:root {
    --color-primary: #E60012;
    --color-bg: #F5F5F7;
    --color-card: #FFFFFF;
    --color-text-main: #1D1D1F;
    --color-text-secondary: #86868B;
    --font-stack: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-serif: 'Noto Serif SC', serif;
    --max-width: 700px;
}

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

body {
    background-color: var(--color-bg);
    color: var(--color-text-main);
    font-family: var(--font-stack);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s;
}

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

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

/* Header */
.site-header {
    background: rgba(245, 245, 247, 0.8);
    backdrop-filter: blur(20px);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 20px 0;
    margin-bottom: 40px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.logo {
    font-weight: 800;
    font-size: 24px;
    letter-spacing: -0.5px;
    color: #000;
}

.logo:hover {
    color: var(--color-primary);
}

/* Footer */
.site-footer {
    padding: 40px 0;
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 14px;
    margin-top: 60px;
}

/* Cards */
.timeline {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.card {
    background: var(--color-card);
    border-radius: 16px;
    padding: 32px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    border: 1px solid rgba(0, 0, 0, 0.02);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.08);
}

.card-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.3;
}

.card-quote {
    margin-bottom: 24px;
}

.card-quote blockquote {
    font-family: var(--font-serif);
    font-size: 21px;
    font-weight: 700;
    line-height: 1.6;
    color: #000;
    background-color: rgba(230, 0, 18, 0.04);
    border-left: 4px solid var(--color-primary);
    padding: 16px 20px;
    border-radius: 0 8px 8px 0;
    margin: 0;
    white-space: pre-wrap;
}

.card-review {
    background: #FAFAFA;
    padding: 16px;
    border-radius: 8px;
    margin-bottom: 24px;
    border: 1px solid rgba(0, 0, 0, 0.03);
}

.editor-label {
    display: block;
    text-transform: uppercase;
    font-size: 11px;
    font-weight: 700;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
    letter-spacing: 1px;
}

.card-review p {
    font-size: 15px;
    color: #444;
    white-space: pre-wrap;
}

.read-more {
    font-weight: 600;
    font-size: 15px;
    color: var(--color-primary);
}

/* Detail View */
.detail-view {
    padding-bottom: 60px;
    background: var(--color-card);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.back-nav {
    margin-bottom: 20px;
}

.back-link {
    font-size: 14px;
    color: var(--color-text-secondary);
    font-weight: 500;
}

.article-title {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 40px;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.article-quote-block {
    margin-bottom: 40px;
    padding: 20px 0;
}

.article-quote-block blockquote {
    font-family: var(--font-serif);
    font-size: 24px;
    line-height: 1.5;
    color: var(--color-primary);
    text-align: center;
    font-weight: 700;
}

.article-review-block {
    background: #F5F5F7;
    padding: 24px;
    border-radius: 12px;
    margin-bottom: 40px;
}

.article-review-block h3 {
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--color-text-secondary);
    margin-bottom: 12px;
}

.article-content {
    font-size: 18px;
    line-height: 1.8;
    color: #222;
    white-space: pre-wrap;
}

.article-content p {
    margin-bottom: 1.5em;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}


/* Toggle Logic */
.toggle-checkbox {
    display: none;
}

.expandable-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0, 1, 0, 1);
    font-size: 16px;
    line-height: 1.8;
    color: #333;
    white-space: pre-wrap;
    margin-bottom: 0;
}

.toggle-checkbox:checked+.expandable-content {
    max-height: 5000px;
    /* Large enough */
    margin-bottom: 24px;
    transition: max-height 0.4s ease-in-out;
}

.card-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid rgba(0, 0, 0, 0.03);
}

.toggle-btn {
    font-weight: 600;
    font-size: 14px;
    color: var(--color-text-secondary);
    cursor: pointer;
    user-select: none;
    display: inline-block;
    padding: 8px 16px;
    background: #f0f0f2;
    border-radius: 20px;
    transition: all 0.2s;
}

.toggle-btn:hover {
    background: #e0e0e2;
    color: #000;
}

.card-quote blockquote {
    font-family: var(--font-serif);
    font-size: 21px;
    font-weight: 700;
    line-height: 1.6;
    color: #000;
    background-color: rgba(230, 0, 18, 0.04);
    border-left: 4px solid var(--color-primary);
    padding: 16px 20px;
    border-radius: 0 8px 8px 0;
    margin: 0;
    white-space: pre-wrap;
}

/* ... existing code ... */

.toggle-btn::after {
    content: "展开摘要 ↓";
}

.toggle-checkbox:checked~.card-actions .toggle-btn::after {
    content: "收起摘要 ↑";
}

.read-original-btn {
    font-weight: 600;
    font-size: 14px;
    color: var(--color-primary);
    padding: 8px 16px;
    border: 1px solid rgba(230, 0, 18, 0.2);
    border-radius: 20px;
    transition: all 0.2s;
}

.read-original-btn:hover {
    background: var(--color-primary);
    color: white;
}