:root {
    --bg: #f4f7f2;
    --panel: #ffffff;
    --panel-alt: #eef4eb;
    --text: #132018;
    --muted: #5e6d61;
    --border: #cfd9d1;
    --primary: #1f6f4a;
    --primary-dark: #175437;
    --danger: #b73a3a;
    --danger-soft: #fce9e9;
    --success: #237a47;
    --success-soft: #e8f5ec;
    --neutral: #6d7570;
    --neutral-soft: #eceeed;
    --shadow: 0 12px 30px rgba(19, 32, 24, 0.08);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background:
        radial-gradient(circle at top left, rgba(31, 111, 74, 0.12), transparent 28%),
        linear-gradient(180deg, #f7fbf6 0%, var(--bg) 100%);
    color: var(--text);
    font-size: 16px;
    line-height: 1.5;
}

.container {
    width: min(100%, 600px);
    margin: 0 auto;
    padding: 20px 16px 40px;
}

.page-header {
    margin-bottom: 20px;
}

.page-header.compact {
    margin-bottom: 16px;
}

.eyebrow {
    margin: 0 0 8px;
    color: var(--primary);
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

h1,
h2,
h3,
legend,
label,
p {
    overflow-wrap: break-word;
}

h1 {
    margin: 0 0 8px;
    font-size: 2rem;
    line-height: 1.1;
}

h2 {
    margin: 0 0 12px;
    font-size: 1.35rem;
}

h3 {
    margin: 0 0 8px;
    font-size: 1.05rem;
}

p {
    margin: 0;
}

.panel {
    margin-bottom: 18px;
    padding: 18px;
    border: 1px solid var(--border);
    border-radius: 18px;
    background: var(--panel);
    box-shadow: var(--shadow);
}

.stack-sm > * + * {
    margin-top: 10px;
}

.stack-lg > * + * {
    margin-top: 18px;
}

.choice-grid {
    display: grid;
    gap: 14px;
}

.choice-group {
    margin: 0;
    padding: 14px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: var(--panel-alt);
}

.choice-group legend {
    padding: 0 6px;
    font-weight: 700;
}

.choice-option {
    display: flex;
    align-items: center;
    gap: 12px;
    min-height: 48px;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: #fff;
    cursor: pointer;
}

.choice-option + .choice-option {
    margin-top: 10px;
}

.choice-option input {
    flex: 0 0 auto;
}

.text-input {
    width: 100%;
    min-height: 48px;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: 12px;
    font-size: 16px;
}

.button-primary,
.button-secondary {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    min-height: 48px;
    padding: 12px 18px;
    border-radius: 14px;
    border: none;
    text-decoration: none;
    font-weight: 700;
    font-size: 16px;
}

.button-primary {
    background: var(--primary);
    color: #fff;
}

.button-primary:hover,
.button-primary:focus-visible {
    background: var(--primary-dark);
}

.button-secondary {
    background: #fff;
    color: var(--primary);
    border: 1px solid var(--primary);
}

.notice {
    margin-bottom: 16px;
    padding: 14px 16px;
    border-radius: 14px;
    border: 1px solid var(--border);
}

.notice-error {
    background: var(--danger-soft);
    border-color: #f2b2b2;
    color: #7b1f1f;
}

.notice-warning {
    background: #fff4db;
    border-color: #f1d48c;
    color: #7e5d14;
}

.notice-info {
    background: #eaf3ff;
    border-color: #b7d2f4;
    color: #1d4e8a;
}

.feedback-correct {
    background: var(--success-soft);
    border-color: #b8e0c7;
}

.feedback-wrong {
    background: var(--danger-soft);
    border-color: #f0bcbc;
}

.progress {
    width: 100%;
    height: 10px;
    background: #d9e6dc;
    border-radius: 999px;
    overflow: hidden;
    margin-top: 12px;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, #3b8f63 0%, #1f6f4a 100%);
}

.question-card {
    display: grid;
    gap: 12px;
}

.question-lead,
.question-letter {
    font-size: 1.5rem;
    font-weight: 700;
}

.question-letter {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 110px;
    border-radius: 18px;
    background: linear-gradient(135deg, #eff6ec 0%, #dde9de 100%);
}

.question-image,
.image-placeholder {
    width: 100%;
    max-width: 220px;
    min-height: 180px;
    border-radius: 18px;
    border: 1px dashed var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    background: #fff;
}

.image-placeholder {
    padding: 16px;
    color: var(--muted);
}

.hint {
    color: var(--muted);
    font-size: 0.95rem;
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.metric-label {
    display: block;
    color: var(--muted);
    font-size: 0.9rem;
}

.metric-value {
    display: block;
    margin-top: 4px;
    font-size: 1.3rem;
}

.badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 10px 14px;
    border-radius: 999px;
    font-weight: 700;
}

.badge-success {
    background: var(--success);
    color: #fff;
}

.badge-danger {
    background: var(--danger);
    color: #fff;
}

.badge-neutral {
    background: var(--neutral-soft);
    color: var(--neutral);
}

.review-card {
    padding: 14px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: #fafcf9;
}

ul {
    margin: 0;
    padding-left: 18px;
}

.page-footer {
    margin-top: 40px;
    padding: 20px 0;
    border-top: 1px solid var(--border);
    text-align: center;
    background: transparent;
}

.page-footer p {
    margin: 0;
    color: var(--muted);
    font-size: 0.9rem;
}

.page-footer a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.page-footer a:hover,
.page-footer a:focus-visible {
    text-decoration: underline;
}

@media (max-width: 520px) {
    .container {
        padding: 16px 12px 32px;
    }

    h1 {
        font-size: 1.7rem;
    }

    .panel {
        padding: 16px;
        border-radius: 16px;
    }

    .result-grid {
        grid-template-columns: 1fr;
    }
}