:root {
    color-scheme: light;
    --bg: #f7f5ef;
    --surface: #ffffff;
    --surface-alt: #fafaf5;
    --hover: #f0eee6;
    --chip: #f0eee6;
    --input-bg: #ffffff;
    --border: rgba(0, 0, 0, 0.12);
    --border-strong: rgba(0, 0, 0, 0.25);
    --track: rgba(0, 0, 0, 0.08);
    --text: #1a1a1a;
    --muted: #5f5e5a;
    --accent: #185fa5;
    --accent-hover: #0c447c;
    --accent-bg: #e6f1fb;
    --accent-focus: rgba(24, 95, 165, 0.15);
    --success: #3b6d11;
    --success-bg: #eaf3de;
    --danger: #a32d2d;
    --danger-bg: #fcebeb;
}

[data-theme='dark'] {
    color-scheme: dark;
    --bg: #12141a;
    --surface: #1b1e26;
    --surface-alt: #232732;
    --hover: #272c38;
    --chip: #2a2f3b;
    --input-bg: #1b1e26;
    --border: rgba(255, 255, 255, 0.12);
    --border-strong: rgba(255, 255, 255, 0.28);
    --track: rgba(255, 255, 255, 0.08);
    --text: #e8e6e0;
    --muted: #9aa0a8;
    --accent: #5aa3e8;
    --accent-hover: #7db8ef;
    --accent-bg: rgba(90, 163, 232, 0.15);
    --accent-focus: rgba(90, 163, 232, 0.3);
    --success: #8bc268;
    --success-bg: rgba(139, 194, 104, 0.14);
    --danger: #e27878;
    --danger-bg: rgba(226, 120, 120, 0.14);
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family:
        -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial,
        sans-serif;
    line-height: 1.55;
}

.wrap {
    max-width: 860px;
    margin: 0 auto;
    padding: 24px 20px 80px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

h1 {
    font-size: 22px;
    font-weight: 600;
    margin: 0 0 4px;
}
.subtitle {
    font-size: 13px;
    color: var(--muted);
    margin: 0;
}

.stats {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}
.stats[hidden] {
    display: none;
}
.stat {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 8px 12px;
    font-size: 12px;
    color: var(--muted);
}
.stat b {
    color: var(--text);
    font-weight: 600;
    font-size: 14px;
    display: block;
}

.controls {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    align-items: center;
    margin-bottom: 16px;
}
.controls .spacer {
    flex: 1;
}

#theme-toggle {
    padding: 8px 12px;
    line-height: 1;
    font-size: 16px;
}

.lang-toggle {
    display: inline-flex;
    background: var(--surface);
    border: 1px solid var(--border-strong);
    border-radius: 8px;
    overflow: hidden;
}
.lang-toggle .lang-btn {
    border: none;
    border-radius: 0;
    padding: 8px 12px;
    background: transparent;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.5px;
    color: var(--muted);
}
.lang-toggle .lang-btn:hover {
    background: var(--hover);
    color: var(--text);
}
.lang-toggle .lang-btn.active {
    background: var(--accent);
    color: #fff;
}

button {
    font: inherit;
    cursor: pointer;
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border-strong);
    border-radius: 8px;
    padding: 8px 14px;
    font-size: 14px;
    transition: all 0.15s;
}
button:hover {
    background: var(--hover);
}
button.primary {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}
button.primary:hover {
    background: var(--accent-hover);
}
button:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.progress {
    height: 6px;
    background: var(--track);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 18px;
}
.progress-bar {
    height: 100%;
    background: var(--accent);
    transition: width 0.3s;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 22px;
}

.q-num {
    font-size: 12px;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 6px;
}
.q-text {
    font-size: 16px;
    font-weight: 500;
    margin: 0 0 18px;
    line-height: 1.5;
}

.options {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.opt {
    display: flex;
    gap: 12px;
    align-items: flex-start;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: 10px;
    cursor: pointer;
    background: var(--surface);
    transition: all 0.15s;
    text-align: left;
    font: inherit;
    color: inherit;
    line-height: 1.45;
}
.opt:hover:not(:disabled) {
    border-color: var(--border-strong);
    background: var(--surface-alt);
}
.opt .letter {
    flex: 0 0 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--chip);
    color: var(--muted);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
}
.opt.selected {
    border-color: var(--accent);
    background: var(--accent-bg);
}
.opt.selected .letter {
    background: var(--accent);
    color: #fff;
}
.opt.correct {
    border-color: var(--success);
    background: var(--success-bg);
}
.opt.correct .letter {
    background: var(--success);
    color: #fff;
}
.opt.incorrect {
    border-color: var(--danger);
    background: var(--danger-bg);
}
.opt.incorrect .letter {
    background: var(--danger);
    color: #fff;
}
.opt:disabled {
    cursor: default;
}

.feedback {
    margin-top: 14px;
    padding: 10px 14px;
    border-radius: 8px;
    font-size: 14px;
    display: none;
}
.feedback.show {
    display: block;
}
.feedback.ok {
    background: var(--success-bg);
    color: var(--success);
}
.feedback.ko {
    background: var(--danger-bg);
    color: var(--danger);
}

.nav {
    display: flex;
    justify-content: space-between;
    gap: 8px;
    margin-top: 18px;
}

.jumper {
    margin-top: 22px;
}
.jumper summary {
    cursor: pointer;
    font-size: 13px;
    color: var(--muted);
    padding: 6px 0;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(40px, 1fr));
    gap: 6px;
    margin-top: 10px;
}
.grid button {
    padding: 8px 0;
    font-size: 12px;
    border-radius: 6px;
    border: 1px solid var(--border);
}
.grid button.done-ok {
    background: var(--success-bg);
    border-color: var(--success);
    color: var(--success);
}
.grid button.done-ko {
    background: var(--danger-bg);
    border-color: var(--danger);
    color: var(--danger);
}
.grid button.current {
    outline: 2px solid var(--accent);
    outline-offset: 1px;
}

.mode-toggle {
    display: inline-flex;
    background: var(--surface);
    border: 1px solid var(--border-strong);
    border-radius: 8px;
    overflow: hidden;
}
.mode-toggle button {
    border: none;
    border-radius: 0;
    padding: 8px 14px;
    background: transparent;
    font-size: 13px;
}
.mode-toggle button.active {
    background: var(--accent);
    color: #fff;
}

.summary-box {
    text-align: center;
    padding: 30px 20px;
}
.summary-score {
    font-size: 48px;
    font-weight: 600;
    color: var(--accent);
    margin: 8px 0;
}
.summary-label {
    color: var(--muted);
    font-size: 14px;
}

.setup-title {
    font-size: 18px;
    font-weight: 600;
    margin: 0 0 4px;
}
.setup-help {
    font-size: 13px;
    color: var(--muted);
    margin: 0 0 16px;
}
.setup-empty {
    font-size: 14px;
    color: var(--muted);
    margin: 8px 0;
}

.set-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 18px;
}

.set-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--surface);
    cursor: pointer;
    transition: all 0.15s;
}
.set-item:hover {
    border-color: var(--border-strong);
    background: var(--surface-alt);
}
.set-item input[type='checkbox'] {
    flex: 0 0 auto;
    width: 18px;
    height: 18px;
    accent-color: var(--accent);
    cursor: pointer;
}
.set-item:has(input:checked) {
    border-color: var(--accent);
    background: var(--accent-bg);
}

.set-info {
    flex: 1 1 auto;
    min-width: 0;
}
.set-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
}
.set-desc {
    font-size: 12px;
    color: var(--muted);
    margin-top: 2px;
}

.set-count {
    flex: 0 0 auto;
    font-size: 12px;
    color: var(--muted);
    background: var(--chip);
    border-radius: 999px;
    padding: 3px 10px;
    white-space: nowrap;
}
.set-item:has(input:checked) .set-count {
    background: var(--accent);
    color: #fff;
}

.setup-total {
    font-size: 13px;
    color: var(--muted);
    align-self: center;
}

.set-tag {
    display: inline-block;
    background: var(--chip);
    color: var(--muted);
    border-radius: 999px;
    padding: 1px 8px;
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0;
    text-transform: none;
    margin-left: 4px;
}

/* ---------- Resume banner (in-progress quiz) ---------- */

.resume-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 16px;
    border-color: var(--accent);
    background: var(--accent-bg);
}
.resume-info {
    flex: 1 1 auto;
    min-width: 0;
}
.resume-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 2px;
}
.resume-meta {
    font-size: 13px;
    color: var(--muted);
}
.resume-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

/* ---------- Comments & flagging ---------- */

.comments-host {
    margin-top: 22px;
    border-top: 1px solid var(--border);
    padding-top: 14px;
}

details.comments {
    font-size: 14px;
}
details.comments > summary {
    cursor: pointer;
    display: flex;
    gap: 6px;
    align-items: center;
    padding: 6px 0;
    list-style: none;
    color: var(--muted);
    font-size: 13px;
}
details.comments > summary::-webkit-details-marker {
    display: none;
}
details.comments > summary::before {
    content: '▸';
    font-size: 11px;
    transition: transform 0.15s;
    color: var(--muted);
}
details.comments[open] > summary::before {
    transform: rotate(90deg);
}
.comments-title {
    font-weight: 600;
    color: var(--text);
}
.comments-count {
    color: var(--muted);
}

.comments-body {
    padding: 8px 0 4px;
}
.comments-loading,
.comments-empty {
    color: var(--muted);
    font-size: 13px;
    padding: 10px 0;
    margin: 0;
}

.comments-list {
    list-style: none;
    padding: 0;
    margin: 6px 0 14px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.comment {
    background: var(--surface-alt);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 10px 12px;
}
.comment-badge {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    background: var(--chip);
    color: var(--muted);
    border-radius: 999px;
    padding: 2px 8px;
    margin-bottom: 4px;
}
.comment-badge.flag {
    background: var(--danger-bg);
    color: var(--danger);
}
.comment-meta {
    font-size: 12px;
    color: var(--muted);
    margin-bottom: 4px;
}
.comment-meta b {
    color: var(--text);
    font-weight: 600;
}
.comment-body {
    margin: 0;
    font-size: 14px;
    white-space: pre-wrap;
    word-break: break-word;
    line-height: 1.5;
}

.comments-add {
    background: transparent;
    border: 1px dashed var(--border-strong);
    color: var(--muted);
    padding: 8px 14px;
    border-radius: 8px;
    width: 100%;
    font-size: 13px;
}
.comments-add:hover {
    color: var(--text);
    border-style: solid;
    background: var(--hover);
}

.comment-form {
    margin-top: 6px;
    padding: 14px;
    background: var(--surface-alt);
    border: 1px solid var(--border);
    border-radius: 10px;
}
.comment-kind-tabs {
    display: inline-flex;
    background: var(--surface);
    border: 1px solid var(--border-strong);
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 12px;
}
.kind-tab {
    border: none;
    border-radius: 0;
    padding: 6px 12px;
    background: transparent;
    font-size: 13px;
    color: var(--text);
    cursor: pointer;
}
.kind-tab.active {
    background: var(--accent);
    color: #fff;
}
.comment-label {
    display: block;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--muted);
    margin: 10px 0 4px;
    font-weight: 600;
}
.cf-input {
    width: 100%;
    font: inherit;
    font-size: 14px;
    padding: 8px 10px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--input-bg);
    color: var(--text);
    line-height: 1.45;
    box-sizing: border-box;
}
textarea.cf-input {
    resize: vertical;
}
.cf-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-focus);
}
.flag-reason-row {
    margin-bottom: 4px;
}
.cf-hp {
    position: absolute !important;
    left: -9999px !important;
    width: 1px !important;
    height: 1px !important;
    opacity: 0 !important;
    pointer-events: none !important;
}
.cf-turnstile {
    margin: 12px 0;
    min-height: 65px;
}
.cf-actions {
    display: flex;
    gap: 8px;
    align-items: center;
    margin-top: 10px;
}
.cf-status {
    flex: 1;
    font-size: 12px;
    color: var(--muted);
}

@media (max-width: 520px) {
    h1 {
        font-size: 19px;
    }
    .card {
        padding: 18px 16px;
    }
    .q-text {
        font-size: 15px;
    }
    .set-item {
        padding: 10px 12px;
    }
    .set-count {
        font-size: 11px;
        padding: 2px 8px;
    }
    .resume-actions {
        width: 100%;
    }
    .resume-actions button {
        flex: 1 1 auto;
    }
    .comment-form {
        padding: 12px;
    }
}