/* 本地字体声明 */
@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 300;
    font-display: swap;
    src: url('./fonts/Inter-300.ttf') format('truetype');
}

@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 400;
    font-display: swap;
    src: url('./fonts/Inter-400.ttf') format('truetype');
}

@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 500;
    font-display: swap;
    src: url('./fonts/Inter-500.ttf') format('truetype');
}

@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 600;
    font-display: swap;
    src: url('./fonts/Inter-600.ttf') format('truetype');
}

@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 700;
    font-display: swap;
    src: url('./fonts/Inter-700.ttf') format('truetype');
}

@font-face {
    font-family: 'JetBrains Mono';
    font-style: normal;
    font-weight: 400;
    font-display: swap;
    src: url('./fonts/JetBrainsMono-400.ttf') format('truetype');
}

@font-face {
    font-family: 'JetBrains Mono';
    font-style: normal;
    font-weight: 500;
    font-display: swap;
    src: url('./fonts/JetBrainsMono-500.ttf') format('truetype');
}

@font-face {
    font-family: 'JetBrains Mono';
    font-style: normal;
    font-weight: 600;
    font-display: swap;
    src: url('./fonts/JetBrainsMono-600.ttf') format('truetype');
}

/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* CSS变量定义 */
:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --background-color: #0f172a;
    --surface-color: #1e293b;
    --card-color: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border-color: #475569;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 基础样式 */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, var(--background-color) 0%, #1a202c 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    min-height: 100vh;
}

/* 头部样式 */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.logo h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), #3b82f6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.25rem;
}

.tagline {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 400;
}

.nav {
    display: flex;
    gap: 0.5rem;
    background: var(--surface-color);
    padding: 0.5rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.nav-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition);
    font-size: 0.875rem;
}

.nav-btn:hover {
    background: var(--card-color);
    color: var(--text-primary);
}

.nav-btn.active {
    background: var(--primary-color);
    color: white;
    box-shadow: var(--shadow-sm);
}

/* 统计面板 */
.stats-panel {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-item {
    background: var(--surface-color);
    padding: 2rem 1.5rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.stat-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), #3b82f6);
}

.stat-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-family: 'JetBrains Mono', monospace;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
}

/* 打字练习区域 */
.typing-area {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    margin-bottom: 2rem;
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.text-display {
    padding: 2rem;
    background: var(--card-color);
    border-bottom: 1px solid var(--border-color);
    min-height: 200px;
    max-height: 300px;
    position: relative;
    overflow-wrap: break-word;
    word-wrap: break-word;
    overflow-y: auto;
}

/* 自定义滚动条样式 */
.text-display::-webkit-scrollbar {
    width: 8px;
}

.text-display::-webkit-scrollbar-track {
    background: var(--surface-color);
    border-radius: 4px;
}

.text-display::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
    transition: var(--transition);
}

.text-display::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

.text-content {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--text-secondary);
    letter-spacing: 0.025em;
    word-wrap: break-word;
    overflow-wrap: break-word;
    white-space: pre-wrap;
    word-break: break-word;
}

.text-content .char {
    position: relative;
    transition: var(--transition);
}

.text-content .char.correct {
    color: var(--success-color);
    background: rgba(16, 185, 129, 0.1);
}

.text-content .char.incorrect {
    color: var(--error-color);
    background: rgba(239, 68, 68, 0.2);
}

.text-content .char.current {
    background: var(--primary-color);
    color: white;
    animation: blink 1s infinite;
}

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

.input-area {
    padding: 0;
}

#typingInput {
    width: 100%;
    padding: 2rem;
    border: none;
    background: var(--surface-color);
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.125rem;
    line-height: 1.8;
    resize: none;
    outline: none;
    min-height: 120px;
}

#typingInput::placeholder {
    color: var(--text-muted);
}

#typingInput:focus {
    background: var(--background-color);
}

/* 控制面板 */
.control-panel {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--surface-color);
    padding: 1.5rem 2rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.difficulty-selector {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.difficulty-selector label {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.875rem;
}

#difficultySelect,
#practiceTypeSelect,
#documentSelect {
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background: var(--card-color);
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
    max-width: 400px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

#difficultySelect:focus,
#practiceTypeSelect:focus,
#documentSelect:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* 下拉菜单选项样式优化 */
#documentSelect option {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 380px;
    padding: 0.5rem;
}

.control-buttons {
    display: flex;
    gap: 1rem;
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

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

.btn-secondary:hover:not(:disabled) {
    background: var(--border-color);
    color: var(--text-primary);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 结果面板 */
.results-panel {
    background: var(--surface-color);
    padding: 2rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    margin-bottom: 2rem;
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.results-panel h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.result-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--card-color);
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--border-color);
}

.result-label {
    color: var(--text-secondary);
    font-weight: 500;
}

.result-value {
    color: var(--text-primary);
    font-weight: 600;
    font-family: 'JetBrains Mono', monospace;
}

/* 统计页面 */
.stats-page {
    animation: fadeIn 0.3s ease-in-out;
}

.stats-page h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.stats-card {
    background: var(--surface-color);
    padding: 2rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
}

.stats-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
}

.stats-content p {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

.stats-content span {
    color: var(--text-primary);
    font-weight: 600;
    font-family: 'JetBrains Mono', monospace;
}

.history-section {
    background: var(--surface-color);
    padding: 2rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.history-section h3 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.history-list {
    max-height: 400px;
    overflow-y: auto;
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    margin-bottom: 0.5rem;
    background: var(--card-color);
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.history-item:hover {
    background: var(--border-color);
}

.history-date {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.history-stats {
    display: flex;
    gap: 1rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.875rem;
}

.history-stat {
    color: var(--text-secondary);
}

/* 动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.3s ease-in-out;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .header {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .logo h1 {
        font-size: 2rem;
    }
    
    .nav {
        width: 100%;
        justify-content: center;
    }
    
    .stats-panel {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
    
    .stat-item {
        padding: 1.5rem 1rem;
    }
    
    .stat-value {
        font-size: 2rem;
    }
    
    .text-display {
        padding: 1.5rem;
        min-height: 150px;
        max-height: 250px;
    }
    
    .text-content {
        font-size: 1rem;
    }
    
    #typingInput {
        padding: 1.5rem;
        font-size: 1rem;
        min-height: 100px;
    }
    
    .control-panel {
        flex-direction: column;
        align-items: stretch;
        padding: 1.5rem;
    }
    
    .control-buttons {
        justify-content: center;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .result-stats {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .stats-panel {
        grid-template-columns: 1fr;
    }
    
    .nav {
        flex-direction: column;
    }
    
    .control-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--surface-color);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* 选择文本样式 */
::selection {
    background: rgba(37, 99, 235, 0.3);
    color: var(--text-primary);
}

/* 焦点样式 */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}