/* 全局样式 */
:root {
    --color-bg-default: #ffffff;
    --color-bg-secondary: #f6f8fa;
    --color-border: #d0d7de;
    --color-text-primary: #24292f;
    --color-text-secondary: #57606a;
    --color-accent: #0969da;
    --color-accent-hover: #1b1f23;
    --color-success: #2da44e;
    --color-danger: #cf222e;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, Liberation Mono, monospace;
}

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

body {
    font-family: var(--font-sans);
    color: var(--color-text-primary);
    line-height: 1.5;
    background-color: var(--color-bg-default);
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 16px;
}

/* 导航栏 */
.header {
    background-color: var(--color-bg-default);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 24px;
}

.logo img {
    height: 60px;
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: 24px;
}

.main-nav a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 8px 0;
}

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

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.search-box {
    position: relative;
    width: 240px;
}

.search-box input {
    width: 100%;
    padding: 6px 12px;
    padding-right: 32px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 14px;
    background-color: var(--color-bg-secondary);
}

.search-box button {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: 4px;
}

.search-box button svg {
    width: 16px;
    height: 16px;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s ease;
}

.btn-primary {
    background-color: var(--color-accent);
    color: white;
    border: 1px solid var(--color-accent);
}

.btn-primary:hover {
    background-color: #1a4f91;
    border-color: #1a4f91;
}

.btn-outline {
    background-color: transparent;
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

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

/* 主要内容区域 */
.main-content {
    min-height: calc(100vh - 64px - 300px);
    padding: 40px 0;
}

/* 页脚 */
.footer {
    background-color: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: 48px 0 24px;
}

.footer-top {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-logo img {
    height: 60px;
    margin-bottom: 16px;
}

.footer-logo p {
    color: var(--color-text-secondary);
    font-size: 14px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.footer-column h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--color-text-primary);
}

.footer-column ul {
    list-style: none;
}

.footer-column li {
    margin-bottom: 8px;
}

.footer-column a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 14px;
}

.footer-column a:hover {
    color: var(--color-accent);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
}

.social-links {
    display: flex;
    gap: 16px;
}

.social-links a {
    color: var(--color-text-secondary);
    padding: 8px;
}

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

.social-links svg {
    width: 20px;
    height: 20px;
}

.copyright {
    color: var(--color-text-secondary);
    font-size: 12px;
}

/* 移动端菜单 */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    padding: 8px;
    cursor: pointer;
}

.mobile-menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-text-primary);
    margin: 4px 0;
    transition: all 0.3s ease;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .footer-top {
        grid-template-columns: 1fr;
    }

    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .header .container {
        height: 56px;
    }

    .main-nav {
        display: none;
    }

    .search-box {
        display: none;
    }

    .mobile-menu-toggle {
        display: block;
    }

    .auth-buttons {
        display: none;
    }

    .footer-links {
        grid-template-columns: 1fr;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
}