:root {
    --bg: #0b1220;
    --bg-soft: #111b2e;
    --panel: #ffffff;
    --panel-soft: #f5f7fb;
    --text: #182338;
    --muted: #61708a;
    --line: #dbe2ef;
    --primary: #0f4aa0;
    --primary-2: #1f6feb;
    --success: #0f9f6e;
    --danger: #cf3c4f;
    --warning: #e2a93b;
    --shadow: 0 16px 40px rgba(14, 23, 38, 0.08);
    --radius: 22px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; font-family: Inter, "Segoe UI", Arial, sans-serif; color: var(--text); background: linear-gradient(180deg, #eef3fb 0%, #f8fbff 100%); }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.app-shell { min-height: 100vh; }
.topbar {
    background: linear-gradient(135deg, var(--bg), #13223d);
    color: #fff;
    padding: 18px 24px;
    display: flex;
    gap: 16px;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 20;
    box-shadow: 0 8px 24px rgba(7, 14, 26, 0.18);
}
.brand { display: flex; align-items: center; gap: 14px; color: #fff; text-decoration: none; }
.brand:hover { text-decoration: none; }
.brand strong { display: block; font-size: 1rem; }
.brand small { display: block; color: rgba(255,255,255,.72); margin-top: 3px; }
.brand-badge {
    width: 48px; height: 48px; border-radius: 14px; display: grid; place-items: center;
    background: linear-gradient(135deg, var(--primary-2), #54a3ff); color: #fff; font-weight: 800;
    box-shadow: inset 0 1px 0 rgba(255,255,255,.25);
}
.nav { display: flex; gap: 10px; flex-wrap: wrap; }
.nav a {
    color: rgba(255,255,255,.85);
    padding: 10px 14px;
    border-radius: 999px;
    text-decoration: none;
}
.nav a.active, .nav a:hover { background: rgba(255,255,255,.12); color: #fff; }

.content { width: min(1200px, calc(100% - 32px)); margin: 28px auto 48px; }

.hero {
    display: grid;
    grid-template-columns: 1.2fr .8fr;
    gap: 24px;
    align-items: stretch;
}
.hero-copy, .hero-card, .panel, .card, .question-card, .result-card {
    background: var(--panel);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.hero-copy {
    padding: 34px;
    background: linear-gradient(135deg, #0d2f67 0%, #17438f 55%, #2164d7 100%);
    color: #fff;
}
.hero-copy h1 { font-size: clamp(2rem, 3.8vw, 3.35rem); margin: 12px 0 14px; line-height: 1.04; }
.hero-copy p { color: rgba(255,255,255,.86); font-size: 1.05rem; max-width: 64ch; }
.eyebrow, .badge {
    display: inline-flex;
    align-items: center;
    padding: 8px 12px;
    border-radius: 999px;
    font-size: .85rem;
    font-weight: 700;
    letter-spacing: .01em;
}
.eyebrow { background: rgba(255,255,255,.14); color: #fff; }
.badge { background: #eaf2ff; color: var(--primary); }
.hero-actions, .button-row, .card-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 22px; }

.hero-card { padding: 24px; background: linear-gradient(180deg, #ffffff 0%, #f6f9ff 100%); }
.stat-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; height: 100%; }
.stat-card {
    border: 1px solid #dbe4f5;
    border-radius: 18px;
    padding: 20px;
    background: rgba(255,255,255,.78);
}
.stat-card strong { display: block; font-size: 1.5rem; margin-bottom: 6px; }
.stat-card span { color: var(--muted); }

.page-header { display: flex; justify-content: space-between; gap: 18px; align-items: end; margin-bottom: 18px; }
.page-header h1 { margin: 8px 0 6px; font-size: clamp(1.65rem, 2.4vw, 2.3rem); }
.page-header p { margin: 0; color: var(--muted); }

.grid { display: grid; gap: 18px; }
.cards-3 { grid-template-columns: repeat(3, 1fr); margin-bottom: 22px; }
.admin-grid { grid-template-columns: 1fr 1fr; }

.card, .panel { padding: 22px; }
.card-hover { transition: transform .18s ease, box-shadow .18s ease; }
.card-hover:hover { transform: translateY(-3px); }
.card-top { display: flex; justify-content: space-between; gap: 12px; align-items: start; }
.card h2, .panel h2 { margin: 12px 0 10px; font-size: 1.2rem; }
.chip {
    background: var(--panel-soft);
    border: 1px solid var(--line);
    color: var(--muted);
    border-radius: 999px;
    padding: 8px 12px;
    white-space: nowrap;
    font-size: .9rem;
}
.metric-list { display: grid; gap: 10px; margin-top: 16px; }
.metric-list > div {
    display: flex; align-items: center; justify-content: space-between;
    padding: 11px 14px;
    background: var(--panel-soft);
    border-radius: 14px;
    border: 1px solid #ebf0f7;
}
.metric-list span, .muted { color: var(--muted); }

.btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 12px 18px; border-radius: 14px;
    font-weight: 700; text-decoration: none; border: none; cursor: pointer;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: #fff; }
.btn-secondary { background: #eaf1ff; color: var(--primary); }
.btn-large { padding: 14px 22px; font-size: 1rem; }

.flash {
    padding: 14px 16px; border-radius: 16px; margin-bottom: 14px; font-weight: 600;
}
.flash-success { background: #e8f8f1; color: #136847; }
.flash-error { background: #ffecef; color: #a62939; }
.flash-warning { background: #fff6df; color: #8d6114; }

.table-wrap { overflow: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 14px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: middle; }
th { color: var(--muted); font-size: .9rem; font-weight: 700; }
.status {
    display: inline-flex; align-items: center; border-radius: 999px;
    padding: 7px 11px; font-size: .85rem; font-weight: 700;
}
.status-pass { background: #e8f8f1; color: #13744f; }
.status-fail { background: #ffeff1; color: #b23243; }

.quiz-form { display: grid; gap: 18px; }
.question-card { padding: 22px; }
.question-head {
    display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap;
    margin-bottom: 10px;
}
.question-counter { font-weight: 800; color: var(--primary); }
.question-original-number { color: var(--muted); }
.question-card h2 { font-size: 1.1rem; margin: 0 0 16px; line-height: 1.45; }

.options { display: grid; gap: 10px; }
.option-row {
    display: grid;
    grid-template-columns: auto auto 1fr auto;
    gap: 12px;
    align-items: start;
    padding: 14px;
    border-radius: 16px;
    border: 1px solid #e3e9f3;
    background: #fbfdff;
}
.option-row input { margin-top: 2px; }
.option-key {
    width: 28px; height: 28px; border-radius: 50%;
    display: inline-grid; place-items: center;
    font-weight: 800; color: var(--primary);
    background: #edf4ff;
}
.result-option.selected { border-color: #aac5f5; background: #f5f9ff; }
.result-option.correct { border-color: #98d3ba; background: #edf9f3; }

.sticky-submit {
    position: sticky; bottom: 18px;
    display: flex; justify-content: space-between; gap: 16px; align-items: center;
    padding: 16px 18px;
    border-radius: 18px;
    background: rgba(11, 18, 32, 0.92);
    color: #fff;
    backdrop-filter: blur(12px);
    box-shadow: 0 18px 40px rgba(11, 18, 32, 0.22);
}
.sticky-submit small { display: block; color: rgba(255,255,255,.72); margin-top: 4px; }

.result-hero {
    padding: 24px;
    border-radius: var(--radius);
    color: #fff;
    display: flex; justify-content: space-between; gap: 18px; align-items: center;
    margin-bottom: 18px;
}
.result-pass { background: linear-gradient(135deg, #0b7d56, #16b577); }
.result-fail { background: linear-gradient(135deg, #9f243b, #db4f68); }
.result-hero h1 { margin: 10px 0 8px; }
.result-hero p { margin: 0; color: rgba(255,255,255,.87); }
.result-metrics { display: flex; gap: 18px; flex-wrap: wrap; }
.result-metrics > div {
    min-width: 150px;
    padding: 16px 18px;
    background: rgba(255,255,255,.12);
    border-radius: 18px;
}
.result-metrics strong { display: block; font-size: 1.45rem; }
.result-metrics span { color: rgba(255,255,255,.8); }

.result-list { display: grid; gap: 16px; }
.result-card { padding: 20px; }
.result-card.is-correct { border: 1px solid #cceadf; }
.result-card.is-wrong { border: 1px solid #f3c8d0; }
.result-card-head { display: flex; justify-content: space-between; gap: 14px; align-items: start; margin-bottom: 10px; }
.result-card h3 { margin: 0; }
.pill-group { display: flex; gap: 8px; flex-wrap: wrap; }
.pill {
    display: inline-flex; align-items: center; border-radius: 999px; padding: 6px 10px;
    background: #e7eefc; color: var(--primary); font-size: .8rem; font-weight: 700;
}
.pill-ok { background: #def4e9; color: #11714c; }

.stack-form { display: grid; gap: 14px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
label span { display: block; font-weight: 700; margin-bottom: 8px; }
input[type=text], input[type=number], select, textarea {
    width: 100%; padding: 12px 14px; border-radius: 14px; border: 1px solid var(--line);
    font: inherit; background: #fff;
}
textarea { resize: vertical; min-height: 120px; }
.option-admin-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.option-admin-row {
    display: grid; grid-template-columns: auto auto 1fr; gap: 10px; align-items: center;
    padding: 10px 12px; border-radius: 16px; border: 1px solid var(--line); background: var(--panel-soft);
}
.panel-header { display: flex; justify-content: space-between; gap: 12px; align-items: center; margin-bottom: 14px; }
.panel-header h2 { margin: 0; }

@media (max-width: 980px) {
    .hero, .cards-3, .admin-grid { grid-template-columns: 1fr; }
    .result-hero, .topbar, .page-header, .panel-header, .sticky-submit { flex-direction: column; align-items: stretch; }
}
@media (max-width: 720px) {
    .content { width: min(100% - 20px, 1200px); }
    .hero-copy, .hero-card, .card, .panel, .question-card, .result-card { padding: 18px; }
    .form-grid, .option-admin-grid { grid-template-columns: 1fr; }
    .option-row { grid-template-columns: auto auto 1fr; }
    .option-row .pill-group { grid-column: 1 / -1; }
}

.compact-hero { grid-template-columns: 1.05fr .95fr; margin-bottom: 22px; }
.info-panel h2 { margin: 12px 0 10px; }
.dual-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.tag-list { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px; }
.tag {
    display: inline-flex; align-items: center; padding: 9px 12px;
    border-radius: 999px; background: #eef4ff; color: var(--primary);
    border: 1px solid #d5e3ff; font-weight: 700; font-size: .9rem;
}
.status-neutral { background: #eef2f8; color: #5f6c82; }
.practice-feedback {
    display: flex; align-items: center; justify-content: space-between; gap: 16px;
    margin: 0 0 14px; padding: 12px 14px;
    border-radius: 14px; background: #f6f8fc; border: 1px solid #e6ebf3;
}
.practice-feedback small { color: var(--muted); }
.practice-feedback.is-correct { background: #edf9f3; border-color: #bfe4d0; }
.practice-feedback.is-wrong { background: #fff2f4; border-color: #efc2cb; }
.option-row.is-correct {
    border-color: #98d3ba; background: #edf9f3;
}
.option-row.is-wrong-selected {
    border-color: #efb4c0; background: #fff1f4;
}
.option-row.is-missed-correct {
    border-color: #e6c76a; background: #fff8df;
}
code {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    background: #eef3fb; padding: 2px 6px; border-radius: 8px;
}
@media (max-width: 720px) {
    .practice-feedback { align-items: flex-start; flex-direction: column; }
    .dual-actions { grid-template-columns: 1fr; }
}

.practice-progress-card {
    display: flex;
    justify-content: space-between;
    gap: 18px;
    align-items: center;
    padding: 20px 22px;
    background: linear-gradient(180deg, #ffffff 0%, #f6f9ff 100%);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.practice-progress-card h2 {
    margin: 10px 0 8px;
    font-size: 1.2rem;
}
.practice-progress-card p {
    margin: 0;
    color: var(--muted);
}
.practice-progress-meta {
    min-width: 220px;
    text-align: right;
}
.practice-progress-meta strong {
    display: block;
    font-size: 1.1rem;
    margin-bottom: 6px;
}
.practice-progress-meta small {
    color: var(--muted);
}
.practice-step {
    display: none;
}
.practice-step.is-active {
    display: block;
}
.quiz-form-practice {
    gap: 20px;
}
.option-row {
    grid-template-columns: auto auto minmax(0, 1fr) auto;
}
.option-row > * {
    min-width: 0;
}
.option-text,
.question-card h2,
.result-card p,
.result-option span:last-child {
    min-width: 0;
    overflow-wrap: anywhere;
    word-break: break-word;
}
.practice-button-row {
    justify-content: flex-end;
    width: 100%;
}
@media (max-width: 980px) {
    .practice-progress-card,
    .sticky-submit-practice {
        flex-direction: column;
        align-items: stretch;
    }
    .practice-progress-meta {
        min-width: 0;
        text-align: left;
    }
}
@media (max-width: 720px) {
    .option-row {
        grid-template-columns: auto auto minmax(0, 1fr);
    }
    .practice-button-row {
        width: 100%;
        display: grid;
        grid-template-columns: 1fr;
    }
}


.admin-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 18px;
}
.admin-filter-grid {
    align-items: end;
}
.admin-question-list {
    display: grid;
    gap: 16px;
    margin-top: 18px;
}
.admin-question-card {
    display: grid;
    gap: 12px;
}
.admin-question-card-head {
    align-items: start;
}
.admin-question-card-head .badge {
    display: inline-flex;
    margin-bottom: 10px;
}
.admin-question-text,
.admin-question-explanation {
    margin: 0;
    min-width: 0;
    overflow-wrap: anywhere;
    word-break: break-word;
}
.admin-question-meta small {
    color: var(--muted);
}
.inline-form {
    display: inline;
}
.toggle-row {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 14px;
    border-radius: 14px;
    background: var(--panel-soft);
    border: 1px solid var(--line);
}
.toggle-row span {
    margin: 0;
}
@media (max-width: 720px) {
    .admin-toolbar,
    .admin-button-row {
        display: grid;
        grid-template-columns: 1fr;
    }
}

.question-image-wrap,
.result-image-wrap,
.question-image-admin-preview {
    margin: 16px 0 18px;
    padding: 12px;
    border-radius: 18px;
    border: 1px solid #e3e9f3;
    background: #f8fbff;
    overflow: hidden;
}

.question-image,
.question-image-admin-preview img {
    display: block;
    width: auto;
    max-width: 100%;
    height: auto;
    max-height: 320px;
    margin: 0 auto;
    object-fit: contain;
    object-position: center;
    border-radius: 12px;
}

.question-image-admin-preview {
    max-width: 720px;
}

@media (max-width: 980px) {
    .question-image,
    .question-image-admin-preview img {
        max-height: 240px;
    }
}

@media (max-width: 720px) {
    .question-image-wrap,
    .result-image-wrap,
    .question-image-admin-preview {
        margin: 14px 0 16px;
        padding: 10px;
        border-radius: 16px;
    }

    .question-image,
    .question-image-admin-preview img {
        width: auto;
        max-width: 100%;
        height: auto;
        max-height: 180px;
    }
}