/* 全局样式重置和基础设置 */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* 根元素变量定义，方便统一管理颜色、字体等 */
:root {
    --primary-color: #4361ee;
    --secondary-color: #3a0ca3;
    --success-color: #4cc9f0;
    --danger-color: #f72585;
    --text-primary: #2b2d42;
    --text-secondary: #6c757d;
    --background-light: #f8f9fa;
    --background-white: #ffffff;
    --border-color: #e9ecef;
    --shadow-light: 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-hover: 0 8px 20px rgba(0, 0, 0, 0.1);
    --transition: all 0.2s ease-in-out;
    --transition-long: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --border-radius: 12px;
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --animation-duration: 0.6s;
}

/* 导入图标库 */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

/* 暗黑模式支持 */
@media (prefers-color-scheme: dark) {
    :root {
        --primary-color: #4cc9f0;
        --secondary-color: #7209b7;
        --text-primary: #f8f9fa;
        --text-secondary: #adb5bd;
        --background-light: #1a1a2e;
        --background-white: #16213e;
        --border-color: #0f3460;
        --shadow-light: 0 4px 6px rgba(0, 0, 0, 0.2);
    }
}

/* 基础字体和背景设置 */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
        'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
        sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background-color: var(--background-light);
    color: var(--text-primary);
    line-height: 1.6;
}

/* 主容器样式 */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-md);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

/* 标题样式 */
h1 {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    font-size: 2.25rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    position: relative;
    display: inline-block;
    margin-left: auto;
    margin-right: auto;
}

h1::after {
    content: '';
    position: absolute;
    left: 50%;
    bottom: -8px;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
    opacity: 0;
    transform: translateX(-50%) scaleX(0.8);
    transition: var(--transition-long);
}

.container:hover h1::after {
    opacity: 1;
    transform: translateX(-50%) scaleX(1);
}

/* 输入区域样式 */
.input-section {
    background-color: var(--background-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    margin-bottom: var(--spacing-md);
    border: 1px solid var(--border-color);
    transition: var(--transition-long);
    position: relative;
    overflow: hidden;
}

.input-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: translateX(-100%);
    transition: var(--transition-long);
}

.input-section:focus-within::before {
    transform: translateX(0);
}

.input-section:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

/* URL输入框样式 */
#url-input {
    width: 100%;
    height: 120px;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 16px;
    resize: none;
    margin-bottom: var(--spacing-md);
    font-family: inherit;
    background-color: var(--background-white);
    transition: var(--transition-long);
    position: relative;
    z-index: 1;
}

#url-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
    transform: translateY(-1px);
}

/* 模式选择器样式 */
.mode-selector {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    position: relative;
}

#url-input::placeholder {
    color: var(--text-secondary);
}

/* 模式选择器样式 */
.mode-selector {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    position: relative;
}

.mode-btn {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    background-color: var(--background-white);
    color: var(--text-secondary);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: var(--transition-long);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.mode-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    opacity: 0;
    transform: scale(0.8);
    transition: var(--transition-long);
    z-index: -1;
}

.mode-btn.active::before {
    opacity: 1;
    transform: scale(1);
}

.mode-btn.active {
    color: white;
    border-color: var(--primary-color);
}

.mode-btn:hover:not(.active) {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background-color: rgba(67, 97, 238, 0.05);
    transform: translateY(-1px);
}

/* 提交按钮样式 */
#submit-btn {
    width: 100%;
    padding: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-long);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

#submit-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: var(--transition-long);
    z-index: -1;
}

#submit-btn:hover::before {
    left: 100%;
}

#submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(67, 97, 238, 0.4);
}

#submit-btn:active {
    transform: translateY(-1px);
}

#submit-btn:disabled {
    background: linear-gradient(135deg, var(--text-secondary), var(--text-secondary));
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* 加载状态样式 */
.loading {
    text-align: center;
    padding: var(--spacing-lg);
    background-color: var(--background-white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
    position: relative;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 加载状态的装饰元素 */
.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
    animation: loadingProgress 2s infinite;
}

@keyframes loadingProgress {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* 结果区域样式 */
.result-section {
    background-color: var(--background-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
    transition: var(--transition-long);
}

.result-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--success-color), var(--primary-color));
}

.result-section:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.result-content {
    min-height: 200px;
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm);
    transition: var(--transition);
}

.result-content p {
    margin-bottom: var(--spacing-sm);
    margin-top: 0;
}

.result-content p:last-child {
    margin-bottom: 0;
}

.numbered-list {
    margin: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
}

.bullet-list {
    margin: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
}

.list-item {
    margin-bottom: var(--spacing-xs);
    line-height: 1.6;
}

.angry-emphasis {
    color: var(--danger-color);
    font-weight: 600;
}

.key-point {
    color: var(--success-color);
    font-weight: 600;
    display: inline-block;
    padding: 2px 0;
}

.result-content br {
    margin-bottom: var(--spacing-xs);
}

/* 操作按钮样式 */
.action-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

#copy-btn, #reset-btn {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: var(--transition-long);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

#copy-btn {
    background: linear-gradient(135deg, var(--success-color), #4361ee);
    color: white;
}

#copy-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: var(--transition-long);
    z-index: -1;
}

#copy-btn:hover::before {
    left: 100%;
}

#copy-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(76, 201, 240, 0.4);
}

#copy-btn:active {
    transform: translateY(-1px);
}

#reset-btn {
    background-color: var(--background-light);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    transition: var(--transition-long);
}

#reset-btn:hover {
    background-color: var(--border-color);
    transform: translateY(-1px);
}

/* 隐藏元素样式 */
.hidden {
    display: none;
}

/* 响应式设计 */
@media (max-width: 768px) {
    :root {
        --spacing-lg: 24px;
        --spacing-md: 16px;
        --spacing-sm: 12px;
    }
    
    .container {
        padding: var(--spacing-md);
        justify-content: flex-start;
        padding-top: var(--spacing-lg);
    }
    
    h1 {
        font-size: 1.75rem;
        margin-bottom: var(--spacing-md);
    }
    
    .input-section,
    .result-section {
        padding: var(--spacing-md);
    }
    
    #url-input {
        height: 100px;
        font-size: 14px;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    #copy-btn, #reset-btn {
        padding: var(--spacing-sm);
        font-size: 14px;
    }
}

/* 添加微妙的页面加载动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 错误状态抖动动画 */
@keyframes errorVibrate {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

/* 成功复制动画 */
@keyframes successAnimation {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.02);
    }
    100% {
        transform: scale(1);
    }
}

.container {
    animation: fadeIn 0.5s ease-out;
}

/* 结果区域出现的动画 */
.result-section {
    animation: slideIn 0.5s ease-out;
}

/* 为重点内容添加脉动动画 */
.key-point {
    animation: pulse 1.5s infinite;
}

/* 为模式按钮添加独特图标 */
.mode-btn#mode-angry::before {
    content: '⚡ ';
}

.mode-btn#mode-student::before {
    content: '📝 ';
}

/* 添加卡片悬停效果 */
.input-section, .result-section, .loading {
    transition: var(--transition-long);
}

.input-section:hover, .result-section:hover, .loading:hover {
    transform: translateY(-3px);
}

/* 自定义滚动条 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--background-light);
    border-radius: 4px;
}

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

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

/* 应用错误抖动动画 */
.container.error-vibrate {
    animation: errorVibrate 0.5s ease-in-out;
}

/* 应用成功复制动画 */
#copy-btn.success-animation {
    animation: successAnimation 0.5s ease-in-out;
}

/* 加载中动画状态 */
@keyframes loadingTextPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.loading p {
    animation: loadingTextPulse 1.5s infinite;
}

/* 输入框焦点状态增强 */
#url-input:focus::placeholder {
    color: var(--primary-color);
    opacity: 0.8;
}

/* 按钮按下状态 */
.mode-btn:active, #submit-btn:active, #copy-btn:active, #reset-btn:active {
    transform: translateY(1px) !important;
}

/* 为结果区域的链接添加样式 */
.result-content a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
    position: relative;
    padding: 0 2px;
}

.result-content a::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 1px;
    background-color: var(--primary-color);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.2s ease-out;
}

.result-content a:hover {
    color: var(--secondary-color);
}

.result-content a:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}