/* ========== 基础样式 ========== */
:root {
    --primary-color: #1890ff;
    --primary-hover: #40a9ff;
    --success-color: #52c41a;
    --danger-color: #ff4d4f;
    --text-color: #333;
    --text-secondary: #666;
    --border-color: #e8e8e8;
    --bg-color: #f5f5f5;
    --white: #fff;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --radius: 8px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

a {
    color: var(--primary-color);
    text-decoration: none;
}

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

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

/* ========== 顶部横幅 ========== */
.top-banner {
    background: #f0f0f0;
    padding: 10px 0;
    text-align: center;
}

/* ========== 头部 ========== */
.site-header {
    background: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
}

.logo img {
    height: 40px;
}

.main-nav {
    display: flex;
    gap: 30px;
}

.main-nav a {
    color: var(--text-color);
    font-size: 16px;
    transition: color 0.3s;
}

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

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background: var(--text-color);
    border-radius: 2px;
}

.mobile-menu {
    display: none !important;
    position: fixed !important;
    top: 70px !important;
    left: 0 !important;
    right: 0 !important;
    background: var(--white) !important;
    padding: 20px !important;
    box-shadow: var(--shadow) !important;
    z-index: 1000 !important;
}

.mobile-menu.active {
    display: block !important;
}

.mobile-menu nav {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

/* ========== 主内容区 ========== */
.main-content {
    min-height: calc(100vh - 200px);
    padding: 30px 0;
}

/* ========== 首页 ========== */
.hero {
    background: linear-gradient(135deg, var(--primary-color), #722ed1);
    color: var(--white);
    padding: 60px 0;
    text-align: center;
    border-radius: var(--radius);
    margin-bottom: 40px;
}

.hero h1 {
    font-size: 42px;
    margin-bottom: 15px;
}

.hero .subtitle {
    font-size: 20px;
    opacity: 0.9;
    margin-bottom: 30px;
}

.search-box {
    display: flex;
    max-width: 500px;
    margin: 0 auto;
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
}

.search-box input {
    flex: 1;
    padding: 15px 20px;
    border: none;
    font-size: 16px;
    outline: none;
}

.search-box button {
    padding: 15px 30px;
    background: var(--primary-color);
    color: var(--white);
    border: none;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.3s;
}

.search-box button:hover {
    background: var(--primary-hover);
}

/* ========== 工具分类 ========== */
.category-block {
    margin-bottom: 50px;
}

.category-header {
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border-color);
}

.category-title {
    font-size: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.category-icon {
    font-size: 28px;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 12px;
}

/* ============================================
   首页工具网格 - 科技蓝风格
   ============================================ */

/* 工具网格 - 电脑端每行7个 */
.tools-grid-compact {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 20px;
}

/* 工具项 */
.tool-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: inherit;
    padding: 0;
    border-radius: 12px;
    transition: all 0.3s ease;
}

.tool-item:hover {
    background: transparent;
}

.tool-item:hover .tool-icon {
    background: linear-gradient(135deg, #007bff, #0056b3);
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 123, 255, 0.35);
}

.tool-item:hover .tool-name {
    color: #007bff;
}

.tool-item .tool-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #e3f2fd, #bbdefb);
    border-radius: 18px;
    margin-bottom: 10px;
    font-size: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 123, 255, 0.12);
}

.tool-item .tool-icon img {
    width: 80px;
    height: 80px;
    border-radius: 18px;
    object-fit: cover;
}

.tool-item .tool-name {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-color);
    text-align: center;
    transition: color 0.3s ease;
}

.tool-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 15px;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    color: inherit;
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.tool-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, #f0f5ff, #e6f7ff);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 8px;
}

.tool-name {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-color);
}

.tool-desc {
    color: var(--text-secondary);
    font-size: 13px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* 工具标签 */
.tool-name .tag {
    display: inline-block;
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 3px;
    margin-left: 8px;
    vertical-align: middle;
}

.tag-featured {
    background: linear-gradient(135deg, #ff6b6b, #ffa502);
    color: #fff;
}

.tag-recommended {
    background: linear-gradient(135deg, #70a1ff, #1e90ff);
    color: #fff;
}

/* 首页推荐卡片 */
.tool-card.featured {
    border: 2px solid #ff6b6b;
    position: relative;
}

.tool-card.featured::before {
    content: '🔥';
    position: absolute;
    top: -10px;
    right: -10px;
    font-size: 24px;
}

/* 推荐/首页推荐区块 */
.featured-section,
.recommended-section {
    margin: 40px 0;
}

.section-header {
    margin-bottom: 20px;
}

.section-header h2 {
    font-size: 22px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-header .icon {
    font-size: 24px;
}

/* 小程序/APP推荐 */
.app-recommend {
    margin: 50px 0;
    padding: 30px;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.app-list {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
    justify-content: center;
}

.app-item {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 20px;
    background: #fafafa;
    border-radius: var(--radius);
    max-width: 400px;
}

.app-qrcode img {
    width: 100px;
    height: 100px;
    object-fit: contain;
    background: #fff;
    padding: 5px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.app-info h4 {
    font-size: 16px;
    margin-bottom: 8px;
    color: var(--text-color);
}

.app-info p {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.app-tip {
    font-size: 12px;
    color: var(--primary-color);
    font-style: italic;
}

@media (max-width: 768px) {
    .app-item {
        flex-direction: column;
        text-align: center;
    }
}

/* ========== 工具详情页 ========== */
.tool-page {
    padding: 0;
    margin: 0;
    min-height: calc(100vh - 140px); /* 减去头部和底部高度 */
}

/* 全屏工具容器 */
.tool-container-fullscreen {
    width: 100%;
    min-height: calc(100vh - 140px);
    background: var(--white);
}

.tool-container-fullscreen .tool-content {
    width: 100%;
    min-height: calc(100vh - 140px);
}

/* 旧的普通工具容器（保留兼容性） */
.tool-container {
    background: var(--white);
    border-radius: var(--radius);
    padding: 40px;
    box-shadow: var(--shadow);
}

/* 工具内表单样式 */
.tool-container .form-group {
    margin-bottom: 20px;
}

.tool-container .form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: #333;
    font-size: 14px;
}

.tool-container .form-group input[type="text"],
.tool-container .form-group input[type="url"],
.tool-container .form-group input[type="number"],
.tool-container .form-group textarea,
.tool-container .form-group select {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #e8e8e8;
    border-radius: 8px;
    font-size: 15px;
    transition: border-color 0.3s, box-shadow 0.3s;
    background: #fff;
}

.tool-container .form-group input:focus,
.tool-container .form-group textarea:focus,
.tool-container .form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(24, 144, 255, 0.1);
}

.tool-container .form-group small {
    display: block;
    margin-top: 6px;
    color: #999;
    font-size: 12px;
}

/* 统一按钮样式 */
.tool-container .btn {
    padding: 10px 24px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.tool-container .btn-primary {
    background: linear-gradient(135deg, #1890ff, #40a9ff);
    color: #fff;
    box-shadow: 0 2px 8px rgba(24, 144, 255, 0.3);
}

.tool-container .btn-primary:hover {
    background: linear-gradient(135deg, #40a9ff, #69c0ff);
    box-shadow: 0 4px 12px rgba(24, 144, 255, 0.4);
    transform: translateY(-1px);
}

.tool-container .btn-secondary {
    background: #f5f5f5;
    color: #666;
    border: 1px solid #e8e8e8;
}

.tool-container .btn-secondary:hover {
    background: #eee;
    border-color: #d9d9d9;
}

.tool-container .btn-danger {
    background: #fff1f0;
    color: #ff4d4f;
    border: 1px solid #ffccc7;
}

.tool-container .btn-danger:hover {
    background: #ff7875;
    color: #fff;
    border-color: #ff7875;
}

/* 工具内按钮组 */
.tool-container .form-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 20px;
    margin-bottom: 25px;
}

.tool-container .conversion-buttons {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

/* 工具内复选框和单选框 */
.tool-container .checkbox-item,
.tool-container .radio-item {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 14px;
    color: #333;
}

.tool-container .checkbox-item input,
.tool-container .radio-item input {
    width: 16px;
    height: 16px;
    accent-color: var(--primary-color);
}

/* 结果展示框 */
.tool-container .result-box,
.tool-container textarea[readonly] {
    min-height: 100px;
    padding: 15px;
    background: #fafafa;
    border: 1px solid #e8e8e8;
    border-radius: 8px;
    font-size: 16px;
    line-height: 1.6;
    color: #333;
}

/* 辅助信息区域 */
.tool-container .helper-info {
    margin-top: 30px;
    padding-top: 25px;
    border-top: 1px solid #e8e8e8;
}

.tool-container .helper-info h3 {
    font-size: 16px;
    color: #333;
    margin-bottom: 15px;
}

.tool-container .helper-info ul {
    list-style: none;
}

.tool-container .helper-info li {
    padding: 8px 0;
    color: #666;
    font-size: 14px;
    position: relative;
    padding-left: 20px;
}

.tool-container .helper-info li::before {
    content: "•";
    position: absolute;
    left: 5px;
    color: var(--primary-color);
}

/* 表格样式 */
.tool-container table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}

.tool-container table td {
    padding: 10px 15px;
    border: 1px solid #e8e8e8;
    text-align: center;
    font-size: 14px;
}

.tool-container table tr:first-child td {
    background: #fafafa;
    font-weight: 600;
}
    background: var(--white);
    border-radius: var(--radius);
    padding: 40px;
    box-shadow: var(--shadow);
}

.tool-header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
}

.tool-icon-large {
    font-size: 60px;
    margin-bottom: 20px;
}

.tool-header h1 {
    font-size: 32px;
    margin-bottom: 10px;
}

.tool-intro {
    color: var(--text-secondary);
    font-size: 16px;
}

/* 人民币转换器 */
.rmb-converter {
    max-width: 800px;
    margin: 0 auto;
}

.converter-form {
    margin-bottom: 40px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

.form-group input[type="text"],
.form-group input[type="url"],
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 16px;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-actions {
    display: flex;
    gap: 15px;
    margin-bottom: 25px;
}

.btn {
    padding: 12px 25px;
    border: none;
    border-radius: var(--radius);
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-block;
}

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

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

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

.btn-secondary:hover {
    background: #d9d9d9;
}

.result-box {
    min-height: 60px;
    padding: 20px;
    background: #f9f9f9;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
    text-align: center;
}

.result-box .error {
    color: var(--danger-color);
    font-size: 16px;
    font-weight: normal;
}

.result-box .success {
    color: var(--primary-color);
}

/* 辅助信息 */
.helper-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 40px;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
}

.helper-info h3 {
    font-size: 16px;
    margin-bottom: 15px;
    color: var(--text-color);
}

.helper-info table {
    width: 100%;
    border-collapse: collapse;
}

.helper-info td {
    padding: 8px;
    text-align: center;
    border: 1px solid var(--border-color);
}

.helper-info ul {
    list-style: none;
}

.helper-info li {
    padding: 5px 0;
    color: var(--text-secondary);
    font-size: 14px;
}

/* 相关工具 */
.related-tools {
    margin-top: 50px;
}

.related-tools h3 {
    font-size: 20px;
    margin-bottom: 20px;
}

/* ========== 分类页 ========== */
.category-header {
    margin-bottom: 30px;
}

.category-header h1 {
    display: flex;
    align-items: center;
    gap: 15px;
    font-size: 28px;
}

.empty-category {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

/* ========== 关于页 ========== */
.about-content {
    background: var(--white);
    border-radius: var(--radius);
    padding: 40px;
    box-shadow: var(--shadow);
    max-width: 800px;
    margin: 0 auto;
}

.about-content h1 {
    font-size: 32px;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.about-content h2 {
    font-size: 20px;
    margin: 30px 0 15px;
    color: var(--text-color);
}

.about-content p {
    color: var(--text-secondary);
    margin-bottom: 15px;
}

.about-content ul {
    list-style: none;
    margin-top: 10px;
}

.about-content li {
    padding: 8px 0;
    color: var(--text-secondary);
}

.about-content li strong {
    color: var(--text-color);
}

/* ========== 底部 ========== */
.site-footer {
    background: var(--white);
    border-top: 1px solid var(--border-color);
    padding: 40px 0 20px;
    margin-top: 60px;
}

.footer-links {
    margin-bottom: 30px;
}

.footer-links h4 {
    font-size: 16px;
    margin-bottom: 15px;
}

.links-list {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

.links-list a {
    color: var(--text-secondary);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    margin: 5px 0;
    color: var(--text-secondary);
    font-size: 14px;
}

.footer-bottom a {
    color: var(--text-secondary);
}

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

/* ========== 响应式 ========== */
@media (max-width: 768px) {
    .main-nav {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .hero h1 {
        font-size: 28px;
    }

    .hero .subtitle {
        font-size: 16px;
    }

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

    .tools-grid-compact {
        grid-template-columns: repeat(4, 1fr);
        gap: 12px;
    }

    .tool-item .tool-icon {
        width: 64px;
        height: 64px;
        font-size: 28px;
        border-radius: 14px;
        margin-bottom: 6px;
        box-shadow: 0 3px 10px rgba(0, 123, 255, 0.1);
    }

    .tool-item .tool-icon img {
        width: 64px;
        height: 64px;
        border-radius: 14px;
    }

    .tool-item .tool-name {
        font-size: 11px;
    }

    .tool-item:hover .tool-icon {
        transform: translateY(-3px);
        box-shadow: 0 6px 15px rgba(0, 123, 255, 0.25);
    }

    .tool-container {
        padding: 20px;
    }

    .tool-header h1 {
        font-size: 24px;
    }

    .helper-info {
        grid-template-columns: 1fr;
    }

    .form-actions {
        flex-direction: column;
    }

    .form-actions .btn {
        width: 100%;
    }

    /* 全屏工具移动端优化 */
    .tool-page {
        min-height: calc(100vh - 120px); /* 移动端调整高度 */
    }

    .tool-container-fullscreen {
        min-height: calc(100vh - 120px);
    }
}