/* ============================================================
   易经网站样式 - 古典书卷风格
   配色：墨色为主，米白底，朱砂红点缀
   字体：思源宋体 / 楷体
   ============================================================ */

/* ---------- 字体导入 ---------- */
@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;500;600;700;900&family=Ma+Shan+Zheng&display=swap');

/* ---------- CSS 变量 ---------- */
:root {
    --color-ink: #1a1a1a;          /* 墨色 */
    --color-ink-light: #3d3d3d;    /* 浅墨 */
    --color-paper: #f5f0e6;        /* 米白底 */
    --color-paper-dark: #ebe3d3;   /* 深米白 */
    --color-cinnabar: #c0392b;     /* 朱砂红 */
    --color-cinnabar-light: #d35450;
    --color-gold: #b8860b;         /* 古金色 */
    --color-jade: #5a7d6e;         /* 玉色 */
    --color-border: #c9b99a;       /* 边框色 */
    --color-text-muted: #6b6356;   /* 次要文字 */
    
    --font-serif: 'Noto Serif SC', 'Songti SC', 'SimSun', '宋体', serif;
    --font-kai: 'KaiTi', '楷体', 'STKaiti', serif;
    --font-title: 'Ma Shan Zheng', 'Noto Serif SC', serif;
    
    --shadow-soft: 0 2px 8px rgba(26, 26, 26, 0.08);
    --shadow-card: 0 2px 12px rgba(26, 26, 26, 0.1);
    --shadow-hover: 0 4px 20px rgba(192, 57, 43, 0.15);
    
    --radius: 4px;
    --transition: all 0.25s ease;
}

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

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

body {
    font-family: var(--font-serif);
    background-color: var(--color-paper);
    color: var(--color-ink);
    line-height: 1.8;
    min-height: 100vh;
    /* 米白纸张纹理 */
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(184, 134, 11, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(192, 57, 43, 0.02) 0%, transparent 50%);
}

/* ---------- 通用容器 ---------- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ============================================================
   首页样式
   ============================================================ */

/* ---------- 顶部标题区 ---------- */
.site-header {
    text-align: center;
    padding: 60px 20px 40px;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 40px;
    position: relative;
}

.site-header::before,
.site-header::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 60px;
    height: 1px;
    background: var(--color-cinnabar);
}

.site-header::before { left: calc(50% - 180px); }
.site-header::after { right: calc(50% - 180px); }

.site-title {
    font-family: var(--font-title);
    font-size: 3rem;
    font-weight: 900;
    color: var(--color-ink);
    letter-spacing: 0.3em;
    margin-bottom: 16px;
    text-indent: 0.3em;
}

.site-subtitle {
    font-size: 1rem;
    color: var(--color-text-muted);
    letter-spacing: 0.15em;
    line-height: 2;
    max-width: 600px;
    margin: 0 auto;
}

.site-subtitle .cinnabar {
    color: var(--color-cinnabar);
    font-weight: 600;
}

/* ---------- 经文分组标题 ---------- */
.jing-section {
    margin-bottom: 50px;
}

.jing-title {
    font-family: var(--font-title);
    font-size: 1.5rem;
    color: var(--color-ink);
    text-align: center;
    margin-bottom: 30px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
}

.jing-title::before,
.jing-title::after {
    content: '';
    flex: 1;
    max-width: 100px;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--color-border), transparent);
}

.jing-title span {
    color: var(--color-cinnabar);
    font-weight: 600;
    white-space: nowrap;
}

/* ---------- 64卦网格 ---------- */
.gua-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 40px;
}

@media (min-width: 768px) {
    .gua-grid {
        grid-template-columns: repeat(6, 1fr);
        gap: 18px;
    }
}

@media (min-width: 1024px) {
    .gua-grid {
        grid-template-columns: repeat(8, 1fr);
        gap: 20px;
    }
}

/* ---------- 卦卡片 ---------- */
.gua-card {
    background: var(--color-paper);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 16px 10px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    color: var(--color-ink);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    position: relative;
    overflow: hidden;
}

.gua-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--color-cinnabar);
    transform: scaleX(0);
    transition: var(--transition);
}

.gua-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
    border-color: var(--color-cinnabar);
    background: #fff;
}

.gua-card:hover::before {
    transform: scaleX(1);
}

.gua-card .gua-num {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    font-family: var(--font-serif);
}

.gua-card .gua-name {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-ink);
    font-family: var(--font-title);
    letter-spacing: 0.05em;
}

.gua-card .gua-symbol {
    font-size: 1.4rem;
    color: var(--color-cinnabar);
    line-height: 1;
}

.gua-card .gua-fullname {
    font-size: 0.7rem;
    color: var(--color-text-muted);
    line-height: 1.4;
}

/* 卡片中的小卦画 */
.gua-card .mini-yao {
    display: flex;
    flex-direction: column-reverse;
    gap: 3px;
    margin: 4px 0;
}

.gua-card .mini-yao .yao-line {
    width: 36px;
    height: 4px;
    background: var(--color-ink);
    border-radius: 1px;
}

.gua-card .mini-yao .yao-line.yin {
    background: transparent;
    position: relative;
}

.gua-card .mini-yao .yao-line.yin::before,
.gua-card .mini-yao .yao-line.yin::after {
    content: '';
    position: absolute;
    top: 0;
    width: 15px;
    height: 4px;
    background: var(--color-ink);
    border-radius: 1px;
}

.gua-card .mini-yao .yao-line.yin::before { left: 0; }
.gua-card .mini-yao .yao-line.yin::after { right: 0; }

/* ---------- 页脚 ---------- */
.site-footer {
    text-align: center;
    padding: 40px 20px;
    border-top: 1px solid var(--color-border);
    margin-top: 60px;
    color: var(--color-text-muted);
    font-size: 0.85rem;
    line-height: 2;
}

.site-footer .cinnabar {
    color: var(--color-cinnabar);
}

/* ============================================================
   详情页样式
   ============================================================ */

/* ---------- 返回栏 ---------- */
.detail-header {
    background: var(--color-paper);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-soft);
}

.detail-header .container {
    display: flex;
    align-items: center;
    gap: 20px;
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    color: var(--color-ink);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
    font-family: var(--font-serif);
    cursor: pointer;
}

.back-btn:hover {
    background: var(--color-cinnabar);
    color: #fff;
    border-color: var(--color-cinnabar);
}

.nav-arrows {
    margin-left: auto;
    display: flex;
    gap: 8px;
}

.nav-arrow {
    padding: 8px 14px;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    color: var(--color-ink);
    text-decoration: none;
    font-size: 0.85rem;
    transition: var(--transition);
}

.nav-arrow:hover {
    background: var(--color-paper-dark);
    border-color: var(--color-cinnabar);
}

.nav-arrow.disabled {
    opacity: 0.4;
    pointer-events: none;
}

/* ---------- 卦头信息区 ---------- */
.gua-header {
    text-align: center;
    padding: 24px 16px 16px;
}

.gua-header .gua-id {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: 12px;
    letter-spacing: 0.1em;
}

.gua-header .gua-id .cinnabar {
    color: var(--color-cinnabar);
    font-weight: 600;
}

.gua-header .gua-fullname-large {
    font-family: var(--font-title);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-ink);
    margin-bottom: 8px;
    letter-spacing: 0.1em;
}

.gua-header .gua-symbol-large {
    font-size: 1.8rem;
    color: var(--color-cinnabar);
    margin: 8px 0;
    line-height: 1;
}

.gua-header .gua-composition {
    font-size: 1rem;
    color: var(--color-text-muted);
    letter-spacing: 0.1em;
}

.gua-header .gua-composition .sep {
    color: var(--color-cinnabar);
    margin: 0 8px;
}

/* ---------- 大卦画 SVG ---------- */
.gua-hexagram {
    display: flex;
    justify-content: center;
    margin: 12px auto;
    padding: 8px;
}

.gua-hexagram svg {
    display: block;
    width: 140px;
    height: auto;
}

/* ---------- Tab 切换 ---------- */
.tab-container {
    max-width: 900px;
    margin: 0 auto 40px;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-card);
}

.tab-nav {
    display: flex;
    border-bottom: 2px solid var(--color-border);
    background: var(--color-paper-dark);
}

.tab-btn {
    flex: 1;
    padding: 18px 12px;
    background: transparent;
    border: none;
    font-family: var(--font-title);
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    letter-spacing: 0.15em;
}

.tab-btn:hover {
    color: var(--color-ink);
    background: rgba(255, 255, 255, 0.5);
}

.tab-btn.active {
    color: var(--color-cinnabar);
    background: #fff;
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 20%;
    right: 20%;
    height: 3px;
    background: var(--color-cinnabar);
    border-radius: 2px;
}

.tab-btn .tab-subtitle {
    display: block;
    font-size: 0.7rem;
    font-weight: 400;
    color: var(--color-text-muted);
    margin-top: 4px;
    letter-spacing: 0.05em;
    font-family: var(--font-serif);
}

.tab-btn.active .tab-subtitle {
    color: var(--color-cinnabar-light);
}

/* ---------- Tab 内容区 ---------- */
.tab-content {
    padding: 30px;
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ---------- 内容字段卡片 ---------- */
.field-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

@media (min-width: 768px) {
    .field-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.field-item {
    padding: 16px 20px;
    background: var(--color-paper);
    border-left: 3px solid var(--color-cinnabar);
    border-radius: 0 var(--radius) var(--radius) 0;
}

.field-item.full-width {
    grid-column: 1 / -1;
}

.field-label {
    font-size: 0.85rem;
    color: var(--color-cinnabar);
    font-weight: 600;
    margin-bottom: 6px;
    letter-spacing: 0.1em;
}

.field-value {
    font-size: 1rem;
    color: var(--color-ink);
    line-height: 1.8;
}

.field-value.original-text {
    font-family: var(--font-kai);
    font-size: 1.1rem;
    color: var(--color-ink-light);
    line-height: 2;
}

/* ---------- 爻辞列表 ---------- */
.yao-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.yao-item {
    padding: 16px 20px;
    background: var(--color-paper);
    border-radius: var(--radius);
    border-left: 3px solid var(--color-border);
    transition: var(--transition);
}

.yao-item:hover {
    border-left-color: var(--color-cinnabar);
    background: #fff;
}

.yao-item .yao-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

.yao-item .yao-name {
    font-family: var(--font-title);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-cinnabar);
    min-width: 50px;
}

.yao-item .yao-text {
    font-family: var(--font-kai);
    font-size: 1.05rem;
    color: var(--color-ink);
    line-height: 1.6;
}

.yao-item .yao-interpret {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.8;
    margin-top: 6px;
    padding-left: 62px;
}

/* ---------- 原文区块 ---------- */
.original-section {
    margin-bottom: 24px;
    padding: 20px;
    background: var(--color-paper);
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
}

.original-section .section-label {
    font-size: 0.85rem;
    color: var(--color-cinnabar);
    font-weight: 600;
    margin-bottom: 10px;
    letter-spacing: 0.1em;
}

.original-section .section-text {
    font-family: var(--font-kai);
    font-size: 1.1rem;
    color: var(--color-ink);
    line-height: 2;
    text-indent: 2em;
}

/* ---------- 人事应用网格 ---------- */
.renshi-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
    margin-top: 20px;
}

@media (min-width: 600px) {
    .renshi-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.renshi-item {
    padding: 14px 18px;
    background: var(--color-paper);
    border-radius: var(--radius);
    border-top: 2px solid var(--color-jade);
}

.renshi-item .renshi-label {
    font-size: 0.8rem;
    color: var(--color-jade);
    font-weight: 600;
    margin-bottom: 4px;
}

.renshi-item .renshi-value {
    font-size: 0.95rem;
    color: var(--color-ink);
    line-height: 1.7;
}

/* ---------- 方位信息 ---------- */
.direction-box {
    display: flex;
    gap: 20px;
    margin-bottom: 8px;
}

.direction-item {
    flex: 1;
    text-align: center;
    padding: 12px;
    background: var(--color-paper);
    border-radius: var(--radius);
}

.direction-item .dir-label {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-bottom: 4px;
}

.direction-item .dir-value {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-cinnabar);
    font-family: var(--font-title);
}

/* ---------- 响应式调整 ---------- */
@media (max-width: 600px) {
    .site-title {
        font-size: 2.2rem;
    }
    
    .gua-header .gua-fullname-large {
        font-size: 1.8rem;
    }
    
    .gua-header .gua-symbol-large {
        font-size: 2.2rem;
    }
    
    .tab-btn {
        font-size: 1rem;
        padding: 14px 8px;
    }
    
    .tab-btn .tab-subtitle {
        font-size: 0.65rem;
    }
    
    .tab-content {
        padding: 20px 16px;
    }
    
    .field-grid {
        gap: 12px;
    }
    
    .detail-header .container {
        gap: 10px;
    }
    
    .back-btn {
        padding: 6px 12px;
        font-size: 0.85rem;
    }
    
    .nav-arrow {
        padding: 6px 10px;
        font-size: 0.8rem;
    }
}

/* ---------- 加载状态 ---------- */
.loading {
    text-align: center;
    padding: 60px 20px;
    color: var(--color-text-muted);
    font-size: 1.1rem;
}

.loading::after {
    content: '...';
    animation: dots 1.5s infinite;
}

@keyframes dots {
    0%, 20% { content: '.  '; }
    40% { content: '.. '; }
    60%, 100% { content: '...'; }
}

/* ---------- 错误状态 ---------- */
.error-msg {
    text-align: center;
    padding: 60px 20px;
    color: var(--color-cinnabar);
    font-size: 1.1rem;
}