/* === CSS变量 · 历史质感与现代融合 === */
:root {
    --bg-page: #f5f3ef;
    --card-bg: #fffcf8;
    --accent-ink: #2c3e4e;
    --accent-gold: #b58b5b;
    --text-primary: #2e241e;
    --text-secondary: #5e554a;
    --border-light: #e4d9cd;
    --shadow-sm: 0 8px 20px rgba(0, 0, 0, 0.04), 0 2px 6px rgba(0, 0, 0, 0.03);
    --shadow-hover: 0 16px 32px -8px rgba(45, 35, 25, 0.08);
    --font-serif: 'Times New Roman', '宋体', 'Songti SC', 'Georgia', serif;
    --font-sans: system-ui, -apple-system, 'Segoe UI', 'Helvetica Neue', 'Noto Sans', sans-serif;
    --radius-card: 24px;
    --radius-element: 40px;
    --transition: all 0.2s ease;
}

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

body {
    background-color: var(--bg-page);
    font-family: var(--font-sans);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
}

.app-container {
    max-width: 780px;
    width: 100%;
    margin: 0 auto;
}

/* 返回首页按钮 */
.back-home-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    margin-bottom: 16px;
    background: var(--card-bg);
    border: 1.5px solid var(--border-light);
    border-radius: 40px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
    box-shadow: 0 2px 6px rgba(0,0,0,0.02);
}

.back-home-btn:hover {
    background: var(--accent-gold);
    color: white;
    border-color: var(--accent-gold);
    transform: translateY(-1px);
    box-shadow: var(--shadow-hover);
}

.back-icon {
    font-size: 1.1rem;
    line-height: 1;
}

@media (max-width: 480px) {
    .back-home-btn {
        padding: 6px 12px;
        font-size: 0.85rem;
    }
}

/* 主卡片 —— 承载历史感 */
.history-card {
    background: var(--card-bg);
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-sm);
    padding: 28px 24px 32px;
    border: 1px solid var(--border-light);
    backdrop-filter: blur(2px);
    transition: var(--transition);
}

/* 头部：日期导航 & 状态 */
.card-header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 28px;
    border-bottom: 1px dashed var(--border-light);
    padding-bottom: 18px;
}

.date-area {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.date-display {
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 500;
    letter-spacing: 1px;
    color: var(--accent-ink);
    line-height: 1.2;
}

.date-controls {
    display: flex;
    gap: 8px;
}

.icon-btn {
    background: transparent;
    border: 1px solid var(--border-light);
    border-radius: 40px;
    width: 44px;
    height: 44px;
    font-size: 1.4rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
    background-color: #fffcf8;
    box-shadow: 0 2px 6px rgba(0,0,0,0.02);
}

.icon-btn:hover {
    background-color: var(--accent-gold);
    color: white;
    border-color: var(--accent-gold);
}

.cache-badge {
    font-size: 0.75rem;
    background: #eae3db;
    color: #4f4238;
    padding: 4px 12px;
    border-radius: 30px;
    letter-spacing: 0.3px;
    font-weight: 450;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    border: 1px solid #d6ccc2;
}

.cache-badge i {
    font-style: normal;
    font-size: 1.1em;
}

/* 骨架屏 & 加载状态 */
.skeleton-loader {
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 8px 0;
}

.skeleton-line {
    height: 18px;
    background: linear-gradient(90deg, #ece5de 25%, #dfd6cd 50%, #ece5de 75%);
    background-size: 200% 100%;
    border-radius: 12px;
    animation: shimmer 1.5s infinite;
}

.skeleton-line.title {
    width: 60%;
    height: 28px;
}

.skeleton-line.desc {
    height: 60px;
    width: 100%;
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* 事件展示区域 */
.event-stage {
    min-height: 240px;
    transition: opacity 0.2s;
}

.event-card {
    animation: fadeIn 0.3s;
}

.event-year {
    font-family: var(--font-serif);
    font-size: 3.4rem;
    font-weight: 500;
    color: var(--accent-gold);
    line-height: 1.1;
    margin-bottom: 6px;
    letter-spacing: 1px;
}

.event-title {
    font-size: 1.3rem;
    font-weight: 550;
    margin-bottom: 12px;
    color: var(--accent-ink);
    border-left: 4px solid var(--accent-gold);
    padding-left: 18px;
}

.event-description {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 1rem;
    word-break: break-word;
    max-height: 200px;
    overflow-y: auto;
    padding-right: 6px;
}

.event-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--accent-gold);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1.5px dotted var(--accent-gold);
    padding-bottom: 2px;
    transition: var(--transition);
}

.event-link:hover {
    color: #7e5e3e;
    border-bottom-style: solid;
}

/* 按钮组 */
.action-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin: 28px 0 18px;
}

.btn {
    background: white;
    border: 1.5px solid var(--border-light);
    padding: 10px 22px;
    border-radius: 40px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 2px 6px rgba(0,0,0,0.02);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: #fffbf9;
}

.btn-primary {
    background: var(--accent-ink);
    border-color: var(--accent-ink);
    color: white;
    box-shadow: 0 6px 12px rgba(44,62,78,0.08);
}

.btn-primary:hover {
    background: #1f2e3c;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-hover);
}

/* 全部事件列表 (展开区域) */
.all-events-panel {
    margin-top: 24px;
    border-top: 1px solid var(--border-light);
    padding-top: 20px;
    max-height: 360px;
    overflow-y: auto;
    transition: max-height 0.25s;
}

.event-list-item {
    padding: 14px 8px;
    border-bottom: 1px dashed #e0d6cc;
}

.event-list-year {
    font-weight: 700;
    color: var(--accent-gold);
    margin-right: 12px;
    font-size: 1.2rem;
}

.event-list-text {
    color: var(--text-primary);
}

.event-list-link {
    margin-left: 12px;
    font-size: 0.9rem;
    color: var(--accent-gold);
    text-decoration: none;
}

.msg-placeholder {
    text-align: center;
    padding: 30px 20px;
    color: #8e8379;
}

.error-text {
    color: #bc6c25;
}

.fade-in {
    animation: fadeIn 0.25s;
}

@keyframes fadeIn {
    from { opacity: 0.3; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 响应式微调 */
@media (max-width: 480px) {
    .history-card { padding: 20px 16px; }
    .date-display { font-size: 1.7rem; }
    .event-year { font-size: 2.6rem; }
    .btn { padding: 8px 16px; }
    .icon-btn { width: 40px; height: 40px; }
}

.hidden {
    display: none !important;
}

.flex-center {
    display: flex;
    align-items: center;
}

.link-icon {
    opacity: 0.7;
}