/* ============================================
   9×9乘法练习工具 - 样式文件
   ============================================ */

/* CSS 变量 - 默认主题（黑白简洁） */
:root {
    --bg-primary: #FFFFFF;
    --bg-secondary: #F5F5F5;
    --text-primary: #1A1A1A;
    --text-secondary: #666666;
    --accent: #333333;
    --border: #E0E0E0;
    --correct: #22C55E;
    --wrong: #EF4444;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.12);
}

/* 粉白可爱萌风 */
[data-theme="cute"] {
    --bg-primary: #FFF5F8;
    --bg-secondary: #FFE4EC;
    --text-primary: #4A3F44;
    --text-secondary: #8B7B82;
    --accent: #FF6B9D;
    --border: #FFD4E0;
    --shadow: 0 2px 8px rgba(255, 107, 157, 0.15);
    --shadow-hover: 0 4px 12px rgba(255, 107, 157, 0.25);
}

/* 清爽绿白风 */
[data-theme="fresh"] {
    --bg-primary: #F5FFF5;
    --bg-secondary: #E8F5E8;
    --text-primary: #2D4A2D;
    --text-secondary: #6B8B6B;
    --accent: #4ADE80;
    --border: #C8E8C8;
    --shadow: 0 2px 8px rgba(74, 222, 128, 0.15);
    --shadow-hover: 0 4px 12px rgba(74, 222, 128, 0.25);
}

/* 小孩哥蓝白风 */
[data-theme="cool"] {
    --bg-primary: #F0F8FF;
    --bg-secondary: #E0F0FF;
    --text-primary: #1E3A5F;
    --text-secondary: #5B7BA1;
    --accent: #3B82F6;
    --border: #C8E0FF;
    --shadow: 0 2px 8px rgba(59, 130, 246, 0.15);
    --shadow-hover: 0 4px 12px rgba(59, 130, 246, 0.25);
}

/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    transition: background-color 0.3s, color 0.3s;
}

/* 头部导航 */
.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
}

.nav {
    display: flex;
    gap: 8px;
}

.nav-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s;
}

.nav-btn:hover {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

/* 主内容区域 */
.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px;
    min-height: calc(100vh - 140px);
}

.page {
    display: none;
}

.page.active {
    display: block;
}

/* 首页 */
.home-container {
    text-align: center;
}

.home-title {
    font-size: 24px;
    margin-bottom: 32px;
    color: var(--text-primary);
}

.mode-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}

.mode-card {
    background: var(--bg-secondary);
    border: 2px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    cursor: pointer;
    transition: all 0.2s;
}

.mode-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: var(--accent);
}

.mode-icon {
    font-size: 48px;
    margin-bottom: 12px;
}

.mode-card h3 {
    font-size: 18px;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.mode-card p {
    font-size: 14px;
    color: var(--text-secondary);
}

.question-count-selector {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-secondary);
    padding: 12px 24px;
    border-radius: 8px;
}

.question-count-selector label {
    font-size: 16px;
    color: var(--text-primary);
}

.question-count-selector select {
    padding: 8px 16px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
}

/* 练习页面 */
.practice-container {
    max-width: 800px;
    margin: 0 auto;
}

.practice-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.practice-header h2 {
    font-size: 20px;
    color: var(--text-primary);
}

.practice-info {
    display: flex;
    gap: 16px;
    font-size: 14px;
    color: var(--text-secondary);
}

.question-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 24px;
}

.question-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
}

.question-number {
    font-size: 14px;
    color: var(--text-secondary);
    min-width: 40px;
}

.question-text {
    font-size: 24px;
    font-family: "Geist Mono", monospace;
    color: var(--text-primary);
    flex: 1;
}

.question-input {
    width: 100px;
    padding: 12px;
    font-size: 20px;
    text-align: center;
    border: 2px solid var(--border);
    border-radius: 8px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: "Geist Mono", monospace;
}

.question-input:focus {
    outline: none;
    border-color: var(--accent);
}

.question-input.correct {
    border-color: var(--correct);
    background: rgba(34, 197, 94, 0.1);
}

.question-input.wrong {
    border-color: var(--wrong);
    background: rgba(239, 68, 68, 0.1);
}

.question-mark {
    font-size: 32px;
    min-width: 40px;
    text-align: center;
    font-weight: bold;
    opacity: 0;
    transform: scale(0);
    transition: all 0.3s ease-out;
}

.question-mark.show {
    opacity: 1;
    transform: scale(1);
}

.question-mark.correct {
    color: var(--correct);
    text-shadow: 0 0 10px rgba(34, 197, 94, 0.5);
}

.question-mark.wrong {
    color: var(--wrong);
    text-shadow: 0 0 10px rgba(239, 68, 68, 0.5);
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.question-answer {
    font-size: 16px;
    color: var(--text-secondary);
    margin-left: 8px;
}

.practice-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
}

/* 按钮样式 */
.btn {
    padding: 12px 24px;
    font-size: 16px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
}

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

.btn-primary:hover {
    opacity: 0.9;
    transform: scale(0.98);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

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

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

.btn-danger:hover {
    opacity: 0.9;
}

/* 结果页面 */
.result-container {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.result-title {
    font-size: 28px;
    margin-bottom: 32px;
    color: var(--text-primary);
}

.result-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-bottom: 32px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.stat-value {
    font-size: 32px;
    font-weight: 600;
    color: var(--accent);
}

.result-message {
    font-size: 18px;
    color: var(--text-primary);
    margin-bottom: 32px;
    padding: 16px;
    background: var(--bg-secondary);
    border-radius: 12px;
}

.result-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
}

/* 错题本页面 */
.wrong-container, .history-container {
    max-width: 800px;
    margin: 0 auto;
}

.wrong-container h2, .history-container h2 {
    font-size: 24px;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.wrong-filter {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 8px 20px;
    border: 2px solid var(--border);
    background: var(--bg-secondary);
    border-radius: 20px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-primary);
}

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

.filter-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

.wrong-list, .history-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 24px;
}

.wrong-item, .history-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
}

.wrong-item-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.wrong-question {
    font-size: 20px;
    font-family: "Geist Mono", monospace;
    color: var(--text-primary);
}

.wrong-answers {
    display: flex;
    gap: 16px;
    font-size: 14px;
}

.wrong-your-answer {
    color: var(--wrong);
}

.wrong-correct-answer {
    color: var(--correct);
}

.history-item-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.history-mode {
    font-size: 16px;
    color: var(--text-primary);
    font-weight: 500;
}

.history-stats {
    display: flex;
    gap: 16px;
    font-size: 14px;
    color: var(--text-secondary);
}

.history-date {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 8px;
}

.empty-state {
    text-align: center;
    padding: 48px;
    color: var(--text-secondary);
}

.wrong-actions, .history-actions {
    display: flex;
    justify-content: center;
}

/* 设置页面 */
.settings-container {
    max-width: 600px;
    margin: 0 auto;
}

.settings-container h2 {
    font-size: 24px;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.setting-group {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
}

.setting-group h3 {
    font-size: 16px;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.theme-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.theme-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 12px;
    border: 2px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

.theme-card:hover {
    border-color: var(--accent);
}

.theme-card.active {
    border-color: var(--accent);
    background: var(--bg-primary);
}

.theme-preview {
    width: 60px;
    height: 40px;
    border-radius: 6px;
}

.theme-minimal {
    background: linear-gradient(135deg, #FFFFFF 50%, #F5F5F5 50%);
}

.theme-cute {
    background: linear-gradient(135deg, #FFF5F8 50%, #FFE4EC 50%);
}

.theme-fresh {
    background: linear-gradient(135deg, #F5FFF5 50%, #E8F5E8 50%);
}

.theme-cool {
    background: linear-gradient(135deg, #F0F8FF 50%, #E0F0FF 50%);
}

.theme-card span {
    font-size: 14px;
    color: var(--text-primary);
}

.setting-item {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
}

.setting-item input {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.setting-item span {
    font-size: 16px;
    color: var(--text-primary);
}

/* Toast 提示 */
.toast {
    position: fixed;
    top: 80px;
    left: 50%;
    transform: translateX(-50%) translateY(-20px);
    background: var(--text-primary);
    color: var(--bg-primary);
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 14px;
    opacity: 0;
    transition: all 0.3s;
    pointer-events: none;
    z-index: 1000;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 12px;
    }

    .nav {
        flex-wrap: wrap;
        justify-content: center;
    }

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

    .result-stats {
        flex-direction: column;
        gap: 16px;
    }

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

    .practice-header {
        flex-direction: column;
        gap: 8px;
        align-items: flex-start;
    }

    .question-item {
        flex-wrap: wrap;
    }

    .question-text {
        font-size: 20px;
    }

    .question-input {
        width: 80px;
        font-size: 18px;
    }
}