:root {
    /* --- 核心配色 (Christmas Palette) --- */
    --color-primary: #BF0A0A;       /* 圣诞红：核心按钮、重要提示、标题 */
    --color-primary-dark: #8E0000;  /* 圣诞红（深色）：Hover状态 */
    
    --color-secondary: #0B6623;     /* 森林绿：辅色、装饰元素 */
    --color-secondary-dark: #064015;/* 森林绿（深色）：渐变末端 */
    
    --color-background: #FFFBF5;    /* 柔和奶油：页面背景 */
    
    --color-accent: #DAA520;        /* 节日金：点缀、Focus状态、高级感 */
    --color-accent-dark: #B8860B;   /* 节日金（深色） */
    
    --color-text: #333333;          /* 深灰：主要文字 */
    --color-text-light: #666666;    /* 浅灰：次要文字 */
    --color-text-muted: #999999;    /* 灰色：提示文字 */
    
    --color-white: #ffffff;
    --color-border: #e0e0e0;
    --color-error: #c33;
    --color-error-bg: #fee;
    --color-success: #3c3;
    --color-success-bg: #efe;

    /* --- 渐变预设 --- */
    --gradient-christmas: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-secondary-dark) 100%); /* 森林绿渐变 */
    --gradient-red: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);           /* 红色渐变 */
    --gradient-gold: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);            /* 金色渐变 */
    
    /* --- 通用尺寸 --- */
    --border-radius: 8px;
    --border-radius-lg: 16px;
    --container-width: 1200px;
    --container-width-sm: 600px;
}

/* --- Reset & Base --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--color-background);
    color: var(--color-text);
    min-height: 100vh;
    line-height: 1.5;
    font-size: 16px; /* Base font size for readability */
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--color-primary-dark);
}

/* --- Layout --- */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 20px;
}

.header {
    background: var(--gradient-christmas);
    color: var(--color-white);
    padding: 20px 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    align-items: center;
}

.header h1 {
    font-size: 24px;
    font-weight: 700;
}

.header a {
    color: var(--color-white);
}

/* --- Components: Buttons --- */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: var(--border-radius);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    text-align: center;
    text-decoration: none; /* Ensure links styled as buttons don't have underline */
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* 默认Header中的透明按钮 */
.header .btn {
    padding: 8px 16px;
    background: rgba(255,255,255,0.2);
    border: 1px solid rgba(255,255,255,0.3);
    color: var(--color-white);
}

.header .btn:hover {
    background: rgba(255,255,255,0.3);
}

/* 红色主按钮 (用于创建、提交、购买) */
.btn-primary {
    background: var(--color-primary);
    color: var(--color-white);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(191, 10, 10, 0.3);
}

/* 金色按钮 (用于升级、VIP操作) */
.btn-gold {
    background: var(--gradient-gold);
    color: var(--color-white);
}

.btn-gold:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(218, 165, 32, 0.3);
}

/* 绿色按钮 (用于查看、返回) */
.btn-view, .btn-secondary {
    background: var(--color-secondary);
    color: var(--color-white);
}

.btn-view:hover, .btn-secondary:hover {
    background: var(--color-secondary-dark);
}

/* 危险操作按钮 */
.btn-delete {
    background: #f5f5f5;
    color: var(--color-text-muted);
}

.btn-delete:hover {
    background: var(--color-error-bg);
    color: var(--color-error);
}

/* 图标按钮 (用于手机端紧凑操作) */
.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%; /* Make it round */
    font-size: 18px; /* For the icon */
}

/* --- Components: Forms --- */
.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--color-text);
    font-weight: 500;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    font-size: 14px;
    background: var(--color-white);
    transition: all 0.3s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(218, 165, 32, 0.15);
}

.hint {
    color: var(--color-text-muted);
    font-size: 12px;
    margin-top: 5px;
}

/* --- Components: Cards --- */
.card {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    padding: 30px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    margin-bottom: 20px;
}

/* --- Components: Messages --- */
.message, .error-message, .success-message {
    padding: 12px 15px;
    border-radius: var(--border-radius);
    margin-bottom: 20px;
    font-size: 14px;
    display: none;
}

.message.error, .error-message {
    background: var(--color-error-bg);
    color: var(--color-error);
    display: none; /* JS控制显示 */
}

.message.success, .success-message {
    background: var(--color-success-bg);
    color: var(--color-secondary); /* 成功用绿色文字 */
    display: none; /* JS控制显示 */
}

/* --- Utilities --- */
.text-center { text-align: center; }
.mt-10 { margin-top: 10px; }
.mb-20 { margin-bottom: 20px; }