/* 变量定义：避开AI风，选择高级知识分子/复古现代感配色 */
:root {
    --bg-color: #f7f6f3;       /* 温暖的米白纸张感 */
    --text-main: #1c2321;      /* 接近黑色的深黛绿 */
    --text-muted: #7d84b2;     /* 优雅的灰蓝 */
    --accent: #2e5339;         /* 森林绿（大峪中学的自然感） */
    --card-bg: rgba(255, 255, 255, 0.75);
    
    /* 丰富的字体阶梯 */
    --font-sans: 'Inter', -apple-system, sans-serif;
    --font-serif: 'Noto Serif SC', 'Playfair Display', serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: var(--font-sans);
    overflow-x: hidden;
}

/* 点状波浪Canvas固定置底 */
#wave-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    pointer-events: none;
}

/* 导航 */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2rem 4rem;
    position: sticky;
    top: 0;
    z-index: 10;
}
.logo {
    font-family: var(--font-serif);
    font-weight: 600;
    font-size: 1.4rem;
    letter-spacing: 1px;
}
.btn-primary {
    background: var(--accent);
    color: white;
    border: none;
    padding: 0.6rem 1.5rem;
    border-radius: 20px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: transform 0.2s;
}
.btn-primary:hover { transform: translateY(-2px); }

/* 头部样式（字体的丰富样式体现） */
.main-header {
    text-align: center;
    padding: 4rem 1rem;
}
.main-header .subtitle {
    font-family: var(--font-sans);
    font-size: 0.8rem;
    letter-spacing: 4px;
    color: var(--text-muted);
}
.main-header h1 {
    font-family: var(--font-serif);
    font-size: 3.5rem;
    font-weight: 300;
    margin: 0.5rem 0;
}
.main-header .intro {
    font-family: var(--font-serif);
    font-style: italic;
    color: #555;
}

/* 时间轴布局 */
.timeline-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 2rem 8rem 2rem;
}
.timeline {
    position: relative;
    border-left: 1px solid rgba(0,0,0,0.1);
    padding-left: 3rem;
    margin-left: 2rem;
}

/* 单个节点 */
.timeline-item {
    position: relative;
    margin-bottom: 6rem;
}
/* 时间轴上的小圆点 */
.timeline-item::before {
    content: '';
    position: absolute;
    left: calc(-3rem - 5px);
    top: 8px;
    width: 9px;
    height: 9px;
    background: var(--accent);
    border-radius: 50%;
}

/* 丰富的字体样式在内容中的体现 */
.item-meta {
    margin-bottom: 1rem;
}
.date-en {
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 1.2rem;
    color: var(--accent);
    margin-right: 1rem;
}
.date-zh {
    font-family: var(--font-serif);
    font-size: 1rem;
    color: var(--text-muted);
}

.item-content {
    background: var(--card-bg);
    backdrop-filter: blur(10px); /* 现代毛玻璃，但不用夸张的投影 */
    border: 1px solid rgba(255,255,255,0.6);
    padding: 2.5rem;
    border-radius: 12px;
}
.item-content h2 {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 1rem;
    line-height: 1.4;
}
.text-body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.8;
    color: #333;
    letter-spacing: 0.5px;
}
.text-quote {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 1.2rem;
    border-left: 3px solid var(--accent);
    padding-left: 1rem;
    color: #4a5d4e;
}

.media-wrapper {
    margin-bottom: 1.5rem;
    border-radius: 8px;
    overflow: hidden;
}
.media-wrapper img, .media-wrapper video {
    width: 100%;
    display: block;
    object-fit: cover;
}

/* 互动栏 */
.interactive-bar {
    margin-top: 2rem;
    display: flex;
    gap: 2rem;
    font-size: 0.9rem;
    color: var(--text-muted);
    align-items: center;
}
.like-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: #aaa;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
    transition: color 0.2s;
}
.like-btn.liked { color: #e63946; }

@media (max-width: 768px) {
    .navbar { padding: 1.5rem; }
    .timeline { margin-left: 0; padding-left: 1.5rem; }
    .timeline-item::before { left: calc(-1.5rem - 5px); }
    .item-content { padding: 1.5rem; }
    .main-header h1 { font-size: 2.5rem; }
  }