/* ===== 水浒典藏主题 - 水墨风优化版 ===== */
:root {
    /* 主色调 - 古籍褐 */
    --color-primary: #8B4513;
    --color-primary-light: #A0522D;
    --color-primary-dark: #6B3410;

    /* 强调色 - 鎏金 */
    --color-gold: #DAA520;
    --color-gold-light: #FFD700;
    --color-gold-dark: #B8860B;

    /* 背景色 - 宣纸米 */
    --color-paper: #F5F5DC;
    --color-paper-dark: #E8DCC0;
    --color-paper-light: #FFFEF5;

    /* 文字色 - 墨色 */
    --color-ink: #2F4F4F;
    --color-ink-light: #3F5F5F;
    --color-ink-deep: #1a1a1a;

    /* 点缀色 - 朱砂 */
    --color-red: #8B0000;
    --color-red-light: #CD5C5C;
    --color-red-dark: #5C0000;

    /* 辅助色 */
    --color-text: #333333;
    --color-text-light: #666666;
    --color-border: #8B4513;
    --color-shadow: rgba(139, 69, 19, 0.2);

    /* ===== 水墨风专用变量 ===== */
    /* 水墨渐变 */
    --ink-gradient: linear-gradient(135deg, 
        rgba(47, 79, 79, 0.03) 0%, 
        rgba(139, 69, 19, 0.05) 50%, 
        rgba(47, 79, 79, 0.03) 100%);
    
    /* 宣纸纹理 - 使用多层渐变模拟 */
    --paper-texture: 
        radial-gradient(ellipse at 20% 30%, rgba(139, 69, 19, 0.02) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 70%, rgba(47, 79, 79, 0.02) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(218, 165, 32, 0.01) 0%, transparent 70%),
        linear-gradient(180deg, #faf8f0 0%, #f5f0e0 50%, #f0ebe0 100%);
    
    /* 水墨晕染边框 */
    --ink-border: 
        0 0 0 1px rgba(139, 69, 19, 0.15),
        0 0 20px rgba(47, 79, 79, 0.08),
        0 4px 12px rgba(0, 0, 0, 0.1);
    
    /* 水墨阴影 */
    --ink-shadow: 
        0 8px 32px rgba(47, 79, 79, 0.12),
        0 2px 8px rgba(139, 69, 19, 0.08);
    
    /* 印章红色 */
    --seal-red: #C41E3A;
    --seal-shadow: 0 2px 4px rgba(196, 30, 58, 0.3);
    
    /* 毛笔笔触效果 */
    --brush-stroke: linear-gradient(90deg, 
        transparent 0%, 
        rgba(139, 69, 19, 0.1) 10%, 
        rgba(139, 69, 19, 0.15) 50%, 
        rgba(139, 69, 19, 0.1) 90%, 
        transparent 100%);

    /* 卡片尺寸 */
    --card-width: 300px;
    --card-height: 400px;
    --border-radius: 10px;

    /* 字体 - 水墨书法风格（优化 iOS 支持） */
    --font-title: "Ma Shan Zheng", "马善政", "ZCOOL KuaiLe", "站酷快乐体", "KaiTi", "STKaiti", "BiauKai", "Hiragino Sans GB", "PingFang SC", cursive;
    --font-body: "Noto Serif SC", "思源宋体", "KaiTi", "STKaiti", "BiauKai", "Hiragino Sans GB", "PingFang SC", "FangSong", serif;
    --font-seal: "ZCOOL XiaoWei", "站酷小薇", "SimSun", "Songti SC", "Hiragino Sans GB", serif;
    --font-brush: "Ma Shan Zheng", "马善政", "STXingkai", "Xingkai SC", "KaiTi", "STKaiti", "BiauKai", "Hiragino Sans GB", "PingFang SC", cursive;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background: var(--color-paper);
    min-height: 100vh;
    color: var(--color-text);
    line-height: 1.6;
}

/* 宣纸纹理背景 - 水墨风增强 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--paper-texture);
    pointer-events: none;
    z-index: -1;
}

/* 水墨晕染装饰 - 增强层次感 */
body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(ellipse at 5% 10%, rgba(47, 79, 79, 0.04) 0%, transparent 40%),
        radial-gradient(ellipse at 95% 90%, rgba(47, 79, 79, 0.04) 0%, transparent 40%),
        radial-gradient(ellipse at 50% 50%, rgba(139, 69, 19, 0.02) 0%, transparent 60%),
        radial-gradient(ellipse at 30% 70%, rgba(218, 165, 32, 0.015) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

/* ===== 大字模式 ===== */
body.large-font {
    font-size: 120%;
}

body.large-font .hero-card {
    --card-width: 360px;
    --card-height: 480px;
}

body.large-font .hero-name {
    font-size: 38px;
}

body.large-font .card-back-content {
    font-size: 15px;
}

/* ===== 头部 ===== */
.app-header {
    text-align: center;
    padding: 30px 20px 20px;
    background: linear-gradient(180deg, rgba(139,69,19,0.06) 0%, transparent 100%);
    border-bottom: 1px solid rgba(139,69,19,0.12);
    position: relative;
}

/* 卷轴装饰线 */
.app-header::before,
.app-header::after {
    content: '◇';
    position: absolute;
    bottom: -8px;
    color: var(--color-gold);
    font-size: 16px;
    background: var(--color-paper);
    padding: 0 10px;
}

.app-header::before { left: 30%; }
.app-header::after { right: 30%; }

.app-title {
    font-family: var(--font-brush);
    font-size: 46px;
    color: var(--color-ink);
    text-shadow:
        3px 3px 6px rgba(47, 79, 79, 0.15),
        0 0 20px rgba(139, 69, 19, 0.08);
    margin-bottom: 20px;
    letter-spacing: 14px;
    position: relative;
}

/* 标题装饰 - 书名号 */
.app-title::before,
.app-title::after {
    content: '『';
    color: var(--color-gold);
    margin: 0 12px;
    font-size: 0.9em;
    opacity: 0.8;
}

.app-title::after {
    content: '』';
}

/* ===== 筛选导航 ===== */
.filter-nav {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 15px;
}

.filter-btn {
    font-family: var(--font-body);
    font-size: 15px;
    padding: 10px 28px;
    border: 2px solid var(--color-primary);
    border-radius: 25px;
    background: transparent;
    color: var(--color-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    letter-spacing: 3px;
    position: relative;
    overflow: hidden;
}

.filter-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(139,69,19,0.1), transparent);
    transition: left 0.5s ease;
}

.filter-btn:hover::before {
    left: 100%;
}

.filter-btn:hover {
    background: rgba(139,69,19,0.08);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(139,69,19,0.15);
}

.filter-btn.active {
    background: var(--color-primary);
    color: var(--color-paper-light);
    box-shadow:
        0 4px 12px rgba(139,69,19,0.3),
        inset 0 1px 0 rgba(255,255,255,0.2);
}

/* ===== 排序控件 ===== */
.sort-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.sort-btn {
    font-family: var(--font-body);
    font-size: 13px;
    padding: 5px 14px;
    border: 1px solid rgba(139, 69, 19, 0.2);
    border-radius: 6px;
    background: rgba(255,255,255,0.5);
    color: var(--color-text-light);
    cursor: pointer;
    transition: all 0.2s ease;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.sort-btn:hover {
    background: rgba(255,255,255,0.8);
    border-color: var(--color-primary-light);
    color: var(--color-text);
}

.sort-btn.active {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
    box-shadow: 0 2px 6px rgba(139, 69, 19, 0.3);
}

/* ===== 工具栏 ===== */
.toolbar {
    display: flex;
    justify-content: flex-end;
    padding: 0 24px 10px;
    gap: 15px;
}

.tool-btn {
    font-family: var(--font-body);
    font-size: 13px;
    padding: 6px 14px;
    border: 1px solid rgba(139,69,19,0.3);
    border-radius: 6px;
    background: rgba(255,255,255,0.4);
    color: var(--color-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    letter-spacing: 1px;
}

.tool-btn:hover {
    background: rgba(139,69,19,0.1);
    border-color: var(--color-primary);
}

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