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

:root {
    /* 楚风配色方案 */
    --chu-red: #B83B28;       /* 朱红：漆器主色 */
    --chu-indigo: #202A38;    /* 靛蓝：深沉背景 */
    --chu-ocher: #D4A017;     /* 赭石/金：装饰与高亮 */
    --bg-paper: #F4F1E8;      /* 浅灰/米色：仿古纸张背景 */
    --text-dark: #2C1E1C;     /* 深褐：正文颜色 */
    --text-light: #F4F1E8;    /* 浅色：深色背景上的文字 */
}

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

body {
    background-color: var(--bg-paper);
    color: var(--text-dark);
    font-family: 'Noto Serif SC', 'SimSun', serif; /* 正文宋体 */
    line-height: 1.8;
    background-image: radial-gradient(#E6E2D6 1px, transparent 1px); /* 细微噪点纹理 */
    background-size: 20px 20px;
}

/* --- 楚式排版组件 --- */
h1, h2, h3, .brand-font {
    font-family: 'Ma Shan Zheng', cursive; /* 书法字体 */
    font-weight: 400;
}

a { text-decoration: none; transition: 0.3s; color: inherit; }

/* --- 导航栏：靛蓝底色 + 凤鸟纹装饰 --- */
header {
    background-color: var(--chu-indigo);
    color: var(--text-light);
    padding: 0 40px;
    height: 70px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 4px solid var(--chu-red);
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.logo {
    font-size: 28px;
    color: var(--chu-ocher);
    letter-spacing: 2px;
}

nav ul { display: flex; gap: 40px; }
nav a {
    color: #bbb;
    font-size: 16px;
    position: relative;
    padding: 5px 0;
}
nav a:hover, nav a.active {
    color: var(--text-light);
}
/* 简易云纹装饰线 */
nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--chu-red);
    transition: 0.3s;
}
nav a:hover::after { width: 100%; }

/* --- 通用容器 --- */
.container {
    max-width: 1200px;
    margin: 40px auto;
    padding: 0 20px;
    min-height: 80vh;
}

.page-header {
    text-align: center;
    margin-bottom: 50px;
    border-bottom: 1px solid #ddd;
    padding-bottom: 20px;
    position: relative;
}
.page-header h1 {
    font-size: 3.5rem;
    color: var(--chu-red);
}
/* 装饰性云纹图案 */
.page-header::after {
    content: "☁ ☁ ☁";
    display: block;
    color: var(--chu-ocher);
    font-size: 20px;
    margin-top: 10px;
    letter-spacing: 10px;
}

/* --- 按钮样式 --- */
.btn-chu {
    background: var(--chu-red);
    color: #fff;
    padding: 10px 25px;
    border: none;
    border-radius: 2px;
    cursor: pointer;
    font-family: 'Noto Serif SC', serif;
    font-weight: bold;
    border: 1px solid var(--chu-red);
}
.btn-chu:hover {
    background: transparent;
    color: var(--chu-red);
}
.btn-outline {
    background: transparent;
    color: var(--chu-indigo);
    border: 1px solid var(--chu-indigo);
}

/* --- Footer --- */
footer {
    background: var(--chu-indigo);
    color: #888;
    text-align: center;
    padding: 30px;
    margin-top: 60px;
    border-top: 4px solid var(--chu-ocher);
}

/* --- AI助手悬浮球 --- */
.ai-float-ball {
    position: fixed;
    right: 30px;
    bottom: 100px;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--chu-red), #8B0000);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(184, 59, 40, 0.4);
    cursor: pointer;
    z-index: 9999;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    border: 3px solid var(--chu-ocher);
}

.ai-float-ball:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(184, 59, 40, 0.6);
}

.ai-float-ball svg {
    width: 32px;
    height: 32px;
}

/* 悬浮球提示文字 */
.ai-float-ball .tooltip {
    position: absolute;
    right: 75px;
    background: var(--chu-indigo);
    color: var(--text-light);
    padding: 8px 15px;
    border-radius: 6px;
    font-size: 14px;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    border: 1px solid var(--chu-ocher);
}

.ai-float-ball .tooltip::after {
    content: '';
    position: absolute;
    right: -8px;
    top: 50%;
    transform: translateY(-50%);
    border-width: 8px 0 8px 8px;
    border-style: solid;
    border-color: transparent transparent transparent var(--chu-indigo);
}

.ai-float-ball:hover .tooltip {
    opacity: 1;
    visibility: visible;
}