:root {
    --green: #183C2B;
    --green-dark: #0F2A1D;
    --gold: #D7A62C;
    --brick: #9E3028;
    --ivory: #F5F0E6;
    --ink: #1E2620;
    --muted: #5C5A4E;
    --line: #DDD3BC;
    --track: #E8E0CC;
    --page: #F5F0E6;
    --card: #FFFDF8;
    --tint: #FBF4DF;
    --good: #183C2B;
    --good-bg: #E3ECE5;
    --good-line: #2F6B4A;
    --bad: #7F2620;
    --bad-bg: #F7E4E1;
    --bad-line: #9E3028;
}

* {
    box-sizing: border-box;
}

body {
    background-color: var(--page);
    color: var(--ink);
    font-family: 'General Sans', system-ui, sans-serif;
    font-size: 1rem;
    line-height: 1.5;
    margin: 0;
    min-height: 100vh;
    padding: 2.5rem 1rem;
}

.card {
    background-color: var(--card);
    border: 1px solid var(--line);
    border-radius: 16px;
    margin: 0 auto;
    max-width: 640px;
    border-top: 4px solid var(--gold);
    padding: 1.5rem 1.75rem 1.75rem;
}

.card-header {
    align-items: baseline;
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem 1rem;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}

h1 {
    color: var(--green);
    font-family: 'General Sans', system-ui, sans-serif;
    font-size: 1.75rem;
    font-weight: 500;
    margin: 0;
}

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

.progress {
    background-color: var(--track);
    border-radius: 3px;
    height: 6px;
    margin-bottom: 1.75rem;
    overflow: hidden;
}

.progress-fill {
    background-color: var(--gold);
    border-radius: 3px;
    height: 100%;
    transition: width 0.3s ease;
    width: 0;
}

h2 {
    font-size: 1.35rem;
    font-weight: 500;
    line-height: 1.35;
    margin: 0 0 1.25rem;
}

.options {
    display: grid;
    gap: 0.75rem;
    grid-template-columns: 1fr 1fr;
}

.option {
    background-color: var(--card);
    border: 1px solid var(--line);
    border-radius: 12px;
    color: var(--ink);
    cursor: pointer;
    font: inherit;
    font-size: 1.05rem;
    min-height: 52px;
    padding: 0.75rem 1rem;
    transition: border-color 0.15s ease, background-color 0.15s ease, transform 0.15s ease;
}

.option:hover:not(:disabled) {
    border-color: var(--gold);
    background-color: var(--tint);
    transform: translateY(-1px);
}

.option:disabled {
    cursor: default;
}

.option.correct {
    background-color: var(--good-bg);
    border: 1.5px solid var(--good-line);
    color: var(--good);
}

.option.correct::before {
    content: '\2713\00a0';
}

.option.incorrect {
    background-color: var(--bad-bg);
    border: 1.5px solid var(--bad-line);
    color: var(--bad);
}

.option.incorrect::before {
    content: '\2717\00a0';
}

.answer-row {
    display: flex;
    gap: 0.75rem;
}

input[type="text"] {
    background-color: var(--card);
    border: 1px solid var(--line);
    border-radius: 12px;
    color: var(--ink);
    flex: 1;
    font: inherit;
    font-size: 1.05rem;
    min-height: 52px;
    min-width: 0;
    padding: 0.75rem 1rem;
    transition: border-color 0.15s ease, background-color 0.15s ease;
}

input[type="text"]:hover:not(:disabled) {
    border-color: var(--green);
}

input[type="text"].correct {
    background-color: var(--good-bg);
    border: 1.5px solid var(--good-line);
    color: var(--good);
}

input[type="text"].incorrect {
    background-color: var(--bad-bg);
    border: 1.5px solid var(--bad-line);
    color: var(--bad);
}

.check,
.next,
.restart {
    background-color: var(--green);
    border: 1px solid var(--green);
    border-radius: 12px;
    color: #fff;
    cursor: pointer;
    font: inherit;
    font-weight: 500;
    min-height: 52px;
    padding: 0.75rem 1.4rem;
    transition: background-color 0.15s ease, transform 0.1s ease;
}

.check:hover,
.next:hover,
.restart:hover {
    background-color: var(--green-dark);
}

.check:active,
.next:active,
.restart:active {
    transform: scale(0.98);
}

.check:disabled {
    background-color: #9FB3A6;
    border-color: #9FB3A6;
    cursor: default;
}

.next {
    margin-top: 0.5rem;
}

.feedback {
    font-size: 0.95rem;
    margin: 0.9rem 0 0;
    min-height: 1.5rem;
}

.feedback.correct {
    color: var(--good);
}

.feedback.incorrect,
.feedback.warning {
    color: var(--bad);
}

.explanation {
    background-color: var(--tint);
    border-left: 4px solid var(--gold);
    border-radius: 0 10px 10px 0;
    color: var(--ink);
    font-size: 0.95rem;
    margin-top: 0.75rem;
    padding: 0.75rem 1rem;
}

.explanation strong {
    color: var(--green);
}

.results {
    padding: 0.5rem 0 0.25rem;
    text-align: center;
}

.score {
    font-family: 'General Sans', system-ui, sans-serif;
    font-size: 2.5rem;
    font-weight: 500;
    margin: 0;
}

.score-note {
    color: var(--muted);
    margin: 0.25rem 0 1.5rem;
}

button:focus-visible,
input:focus-visible {
    outline: 3px solid rgba(24, 60, 43, 0.6);
    outline-offset: 2px;
}

@media (max-width: 480px) {
    .card {
        padding: 1.25rem 1.1rem 1.5rem;
    }

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

    .answer-row {
        flex-direction: column;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
    }
}