:root {
    --bg: #f4f6f8;
    --surface: #ffffff;
    --text: #1b2430;
    --muted: #5b6776;
    --border: #d5dce4;
    --accent: #1f5f8b;
    --accent-text: #ffffff;
    --danger: #b3261e;
    --danger-bg: #fdecea;
    --good: #1e7a3c;
    --warn: #9a6200;
    --radius: 12px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #11161c;
        --surface: #1a2129;
        --text: #e6ebf0;
        --muted: #9aa7b4;
        --border: #2e3843;
        --accent: #5aa6d8;
        --accent-text: #0b1a26;
        --danger: #ffb4ab;
        --danger-bg: #3a1a17;
        --good: #7fd197;
        --warn: #f0c060;
    }
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
}

[hidden] {
    display: none !important;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font: 17px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

h1 {
    font-size: 1.5rem;
    margin: 0 0 16px;
}

h2 {
    font-size: 1.1rem;
    margin: 0 0 8px;
}

p {
    margin: 0 0 8px;
}

a {
    color: var(--accent);
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 8px 16px;
    padding-top: max(8px, env(safe-area-inset-top));
    background: var(--surface);
    border-bottom: 1px solid var(--border);
}

.brand {
    font-weight: 700;
    color: var(--text);
    text-decoration: none;
    min-height: 44px;
    display: flex;
    align-items: center;
}

.topnav {
    display: flex;
    flex-wrap: wrap;
    gap: 0;
}

.topnav a,
.link-button {
    min-height: 44px;
    padding: 0 10px;
    display: flex;
    align-items: center;
    background: none;
    border: 0;
    color: var(--accent);
    font: inherit;
    text-decoration: none;
    cursor: pointer;
}

/* Kis kijelzőn (pl. iPhone SE, 375 px) a négy menüpont így fér el egy sorban; ha mégsem, a menü új sorba törik. */
@media (max-width: 420px) {
    .topbar {
        flex-wrap: wrap;
        gap: 0;
        padding-left: 12px;
        padding-right: 4px;
    }

    .topnav a,
    .topnav .link-button {
        padding: 0 6px;
        font-size: 0.9rem;
    }
}

.container {
    max-width: 640px;
    margin: 0 auto;
    padding: 20px 16px calc(32px + env(safe-area-inset-bottom));
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 16px;
}

.stack > * + * {
    margin-top: 14px;
}

.field {
    display: block;
}

.field > span {
    display: block;
    font-weight: 600;
    margin-bottom: 4px;
}

input,
select,
textarea {
    width: 100%;
    min-height: 44px;
    padding: 10px 12px;
    font: inherit;
    font-size: 17px; /* 16px alatt az iOS Safari ráközelít */
    color: var(--text);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
}

input:focus,
select:focus,
textarea:focus {
    outline: 2px solid var(--accent);
    outline-offset: 1px;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-height: 48px;
    padding: 0 18px;
    font: inherit;
    font-weight: 600;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    text-decoration: none;
    cursor: pointer;
}

textarea.single {
    min-height: 48px;
}

.button.primary {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--accent-text);
}

.button:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

.muted {
    color: var(--muted);
}

.small {
    font-size: 0.9rem;
}

.form-error {
    color: var(--danger);
    background: var(--danger-bg);
    border-radius: 8px;
    padding: 8px 12px;
}

.status-banner {
    position: sticky;
    top: 0;
    z-index: 10;
    padding: 10px 16px;
    background: var(--danger-bg);
    color: var(--danger);
    text-align: center;
}

.status-banner.success {
    background: var(--surface);
    color: var(--accent);
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
}

.lesson-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 44px;
}

.lesson-head a {
    display: flex;
    align-items: center;
    min-height: 44px;
}

.progress-bar {
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    margin-bottom: 16px;
    overflow: hidden;
}

.progress-bar > div {
    height: 100%;
    width: 0;
    background: var(--accent);
    transition: width 0.3s;
}

.task-text {
    font-size: 1.2rem;
    font-weight: 600;
}

textarea {
    resize: vertical;
    min-height: 96px;
}

.answer-text {
    font-size: 1.05rem;
    padding: 8px 12px;
    background: var(--bg);
    border-radius: 8px;
}

.answer-text.good {
    border-left: 4px solid var(--good);
}

.verdict {
    font-weight: 700;
    font-size: 1.1rem;
}

.verdict.good {
    color: var(--good);
}

.verdict.warn {
    color: var(--warn);
}

.verdict.bad {
    color: var(--danger);
}

.error-list {
    margin: 0;
    padding-left: 20px;
}

.error-list li + li {
    margin-top: 4px;
}

.badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 600;
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--muted);
}

.badge.review {
    color: var(--warn);
    border-color: var(--warn);
}

.pattern-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.pattern-list li {
    padding: 10px 0;
    border-top: 1px solid var(--border);
}

.pattern-list li:first-child {
    border-top: 0;
}

.pattern-list .resolved {
    color: var(--good);
}

.button-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.small-button {
    width: auto;
    min-height: 44px;
    font-size: 0.95rem;
}

.vocab-block {
    border-top: 1px solid var(--border);
    padding-top: 12px;
}

.vocab-block > * + * {
    margin-top: 8px;
}

.offer-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.offer-list li {
    padding: 8px 0;
    border-top: 1px solid var(--border);
}

.offer-list li:first-child {
    border-top: 0;
}

.offer-list p {
    margin-bottom: 4px;
}

.inline-form {
    display: flex;
    gap: 8px;
}

.inline-form input {
    flex: 1;
    min-width: 0;
}

.resolved {
    color: var(--good);
}

.danger-link {
    color: var(--danger);
    padding: 0;
}

.setting-group {
    border: 0;
    padding: 0;
    margin: 0;
}

.setting-group legend {
    font-weight: 600;
    padding: 0;
    margin-bottom: 6px;
}

.setting-group .row {
    display: grid;
    gap: 8px;
}

@media (min-width: 480px) {
    .setting-group .row {
        grid-template-columns: 1fr 1fr;
    }
}