/**
 * ToolsBox - 公共样式
 * 纯静态多页面版本
 */

/* ========== CSS 变量 ========== */
:root {
    /* 主色调 */
    --color-primary: #1a73e8;
    --color-primary-light: #e8f0fe;
    --color-primary-dark: #1557b0;

    /* 语义色 */
    --color-success: #34a853;
    --color-warning: #fbbc04;
    --color-error: #ea4335;

    /* 文字色 */
    --color-text: #202124;
    --color-text-secondary: #5f6368;
    --color-text-light: #80868b;

    /* 边框色 */
    --color-border: #dadce0;
    --color-border-light: #e8eaed;

    /* 背景色 */
    --color-bg: #fff;
    --color-bg-secondary: #f8f9fa;
    --color-bg-tertiary: #f1f3f4;
    --color-sidebar: #fafbfc;

    /* 字体 */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;

    /* 布局 */
    --sidebar-width: 220px;
    --header-height: 56px;

    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 12px;

    /* 阴影 */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 2px 8px rgba(0,0,0,0.1);
    --shadow-lg: 0 4px 16px rgba(0,0,0,0.1);

    /* 过渡 */
    --transition: all 0.15s ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    font-family: inherit;
}

ul, ol {
    list-style: none;
}

/* ========== Header ========== */
.header {
    height: var(--header-height);
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border-light);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    padding: 0 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--color-text);
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-success));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 18px;
    font-weight: 700;
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-left: 48px;
}

.header-link {
    padding: 10px 20px;
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    border-radius: 8px;
    transition: var(--transition);
}

.header-link:hover {
    background: var(--color-bg-secondary);
    color: var(--color-text);
}

.header-link.active {
    color: var(--color-primary);
    background: var(--color-primary-light);
}

/* 汉堡菜单按钮 */
.header-menu-btn {
    display: none;
    width: 40px;
    height: 40px;
    margin-left: auto;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    transition: var(--transition);
}

.header-menu-btn:hover {
    background: var(--color-bg-secondary);
}

.header-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    margin: 6px auto;
    border-radius: 2px;
    transition: var(--transition);
}

/* 移动端抽屉导航 */
.mobile-nav-overlay {
    visibility: hidden;
    opacity: 0;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 200;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    pointer-events: none;
}

.mobile-nav-overlay.show {
    visibility: visible;
    opacity: 1;
    pointer-events: auto;
}

.mobile-nav {
    visibility: hidden;
    position: fixed;
    top: 0;
    right: -280px;
    width: 280px;
    height: 100vh;
    background: var(--color-bg);
    z-index: 201;
    padding: 20px;
    transition: right 0.3s ease, visibility 0.3s ease;
    box-shadow: -4px 0 16px rgba(0, 0, 0, 0.1);
}

.mobile-nav.show {
    visibility: visible;
    right: 0;
}

.mobile-nav-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--color-border-light);
}

.mobile-nav-title {
    font-size: 18px;
    font-weight: 600;
}

.mobile-nav-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-secondary);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 18px;
    color: var(--color-text-secondary);
    transition: var(--transition);
}

.mobile-nav-close:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-text);
}

.mobile-nav-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.mobile-nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    color: var(--color-text);
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    border-radius: 10px;
    transition: var(--transition);
}

.mobile-nav-link:hover {
    background: var(--color-bg-secondary);
}

.mobile-nav-link.active {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

.mobile-nav-link-icon {
    font-size: 20px;
}

/* ========== Layout ========== */
.layout {
    display: flex;
    padding-top: var(--header-height);
    min-height: 100vh;
}

/* ========== Footer ========== */
.footer {
    padding: 20px 24px;
    border-top: 1px solid var(--color-border-light);
    background: var(--color-bg);
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    font-size: 13px;
    color: var(--color-text-secondary);
    text-align: center;
}

.footer-links {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
}

.footer-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-copy {
    color: var(--color-text-light);
    font-size: 12px;
}

.footer-beian {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
    font-size: 12px;
}

.footer-beian-item {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    color: var(--color-text-light);
    text-decoration: none;
    transition: var(--transition);
}

.footer-beian-item:hover {
    color: var(--color-text-secondary);
}

.footer-beian-icon {
    width: 14px;
    height: 14px;
    object-fit: contain;
    vertical-align: middle;
}

/* ========== Responsive ========== */
@media (max-width: 900px) {
    /* Header 响应式 - 显示汉堡菜单 */
    .header-nav {
        display: none;
    }

    .header-menu-btn {
        display: block;
    }

    /* Footer */
    .footer {
        padding: 20px 16px;
    }

    .footer-inner {
        gap: 10px;
    }

    .footer-links {
        gap: 12px;
    }

    .footer-beian {
        gap: 12px;
        font-size: 11px;
    }
}

@media (max-width: 600px) {
    /* Header */
    .header {
        padding: 0 16px;
    }

    .logo-icon {
        width: 32px;
        height: 32px;
        font-size: 16px;
        border-radius: 8px;
    }

    .logo-text {
        font-size: 18px;
    }

    .header-menu-btn {
        width: 36px;
        height: 36px;
    }

    .header-menu-btn span {
        width: 20px;
        margin: 5px auto;
    }

    /* Footer */
    .footer {
        padding: 20px 16px;
    }

    .footer-links {
        gap: 12px;
    }

    .footer-beian {
        gap: 12px;
        font-size: 11px;
    }
}