/* 公共样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

/* ============================================
   顶部导航 - 重写版本
   ============================================ */

.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    box-shadow: 0 4px 20px rgba(0,0,0,0.12);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1),
                box-shadow 0.3s ease,
                padding 0.3s ease;
    transform: translateY(0);
}

/* 向下滚动时隐藏导航 */
.header.header-hidden {
    transform: translateY(-100%);
    box-shadow: none;
}

/* 滚动后导航样式 */
.header.header-scrolled {
    box-shadow: 0 6px 30px rgba(0,0,0,0.18);
}

.header.header-scrolled .logo-nav {
    padding: 12px 0;
}

.header.header-scrolled .logo-icon {
    width: 38px;
    height: 38px;
}

/* 为固定定位的 header 添加占位空间 */
body {
    padding-top: 0;
}

/* 主容器添加顶部间距避免被导航遮挡 */
main.container,
.container:first-of-type {
    margin-top: 80px;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

.logo-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
    position: relative;
    gap: 20px;
}

/* Logo 样式 */
.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: #fff;
    font-size: 22px;
    font-weight: 700;
    transition: all 0.3s ease;
    flex-shrink: 0;
}

.logo:hover {
    transform: translateY(-1px);
}

.logo-icon {
    width: 42px;
    height: 42px;
    background: rgba(255,255,255,0.25);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 12px;
    font-size: 24px;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.logo:hover .logo-icon {
    background: rgba(255,255,255,0.35);
    transform: rotate(-5deg) scale(1.05);
}

/* 导航右侧容器 */
.nav-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* 导航菜单 */
.nav {
    display: flex;
    gap: 8px;
}

.nav-groups {
    align-items: center;
    gap: 10px;
}

/* 导航分组 */
.nav-group {
    position: relative;
}

.nav-parent {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 11px 20px;
    color: rgba(255,255,255,0.95);
    background: rgba(255,255,255,0.12);
    border: 2px solid rgba(255,255,255,0.2);
    border-radius: 10px;
    cursor: pointer;
    font-size: 15px;
    font-weight: 500;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    user-select: none;
}

.nav-parent:hover {
    background: rgba(255,255,255,0.22);
    border-color: rgba(255,255,255,0.4);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.nav-parent.active,
.nav-group.open .nav-parent,
.nav-group.expanded .nav-parent {
    background: rgba(255,255,255,0.28);
    border-color: rgba(255,255,255,0.5);
    color: #fff;
}

.nav-caret {
    font-size: 14px;
    font-weight: bold;
    transition: transform 0.3s ease;
    display: inline-block;
}

.nav-group.open .nav-caret {
    transform: rotate(180deg);
}

/* 下拉菜单 */
.nav-dropdown {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    min-width: 220px;
    background: rgba(18,25,56,0.95);
    backdrop-filter: blur(12px);
    border-radius: 14px;
    padding: 10px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.25), 0 0 0 1px rgba(255,255,255,0.1);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px) scale(0.95);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1100;
}

.nav-group:hover .nav-dropdown,
.nav-group.open .nav-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.nav-dropdown::before {
    content: '';
    position: absolute;
    top: -6px;
    left: 20px;
    width: 12px;
    height: 12px;
    background: rgba(18,25,56,0.95);
    transform: rotate(45deg);
    border-top: 1px solid rgba(255,255,255,0.1);
    border-left: 1px solid rgba(255,255,255,0.1);
}

.nav-dropdown .nav-link {
    display: block;
    padding: 12px 18px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 500;
    color: rgba(255,255,255,0.85);
    margin-bottom: 4px;
    transition: all 0.25s ease;
}

.nav-dropdown .nav-link:last-child {
    margin-bottom: 0;
}

.nav-dropdown .nav-link:hover {
    background: rgba(255,255,255,0.18);
    color: #fff;
    transform: translateX(5px);
}

.nav-dropdown .nav-link.active {
    background: rgba(102,126,234,0.4);
    color: #fff;
}

/* 单个导航链接 */
.nav-link {
    display: inline-flex;
    align-items: center;
    padding: 11px 20px;
    color: rgba(255,255,255,0.95);
    text-decoration: none;
    border-radius: 10px;
    transition: all 0.3s ease;
    font-size: 15px;
    font-weight: 500;
    background: rgba(255,255,255,0.12);
    border: 2px solid rgba(255,255,255,0.2);
}

.nav-link:hover {
    background: rgba(255,255,255,0.22);
    border-color: rgba(255,255,255,0.4);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.nav-link.active {
    background: rgba(255,255,255,0.3);
    border-color: rgba(255,255,255,0.5);
    color: #fff;
    font-weight: 600;
}

.nav-link.nav-single {
    align-self: center;
}

/* 复制网址按钮 */
.copy-url-btn {
    padding: 11px 20px;
    background: rgba(255,255,255,0.2);
    color: #fff;
    border: 2px solid rgba(255,255,255,0.35);
    border-radius: 10px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
}

.copy-url-btn:hover {
    background: rgba(255,255,255,0.3);
    border-color: rgba(255,255,255,0.5);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

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

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    background: rgba(255,255,255,0.2);
    border: 2px solid rgba(255,255,255,0.35);
    color: #fff;
    padding: 12px 16px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 24px;
    line-height: 1;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    flex-shrink: 0;
}

.mobile-menu-btn:hover {
    background: rgba(255,255,255,0.3);
    transform: scale(1.05);
}

.mobile-menu-btn:active {
    transform: scale(0.95);
}

/* 移动端关闭按钮 */
.mobile-close-btn {
    display: none;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    background: #fff;
    margin: 30px auto;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.08);
}

.section-title {
    font-size: 28px;
    margin-bottom: 10px;
    color: #333;
    font-weight: 600;
}

.section-desc {
    color: #666;
    margin-bottom: 30px;
    font-size: 15px;
}

/* 颜色网格 */
.color-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 20px;
    margin-top: 25px;
}

.color-item {
    cursor: pointer;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: all 0.3s;
    background: #fff;
}

.color-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}

.color-block {
    height: 100px;
    width: 100%;
    position: relative;
}

.color-info {
    padding: 12px;
    background: #fff;
}

.color-name {
    font-size: 14px;
    color: #333;
    margin-bottom: 5px;
    font-weight: 500;
}

.color-value {
    font-size: 12px;
    color: #999;
    font-family: 'Monaco', 'Menlo', monospace;
}

.color-extra {
    font-size: 11px;
    color: #bbb;
    margin-top: 3px;
    font-family: 'Monaco', 'Menlo', monospace;
}

/* 分类标题 */
.category-title {
    margin-top: 50px;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 2px solid #667eea;
    color: #333;
    font-size: 22px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}

.category-count {
    font-size: 14px;
    color: #999;
    font-weight: normal;
}

/* 搜索框 */
.search-box {
    margin-bottom: 30px;
}

.search-input {
    width: 100%;
    max-width: 500px;
    padding: 14px 20px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 15px;
    transition: all 0.3s;
}

.search-input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102,126,234,0.1);
}

/* 按钮 */
.btn {
    padding: 12px 30px;
    background: #667eea;
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 15px;
    transition: all 0.3s;
    font-weight: 500;
}

.btn:hover {
    background: #5568d3;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102,126,234,0.3);
}

.btn-secondary {
    background: #764ba2;
}

.btn-secondary:hover {
    background: #653a8a;
}

/* 复制提示 */
.toast {
    position: fixed;
    top: 100px;
    right: 20px;
    background: #333;
    color: #fff;
    padding: 15px 25px;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    z-index: 2000;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* 页脚 */
.footer {
    background: #fff;
    border-top: 1px solid #e0e0e0;
    padding: 40px 0;
    margin-top: 60px;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    text-align: center;
    color: #666;
}

.footer-links {
    margin-bottom: 20px;
}

.footer-links a {
    color: #667eea;
    text-decoration: none;
    margin: 0 15px;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: #764ba2;
}

.copyright {
    font-size: 14px;
    color: #999;
}

.language-switch {
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid #e0e0e0;
}

.language-switch-title {
    font-size: 13px;
    color: #999;
    margin-bottom: 10px;
}

.language-links {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.language-link {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 8px 15px;
    background: #f5f5f5;
    color: #666;
    text-decoration: none;
    border-radius: 6px;
    font-size: 14px;
    transition: all 0.3s;
    border: 2px solid transparent;
}

.language-link:hover {
    background: #667eea;
    color: #fff;
    transform: translateY(-2px);
}

.language-link.active {
    background: #667eea;
    color: #fff;
    border-color: #5568d3;
    font-weight: 500;
}

/* ============================================
   响应式设计 - 移动端优化
   ============================================ */

/* 平板设备 (769px - 1024px) */
@media (min-width: 769px) and (max-width: 1024px) {
    .nav-parent,
    .nav-link {
        padding: 10px 16px;
        font-size: 14px;
    }

    .copy-url-btn {
        padding: 10px 16px;
        font-size: 13px;
    }

    .logo {
        font-size: 20px;
    }

    .logo-icon {
        width: 38px;
        height: 38px;
        font-size: 22px;
    }
}

/* 移动端 (≤768px) */
@media (max-width: 768px) {
    /* 移动端主容器顶部间距 */
    main.container,
    .container:first-of-type {
        margin-top: 70px;
    }

    .logo-nav {
        padding: 12px 0;
    }

    /* 滚动后移动端导航样式 */
    .header.header-scrolled .logo-nav {
        padding: 10px 0;
    }

    .header.header-scrolled .logo {
        font-size: 18px;
    }

    .header.header-scrolled .logo-icon {
        width: 34px;
        height: 34px;
        font-size: 19px;
    }

    /* 显示汉堡菜单按钮 */
    .mobile-menu-btn {
        display: block;
    }

    /* Logo 缩小 */
    .logo {
        font-size: 19px;
    }

    .logo-icon {
        width: 36px;
        height: 36px;
        font-size: 20px;
        margin-right: 10px;
    }

    /* 侧边抽屉式导航 */
    .nav-right {
        position: fixed;
        top: 0;
        right: -100%;
        width: 300px;
        max-width: 85vw;
        height: 100vh;
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        flex-direction: column;
        padding: 70px 20px 30px;
        gap: 0;
        transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: -5px 0 25px rgba(0,0,0,0.3);
        overflow-y: auto;
        overflow-x: hidden;
        z-index: 1001;
    }

    /* 导航打开状态 */
    .nav-right.active {
        right: 0;
    }

    /* 遮罩层 */
    .mobile-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0,0,0,0.6);
        z-index: 1000;
        opacity: 0;
        transition: opacity 0.4s ease;
        backdrop-filter: blur(4px);
    }

    .mobile-overlay.active {
        display: block;
        opacity: 1;
    }

    /* 关闭按钮 */
    .mobile-close-btn {
        display: block;
        position: absolute;
        top: 16px;
        right: 16px;
        background: rgba(255,255,255,0.25);
        border: 2px solid rgba(255,255,255,0.4);
        color: #fff;
        padding: 10px 14px;
        border-radius: 10px;
        cursor: pointer;
        font-size: 22px;
        line-height: 1;
        transition: all 0.3s ease;
        z-index: 10;
    }

    .mobile-close-btn:hover {
        background: rgba(255,255,255,0.35);
        transform: rotate(90deg) scale(1.05);
    }

    .mobile-close-btn:active {
        transform: rotate(90deg) scale(0.95);
    }

    /* 导航菜单重置 */
    .nav {
        flex-direction: column;
        width: 100%;
        gap: 0;
    }

    .nav-groups {
        flex-direction: column;
        gap: 0;
        width: 100%;
    }

    .nav-group {
        width: 100%;
    }

    /* 父级菜单按钮 */
    .nav-parent {
        width: 100%;
        justify-content: space-between;
        padding: 15px 18px;
        background: rgba(255,255,255,0.18);
        border: 2px solid rgba(255,255,255,0.3);
        margin-bottom: 8px;
        font-size: 16px;
    }

    .nav-parent:hover {
        transform: translateY(0);
        background: rgba(255,255,255,0.25);
    }

    .nav-group.open .nav-parent {
        background: rgba(255,255,255,0.3);
        border-color: rgba(255,255,255,0.5);
    }

    /* 下拉菜单 - 移动端展开式 */
    .nav-dropdown {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        background: transparent;
        border: none;
        box-shadow: none;
        padding: 0 0 8px;
        display: none;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }

    .nav-dropdown::before {
        display: none;
    }

    .nav-group.open .nav-dropdown {
        display: block;
        max-height: 500px;
    }

    .nav-dropdown .nav-link {
        width: 100%;
        padding: 13px 20px 13px 30px;
        background: rgba(0,0,0,0.12);
        border: 2px solid rgba(255,255,255,0.15);
        margin-bottom: 6px;
        font-size: 15px;
    }

    .nav-dropdown .nav-link:hover {
        transform: translateX(8px);
        background: rgba(0,0,0,0.18);
        border-color: rgba(255,255,255,0.25);
    }

    .nav-dropdown .nav-link.active {
        background: rgba(102,126,234,0.35);
        border-color: rgba(255,255,255,0.4);
    }

    /* 单个导航链接 */
    .nav-link {
        width: 100%;
        padding: 15px 18px;
        font-size: 16px;
        border-radius: 10px;
        margin-bottom: 8px;
        text-align: left;
        background: rgba(255,255,255,0.18);
        border: 2px solid rgba(255,255,255,0.3);
    }

    .nav-link:hover {
        transform: translateY(0);
        background: rgba(255,255,255,0.25);
    }

    /* 复制网址按钮 */
    .copy-url-btn {
        width: 100%;
        padding: 15px 18px;
        font-size: 15px;
        justify-content: center;
        margin-top: 20px;
        background: rgba(255,255,255,0.25);
        border-color: rgba(255,255,255,0.45);
    }

    .copy-url-btn:hover {
        transform: translateY(0);
        background: rgba(255,255,255,0.35);
    }

    /* 内容区域优化 */
    .color-grid {
        grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
        gap: 15px;
    }

    .section {
        padding: 25px 20px;
        margin: 20px auto;
    }

    .section-title {
        font-size: 22px;
    }

    .category-title {
        font-size: 18px;
        margin-top: 35px;
    }
}

/* 小屏幕手机 (≤480px) */
@media (max-width: 480px) {
    /* 小屏手机主容器顶部间距 */
    main.container,
    .container:first-of-type {
        margin-top: 65px;
    }

    .header-content {
        padding: 0 16px;
    }

    .logo-nav {
        padding: 10px 0;
    }

    .logo {
        font-size: 17px;
    }

    .logo-icon {
        width: 32px;
        height: 32px;
        font-size: 18px;
        margin-right: 8px;
    }

    .mobile-menu-btn {
        padding: 10px 14px;
        font-size: 22px;
    }

    .nav-right {
        width: 280px;
        padding: 60px 16px 24px;
    }

    .nav-parent,
    .nav-link {
        padding: 14px 16px;
        font-size: 15px;
    }

    .copy-url-btn {
        padding: 14px 16px;
        font-size: 14px;
    }

    .color-grid {
        grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
        gap: 12px;
    }

    .color-block {
        height: 80px;
    }

    .section {
        padding: 20px 16px;
        margin: 16px auto;
    }
}

/* 超宽屏优化 (≥1440px) */
@media (min-width: 1440px) {
    .logo {
        font-size: 24px;
    }

    .logo-icon {
        width: 44px;
        height: 44px;
        font-size: 26px;
    }
}