:root {
    --bg-color: #f2ede7; /* 莫兰迪底色：燕麦灰/米色 */
    --surface: #ffffff;
    --text-primary: #3d3b3a; /* 深炭灰 */
    --text-secondary: #716e6c;
    --text-light: #9e9c9a;
    --accent: #b27a62; /* 莫兰迪陶土红/砖红 */
    --accent-hover: #9c6751;
    --border: #e0dad3;
    --shadow-sm: 0 4px 10px rgba(0, 0, 0, 0.03);
    --shadow-md: 0 10px 30px rgba(178, 122, 98, 0.08);
    --radius-lg: 20px;
    --radius-md: 8px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.7;
    background-image: linear-gradient(135deg, #f2ede7 0%, #e6dfd6 100%);
    background-attachment: fixed;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
a { text-decoration: none; color: inherit; transition: color 0.3s; }
a:hover { color: var(--accent); }

/* 公共卡片与质感 */
.info-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    padding: 35px;
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.btn-solid {
    display: inline-block; width: 100%; text-align: center;
    background: var(--accent); color: #fff; border: none;
    padding: 14px 24px; font-size: 1.05rem; font-weight: 600;
    border-radius: var(--radius-md); cursor: pointer;
    transition: background 0.3s, transform 0.1s; letter-spacing: 1px;
}
.btn-solid:hover { background: var(--accent-hover); color:#fff; }
.btn-solid:active { transform: scale(0.98); }

.btn-outline {
    background: transparent; color: var(--text-primary); border: 1px solid var(--border);
    padding: 10px 20px; font-size: 0.9rem; font-weight: 600; border-radius: var(--radius-md);
    cursor: pointer; transition: all 0.2s;
}
.btn-outline:hover { background: #f9f8f6; border-color: var(--accent); color: var(--accent);}

/* Header Glassmorphism */
.glass-nav {
    position: sticky; top: 0; z-index: 100;
    background: rgba(242, 237, 231, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(224, 218, 211, 0.6);
    padding: 18px 0;
}
.nav-flex { display: flex; justify-content: space-between; align-items: center; }
.logo a { font-size: 1.5rem; font-weight: 800; color: var(--text-primary); display: flex; align-items: center; gap: 8px; letter-spacing: 1px;}
.logo-mark { color: var(--accent); font-size: 1.8rem; }
.main-menu { display: flex; gap: 28px; }
.main-menu a { font-size: 0.95rem; font-weight: 600; color: var(--text-secondary); }
.main-menu a:hover { color: var(--accent); }

/* 主体内容网格 */
.layout-grid {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 40px;
    margin-top: 40px; margin-bottom: 80px;
}
@media(max-width: 992px) { .layout-grid { grid-template-columns: 1fr; } }

/* 文章排版 */
.content-box {
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    padding: 50px;
}
.breadcrumbs { font-size: 0.9rem; color: var(--text-light); margin-bottom: 25px; }
.breadcrumbs .divider { margin: 0 8px; color: var(--border); }
.breadcrumbs .current { color: var(--text-primary); font-weight: 500;}
.article-title { font-size: 2.4rem; font-weight: 800; line-height: 1.4; color: var(--text-primary); margin-bottom: 15px; letter-spacing: -0.5px;}
.article-meta { font-size: 0.9rem; color: var(--text-light); border-bottom: 1px solid var(--border); padding-bottom: 20px; margin-bottom: 40px; }

.rich-text h2 { font-size: 1.6rem; font-weight: 700; color: var(--text-primary); margin: 45px 0 20px; display: flex; align-items: center; }
.rich-text h2::before { content: "❖"; margin-right: 12px; color: var(--accent); font-size: 1.4rem; font-weight: normal;}
.rich-text p { margin-bottom: 20px; font-size: 1.05rem; letter-spacing: 0.3px; color: #4a4847;}
.inline-link { color: var(--accent); font-weight: 600; border-bottom: 1px dashed var(--accent); padding-bottom:2px;}
.inline-link:hover { border-bottom-style: solid; }

.emphasis-block {
    background: #fdfcfb;
    border-left: 4px solid var(--accent);
    padding: 25px 30px; margin: 35px 0; border-radius: 0 12px 12px 0;
    font-size: 1.15rem; font-style: italic; color: #6b5c57; border-top: 1px solid var(--border); border-right: 1px solid var(--border); border-bottom: 1px solid var(--border);
}

/* 表格质感 */
.table-wrapper { overflow-x: auto; margin: 35px 0; border-radius: var(--radius-md); border: 1px solid var(--border); }
.minimal-table { width: 100%; border-collapse: collapse; text-align: left; background: var(--surface); }
.minimal-table th { background: #f9f8f6; padding: 18px; font-weight: 700; color: var(--text-primary); border-bottom: 2px solid var(--border); font-size: 1rem;}
.minimal-table td { padding: 18px; border-bottom: 1px solid var(--border); font-size: 0.95rem; color: var(--text-secondary);}
.minimal-table tr:last-child td { border-bottom: none; }
.minimal-table tr:hover { background: #fdfcfb; }

/* 侧边栏 */
.sidebar { display: flex; flex-direction: column; gap: 30px; }
.widget-title { font-size: 1.2rem; font-weight: 800; color: var(--text-primary); margin-bottom: 20px; border-bottom: 2px solid var(--accent); padding-bottom: 10px; display: inline-block;}
.related-list { list-style: none; }
.related-list li { margin-bottom: 16px; border-bottom: 1px dashed var(--border); padding-bottom: 16px;}
.related-list li:last-child { margin-bottom:0; padding-bottom:0; border-bottom:none;}
.related-list a { display: block; font-size: 0.95rem; color: var(--text-secondary); line-height: 1.5; padding-left: 15px; position: relative; font-weight: 500;}
.related-list a::before { content: "✦"; color: var(--accent); position: absolute; left: 0; font-size: 0.8rem; top: 2px;}
.related-list a:hover { color: var(--accent); transform: translateX(4px); }

.action-card { background: linear-gradient(135deg, #3d3b3a, #2a2827); color: #fff; border: none; }
.action-card .action-title { font-size: 1.3rem; font-weight: 800; color: #fff; margin-bottom: 15px; }
.action-card p { font-size: 0.95rem; color: #d6d3d0; margin-bottom: 25px; line-height: 1.6; }

/* 首页 Hero */
.hero-section { text-align: center; padding: 80px 0 60px; }
.hero-title { font-size: 3.6rem; font-weight: 900; letter-spacing: -1px; margin-bottom: 20px; color: var(--text-primary); }
.hero-subtitle { font-size: 1.2rem; color: var(--text-secondary); max-width: 700px; margin: 0 auto; line-height: 1.7;}

/* 工具交互区 */
.calc-workspace { margin-bottom: 80px; }
.workspace-card { padding: 45px; border-top: 5px solid var(--text-primary);}
.workspace-grid { display: grid; grid-template-columns: 1fr 1.5fr; gap: 40px; }
@media (max-width: 768px) { .workspace-grid { grid-template-columns: 1fr; } }
.panel-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 25px; }
.panel-header h3 { font-size: 1.3rem; font-weight: 800; color: var(--text-primary); }

.form-group { margin-bottom: 25px; }
.form-group label { display: block; font-weight: 700; color: var(--text-secondary); margin-bottom: 10px; font-size: 0.95rem; }
.form-input {
    width: 100%; padding: 14px 16px; border: 1px solid var(--border); border-radius: var(--radius-md);
    background: #f9f8f6; font-size: 1rem; color: var(--text-primary); outline: none; transition: all 0.3s;
    font-family: inherit;
}
.form-input:focus { border-color: var(--accent); background: #fff; box-shadow: 0 0 0 3px rgba(178, 122, 98, 0.15); }
textarea.form-input { resize: vertical; min-height: 120px; font-family: monospace; font-size: 0.95rem; line-height: 1.5;}

.result-wrap { height: 420px; overflow-y: auto; background: #fff; box-shadow: inset 0 2px 5px rgba(0,0,0,0.02);}
.data-table { width: 100%; border-collapse: collapse; text-align: left; }
.data-table th { background: #f2ede7; padding: 14px 16px; font-weight: 700; color: var(--text-primary); border-bottom: 1px solid var(--border); position: sticky; top:0; z-index: 10; font-size: 0.9rem;}
.highlight-th { color: var(--accent) !important; }
.data-table td { padding: 14px 16px; border-bottom: 1px solid var(--border); font-size: 0.95rem; font-family: monospace;}
.data-table tr:hover { background: #fdfcfb; }
.empty-state { text-align: center; padding: 40px !important; color: var(--text-light); font-family: inherit !important;}

.tst-badge { font-weight: 800; color: var(--accent); font-size: 1.05rem; }

/* Bento 布局 */
.bento-section { margin-bottom: 80px; }
.section-title { font-size: 2.2rem; font-weight: 900; text-align: center; margin-bottom: 40px; color: var(--text-primary); letter-spacing: -0.5px;}
.bento-layout { display: grid; grid-template-columns: repeat(auto-fit, minmax(350px, 1fr)); gap: 30px; }
.bento-item { border-top: 4px solid var(--text-light); }
.bento-item:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); border-top-color: var(--accent);}
.bento-item:nth-child(even) { border-top-color: var(--text-primary); }
.bento-item:nth-child(even):hover { border-top-color: var(--accent); }
.bento-title { font-size: 1.5rem; font-weight: 800; color: var(--text-primary); margin-bottom: 12px; }
.bento-desc { font-size: 0.95rem; color: var(--text-secondary); margin-bottom: 25px; line-height: 1.6;}
.bento-links { list-style: none; }
.bento-links li { margin-bottom: 12px; }
.bento-links a { font-size: 0.95rem; font-weight: 600; color: var(--text-secondary); display: block; padding: 12px 16px; background: #f9f8f6; border-radius: 8px; transition: all 0.2s; border: 1px solid transparent;}
.bento-links a:hover { background: #fff; color: var(--accent); border-color: var(--border); transform: translateX(5px); box-shadow: var(--shadow-sm);}

/* FAQ */
.faq-section { margin-bottom: 80px; padding: 60px 50px; }
.faq-grid { display: grid; gap: 24px; }
.faq-item { background: #f9f8f6; padding: 25px 30px; border-radius: var(--radius-md); border-left: 4px solid var(--text-primary); }
.faq-item h4 { font-size: 1.15rem; font-weight: 700; color: var(--text-primary); margin-bottom: 10px; }
.faq-item p { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.6;}

.site-footer { text-align: center; padding: 40px 0; font-size: 0.9rem; color: var(--text-light); border-top: 1px solid var(--border); }