/* ═══════════════════════════════════════════════════════════════
   小学打字软件 v2.0 — 样式表
   响应式 · 卡片设计 · 虚拟键盘
   ═══════════════════════════════════════════════════════════════ */

/* ── CSS 变量 ────────────────────────────────────────────── */
:root {
    --primary: #4A90D9;
    --primary-light: #6BA5E7;
    --primary-dark: #3570B0;
    --success: #34C759;
    --danger: #FF3B30;
    --warning: #FF9500;
    --bg: #F2F5F9;
    --card-bg: #FFFFFF;
    --text: #2C3E50;
    --text-secondary: #7F8C8D;
    --border: #E1E8ED;
    --shadow: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-lg: 0 4px 16px rgba(0,0,0,0.12);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.2s ease;
}

/* ── 基础重置 ────────────────────────────────────────────── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Microsoft YaHei", "Helvetica Neue", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

/* ── 头部 ────────────────────────────────────────────────── */
.app-header {
    background: linear-gradient(135deg, #4A90D9 0%, #6C5CE7 100%);
    color: white;
    padding: 16px 24px;
    box-shadow: 0 2px 12px rgba(74, 144, 217, 0.3);
    position: sticky;
    top: 0;
    z-index: 100;
}

.app-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 12px;
    text-align: center;
}

.tab-nav {
    display: flex;
    gap: 8px;
    justify-content: center;
    flex-wrap: wrap;
}

.tab-btn {
    background: rgba(255,255,255,0.2);
    color: white;
    border: 2px solid transparent;
    padding: 8px 20px;
    border-radius: 24px;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all var(--transition);
    font-weight: 500;
}

.tab-btn:hover {
    background: rgba(255,255,255,0.35);
}

.tab-btn.active {
    background: white;
    color: #4A90D9;
    border-color: white;
    font-weight: 600;
}

/* ── 主内容区 ────────────────────────────────────────────── */
.app-main {
    max-width: 960px;
    margin: 0 auto;
    padding: 20px 20px 200px;  /* 底部留空间给虚拟键盘 */
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* ── 选择器行 ────────────────────────────────────────────── */
.selector-row {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: flex-end;
    margin-bottom: 16px;
}

.selector-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.selector-group label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

select {
    padding: 10px 14px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    background: var(--card-bg);
    color: var(--text);
    cursor: pointer;
    min-width: 120px;
    transition: border-color var(--transition);
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%237F8C8D' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 32px;
}

select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(74,144,217,0.15);
}

/* ── 设置行 ────────────────────────────────────────────── */
.settings-row {
    display: flex;
    gap: 16px;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 20px;
    padding: 12px 16px;
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.toggle-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.95rem;
}

.toggle-label input[type="checkbox"] {
    width: 20px;
    height: 20px;
    accent-color: var(--primary);
}

.hint-after-group {
    display: flex;
    align-items: center;
    gap: 6px;
}

.hint-after-label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    white-space: nowrap;
}

.hint-after-group select {
    min-width: 100px;
}

/* ── 按钮 ────────────────────────────────────────────────── */
.btn {
    padding: 10px 24px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(74,144,217,0.35);
}

.btn-outline {
    background: white;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-outline:hover {
    background: #EEF5FC;
}

.btn-danger {
    background: var(--danger);
    color: white;
}

.btn-danger:hover {
    background: #D63029;
    transform: translateY(-1px);
}

.btn-danger-outline {
    background: white;
    color: var(--danger);
    border: 2px solid var(--danger);
}

.btn-danger-outline:hover {
    background: #FFF0EF;
}

.btn-sm {
    padding: 6px 14px;
    font-size: 0.82rem;
}

/* ── 打字区域 ────────────────────────────────────────────── */
.typing-area {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 28px 24px;
    box-shadow: var(--shadow-lg);
    text-align: center;
    margin-bottom: 200px;  /* 为底部虚拟键盘留出空间 */
}

/* 进度条 */
.progress-bar-wrap {
    height: 8px;
    background: var(--border);
    border-radius: 4px;
    margin-bottom: 20px;
    position: relative;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, #4A90D9, #6C5CE7);
    border-radius: 4px;
    transition: width 0.3s ease;
    width: 0%;
}

.progress-text {
    position: absolute;
    right: 0;
    top: -22px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 600;
}

/* 字词显示 */
.word-display {
    margin: 24px 0;
}

.word-char {
    font-size: 4rem;
    font-weight: 800;
    color: var(--text);
    letter-spacing: 4px;
    line-height: 1.2;
}

.word-hint {
    font-size: 1.5rem;
    color: var(--primary);
    font-weight: 500;
    margin-top: 8px;
    min-height: 36px;
    letter-spacing: 2px;
}

.word-breakdown {
    font-size: 1.1rem;
    color: #E67E22;
    font-weight: 600;
    letter-spacing: 3px;
    min-height: 28px;
    margin-top: 4px;
}

/* 输入显示 */
.input-display {
    font-size: 2rem;
    font-family: "SF Mono", "Fira Code", "Consolas", monospace;
    margin: 16px 0;
    min-height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
}

.input-correct {
    color: var(--success);
    font-weight: 700;
}

.input-cursor {
    color: var(--primary);
    font-weight: 700;
    animation: blink 1s infinite;
    border-bottom: 3px solid var(--primary);
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0.3; }
}

.input-remaining {
    color: #B0BEC5;
}

/* 实时统计 */
.live-stats {
    display: flex;
    gap: 24px;
    justify-content: center;
    flex-wrap: wrap;
    margin: 16px 0;
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.live-stats span {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* 操作按钮 */
.action-buttons {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 16px;
}

/* ── 结果面板 ────────────────────────────────────────────── */
.result-panel {
    animation: fadeInUp 0.4s ease;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.result-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 32px 24px;
    box-shadow: var(--shadow-lg);
    text-align: center;
    max-width: 500px;
    margin: 0 auto 160px;  /* 底部留空间给虚拟键盘 */
}

.result-card h2 {
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.result-stars {
    font-size: 2.5rem;
    margin: 12px 0 20px;
    letter-spacing: 4px;
}

.result-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 24px;
}

.result-stat {
    padding: 12px;
    background: var(--bg);
    border-radius: var(--radius-sm);
}

.result-stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.result-stat-label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 2px;
}

.result-actions {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ── 闯关地图 ────────────────────────────────────────────── */
.challenge-map {
    margin-top: 16px;
}

.challenge-grade {
    margin-bottom: 20px;
}

.challenge-grade h3 {
    font-size: 1.2rem;
    color: var(--primary-dark);
    border-bottom: 2px solid var(--primary-light);
    padding-bottom: 6px;
    margin-bottom: 10px;
}

.challenge-semester h4 {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.challenge-levels {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 10px;
    margin-bottom: 16px;
}

.challenge-level {
    background: var(--card-bg);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 12px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition);
    position: relative;
}

.challenge-level:hover:not(.locked) {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.challenge-level.completed {
    border-color: var(--success);
    background: #F0FFF4;
}

.challenge-level.locked {
    opacity: 0.5;
    cursor: not-allowed;
    background: #F8F9FA;
}

.level-name {
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 6px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.level-stars {
    font-size: 0.9rem;
    letter-spacing: 2px;
}

.level-lock {
    position: absolute;
    top: 6px;
    right: 8px;
    font-size: 0.9rem;
}

.star-filled { opacity: 1; }
.star-empty { opacity: 0.3; }

/* ── 统计卡片 ────────────────────────────────────────────── */
.stats-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 12px;
    margin-bottom: 20px;
}

.stat-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 16px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: transform var(--transition);
}

.stat-card:hover {
    transform: translateY(-2px);
}

.stat-card-icon {
    font-size: 1.5rem;
    margin-bottom: 4px;
}

.stat-card-value {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--primary);
}

.stat-card-label {
    font-size: 0.78rem;
    color: var(--text-secondary);
    margin-top: 2px;
}

/* ── 历史表格 ────────────────────────────────────────────── */
.table-wrap {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow-x: auto;
    margin-bottom: 20px;
}

.history-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.history-table th {
    background: var(--bg);
    padding: 10px 12px;
    text-align: left;
    font-weight: 600;
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 2px solid var(--border);
    white-space: nowrap;
}

.history-table td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
}

.history-table tr:hover td {
    background: #F8FAFD;
}

.empty-cell {
    text-align: center;
    color: var(--text-secondary);
    padding: 24px !important;
}

/* ── 错词本 ──────────────────────────────────────────────── */
.error-words-section {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 16px 20px;
}

.section-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.section-header h3 {
    font-size: 1.05rem;
    margin-right: auto;
}

.error-words-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.error-word-item {
    display: flex;
    align-items: center;
    gap: 6px;
    background: #FFF5F5;
    border: 1px solid #FFD5D5;
    border-radius: 20px;
    padding: 5px 12px;
    font-size: 0.85rem;
}

.error-word-char {
    font-weight: 700;
    color: var(--danger);
}

.error-word-arrow {
    color: #CCC;
}

.error-word-answer {
    color: var(--primary);
    font-family: "SF Mono", "Consolas", monospace;
}

.error-word-subject {
    color: var(--text-secondary);
    font-size: 0.75rem;
}

.error-word-count {
    color: var(--warning);
    font-weight: 600;
    font-size: 0.75rem;
}

/* ── 虚拟键盘 ────────────────────────────────────────────── */
.virtual-keyboard {
    background: #1E293B;
    border-radius: var(--radius) var(--radius) 0 0;
    padding: 12px 8px 16px;
    position: fixed;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 900px;
    z-index: 50;
    box-shadow: 0 -4px 20px rgba(0,0,0,0.25);
}

.keyboard-row {
    display: flex;
    justify-content: center;
    gap: 3px;
    margin-bottom: 4px;
}

.kb-key {
    width: 34px;
    height: 40px;
    background: #334155;
    color: #E2E8F0;
    border-radius: 5px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    transition: all 0.1s ease;
    border: 1px solid #475569;
    cursor: default;
    user-select: none;
}

/* 指法分区颜色 */
.kb-key.pinky-l  { background: #8B5CF6; }  /* 左手小指 - 紫色 */
.kb-key.ring-l   { background: #3B82F6; }  /* 左手无名指 - 蓝色 */
.kb-key.middle-l { background: #06B6D4; }  /* 左手中指 - 青色 */
.kb-key.index-l  { background: #10B981; }  /* 左手食指 - 绿色 */
.kb-key.index-r  { background: #F59E0B; }  /* 右手食指 - 橙色 */
.kb-key.middle-r { background: #EF4444; }  /* 右手中指 - 红色 */
.kb-key.ring-r   { background: #EC4899; }  /* 右手无名指 - 粉色 */
.kb-key.pinky-r  { background: #8B5CF6; }  /* 右手小指 - 紫色 */

/* 按键反馈 */
.kb-key.kb-correct {
    background: #22C55E !important;
    transform: scale(0.92);
    box-shadow: 0 0 12px rgba(34,197,94,0.6);
}

.kb-key.kb-error {
    background: #EF4444 !important;
    animation: shake 0.3s ease;
    box-shadow: 0 0 12px rgba(239,68,68,0.6);
}

/* 键盘提示（下一个要按的键）- 超级显眼版 */
.kb-key.kb-hint {
    background: #FFD700 !important;
    color: #1E293B !important;
    font-weight: 900;
    border: 3px solid #FF6B00 !important;
    box-shadow: 0 0 20px 8px rgba(255, 107, 0, 0.9), 0 0 40px 12px rgba(255, 215, 0, 0.5);
    animation: hintPulse 0.6s ease-in-out infinite;
    z-index: 10;
    position: relative;
    transform-origin: center;
}

@keyframes hintPulse {
    0%, 100% { 
        box-shadow: 0 0 15px 4px rgba(255, 107, 0, 0.7), 0 0 30px 8px rgba(255, 215, 0, 0.4); 
        transform: scale(1); 
    }
    50% { 
        box-shadow: 0 0 30px 12px rgba(255, 107, 0, 1), 0 0 60px 20px rgba(255, 215, 0, 0.8); 
        transform: scale(1.2); 
    }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-3px); }
    75% { transform: translateX(3px); }
}

/* ── 初始提示 ────────────────────────────────────────────── */
.start-hint {
    text-align: center;
    padding: 48px 24px;
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.start-hint-icon {
    font-size: 3rem;
    margin-bottom: 12px;
}

.start-hint p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.start-hint strong {
    color: var(--primary);
}

/* ── Toast 提示 ──────────────────────────────────────────── */
.toast {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(-120px);
    background: #2C3E50;
    color: white;
    padding: 12px 24px;
    border-radius: 24px;
    font-weight: 600;
    font-size: 0.9rem;
    z-index: 200;
    transition: transform 0.3s ease;
    box-shadow: 0 4px 16px rgba(0,0,0,0.25);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

/* ── 弹窗 ────────────────────────────────────────────────── */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.45);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 300;
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-box {
    background: white;
    border-radius: var(--radius);
    padding: 28px 24px;
    max-width: 400px;
    width: 90%;
    text-align: center;
    box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}

.modal-box p {
    font-size: 1rem;
    margin-bottom: 20px;
    line-height: 1.6;
}

.modal-actions {
    display: flex;
    gap: 10px;
    justify-content: center;
}

/* ── 响应式 ──────────────────────────────────────────────── */
@media (max-width: 640px) {
    .app-title {
        font-size: 1.2rem;
    }

    .tab-btn {
        padding: 6px 14px;
        font-size: 0.82rem;
    }

    .word-char {
        font-size: 2.8rem;
    }

    .word-hint {
        font-size: 1.2rem;
    }

    .input-display {
        font-size: 1.4rem;
    }

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

    .stats-cards {
        grid-template-columns: repeat(2, 1fr);
    }

    .challenge-levels {
        grid-template-columns: repeat(2, 1fr);
    }

    .kb-key {
        width: 26px;
        height: 34px;
        font-size: 0.65rem;
    }

    .virtual-keyboard {
        padding: 8px 4px 12px;
    }

    .keyboard-row {
        gap: 2px;
    }

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

    select {
        width: 100%;
    }
}

@media (min-width: 641px) and (max-width: 1024px) {
    .kb-key {
        width: 30px;
        height: 36px;
        font-size: 0.72rem;
    }
}