/* ==============================================
   SentenceCounter.pro 主样式文件
   设计理念：现代、简洁、高效、SEO友好
   ============================================== */

/* CSS自定义属性 - 设计系统颜色和尺寸变量 */
:root {
    /* 主要颜色系统 */
    --primary-color: #3b82f6;          /* 主品牌蓝色 */
    --primary-hover: #2563eb;          /* 主色悬停状态 */
    --primary-light: #dbeafe;          /* 主色浅色版本 */
    
    /* 辅助颜色系统 */
    --secondary-color: #6b7280;        /* 辅助灰色 */
    --accent-color: #10b981;           /* 强调绿色 */
    --success-color: #059669;          /* 成功状态绿色 */
    --warning-color: #f59e0b;          /* 警告橙色 */
    --error-color: #dc2626;            /* 错误红色 */
    
    /* 背景颜色系统 */
    --bg-primary: #ffffff;             /* 主背景白色 */
    --bg-secondary: #f9fafb;           /* 次要背景灰色 */
    --bg-tertiary: #f3f4f6;            /* 第三级背景 */
    --bg-dark: #111827;                /* 深色背景 */
    
    /* 文本颜色系统 */
    --text-primary: #111827;           /* 主要文本深灰 */
    --text-secondary: #6b7280;         /* 次要文本灰色 */
    --text-muted: #9ca3af;             /* 弱化文本浅灰 */
    --text-white: #ffffff;             /* 白色文本 */
    
    /* 边框和阴影 */
    --border-color: #e5e7eb;           /* 边框颜色 */
    --border-radius: 8px;              /* 统一圆角 */
    --border-radius-lg: 12px;          /* 大圆角 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    
    /* 字体系统 */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    --font-size-xs: 0.75rem;           /* 12px */
    --font-size-sm: 0.875rem;          /* 14px */
    --font-size-base: 1rem;            /* 16px */
    --font-size-lg: 1.125rem;          /* 18px */
    --font-size-xl: 1.25rem;           /* 20px */
    --font-size-2xl: 1.5rem;           /* 24px */
    --font-size-3xl: 1.875rem;         /* 30px */
    --font-size-4xl: 2.25rem;          /* 36px */
    
    /* 间距系统 */
    --spacing-xs: 0.25rem;             /* 4px */
    --spacing-sm: 0.5rem;              /* 8px */
    --spacing-md: 1rem;                /* 16px */
    --spacing-lg: 1.5rem;              /* 24px */
    --spacing-xl: 2rem;                /* 32px */
    --spacing-2xl: 3rem;               /* 48px */
    --spacing-3xl: 4rem;               /* 64px */
    
    /* 动画时间 */
    --transition-fast: 0.15s;
    --transition-normal: 0.3s;
    --transition-slow: 0.5s;
}

/* ==============================================
   基础重置和全局样式
   ============================================== */

/* 现代CSS重置 - 确保跨浏览器一致性 */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* HTML和body基础设置 */
html {
    line-height: 1.5;                  /* 提高可读性的行高 */
    -webkit-text-size-adjust: 100%;    /* 防止iOS字体缩放 */
    scroll-behavior: smooth;           /* 平滑滚动 */
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 25%, #f0f4ff 50%, #fef3f2 75%, #fffbeb 100%);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 链接样式重置 */
a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast) ease;
}

a:hover {
    color: var(--primary-color);
}

/* 图片响应式设置 */
img,
svg {
    max-width: 100%;
    height: auto;
    display: block;
}

/* 表单元素基础样式 */
button,
input,
textarea,
select {
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
}

/* ==============================================
   布局容器和网格系统
   ============================================== */

/* 主容器 - 响应式最大宽度 */
.container {
    width: 100%;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
}

/* 移动端容器内边距调整 */
@media (max-width: 768px) {
    .container {
        padding-left: var(--spacing-sm);
        padding-right: var(--spacing-sm);
    }
}

/* ==============================================
   网站头部导航样式
   ============================================== */

.site-header {
    background: linear-gradient(135deg, #1e293b 0%, #334155 50%, #475569 100%);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    position: sticky;               /* 粘性定位，滚动时保持可见 */
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(8px);     /* 毛玻璃效果 */
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    max-width: 1200px;
    margin: 0 auto;
}

/* Logo和品牌区域 */
.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-lg);
    transition: all var(--transition-fast) ease;
    cursor: pointer;
}

.nav-brand:hover {
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.brand-logo {
    flex-shrink: 0;
    transition: all var(--transition-fast) ease;
    filter: drop-shadow(0 2px 8px rgba(99, 102, 241, 0.3));
}

.brand-logo:hover {
    transform: scale(1.08) rotate(5deg);
    filter: drop-shadow(0 4px 12px rgba(99, 102, 241, 0.5)) brightness(1.1);
}

.logo-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    font-size: var(--font-size-lg);
    color: var(--text-primary);
}

.logo {
    width: 40px;
    height: 40px;
    border-radius: var(--border-radius);
}

.brand-text {
    background: linear-gradient(135deg, #FFFFFF 0%, #F1F5F9 25%, #E2E8F0 50%, #CBD5E1 75%, #94A3B8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
    font-size: 1.35rem;
    letter-spacing: -0.02em;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    position: relative;
}

.brand-text::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.4) 0%, rgba(255,255,255,0.1) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    z-index: 1;
    animation: shimmer 3s ease-in-out infinite;
}

@keyframes shimmer {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 0.8; }
}

.nav-brand:hover .brand-text {
    transform: scale(1.02);
    transition: transform 0.3s ease;
}

.nav-brand:hover .brand-text::before {
    opacity: 1;
}

/* 导航链接容器 */
.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

/* 导航菜单 */
.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
    align-items: center;
}

.nav-link {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    transition: all var(--transition-fast) ease;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.9);
}

.nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: #ffffff;
    transform: translateY(-1px);
}

/* 移动端菜单切换按钮 */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.hamburger {
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: all var(--transition-fast) ease;
}

/* ==============================================
   Hero区域样式 - 首屏重要内容
   ============================================== */

.hero-section {
    background: linear-gradient(135deg, rgba(255,255,255,0.9) 0%, rgba(249,250,251,0.95) 50%, rgba(255,255,255,0.9) 100%);
    backdrop-filter: blur(10px);
    padding: var(--spacing-3xl) 0;
    text-align: center;
    position: relative;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 20%, rgba(59, 130, 246, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 70% 80%, rgba(16, 185, 129, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 90% 10%, rgba(245, 158, 11, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-header {
    margin-bottom: var(--spacing-2xl);
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 2.75rem;
    margin-bottom: 1.25rem;
    font-weight: 700;
    line-height: 1.2;
    background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 30%, #60a5fa 60%, #93c5fd 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: #3b82f6;
    text-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
}

.hero-subtitle {
    font-size: 1.25rem;
    opacity: 0.95;
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.5;
    font-weight: 400;
}

/* ==============================================
   工具容器 - 核心功能区域
   ============================================== */

.tool-container {
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-2xl);
    border: 1px solid var(--border-color);
    position: relative;
    z-index: 1;
}

/* 输入区域样式 */
.input-section {
    margin-bottom: var(--spacing-xl);
}

.input-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.input-label {
    display: block;
    font-weight: 600;
    font-size: var(--font-size-lg);
    color: var(--text-primary);
    margin: 0;
    text-align: left;
}

.clear-btn-top {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    min-width: auto;
    flex-shrink: 0;
}

.clear-btn-top svg {
    width: 14px;
    height: 14px;
}

.text-input {
    width: 100%;
    min-height: 200px;
    padding: var(--spacing-lg);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    font-size: var(--font-size-base);
    line-height: 1.6;
    resize: vertical;               /* 只允许垂直调整大小 */
    transition: border-color var(--transition-fast) ease;
    background-color: var(--bg-secondary);
}

.text-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.text-input::placeholder {
    color: var(--text-muted);
}

.input-help {
    margin-top: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* ==============================================
   结果面板 - 统计数据显示
   ============================================== */

.results-panel {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.result-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    transition: all var(--transition-fast) ease;
    position: relative;
    overflow: hidden;
}

.result-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #3b82f6, #10b981, #f59e0b, #ef4444, #8b5cf6, #06b6d4);
}

/* 为不同卡片添加不同的渐变色 */
.result-card:nth-child(1)::before {
    background: linear-gradient(90deg, #3b82f6, #1d4ed8);
}

.result-card:nth-child(2)::before {
    background: linear-gradient(90deg, #10b981, #059669);
}

.result-card:nth-child(3)::before {
    background: linear-gradient(90deg, #f59e0b, #d97706);
}

.result-card:nth-child(4)::before {
    background: linear-gradient(90deg, #ef4444, #dc2626);
}

.result-card:nth-child(5)::before {
    background: linear-gradient(90deg, #8b5cf6, #7c3aed);
}

.result-card:nth-child(6)::before {
    background: linear-gradient(90deg, #06b6d4, #0891b2);
}

.result-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.result-icon {
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
    display: flex;
    justify-content: center;
}

.result-number {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
    font-feature-settings: 'tnum';  /* 等宽数字 */
}

.result-label {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.result-sublabel {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* ==============================================
   操作按钮样式
   ============================================== */

.action-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: var(--font-size-base);
    cursor: pointer;
    transition: all var(--transition-fast) ease;
    text-decoration: none;
    border: none;
    position: relative;
    overflow: hidden;
}

.btn:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* 主要按钮样式 */
.btn-primary {
    background-color: var(--primary-color);
    color: var(--text-white);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* 次要按钮样式 */
.btn-secondary {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--primary-color);
}

/* ==============================================
   内容区域样式
   ============================================== */

.main-content {
    min-height: calc(100vh - 200px);   /* 确保主内容区域有足够高度 */
}

/* 章节通用样式 */
section {
    padding: var(--spacing-3xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ==============================================
   功能介绍区域
   ============================================== */

.features-section {
    background: linear-gradient(135deg, rgba(240, 249, 255, 0.9) 0%, rgba(224, 242, 254, 0.9) 100%);
    position: relative;
}

.features-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 30%, rgba(59, 130, 246, 0.08) 0%, transparent 60%),
                radial-gradient(circle at 80% 70%, rgba(16, 185, 129, 0.08) 0%, transparent 60%);
    pointer-events: none;
    z-index: 0;
}

.features-grid {
    position: relative;
    z-index: 1;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.feature-card {
    background-color: var(--bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal) ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.feature-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
    color: var(--text-white);
}

.feature-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.feature-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.feature-list {
    list-style: none;
}

.feature-list li {
    position: relative;
    padding-left: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

/* ==============================================
   使用指南区域
   ============================================== */

.how-to-use-section {
    background: linear-gradient(135deg, rgba(255, 251, 235, 0.9) 0%, rgba(254, 243, 242, 0.9) 100%);
    position: relative;
}

.how-to-use-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 70% 20%, rgba(245, 158, 11, 0.08) 0%, transparent 60%),
                radial-gradient(circle at 30% 80%, rgba(239, 68, 68, 0.06) 0%, transparent 60%);
    pointer-events: none;
    z-index: 0;
}

.steps-container,
.tips-section {
    position: relative;
    z-index: 1;
}

.steps-container {
    max-width: 800px;
    margin: 0 auto var(--spacing-2xl);
}

.step-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    transition: background-color var(--transition-fast) ease;
}

.step-item:hover {
    background-color: var(--bg-secondary);
}

.step-number {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: var(--text-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: var(--font-size-lg);
}

.step-content {
    flex: 1;
}

.step-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.step-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 提示区域样式 */
.tips-section {
    background-color: var(--primary-light);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    max-width: 800px;
    margin: 0 auto;
}

.tips-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--primary-color);
}

.tips-list {
    list-style: none;
}

.tips-list li {
    position: relative;
    padding-left: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    line-height: 1.6;
}

.tips-list li::before {
    content: '💡';
    position: absolute;
    left: 0;
}

/* ==============================================
   FAQ区域样式
   ============================================== */

.faq-section {
    background: linear-gradient(135deg, rgba(240, 244, 255, 0.9) 0%, rgba(237, 233, 254, 0.9) 100%);
    position: relative;
}

.faq-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 50% 30%, rgba(99, 102, 241, 0.08) 0%, transparent 60%),
                radial-gradient(circle at 80% 80%, rgba(168, 85, 247, 0.06) 0%, transparent 60%);
    pointer-events: none;
    z-index: 0;
}

.faq-container {
    position: relative;
    z-index: 1;
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
    transition: all var(--transition-fast) ease;
}

.faq-item:hover {
    border-color: var(--primary-color);
}

.faq-question {
    padding: var(--spacing-lg);
    font-weight: 600;
    font-size: var(--font-size-lg);
    color: var(--text-primary);
    cursor: pointer;
    list-style: none;
    position: relative;
    transition: background-color var(--transition-fast) ease;
}

.faq-question:hover {
    background-color: var(--bg-secondary);
}

.faq-question::after {
    content: '+';
    position: absolute;
    right: var(--spacing-lg);
    top: 50%;
    transform: translateY(-50%);
    font-size: var(--font-size-xl);
    color: var(--primary-color);
    transition: transform var(--transition-fast) ease;
}

.faq-item[open] .faq-question::after {
    transform: translateY(-50%) rotate(45deg);
}

.faq-answer {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ==============================================
   网站底部样式
   ============================================== */

.site-footer {
    background-color: var(--bg-dark);
    color: var(--text-white);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section {
    text-align: left;
}

.footer-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.footer-subtitle {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-white);
}

.footer-description {
    color: var(--text-muted);
    line-height: 1.6;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: var(--text-muted);
    transition: color var(--transition-fast) ease;
}

.footer-links a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-lg);
    text-align: center;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.copyright,
.powered-by {
    color: var(--text-muted);
    font-size: var(--font-size-sm);
}

/* ==============================================
   辅助工具类
   ============================================== */

/* 文本对齐 */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

/* 显示/隐藏 */
.hidden { display: none; }
.visible { display: block; }

/* 间距工具类 */
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

/* ===========================================
   响应式设计 - 移动端适配
   =========================================== */

@media (max-width: 1024px) {
    .results-panel {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-md);
    }
}

@media (max-width: 768px) {
    .container {
        padding-left: var(--spacing-sm);
        padding-right: var(--spacing-sm);
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .tool-container {
        padding: var(--spacing-lg);
    }
    
    .results-panel {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }

    .input-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }

    .clear-btn-top {
        align-self: flex-end;
    }
}

@media (max-width: 480px) {
    .results-panel {
        grid-template-columns: 1fr;
    }

    .result-number {
        font-size: var(--font-size-2xl);
    }
}

/* ==============================================
   移动端优化样式
   ============================================== */

.mobile-optimized {
    /* 确保移动端页面在缩放状态下仍然可读 */
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
}

.mobile-optimized .container {
    padding: 0 var(--spacing-sm);
    max-width: 100%;
}

.mobile-optimized .site-header {
    /* 移动端导航栏优化 */
    padding: var(--spacing-sm) 0;
}

.mobile-optimized .nav-container {
    padding: var(--spacing-sm);
}

.mobile-optimized .brand-text {
    font-size: 1.1rem;
}

.mobile-optimized .nav-link {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.9rem;
}

.mobile-optimized .hero-section {
    padding: var(--spacing-lg) 0;
}

.mobile-optimized .hero-title {
    font-size: var(--font-size-3xl);
    line-height: 1.3;
    background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 30%, #60a5fa 60%, #93c5fd 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: #3b82f6;
}

.mobile-optimized .hero-subtitle {
    font-size: var(--font-size-lg);
}

.mobile-optimized .tool-container {
    margin: var(--spacing-sm);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
}

.mobile-optimized .text-input {
    min-height: 120px;
    font-size: 14px;
}

.mobile-optimized .results-panel {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
}

.mobile-optimized .result-card {
    padding: var(--spacing-md);
}

.mobile-optimized .result-number {
    font-size: var(--font-size-xl);
}

.mobile-optimized .result-label {
    font-size: var(--font-size-sm);
}

.mobile-optimized .action-buttons {
    flex-direction: column;
    gap: var(--spacing-sm);
}

.mobile-optimized .btn {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
}

/* 小屏移动设备特殊优化 */
.small-mobile .hero-title {
    font-size: var(--font-size-2xl);
    background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 30%, #60a5fa 60%, #93c5fd 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: #3b82f6;
}

.small-mobile .results-panel {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xs);
}

.small-mobile .result-card {
    padding: var(--spacing-sm);
}

.small-mobile .result-number {
    font-size: var(--font-size-lg);
}

.small-mobile .result-label {
    font-size: var(--font-size-xs);
}

.small-mobile .result-sublabel {
    font-size: 0.7rem;
}

.small-mobile .text-input {
    min-height: 100px;
    padding: var(--spacing-md);
    font-size: 13px;
}

.small-mobile .features-section,
.small-mobile .how-to-use-section,
.small-mobile .faq-section {
    padding: var(--spacing-lg) 0;
}

.small-mobile .section-title {
    font-size: var(--font-size-xl);
}

.small-mobile .feature-card,
.small-mobile .step-item,
.small-mobile .faq-item {
    padding: var(--spacing-md);
}

/* 确保在缩小状态下文字仍然清晰 */
@media (max-width: 480px) and (max-resolution: 150dpi) {
    .mobile-optimized {
        font-weight: 500;
    }
    
    .mobile-optimized .hero-title,
    .mobile-optimized .section-title {
        font-weight: 700;
    }
    
    .mobile-optimized .hero-title {
        background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 30%, #60a5fa 60%, #93c5fd 100%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
        color: #3b82f6;
    }
    
    .mobile-optimized .result-number {
        font-weight: 700;
    }
}

/* ==============================================
   法律文档样式
   ============================================== */

.legal-section {
    padding: var(--spacing-3xl) 0;
    background-color: var(--bg-secondary);
}

.legal-content {
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.7;
}

.legal-content h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin: var(--spacing-xl) 0 var(--spacing-md) 0;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: var(--spacing-sm);
}

.legal-content h3:first-child {
    margin-top: 0;
}

.legal-content p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

/* ==============================================
   语言选择器样式
   ============================================== */

.language-selector {
    position: relative;
    z-index: 1001; /* 确保在导航栏之上 */
}

.language-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius);
    color: var(--text-white);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast) ease;
    backdrop-filter: blur(8px);
    min-width: 120px;
}

.language-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.language-flag {
    font-size: 1.2em;
    filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.2));
}

.language-name {
    flex: 1;
    text-align: left;
}

.language-arrow {
    font-size: 0.7em;
    opacity: 0.7;
    transition: transform var(--transition-fast) ease;
}

.language-dropdown.show .language-arrow {
    transform: rotate(180deg);
}

.language-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: var(--spacing-xs);
    width: 280px;
    max-height: 400px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast) ease;
    overflow: hidden;
    backdrop-filter: blur(20px);
}

.language-dropdown.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.language-search {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.language-search input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: border-color var(--transition-fast) ease;
}

.language-search input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.language-search input::placeholder {
    color: var(--text-muted);
}

.language-list {
    max-height: 320px;
    overflow-y: auto;
    padding: var(--spacing-sm);
}

.language-list::-webkit-scrollbar {
    width: 6px;
}

.language-list::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 3px;
}

.language-list::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

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

.language-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-fast) ease;
    position: relative;
}

.language-item:hover {
    background: var(--bg-secondary);
    transform: translateX(4px);
}

.language-item.active {
    background: var(--primary-light);
    color: var(--primary-color);
    font-weight: 600;
}

.language-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 60%;
    background: var(--primary-color);
    border-radius: 2px;
}

.language-item .language-flag {
    font-size: 1.4em;
    filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.1));
}

.language-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.language-info .language-name {
    font-weight: 500;
    font-size: var(--font-size-sm);
    color: var(--text-primary);
}

.language-info .language-native {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    opacity: 0.8;
}

.language-speakers {
    display: none; /* 隐藏speakers信息 */
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    background: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: 12px;
    font-weight: 500;
}

/* RTL语言支持 */
body.rtl {
    direction: rtl;
}

body.rtl .language-dropdown {
    left: 0;
    right: auto;
}

body.rtl .language-item {
    text-align: right;
}

body.rtl .language-item:hover {
    transform: translateX(-4px);
}

body.rtl .language-item.active::before {
    left: auto;
    right: 0;
}

/* 移动端适配 */
@media (max-width: 768px) {
    .language-btn {
        min-width: 100px;
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .language-name {
        display: none; /* 移动端只显示旗帜 */
    }
    
    .language-dropdown {
        width: 250px;
        right: -20px;
    }
    
    .language-item {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .language-info .language-name {
        font-size: var(--font-size-base);
    }
}

@media (max-width: 480px) {
    .language-dropdown {
        position: fixed;
        top: auto;
        bottom: 0;
        left: 0;
        right: 0;
        width: 100%;
        max-height: 60vh;
        margin: 0;
        border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
        transform: translateY(100%);
    }
    
    .language-dropdown.show {
        transform: translateY(0);
    }
}

/* ===== 文章页面样式 ===== */

/* 单篇文章页面样式 */
.article-page {
    padding-top: 100px;
}

.article-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 60px 0;
    text-align: center;
}

.article-content-wrapper {
    max-width: 800px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

/* 返回按钮 */
.back-to-blog {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
    margin-bottom: 2rem;
    transition: color 0.3s ease;
}

.back-to-blog:hover {
    color: var(--color-primary-dark);
}

/* 导航激活状态 */
.nav-link.active {
    color: var(--color-primary);
    font-weight: 600;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .blog-hero .hero-title {
        font-size: 2rem;
    }
    
    .blog-hero .hero-subtitle {
        font-size: 1rem;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .article-card {
        padding: 1.5rem;
    }
    
    .article-meta {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .article-content-wrapper {
        padding: 2rem 1rem;
    }
    
    .article-body {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .blog-hero {
        padding: 40px 0;
    }
    
    .blog-hero .hero-title {
        font-size: 1.8rem;
    }
    
    .articles-section {
        padding: 60px 0;
    }
    
    .article-card {
        padding: 1rem;
    }
    
    .article-title {
        font-size: 1.2rem;
    }
}

/* 博客内容容器 */
.blog-content {
    padding-top: 100px;
}

/* 博客Hero区域 */
.blog-hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 60px 0;
    text-align: center;
}

.blog-hero .hero-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.blog-hero .hero-subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

/* 面包屑导航 */
.breadcrumb {
    margin-bottom: 2rem;
    font-size: 1rem;
    font-weight: 500;
}

.breadcrumb a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
}

.breadcrumb a:hover {
    color: white;
}

.breadcrumb span {
    color: white;
}

/* 文章区域 */
.articles-section {
    padding: 80px 0;
    background: var(--color-background);
}

/* 文章网格 */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

/* 文章卡片 */
.article-card {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    border: 1px solid var(--color-border);
}

.article-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

/* 文章元信息 */
.article-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

.article-meta span {
    display: flex;
    align-items: center;
}

.article-date::before {
    content: "📅";
    margin-right: 0.25rem;
}

.article-readtime::before {
    content: "⏱️";
    margin-right: 0.25rem;
}

.article-category::before {
    content: "📁";
    margin-right: 0.25rem;
}

/* 文章标签 */
.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    background: var(--color-primary-light);
    color: var(--color-primary);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

/* CTA区域优化 */
.cta-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 4rem 0;
    text-align: center;
    margin: 4rem 0 0 0;
    border-radius: 16px;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="rgba(255,255,255,0.1)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

.cta-content {
    position: relative;
    z-index: 2;
}

.cta-title {
    color: white;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.cta-subtitle {
    color: rgba(255,255,255,0.9);
    font-size: 1.2rem;
    margin-bottom: 2.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

/* 增强版CTA按钮 */
.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 1rem;
    background: white;
    color: var(--color-primary);
    padding: 1.25rem 3rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    box-shadow: 0 8px 30px rgba(0,0,0,0.2);
    border: none;
    position: relative;
    overflow: hidden;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.cta-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.6s;
}

.cta-button:hover::before {
    left: 100%;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.3);
    background: #f8f9fa;
}

.cta-button:active {
    transform: translateY(-1px);
}

.cta-button::after {
    content: "→";
    font-size: 1.4rem;
    font-weight: 900;
    transition: transform 0.3s ease;
}

.cta-button:hover::after {
    transform: translateX(8px);
}

/* 文章内CTA样式 */
.article-cta {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    padding: 3rem 2rem;
    border-radius: 20px;
    text-align: center;
    margin: 3rem 0;
    position: relative;
    overflow: hidden;
}

.article-cta::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.3; }
    50% { transform: scale(1.1); opacity: 0.1; }
}

.article-cta-title {
    color: white;
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 1rem;
    position: relative;
    z-index: 2;
}

.article-cta-text {
    color: rgba(255,255,255,0.9);
    font-size: 1.1rem;
    margin-bottom: 2rem;
    position: relative;
    z-index: 2;
    line-height: 1.6;
}

.article-cta-button {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    background: white;
    color: #f5576c;
    padding: 1rem 2.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
    position: relative;
    z-index: 2;
    border: 2px solid transparent;
}

.article-cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.25);
    border-color: white;
    background: rgba(255,255,255,0.95);
}

.article-cta-button::after {
    content: "✨";
    font-size: 1.2rem;
    transition: transform 0.3s ease;
}

.article-cta-button:hover::after {
    transform: rotate(20deg) scale(1.2);
}

/* 响应式CTA设计 */
@media (max-width: 768px) {
    .cta-title {
        font-size: 2rem;
    }
    
    .cta-subtitle {
        font-size: 1.1rem;
    }
    
    .cta-button {
        padding: 1rem 2rem;
        font-size: 1.1rem;
    }
    
    .article-cta {
        padding: 2rem 1.5rem;
        margin: 2rem 0;
    }
    
    .article-cta-title {
        font-size: 1.5rem;
    }
}