/* 1. 全局和字体设置 */
:root {
    --color-bg-dark: #1e1e2c; /* 深夜蓝/墨黑 */
    --color-text-light: #e8e8e8; /* 奶油白 */
    --color-accent-gold: #cfa864; /* 柔和金色 */
    --color-card-bg: #2b2b3e; /* 略浅的卡片背景 */
    --color-card-shadow: rgba(0, 0, 0, 0.4);
}

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

body {
    font-family: 'Lora', 'Playfair Display', serif; /* 衬线字体营造书信感 */
    background-color: var(--color-bg-dark);
    color: var(--color-text-light);
    line-height: 1.6;
    min-height: 100vh;
}

/* 2. 头部导航栏 */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 5vw;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05); /* 细微的分割线 */
}

.logo {
    font-family: 'Playfair Display', serif;
    font-size: 1.8rem;
    color: var(--color-accent-gold);
    font-weight: 400;
}

.nav-link {
    color: var(--color-text-light);
    text-decoration: none;
    margin-left: 25px;
    opacity: 0.7;
    transition: opacity 0.3s, color 0.3s;
}

.nav-link:hover {
    opacity: 1;
    color: var(--color-accent-gold);
}

/* 3. 主内容区和标题 */
.content-container {
    padding: 40px 5vw;
    text-align: center;
}

.mood-title {
    font-family: 'Playfair Display', serif;
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 50px;
    color: rgba(255, 255, 255, 0.7);
}

/* 4. 留言卡片区 (营造漂流瓶/信件流) */
.messages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); /* 自适应列 */
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
}

.message-card {
    background-color: var(--color-card-bg);
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 4px 20px var(--color-card-shadow); /* 柔和的阴影 */
    transition: transform 0.3s, box-shadow 0.3s;
    min-height: 180px; /* 保证视觉一致性 */
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
    border-left: 5px solid var(--color-accent-gold); /* 仪式感边界 */
}

.message-card:hover {
    transform: translateY(-5px); /* 微微抬升，模拟被注意 */
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.6);
}

.message-text {
    font-size: 1.05rem;
    font-style: italic; /* 增加内心独白的感觉 */
    margin-bottom: 15px;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    padding-top: 10px;
    border-top: 1px dashed rgba(255, 255, 255, 0.1); /* 虚线分隔，像信纸折痕 */
}

/* 标签样式 */
.tag {
    padding: 3px 8px;
    border-radius: 3px;
    font-weight: bold;
    font-size: 0.75rem;
    opacity: 0.8;
}
.tag-regret { background-color: #5d4037; } /* 暖棕色 */
.tag-thanks { background-color: #386a51; } /* 墨绿色 */
.tag-memory { background-color: #555577; } /* 柔和紫 */

.meta-info {
    opacity: 0.6;
}

/* 共鸣按钮 */
.resonance-btn {
    background: none;
    border: none;
    color: var(--color-accent-gold);
    cursor: pointer;
    font-size: 1rem;
    transition: color 0.2s, transform 0.2s;
}

.resonance-btn:hover {
    color: #ffd700; /* 更亮的金色 */
    transform: scale(1.1);
}