/**
 * 拼音练习工具页样式（独立于主站与其他工具页，自包含，无需构建）
 * 手机端优先，电脑端简单支持；暗色模式跟随系统 prefers-color-scheme。
 */

:root {
    color-scheme: light dark;
    --bg: #f4f6fb;
    --panel: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --border: #e5e7eb;
    --accent: #2563eb;
    --accent-soft: #dbeafe;
    --accent-text: #ffffff;
    --shadow: 0 12px 32px rgba(31, 41, 55, 0.10);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0f172a;
        --panel: #1e293b;
        --text: #e5e7eb;
        --muted: #94a3b8;
        --border: #334155;
        --accent: #3b82f6;
        --accent-soft: #1e3a8a;
        --accent-text: #ffffff;
        --shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
    }
}

[hidden] {
    display: none !important;
}

html, body {
    margin: 0;
    padding: 0;
}

.pinyin-page {
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    background: var(--bg);
    color: var(--text);
    font-family: 'Figtree', -apple-system, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    -webkit-tap-highlight-color: transparent;
}

/* 顶栏 */
.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.75rem 1rem;
}

.topbar .brand {
    font-size: 1.05rem;
    font-weight: 700;
}

.topbar h1 {
    margin: 0;
    font-size: 1.05rem;
    font-weight: 700;
}

.topbar .link {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
    padding: 0.35rem 0.6rem;
    border-radius: 0.6rem;
}

.topbar .link:hover {
    background: var(--accent-soft);
}

#status-tip {
    color: var(--muted);
    font-size: 0.85rem;
}

/* 练习页主体 */
.stage {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1.25rem;
    padding: 1rem;
}

.card {
    width: min(28rem, 92vw);
    min-height: 11rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 1.5rem;
    background: var(--panel);
    border-radius: 1.75rem;
    box-shadow: var(--shadow);
}

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

.card-display {
    font-size: clamp(3.5rem, 20vw, 7.5rem);
    font-weight: 700;
    line-height: 1.15;
    word-break: break-all;
    text-align: center;
}

.card.is-swap {
    animation: card-in 0.22s ease;
}

@keyframes card-in {
    from {
        opacity: 0;
        transform: translateY(0.4rem) scale(0.98);
    }
    to {
        opacity: 1;
        transform: none;
    }
}

.hint {
    margin: 0;
    color: var(--muted);
    font-size: 0.9rem;
    text-align: center;
}

.empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    color: var(--muted);
}

/* 底部操作区（手机端拇指易达） */
.actions {
    position: sticky;
    bottom: 0;
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    padding: 1rem;
    padding-bottom: calc(1rem + env(safe-area-inset-bottom));
}

.btn {
    min-height: 3.1rem;
    min-width: 8.5rem;
    padding: 0 1.75rem;
    border: 1px solid transparent;
    border-radius: 9999px;
    font-family: inherit;
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

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

.btn-primary:hover {
    filter: brightness(1.08);
}

.btn-secondary {
    background: var(--panel);
    color: var(--text);
    border-color: var(--border);
}

.btn-secondary:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.btn:focus-visible,
.tone:focus-visible,
.chip input:focus-visible + span,
.group-head input:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* 设置页 */
.settings {
    width: min(36rem, 100%);
    margin: 0 auto;
    padding: 0 1rem 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.panel {
    background: var(--panel);
    border-radius: 1.25rem;
    box-shadow: var(--shadow);
    padding: 1.1rem 1.25rem;
}

.panel h2 {
    margin: 0 0 0.75rem;
    font-size: 1rem;
    font-weight: 700;
}

.note {
    margin: 0.75rem 0 0;
    color: var(--muted);
    font-size: 0.85rem;
    line-height: 1.6;
}

/* 声调选择 */
.tones {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.tone {
    min-height: 2.6rem;
    padding: 0 1.1rem;
    border: 1px solid var(--border);
    border-radius: 9999px;
    background: transparent;
    color: var(--text);
    font-family: inherit;
    font-size: 0.95rem;
    cursor: pointer;
}

.tone[aria-pressed="true"] {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--accent-text);
    font-weight: 600;
}

/* 音节分组 */
.toolbar {
    display: flex;
    gap: 0.6rem;
    margin-bottom: 0.75rem;
}

.toolbar .btn {
    min-height: 2.4rem;
    min-width: 0;
    padding: 0 1.1rem;
    font-size: 0.9rem;
}

.group {
    border-top: 1px solid var(--border);
    padding: 0.65rem 0;
}

.group-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.group-head .count {
    color: var(--muted);
    font-size: 0.85rem;
}

.check {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    min-height: 2.6rem;
}

.check input {
    width: 1.2rem;
    height: 1.2rem;
    accent-color: var(--accent);
}

.group-detail summary {
    color: var(--accent);
    font-size: 0.88rem;
    cursor: pointer;
    padding: 0.25rem 0;
    user-select: none;
}

.chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.65rem 0 0.35rem;
}

.chip {
    cursor: pointer;
}

.chip input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.chip span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.6rem;
    min-height: 2.35rem;
    padding: 0 0.75rem;
    border: 1px solid var(--border);
    border-radius: 0.85rem;
    color: var(--muted);
    font-size: 1rem;
    transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.chip input:checked + span {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--accent-text);
    font-weight: 600;
}

.panel-actions {
    display: flex;
    gap: 0.75rem;
    justify-content: flex-end;
    align-items: center;
}

.panel-actions .btn {
    min-height: 2.8rem;
    min-width: 0;
    padding: 0 1.4rem;
    font-size: 0.95rem;
}

/* 电脑端简单支持 */
@media (min-width: 768px) {
    .card {
        min-height: 14rem;
    }

    .topbar {
        padding: 1rem 1.5rem;
    }
}