem;
}

/* Responsive */
@media (max-width: 600px) {
    .navbar {
        padding: 0.75rem 1rem;
        gap: 0.5rem;
    }

    .nav-brand a {
        font-size: 1.2rem;
    }

    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.75rem;
    }

    .container {
        padding: 1rem;
    }

    /* Quiz */
    .certainty-options-8,
    .certainty-options-6 {
        grid-template-columns: repeat(2, 1fr);
    }

    .question-text {
        font-size: 1.1rem;
    }

    /* Filters */
    .filter-form {
        padding: 1rem;
    }

    .filter-field {
        flex: 1 1 100%;
    }

    .filter-actions {
        width: 100%;
    }

    .btn-filter,
    .btn-ghost {
        flex: 1;
        justify-content: center;
    }

    .filter-chips-row {
        flex-direction: column;
        gap: 0.4rem;
    }

    .filter-chips-label {
        min-width: unset;
        padding-top: 0;
    }

    .filter-chips {
        flex-wrap: wrap;
    }

    /* Dashboard stats */
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    /* Calibration table: horizontal scroll */
    .buckets-section {
        padding: 1rem;
    }

    .calibration-table-wrapper {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .calibration-table {
        min-width: 480px;
    }

    /* Hide less critical columns on small screens */
    .calibration-table .col-expected,
    .calibration-table .col-ci {
        display: none;
    }

    /* Chart */
    .chart-section {
        padding: 1rem;
    }

    .chart-container {
        height: 220px;
    }

    /* History */
    .history-header {
        display: grid;
        grid-template-columns: 1fr auto;
        grid-template-rows: auto auto;
        gap: 0.25rem 0.5rem;
    }

    .history-status   { grid-column: 1; grid-row: 1; }
    .history-time     { grid-column: 2; grid-row: 1; text-align: right; }
    .history-certainty { grid-column: 1; grid-row: 2; }
    .history-meta     { grid-column: 2; grid-row: 2; text-align: right; }

    /* Actions */
    .results-actions,
    .actions-section {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        text-align: center;
    }

    /* Admin */
    .users-table {
        font-size: 0.875rem;
    }

    .users-table th,
    .users-table td {
        padding: 0.75rem 0.5rem;
    }
}