:root {
    --bg: #f2f5f9;
    --card-bg: #ffffff;
    --text: #1f2a3d;
    --muted: #5c697c;
    --accent: #1f7a8c;
    --accent-light: #cde8ef;
    --danger: #c0392b;
    --success: #2a9d4b;
    --border-radius: 18px;
    --shadow: 0 16px 36px rgba(22, 33, 62, 0.18);
    color-scheme: light;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Inter", "Segoe UI", sans-serif;
    background: linear-gradient(160deg, #dde7f2 0%, #f8fbff 100%);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 24px 12px 48px;
}

.app {
    width: min(960px, 100%);
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.app__header {\n    display: flex;\n    flex-direction: column;\n    gap: 16px;\n}\n

.app__top {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.app__actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.locale-select {
    border: 1px solid rgba(92, 105, 124, 0.35);
    border-radius: 999px;
    padding: 8px 16px;
    font-size: 0.95rem;
    font-weight: 600;
    background: #ffffff;
    color: var(--text);
    cursor: pointer;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.locale-select:focus-visible {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(31, 122, 140, 0.15);
}

.locale-select option {
    font-weight: 500;
}
.app__title {
    margin: 0;
    font-size: clamp(1.8rem, 3vw, 2.6rem);
    letter-spacing: -0.02em;
}

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

.card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    display: grid;
    grid-template-columns: minmax(0, 1fr);
}

.card__image-wrapper {
    background: #eef4fb;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 8px;
}

.card__image {
    width: 100%;
    height: auto;
    max-height: 320px;
    object-fit: contain;
}

.card__body {
    padding: clamp(18px, 4vw, 32px);
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.card__category {
    margin: 0;
    font-size: 0.85rem;
    color: var(--muted);
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.card__question {
    margin: 0;
    font-size: clamp(1.2rem, 3.5vw, 1.8rem);
    line-height: 1.4;
}

.options {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 12px;
}

.options__item {
    width: 100%;
}

.option-btn {
    width: 100%;
    border: 1px solid transparent;
    border-radius: 14px;
    padding: clamp(14px, 3vw, 18px);
    font-size: 1rem;
    font-weight: 500;
    text-align: left;
    background: #f4f9fc;
    color: var(--text);
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.option-btn:hover,
.option-btn:focus-visible {
    transform: translateY(-2px);
    box-shadow: 0 8px 18px rgba(22, 33, 62, 0.12);
    outline: none;
    border-color: var(--accent);
}

.option-btn[disabled] {
    cursor: not-allowed;
    opacity: 0.8;
    transform: none;
    box-shadow: none;
}

.option-btn.option-btn--selected {
    border-color: var(--accent);
    background: var(--accent-light);
}

.option-btn.option-btn--correct {
    border-color: var(--success);
    background: #e5f6ec;
}

.option-btn.option-btn--incorrect {
    border-color: var(--danger);
    background: #fdecea;
}

.feedback {
    border-radius: 12px;
    padding: 16px;
    background: #eef5ff;
    color: var(--text);
}

.feedback[data-state="correct"] {
    background: #e5f6ec;
    color: var(--success);
}

.feedback[data-state="incorrect"] {
    background: #fdecea;
    color: var(--danger);
}

.feedback__message {
    margin: 0 0 8px;
    font-weight: 600;
}

.feedback__hint {
    color: var(--text);
    font-size: 0.95rem;
    line-height: 1.45;
    white-space: pre-wrap;
}

.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: space-between;
    margin-top: 8px;
}

.btn {
    border-radius: 999px;
    border: none;
    padding: 12px 20px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn:hover,
.btn:focus-visible {
    transform: translateY(-1px);
    box-shadow: 0 6px 14px rgba(22, 33, 62, 0.18);
    outline: none;
}

.btn[disabled] {
    cursor: not-allowed;
    opacity: 0.6;
    transform: none;
    box-shadow: none;
}

.btn--primary {
    background: var(--accent);
    color: #ffffff;
}

.btn--secondary {
    background: #ffffff;
    color: var(--accent);
    border: 1px solid rgba(31, 122, 140, 0.35);
}

.btn--ghost {
    background: transparent;
    color: var(--muted);
    border: 1px solid rgba(92, 105, 124, 0.35);
}

.app__footer {
    display: flex;
    justify-content: center;
}

.toast {
    position: fixed;
    left: 50%;
    bottom: 24px;
    transform: translateX(-50%);
    background: rgba(31, 122, 140, 0.95);
    color: #ffffff;
    padding: 10px 20px;
    border-radius: 999px;
    font-size: 0.9rem;
    box-shadow: 0 12px 24px rgba(22, 33, 62, 0.25);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
}

.toast.toast--visible {
    opacity: 1;
}

@media (min-width: 680px) {
    .card {
        grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    }

    .card__image-wrapper {
        padding: 16px;
    }
}

@media (max-width: 420px) {
    body {
        padding: 16px 8px 32px;
    }

    .controls {
        flex-direction: column;
        align-items: stretch;
    }
}

@media (max-width: 600px) {
    .app__top {
        flex-direction: column;
        align-items: stretch;
        gap: 10px;
    }

    .app__actions {
        justify-content: flex-start;
    }
}
/* Mobile layout fixes for iOS/Safari and small screens */
html, body { overflow-x: hidden; }
.app { min-width: 0; }
.app__actions { flex-wrap: wrap; row-gap: 8px; }
.app__actions .locale-select { max-width: 100%; min-width: 0; }

/* Make controls stack cleanly on narrow viewports */
@media (max-width: 640px) {
  .app__actions { width: 100%; }
  .app__actions .app__label,
  .app__actions .locale-select { flex: 1 1 100%; }
  .locale-select { width: 100%; }
}