/* 无记 · Deep v1.0.0
   复刻 wuji v2.0.1 视觉骨架，米白底 + 朱砂 + 杉本博司留白。
   主区: 主题/研究卡片 grid + intro 段。
*/

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

:root {
    --bg-base: #faf7f0;
    --text-primary: #000000;
    --text-muted: #6b6b6b;
    --line-subtle: rgba(0,0,0,0.06);
    --accent: #8b1a1a;
    --font-serif: "Cormorant Garamond", "Noto Serif SC", Georgia, serif;
    --container: 1160px;
}

html, body { min-height: 100%; }

body {
    background: var(--bg-base);
    color: var(--text-primary);
    font-family: var(--font-serif);
    font-weight: 400;
    font-size: 14px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; text-decoration: none; }

.site-header {
    max-width: var(--container);
    margin: 0 auto;
    padding: 32px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.logo a {
    font-family: var(--font-serif);
    font-size: 22px;
    font-weight: 500;
    letter-spacing: 0.3em;
    color: var(--text-primary);
    transition: color 0.2s ease;
}
.logo a:hover { color: var(--accent); }

.primary-nav ul {
    list-style: none;
    display: flex;
    gap: 28px;
    align-items: center;
}

.primary-nav a {
    font-family: var(--font-serif);
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--text-primary);
    letter-spacing: 0.05em;
    transition: color 0.25s cubic-bezier(0.25, 1, 0.5, 1);
}
.primary-nav a:hover { color: var(--accent); }
.primary-nav .active a {
    color: var(--text-primary);
    font-weight: 500;
    text-decoration: underline;
    text-underline-offset: 4px;
}

.page-content {
    min-height: calc(100vh - 88px);
    max-width: var(--container);
    margin: 0 auto;
    padding: 8px 40px 40px;
    text-align: center;
}

.page-title {
    font-family: var(--font-serif);
    font-size: 1.6rem;
    font-weight: 500;
    letter-spacing: 0.4em;
    color: var(--text-primary);
    margin: 4px 0 6px;
}

.page-sub {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 0.85rem;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.deep-intro {
    font-family: var(--font-serif);
    font-size: 0.92rem;
    color: var(--text-muted);
    line-height: 1.8;
    margin: 0 auto 32px;
    max-width: 540px;
    letter-spacing: 0.03em;
}

.deep-grid {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 36px 28px;
    padding: 0;
    text-align: left;
}

.deep-card {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 24px 20px;
    border-top: 1px solid var(--line-subtle);
    transition: transform 0.25s cubic-bezier(0.25, 1, 0.5, 1);
}
.deep-card:hover { transform: translateY(-2px); }

.deep-tag {
    font-family: var(--font-serif);
    font-size: 0.72rem;
    letter-spacing: 0.25em;
    color: var(--text-muted);
    text-transform: uppercase;
}
.deep-title {
    font-family: var(--font-serif);
    font-size: 1.05rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    color: var(--text-primary);
    line-height: 1.4;
}
.deep-desc {
    font-family: var(--font-serif);
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.65;
}
.deep-meta {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 0.72rem;
    color: var(--text-muted);
    opacity: 0.7;
    margin-top: 4px;
}

.deep-empty {
    grid-column: 1 / -1;
    text-align: center;
    font-family: var(--font-serif);
    font-style: italic;
    color: var(--text-muted);
    padding: 40px 0;
    letter-spacing: 0.1em;
}

@media (max-width: 900px) {
    .site-header { padding: 24px 20px; }
    .primary-nav ul { gap: 18px; }
    .primary-nav a { font-size: 0.8rem; }
    .page-content { padding: 8px 20px 40px; }
    .deep-grid { gap: 28px 20px; }
}

@media (max-width: 600px) {
    .site-header { flex-direction: column; gap: 16px; padding: 20px 16px; }
    .logo a { font-size: 18px; }
    .primary-nav ul { gap: 14px; flex-wrap: wrap; justify-content: center; }
    .primary-nav a { font-size: 0.75rem; }
    .page-content { padding: 8px 16px 32px; }
    .deep-grid { grid-template-columns: 1fr; gap: 20px; }
    .page-title { font-size: 1.3rem; letter-spacing: 0.3em; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { transition-duration: 0.01ms !important; }
}