/* =========================================================
   喵字帖 - 全站共享样式
   统一：品牌主题色、页头、返回首页链接、页脚
   由 bihua.html / chaozi.html / pinyin.html / tingxie.html /
   mingtie.html / kousuan.html 共同引用（index.html 首页除外，
   首页是独立设计的导航页）
   ========================================================= */

:root {
    --brand-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --brand-primary: #667eea;
    --brand-primary-dark: #764ba2;
}

/* ===== 页头 ===== */
.header {
    background: var(--brand-gradient);
    color: white;
    padding: 28px 30px 24px;
    text-align: center;
}

/* 返回首页链接 - 每个功能页唯一的导航入口 */
.header .back-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    margin-bottom: 12px;
    padding: 6px 16px;
    background: rgba(255, 255, 255, 0.16);
    border-radius: 20px;
    color: white;
    text-decoration: none;
    font-size: 13px;
    font-weight: 600;
    transition: all 0.25s;
}

.header .back-link:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateX(-3px);
}

.header h1 {
    font-size: 2.2em;
    margin-bottom: 8px;
    line-height: 1.3;
}

.header p {
    font-size: 1em;
    opacity: 0.9;
}

/* ===== 页脚 ===== */
.footer {
    background: #f8f9fa;
    border-top: 2px solid #e9ecef;
    padding: 18px 20px;
    text-align: center;
    font-size: 12.5px;
    color: #666;
    line-height: 1.8;
}

.footer a {
    color: var(--brand-primary);
    text-decoration: none;
    font-weight: 600;
}

.footer a:hover {
    text-decoration: underline;
}

/* ===== 响应式 ===== */
@media (max-width: 600px) {
    .header {
        padding: 20px 16px 18px;
    }

    .header h1 {
        font-size: 1.6em;
    }
}

/* ===== 打印时统一隐藏页头/页脚 ===== */
@media print {

    .header,
    .footer {
        display: none;
    }
}