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

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #6b7280;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --bg-color: #f9fafb;
    --card-bg: #ffffff;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --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);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-color);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
.navbar {
    background-color: var(--card-bg);
    box-shadow: var(--shadow-sm);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.95);
    border-bottom: 1px solid var(--border-color);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
    background: linear-gradient(135deg, var(--primary-color), #7c3aed);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo:hover {
    transform: scale(1.05);
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
    transform: translateX(-50%);
}

.nav-links a:hover {
    color: var(--primary-color);
    background-color: rgba(37, 99, 235, 0.1);
}

.nav-links a:hover::after {
    width: 80%;
}

/* 移动端菜单按钮 */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 101;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
    border-radius: 2px;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* 主要内容 */
.main-content {
    min-height: calc(100vh - 200px);
    padding: 2rem 0;
}

/* 页脚 */
.footer {
    background-color: #1f2937;
    color: #d1d5db;
    padding: 3rem 0 0;
    margin-top: 4rem;
}
.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 2rem;
}
.footer-section h3 {
    color: #fff;
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
}
.footer-section h4 {
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
}
.footer-section p {
    color: #9ca3af;
    line-height: 1.6;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}
.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}
.footer-links li {
    margin-bottom: 0.75rem;
}
.footer-links a {
    color: #d1d5db;
    text-decoration: none;
    transition: var(--transition);
    font-size: 0.875rem;
}
.footer-links a:hover {
    color: #fff;
    padding-left: 0.25rem;
}
.footer-bottom {
    border-top: 1px solid #374151;
    padding: 1.5rem 0;
    margin-top: 2rem;
    text-align: center;
}
.footer-copyright {
    color: #9ca3af;
    font-size: 0.875rem;
    margin: 0;
}
@media (max-width: 1024px) {
    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: 2rem;
    }
}
@media (max-width: 768px) {
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    .footer {
        padding: 2rem 0 0;
    }
}

/* 工具卡片 */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.tool-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.75rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), #7c3aed);
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}

.tool-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.tool-card:hover::before {
    transform: scaleX(1);
}

.tool-card h3 {
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
    font-weight: 600;
}

.tool-card h3 a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition);
}

.tool-card h3 a:hover {
    color: var(--primary-color);
}

.tool-card p {
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    line-height: 1.6;
    font-size: 0.9375rem;
}

.tool-card .btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: linear-gradient(135deg, var(--primary-color), #1d4ed8);
    color: #fff;
    padding: 0.625rem 1.25rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.tool-card .btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    background: linear-gradient(135deg, #1d4ed8, var(--primary-color));
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), #1d4ed8);
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9375rem;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

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

.btn:active {
    transform: translateY(0);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: linear-gradient(135deg, var(--secondary-color), #4b5563);
}

.btn-secondary:hover {
    background: linear-gradient(135deg, #4b5563, var(--secondary-color));
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), #1d4ed8);
}

/* 表单 */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

/* 加载动画 */
@keyframes spin {
    to { transform: rotate(360deg); }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.loading {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* 文件上传区域优化 */
.file-upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 3rem 2rem;
    text-align: center;
    transition: var(--transition);
    background: var(--bg-color);
    cursor: pointer;
}

.file-upload-area:hover {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.05);
}

.file-upload-area.dragover {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.1);
    transform: scale(1.02);
}

/* 进度条 */
.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    margin-top: 1rem;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), #7c3aed);
    transition: width 0.3s ease;
    border-radius: 4px;
}

/* 响应式 - 移动端优化 */
@media (max-width: 768px) {
    .navbar .container {
        flex-direction: row;
        justify-content: space-between;
        padding: 0 1rem;
        position: relative;
    }
    
    .logo {
        font-size: 1.25rem;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--card-bg);
        box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);
        flex-direction: column;
        gap: 0;
        padding: 4rem 1.5rem 1.5rem;
        transition: right 0.3s ease;
        z-index: 100;
        overflow-y: auto;
    }
    
    .nav-links.active {
        right: 0;
    }
    
    .nav-links a {
        display: block;
        padding: 1rem;
        font-size: 1rem;
        border-bottom: 1px solid var(--border-color);
        white-space: normal;
    }
    
    .nav-links a::after {
        display: none;
    }
    
    .nav-links a:hover {
        background-color: rgba(37, 99, 235, 0.1);
        color: var(--primary-color);
    }
    
    /* 移动端菜单遮罩 */
    .nav-links::before {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        width: 100vw;
        height: 100vh;
        background: rgba(0, 0, 0, 0.5);
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.3s ease;
        z-index: -1;
    }
    
    .nav-links.active::before {
        opacity: 1;
        pointer-events: all;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .tool-card {
        padding: 1.25rem;
    }
    
    .tool-card h3 {
        font-size: 1.125rem;
    }
    
    .container {
        padding: 0 1rem;
    }
    
    .hero-section {
        padding: 2.5rem 0 !important;
    }
    
    .hero-title {
        font-size: 2rem !important;
        margin-bottom: 0.75rem !important;
    }
    
    .hero-subtitle {
        font-size: 1rem !important;
        margin-bottom: 1.5rem !important;
    }
    
    .section-title {
        font-size: 1.5rem !important;
    }
    
    .footer-content {
        grid-template-columns: 1fr !important;
        gap: 2rem !important;
    }
    
    .footer-section h4 {
        font-size: 0.9375rem;
    }
    
    .footer-links {
        font-size: 0.8125rem;
    }
    
    .tool-interface {
        padding: 1.5rem !important;
    }
    
    .tool-form {
        max-width: 100% !important;
    }
    
    .word-stats {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 0.75rem !important;
    }
    
    .stat-card {
        padding: 1rem !important;
    }
    
    .stat-value {
        font-size: 1.5rem !important;
    }
    
    .stat-label {
        font-size: 0.75rem !important;
    }
    
    .btn {
        padding: 0.625rem 1rem;
        font-size: 0.875rem;
        width: 100%;
        max-width: 300px;
    }
    
    .tool-detail-layout {
        padding: 0 1rem;
    }
    
    .breadcrumb {
        padding: 0.75rem 0;
        font-size: 0.875rem;
    }
}

@media (max-width: 480px) {
    .navbar .container {
        padding: 0 0.75rem;
    }
    
    .logo {
        font-size: 1.125rem;
    }
    
    .nav-links {
        gap: 0.25rem;
    }
    
    .nav-links a {
        padding: 0.25rem 0.375rem;
        font-size: 0.75rem;
    }
    
    .hero-title {
        font-size: 1.75rem !important;
    }
    
    .hero-subtitle {
        font-size: 0.9375rem !important;
    }
    
    .btn {
        padding: 0.5rem 0.875rem;
        font-size: 0.8125rem;
    }
    
    .tool-card {
        padding: 1rem;
    }
    
    .word-stats {
        grid-template-columns: 1fr !important;
    }
    
    .tool-interface {
        padding: 1rem !important;
    }
    
    .tool-form textarea,
    .tool-form input[type="file"],
    .tool-form select {
        font-size: 0.875rem;
        padding: 0.625rem 0.75rem;
    }
}

/* 工具统计卡片 */
.word-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.25rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.stat-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* 工具表单样式 */
.tool-form .form-group {
    margin-bottom: 1.5rem;
}

.tool-form label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.tool-form input[type="file"],
.tool-form select,
.tool-form textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
}

.tool-form input[type="file"]:focus,
.tool-form select:focus,
.tool-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.tool-form textarea {
    resize: vertical;
    font-family: 'Courier New', monospace;
}

/* 工具按钮组 */
.flex {
    display: flex;
}

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

.items-center {
    align-items: center;
}

.justify-between {
    justify-content: space-between;
}

.gap-3 {
    gap: 0.75rem;
}

.space-x-4 > * + * {
    margin-left: 1rem;
}

.grid {
    display: grid;
}

.grid-cols-1 {
    grid-template-columns: repeat(1, minmax(0, 1fr));
}

.grid-cols-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

@media (min-width: 768px) {
    .md\:grid-cols-2 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 480px) {
    .btn {
        padding: 0.625rem 1rem;
        font-size: 0.875rem;
    }
    
    .tool-card h3 {
        font-size: 1.125rem;
    }
    
    .word-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stat-value {
        font-size: 1.5rem;
    }
}