/* ============================================================
   舌尖BOSS — 通用样式（浅色系）
   ============================================================ */

/* -------------------- CSS变量 -------------------- */
:root {
    /* 浅色背景色系 */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F8F9FA;
    --bg-tertiary: #F3F4F6;

    /* 文字色系 */
    --text-primary: #1F2937;
    --text-secondary: #6B7280;
    --text-muted: #9CA3AF;

    /* 品牌色 - 简洁纯色 */
    --accent-primary: #E63946;    /* 红色 */
    --accent-secondary: #F77F00;  /* 橙色 */
    --accent-tertiary: #06AED5;   /* 蓝色 */

    /* 边框 */
    --border-light: #E5E7EB;
    --border-medium: #D1D5DB;
    --border-dark: #9CA3AF;

    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;

    /* 阴影 - 简化 */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

    /* 过渡 */
    --transition: 0.2s ease;

    /* 字体 */
    --font-cn: "PingFang SC", "Microsoft YaHei", "微软雅黑", sans-serif;
}

/* -------------------- 全局重置 -------------------- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-cn);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

button {
    font-family: inherit;
    cursor: pointer;
}

/* -------------------- 通用容器 -------------------- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 60px 0;
}

.section-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.section-subtitle {
    text-align: center;
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

/* -------------------- 顶部导航栏 -------------------- */
.navbar {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-light);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo-icon {
    color: var(--accent-primary);
    font-size: 1.5rem;
}

.nav-center {
    display: flex;
    align-items: center;
    gap: 24px;
    flex: 1;
}

.nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
}

.nav-link {
    color: var(--text-secondary);
    font-size: 0.95rem;
    padding: 6px 0;
    position: relative;
    transition: color var(--transition);
}

.nav-link:hover {
    color: var(--accent-primary);
}

.nav-link.active {
    color: var(--accent-primary);
    font-weight: 600;
}

/* 导航栏搜索 */
.nav-search-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-search-toggle {
    background: none;
    border: none;
    color: #6B7280;
    color: var(--text-secondary);
    font-size: 1.3rem;
    cursor: pointer;
    padding: 8px;
    border-radius: 4px;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-search-toggle:hover {
    color: #E63946;
    color: var(--accent-primary);
    background-color: #F3F4F6;
    background-color: var(--bg-tertiary);
}

.nav-search-box {
    display: none;
    align-items: center;
    position: relative;
}

.nav-search-box.active {
    display: flex;
    animation: searchSlideIn 0.3s ease;
}

@keyframes searchSlideIn {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.nav-search-input {
    width: 240px;
    padding: 8px 36px 8px 12px;
    border: 2px solid #D1D5DB;
    border: 2px solid var(--border-medium);
    border-radius: 20px;
    font-size: 0.9rem;
    transition: all 0.2s ease;
    transition: all var(--transition);
    outline: none;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    font-family: var(--font-cn);
}

.nav-search-input:focus {
    outline: none;
    border-color: #E63946;
    border-color: var(--accent-primary);
    width: 280px;
}

.nav-search-input::placeholder {
    color: #9CA3AF;
    color: var(--text-muted);
}

.nav-search-submit {
    position: absolute;
    right: 4px;
    background: none;
    border: none;
    color: #6B7280;
    color: var(--text-secondary);
    font-size: 1.1rem;
    cursor: pointer;
    padding: 6px 10px;
    border-radius: 50%;
    transition: all 0.2s ease;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-search-submit:hover {
    color: #E63946;
    color: var(--accent-primary);
    background-color: #F3F4F6;
    background-color: var(--bg-tertiary);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: 1px solid var(--border-medium);
    color: var(--text-primary);
    font-size: 1.5rem;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
}

/* -------------------- 按钮 -------------------- */
.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 600;
    border: none;
    transition: all var(--transition);
    cursor: pointer;
}

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

.btn-primary:hover {
    background-color: #D62839;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background: transparent;
    color: var(--accent-primary);
    border: 2px solid var(--accent-primary);
}

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

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

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

/* -------------------- 卡片 -------------------- */
.card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 24px;
    transition: all var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

/* -------------------- 标签 -------------------- */
.tag {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
}

.tag-primary {
    background-color: #FEE2E2;
    color: var(--accent-primary);
}

.tag-secondary {
    background-color: #FFF7ED;
    color: var(--accent-secondary);
}

/* -------------------- 页脚 -------------------- */
.footer {
    background-color: var(--bg-primary);
    border-top: 1px solid var(--border-light);
    padding: 40px 0 24px;
    text-align: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.footer-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 8px;
}

.footer-tech {
    color: var(--text-muted);
    font-size: 0.85rem;
}

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

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

    .nav-search-input {
        width: 180px;
    }

    .nav-search-input:focus {
        width: 200px;
    }

    .nav-center {
        gap: 12px;
    }

    .nav-links.mobile-open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--bg-primary);
        padding: 20px 24px;
        gap: 16px;
        border-bottom: 1px solid var(--border-light);
        box-shadow: var(--shadow-md);
    }

    .section {
        padding: 40px 0;
    }

    .section-title {
        font-size: 1.5rem;
    }
}