/* ============================================
   Swiss Minimalist Design System
   Premium · Clean · Precise
   ============================================ */

:root {
  --c-bg: #FAFAF8;
  --c-surface: #FFFFFF;
  --c-text: #1C1C1E;
  --c-text-2: #86868B;
  --c-text-3: #AEAEB2;
  --c-accent: #2D5A3D;
  --c-accent-hover: #1E3D2A;
  --c-accent-light: #EEF4F0;
  --c-border: #E8E8ED;
  --c-warm: #B8926A;
  --c-code-bg: #F5F5F7;

  --font-display: "Playfair Display", Georgia, "Noto Serif SC", "Source Han Serif SC", serif;
  --font-body: "Inter", -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Cascadia Code", Consolas, monospace;

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;

  --ease: cubic-bezier(0.25, 0.1, 0.25, 1);
  --duration: 0.3s;

  --container: min(1200px, 85vw);
  --nav-height: 64px;
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.08);
  --shadow-hover: 0 12px 36px rgba(0,0,0,0.1);
}

/* === Reset === */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-text);
  background: var(--c-bg);
  min-height: 100vh;
  overflow-x: hidden;
}
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.01em;
}
a { color: var(--c-accent); text-decoration: none; transition: color var(--duration) var(--ease); }
a:hover { color: var(--c-accent-hover); }
img { max-width: 100%; height: auto; }
button { font-family: var(--font-body); }

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

/* === Navigation === */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: rgba(250, 250, 248, 0.88);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--c-border);
  z-index: 100;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.nav-logo {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--c-text);
  letter-spacing: -0.02em;
}
.nav-logo:hover { color: var(--c-accent); }
.nav-links { display: flex; align-items: center; gap: var(--space-xl); }
.nav-link {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 450;
  color: var(--c-text-2);
  padding: var(--space-sm) 0;
  position: relative;
  transition: color var(--duration) var(--ease);
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -1px; left: 0;
  width: 0; height: 2px;
  background: var(--c-accent);
  transition: width var(--duration) var(--ease);
}
.nav-link:hover, .nav-link.active { color: var(--c-text); }
.nav-link.active::after { width: 100%; }
.nav-icon { width: 16px; height: 16px; }
.nav-toggle {
  display: none;
  background: none; border: none;
  cursor: pointer; color: var(--c-text);
  padding: var(--space-sm);
}

/* === Main === */
.main {
  min-height: calc(100vh - var(--nav-height) - 80px);
  padding-top: calc(var(--nav-height) + var(--space-3xl));
  padding-bottom: var(--space-4xl);
}

/* === Footer === */
.footer { border-top: 1px solid var(--c-border); padding: var(--space-xl) 0; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; }
.footer-text { font-size: 13px; color: var(--c-text-3); }
.footer-links { display: flex; gap: var(--space-md); }
.footer-link {
  color: var(--c-text-3);
  display: flex; align-items: center;
  transition: color var(--duration) var(--ease);
}
.footer-link:hover { color: var(--c-text); }
.footer-link svg { width: 18px; height: 18px; }

/* === Animations === */
.page-enter { opacity: 0; transform: translateY(16px); }
.page-enter-active {
  opacity: 1; transform: translateY(0);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
.reveal {
  opacity: 0; transform: translateY(24px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal.stagger-1 { transition-delay: 0.08s; }
.reveal.stagger-2 { transition-delay: 0.16s; }
.reveal.stagger-3 { transition-delay: 0.24s; }

/* ===============================
   HOME
   =============================== */

/* Full-viewport hero */
.home-hero-fullscreen {
  min-height: calc(100vh - var(--nav-height) - var(--space-3xl));
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: relative;
  text-align: center;
  padding: 0 var(--space-lg);
  background:
    radial-gradient(ellipse 60% 50% at 20% 40%, rgba(45,90,61,0.06) 0%, transparent 70%),
    radial-gradient(ellipse 50% 60% at 80% 30%, rgba(184,146,106,0.06) 0%, transparent 70%),
    radial-gradient(ellipse 80% 40% at 50% 90%, rgba(45,90,61,0.03) 0%, transparent 60%);
  overflow: hidden;
}
.home-hero-fullscreen::before {
  content: '';
  position: absolute;
  top: -20%; left: -10%;
  width: 50%; height: 60%;
  background: radial-gradient(circle, rgba(45,90,61,0.05) 0%, transparent 70%);
  border-radius: 50%;
  filter: blur(60px);
  pointer-events: none;
}
.home-hero-fullscreen::after {
  content: '';
  position: absolute;
  bottom: -10%; right: -5%;
  width: 40%; height: 50%;
  background: radial-gradient(circle, rgba(184,146,106,0.05) 0%, transparent 70%);
  border-radius: 50%;
  filter: blur(60px);
  pointer-events: none;
}
.home-hero-inner {
  max-width: 640px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}
.home-greeting {
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--c-accent);
  margin-bottom: var(--space-lg);
}
.home-title {
  font-size: clamp(36px, 6vw, 56px);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: var(--space-lg);
  background: linear-gradient(135deg, var(--c-text) 0%, var(--c-accent) 60%, var(--c-warm) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.home-subtitle {
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-text-2);
  max-width: 480px;
  margin: 0 auto;
}

/* Decorative dots */
.home-hero-deco {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: var(--space-2xl);
}
.hero-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-accent);
  opacity: 0.3;
}
.hero-dot:nth-child(2) { opacity: 0.6; }
.hero-dot:nth-child(3) { opacity: 1; }

/* Scroll indicator */
.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--c-text-3);
  animation: scrollFade 2.5s ease-in-out infinite;
}
.scroll-text {
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-weight: 500;
}
.scroll-arrow {
  width: 24px;
  height: 24px;
  animation: scrollBounce 2s ease-in-out infinite;
}
.scroll-arrow svg { width: 24px; height: 24px; }

@keyframes scrollBounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(8px); }
}
@keyframes scrollFade {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

.home-divider {
  width: 48px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-accent), transparent);
  margin: var(--space-3xl) auto;
}
.home-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-xl);
}
.home-section-title {
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--c-text-3);
}
.home-section-link {
  font-size: 13px;
  font-weight: 500;
  color: var(--c-text-3);
  display: flex;
  align-items: center;
  gap: 4px;
  transition: color var(--duration) var(--ease);
}
.home-section-link:hover { color: var(--c-accent); }
.home-section-link svg { width: 14px; height: 14px; }

/* Featured Grid */
.featured-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-lg);
}
.article-card {
  background: var(--c-surface);
  border-radius: var(--radius);
  padding: var(--space-xl) var(--space-xl) var(--space-lg);
  border: 1px solid var(--c-border);
  transition: transform var(--duration) var(--ease),
              box-shadow var(--duration) var(--ease),
              border-color var(--duration) var(--ease);
  cursor: pointer;
  display: block;
  color: inherit;
}
.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: transparent;
  color: inherit;
}
.article-card-label {
  font-size: 11px;
  font-weight: 500;
  color: var(--c-accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-sm);
}
.article-card-title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: var(--space-sm);
  line-height: 1.4;
  font-family: var(--font-body);
}
.article-card-summary {
  font-size: 14px;
  color: var(--c-text-2);
  line-height: 1.6;
  margin-bottom: var(--space-md);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.article-card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-size: 13px;
  color: var(--c-text-3);
}
.article-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-md);
}
.tag-pill {
  font-size: 12px;
  padding: 2px 10px;
  border-radius: 100px;
  background: var(--c-accent-light);
  color: var(--c-accent);
  font-weight: 450;
  transition: all var(--duration) var(--ease);
}
.tag-pill:hover {
  background: var(--c-accent);
  color: #fff;
}

/* ===============================
   ARTICLES PAGE
   =============================== */
.articles-header {
  text-align: center;
  padding-bottom: var(--space-2xl);
  max-width: 580px;
  margin: 0 auto;
}
.articles-title {
  font-size: clamp(30px, 5vw, 48px);
  font-weight: 700;
  margin-bottom: var(--space-md);
}
.articles-subtitle {
  font-size: 16px;
  color: var(--c-text-2);
  line-height: 1.7;
  font-style: italic;
}

/* Word Cloud */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: baseline;
  gap: 6px var(--space-md);
  padding: var(--space-lg) 0 var(--space-2xl);
  max-width: 720px;
  margin: 0 auto;
}
.tag-cloud-item {
  cursor: pointer;
  font-weight: 450;
  color: var(--c-text-3);
  padding: 3px var(--space-sm);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  user-select: none;
  transition: all var(--duration) var(--ease);
}
.tag-cloud-item:hover { color: var(--c-accent); background: var(--c-accent-light); }
.tag-cloud-item.active { color: #fff; background: var(--c-accent); }
.tag-cloud-item.size-1 { font-size: 13px; }
.tag-cloud-item.size-2 { font-size: 16px; }
.tag-cloud-item.size-3 { font-size: 20px; font-weight: 500; }
.tag-cloud-item.size-4 { font-size: 25px; font-weight: 600; }
.tag-cloud-item.size-5 { font-size: 31px; font-weight: 700; font-family: var(--font-display); }

/* Search */
.search-section {
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--c-border);
  margin-bottom: var(--space-lg);
}
.search-bar {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 12px var(--space-lg);
  max-width: 460px;
  margin: 0 auto;
  transition: border-color var(--duration) var(--ease),
              box-shadow var(--duration) var(--ease);
}
.search-bar:focus-within {
  border-color: var(--c-accent);
  box-shadow: 0 0 0 3px var(--c-accent-light);
}
.search-bar svg { width: 18px; height: 18px; color: var(--c-text-3); flex-shrink: 0; }
.search-input {
  flex: 1;
  border: none; outline: none;
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--c-text);
  background: transparent;
}
.search-input::placeholder { color: var(--c-text-3); }
.search-clear {
  background: none; border: none;
  cursor: pointer; color: var(--c-text-3);
  padding: 2px; display: flex;
  opacity: 0; transition: opacity var(--duration) var(--ease);
}
.search-clear.visible { opacity: 1; }

.results-meta {
  text-align: center;
  font-size: 13px;
  color: var(--c-text-3);
  padding: var(--space-md) 0;
}

/* Timeline */
.timeline { padding: var(--space-md) 0; }
.timeline-year {
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--c-text-3);
  padding: var(--space-md) 0 var(--space-sm);
  border-bottom: 1px solid var(--c-border);
  margin-bottom: 0;
}
.timeline-item {
  display: flex;
  gap: var(--space-xl);
  padding: var(--space-lg) 0;
  border-bottom: 1px solid transparent;
  cursor: pointer;
  color: inherit;
  transition: border-color var(--duration) var(--ease);
}
.timeline-item:last-child { border-bottom: 1px solid var(--c-border); }
.timeline-item:hover { border-bottom-color: var(--c-border); }
.timeline-item:hover .timeline-title { color: var(--c-accent); }
.timeline-date {
  font-size: 13px;
  color: var(--c-text-3);
  min-width: 96px;
  padding-top: 3px;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}
.timeline-content { flex: 1; min-width: 0; }
.timeline-title {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 2px;
  transition: color var(--duration) var(--ease);
}
.timeline-summary {
  font-size: 14px;
  color: var(--c-text-2);
  line-height: 1.6;
  margin-bottom: var(--space-sm);
}
.timeline-tags { display: flex; flex-wrap: wrap; gap: var(--space-xs); }

.no-results {
  text-align: center;
  padding: var(--space-4xl) 0;
  color: var(--c-text-3);
}
.no-results svg { width: 48px; height: 48px; margin-bottom: var(--space-md); opacity: 0.25; }
.no-results p { font-size: 15px; }

/* ===============================
   ARTICLE DETAIL
   =============================== */
.article-header {
  margin: 0 auto var(--space-2xl);
}
.article-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--c-text-3);
  margin-bottom: var(--space-xl);
  transition: color var(--duration) var(--ease);
}
.article-back:hover { color: var(--c-accent); }
.article-back svg { width: 16px; height: 16px; }
.article-detail-label {
  font-size: 11px;
  font-weight: 500;
  color: var(--c-accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-md);
}
.article-detail-title {
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-md);
}
.article-detail-subtitle {
  font-size: 16px;
  color: var(--c-text-2);
  font-style: italic;
  line-height: 1.7;
  margin-bottom: var(--space-lg);
}
.article-detail-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-md);
  font-size: 13px;
  color: var(--c-text-3);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--c-border);
}
.article-detail-meta span { display: flex; align-items: center; gap: 4px; }
.article-detail-meta svg { width: 14px; height: 14px; }

/* Article Content Prose */
.article-content { margin: 0 auto; overflow-x: hidden; }
.article-content h1, .article-content h2, .article-content h3, .article-content h4 {
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
}
.article-content h1 { font-size: 26px; }
.article-content h2 { font-size: 22px; }
.article-content h3 { font-size: 18px; }
.article-content p { margin-bottom: var(--space-md); line-height: 1.8; }
.article-content ul, .article-content ol {
  margin-bottom: var(--space-md);
  padding-left: var(--space-xl);
}
.article-content li { margin-bottom: var(--space-sm); line-height: 1.7; }
.article-content blockquote {
  border-left: 3px solid var(--c-accent);
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-xl) 0;
  background: var(--c-accent-light);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  color: var(--c-text-2);
}
.article-content code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  padding: 2px 6px;
  background: var(--c-code-bg);
  border-radius: 4px;
}
.article-content pre {
  margin: var(--space-xl) 0;
  border-radius: var(--radius);
  overflow-x: auto;
}
.article-content pre code { padding: 0; background: none; }
.article-content a {
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(45,90,61,0.25);
  transition: text-decoration-color var(--duration);
}
.article-content a:hover { text-decoration-color: var(--c-accent); }
.article-content hr {
  border: none;
  border-top: 1px solid var(--c-border);
  margin: var(--space-2xl) 0;
}
.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-xl) 0;
  font-size: 14px;
}
.article-content th, .article-content td {
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--c-border);
  text-align: left;
}
.article-content th { font-weight: 600; }

/* Reading Progress */
.reading-progress {
  position: fixed;
  top: var(--nav-height);
  left: 0;
  width: 0;
  height: 2px;
  background: var(--c-accent);
  z-index: 99;
  transition: width 0.08s linear;
}

/* Math Display (KaTeX) */
.math-display {
  text-align: center;
  margin: var(--space-xl) 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.math-display .katex-display { margin: 0; }
.article-content .katex { font-size: 1.1em; }
.article-content .katex-display > .katex { font-size: 1.15em; }

/* Jupyter Notebook Viewer */
.nb-container { max-width: 100%; }
.nb-cell { margin-bottom: var(--space-lg); }
.nb-md-cell h1, .nb-md-cell h2, .nb-md-cell h3,
.nb-md-cell h4, .nb-md-cell h5, .nb-md-cell h6 {
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
}
.nb-md-cell h1 { font-size: 26px; }
.nb-md-cell h2 { font-size: 22px; }
.nb-md-cell h3 { font-size: 18px; }
.nb-md-cell p { margin-bottom: var(--space-md); line-height: 1.8; }
.nb-md-cell ul, .nb-md-cell ol { margin-bottom: var(--space-md); padding-left: var(--space-xl); }
.nb-md-cell li { margin-bottom: var(--space-sm); line-height: 1.7; }
.nb-md-cell blockquote {
  border-left: 3px solid var(--c-accent);
  padding: var(--space-sm) var(--space-lg);
  margin: var(--space-md) 0;
  background: var(--c-accent-light);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--c-text-2);
}
.nb-md-cell code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  padding: 2px 6px;
  background: var(--c-code-bg);
  border-radius: 4px;
}
.nb-md-cell pre { margin: var(--space-md) 0; border-radius: var(--radius); overflow-x: auto; }
.nb-md-cell pre code { padding: 0; background: none; }
.nb-md-cell table { width: 100%; border-collapse: collapse; margin: var(--space-md) 0; font-size: 14px; }
.nb-md-cell th, .nb-md-cell td { padding: var(--space-sm) var(--space-md); border-bottom: 1px solid var(--c-border); text-align: left; }
.nb-md-cell th { font-weight: 600; }
.nb-md-cell hr { border: none; border-top: 1px solid var(--c-border); margin: var(--space-xl) 0; }
.nb-md-cell a { text-decoration: underline; text-underline-offset: 3px; text-decoration-color: rgba(45,90,61,0.25); }

.nb-code-cell {
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--c-surface);
}
.nb-cell-label {
  display: block;
  padding: var(--space-xs) var(--space-md);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--c-text-3);
  background: var(--c-code-bg);
  letter-spacing: 0.5px;
  text-transform: uppercase;
  border-bottom: 1px solid var(--c-border);
}
.nb-out-label {
  border-top: 1px solid var(--c-border);
  background: transparent;
}
.nb-source {
  margin: 0;
  border-radius: 0;
}
.nb-source code {
  display: block;
  padding: var(--space-md);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  overflow-x: auto;
}
.nb-output {
  padding: 0;
}
.nb-stream, .nb-error {
  margin: 0;
  padding: var(--space-md);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
  background: var(--c-surface);
  border-radius: 0;
}
.nb-error {
  color: #DC2626;
  background: #FEF2F2;
}
.nb-img {
  display: block;
  max-width: 100%;
  margin: var(--space-md) auto;
}
.nb-rich {
  padding: var(--space-md);
  overflow-x: auto;
}

/* ===============================
   ABOUT PAGE
   =============================== */
.about-layout { max-width: 720px; margin: 0 auto; }
.about-hero {
  text-align: center;
  padding-bottom: var(--space-2xl);
  margin-bottom: var(--space-2xl);
  border-bottom: 1px solid var(--c-border);
}
.about-avatar {
  width: 72px; height: 72px;
  border-radius: 50%;
  background: var(--c-accent-light);
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto var(--space-lg);
  color: var(--c-accent);
}
.about-avatar svg { width: 32px; height: 32px; }
.about-name { font-size: 28px; font-weight: 700; margin-bottom: 4px; }
.about-tagline {
  font-size: 14px;
  color: var(--c-text-2);
  letter-spacing: 0.02em;
  margin-bottom: var(--space-sm);
}
.about-status {
  font-size: 13px;
  color: var(--c-accent);
  font-weight: 500;
  letter-spacing: 0.01em;
  margin-bottom: var(--space-lg);
  padding: 4px 12px;
  background: var(--c-accent-light);
  border-radius: 20px;
  display: inline-block;
}
.about-bio {
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-text-2);
  max-width: 520px;
  margin: 0 auto;
}

.about-section { margin-bottom: var(--space-3xl); }
.about-section-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--c-text-3);
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--c-border);
}

/* Skills Grid */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-md);
}
.skill-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: var(--space-lg);
  transition: border-color var(--duration) var(--ease), box-shadow var(--duration) var(--ease);
}
.skill-card:hover { border-color: rgba(45,90,61,0.2); box-shadow: var(--shadow); }
.skill-card-icon { width: 28px; height: 28px; color: var(--c-accent); margin-bottom: var(--space-md); }
.skill-card-title {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 4px;
  font-family: var(--font-body);
}
.skill-card-desc { font-size: 13px; color: var(--c-text-2); line-height: 1.5; }

/* AI Stack */
.ai-stack-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
}
.ai-stack-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: var(--space-xl);
  position: relative;
  overflow: hidden;
  transition: border-color var(--duration) var(--ease), box-shadow var(--duration) var(--ease);
}
.ai-stack-card:hover { box-shadow: var(--shadow); border-color: transparent; }
.ai-stack-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-accent), var(--c-warm));
}
.ai-stack-card-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
  font-family: var(--font-body);
}
.ai-stack-card-desc {
  font-size: 14px;
  color: var(--c-text-2);
  line-height: 1.6;
  margin-bottom: var(--space-md);
}
.ai-stack-tags { display: flex; flex-wrap: wrap; gap: var(--space-xs); }

/* Contact */
.contact-grid { display: flex; gap: var(--space-md); flex-wrap: wrap; }
.contact-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 12px var(--space-lg);
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--c-text);
  transition: all var(--duration) var(--ease);
}
.contact-link:hover {
  border-color: var(--c-accent); color: var(--c-accent);
  box-shadow: var(--shadow);
}
.contact-link svg { width: 18px; height: 18px; }

/* === Links (友链) === */
.links-header {
  text-align: center;
  padding: calc(var(--nav-height) + var(--space-3xl)) 0 var(--space-2xl);
}
.links-title {
  font-size: clamp(28px, 5vw, 40px);
  font-weight: 700;
  margin-bottom: var(--space-sm);
}
.links-subtitle {
  font-size: 15px;
  color: var(--c-text-2);
}
.links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
  padding-bottom: var(--space-4xl);
}
.link-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  transition: all var(--duration) var(--ease);
}
.link-card:hover {
  border-color: var(--c-accent);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}
.link-card-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--c-accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  color: var(--c-accent);
}
.link-card-icon svg { width: 22px; height: 22px; }
.link-card-name {
  font-size: 16px;
  font-weight: 600;
  font-family: var(--font-body);
  margin-bottom: var(--space-xs);
  color: var(--c-text);
}
.link-card:hover .link-card-name { color: var(--c-accent); }
.link-card-desc {
  font-size: 13px;
  color: var(--c-text-2);
  line-height: 1.5;
  margin-bottom: var(--space-sm);
}
.link-card-url {
  font-size: 12px;
  color: var(--c-text-3);
  font-family: var(--font-mono);
}

/* ===============================
   RESOURCE STORY (generated HTML)
   =============================== */
.resource-intro-panel {
  padding: var(--space-lg) 0 var(--space-2xl);
  border-bottom: 1px solid var(--c-border);
  margin-bottom: var(--space-2xl);
}
.resource-kicker {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--c-accent);
  margin-bottom: var(--space-md);
  display: block;
}
.resource-intro-panel h2 {
  font-size: clamp(19px, 3vw, 26px);
  margin-bottom: var(--space-md);
  line-height: 1.45;
}
.resource-intro-panel p {
  font-size: 15px;
  color: var(--c-text-2);
  line-height: 1.7;
}

/* Metric Grid */
.resource-metric-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
}
.resource-metric-card {
  text-align: center;
  padding: var(--space-lg);
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
}
.resource-metric-card span {
  display: block;
  font-size: 11px;
  color: var(--c-text-3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-xs);
}
.resource-metric-card strong {
  font-size: 28px;
  font-family: var(--font-display);
  color: var(--c-text);
}

/* Download Shelf */
.resource-download-shelf { margin-bottom: var(--space-2xl); }
.resource-section-head { margin-bottom: var(--space-lg); }
.resource-section-head span {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--c-accent);
  display: block;
  margin-bottom: 2px;
}
.resource-section-head h3 { font-size: 17px; font-weight: 600; }
.download-shelf-grid { display: grid; gap: var(--space-md); }
.download-shelf-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) var(--space-xl);
  background: var(--c-accent-light);
  border: 1px solid rgba(45,90,61,0.12);
  border-radius: var(--radius);
  color: var(--c-text);
  transition: all var(--duration) var(--ease);
}
.download-shelf-item:hover {
  background: var(--c-accent);
  color: #fff;
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}
.download-shelf-label {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  opacity: 0.6;
  display: block;
  margin-bottom: 2px;
}
.download-shelf-item strong { font-size: 14px; font-weight: 600; }
.download-shelf-action {
  font-size: 13px;
  font-weight: 500;
  opacity: 0.7;
  flex-shrink: 0;
}

/* Focus Grid */
.resource-focus-grid { margin-bottom: var(--space-2xl); }
.resource-focus-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--space-md);
}
.resource-focus-card {
  padding: var(--space-lg);
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
}
.resource-focus-index {
  font-size: 26px;
  font-family: var(--font-display);
  color: var(--c-accent);
  font-weight: 700;
  display: block;
  margin-bottom: var(--space-sm);
  line-height: 1;
}
.resource-focus-card p { font-size: 14px; color: var(--c-text-2); line-height: 1.6; }

/* File Grid */
.resource-index-section { margin-bottom: var(--space-2xl); }
.resource-file-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-md);
}
.resource-file-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: var(--space-lg);
  transition: border-color var(--duration) var(--ease), box-shadow var(--duration) var(--ease);
}
.resource-file-card:hover { border-color: rgba(45,90,61,0.2); box-shadow: var(--shadow); }
.resource-file-card.has-download { border-left: 3px solid var(--c-accent); }
.resource-file-meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}
.resource-file-type {
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--c-text-3);
}
.resource-pill {
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 100px;
  background: var(--c-accent);
  color: #fff;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.resource-file-card h3 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: var(--space-sm);
  font-family: var(--font-body);
}
.resource-file-card p {
  font-size: 13px;
  color: var(--c-text-2);
  line-height: 1.5;
  margin-bottom: var(--space-md);
}
.resource-file-actions { display: flex; gap: var(--space-md); }
.resource-action-link {
  font-size: 13px;
  font-weight: 500;
  color: var(--c-accent);
  transition: color var(--duration) var(--ease);
}
.resource-action-link:hover { color: var(--c-accent-hover); }

/* Theme Colors */
.theme-ai .resource-kicker,
.theme-ai .resource-focus-index { color: #6366F1; }
.theme-network .resource-kicker,
.theme-network .resource-focus-index { color: #0891B2; }
.theme-engineering .resource-kicker,
.theme-engineering .resource-focus-index { color: #B45309; }
.theme-data .resource-kicker,
.theme-data .resource-focus-index { color: #059669; }
.theme-business .resource-kicker,
.theme-business .resource-focus-index { color: #7C3AED; }
.theme-vr .resource-kicker,
.theme-vr .resource-focus-index { color: #DB2777; }
.theme-vision .resource-kicker,
.theme-vision .resource-focus-index { color: #D97706; }
.theme-career .resource-kicker,
.theme-career .resource-focus-index { color: var(--c-warm); }
.theme-security .resource-kicker,
.theme-security .resource-focus-index { color: #DC2626; }

/* ===============================
   SUB-FILE READER
   =============================== */
.sub-file-reader { margin: 0 auto; }
.sub-reader-sentinel { height: 0; width: 100%; pointer-events: none; }
.sub-reader-header {
  position: sticky;
  top: var(--nav-height);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-sm) calc(50vw - 50%);
  margin-left: calc(-50vw + 50%);
  margin-right: calc(-50vw + 50%);
  margin-bottom: var(--space-xl);
  background: var(--c-bg);
  border: none;
  border-bottom: 1px solid var(--c-border);
  z-index: 50;
  transition: background var(--duration) var(--ease),
              box-shadow var(--duration) var(--ease);
}
.sub-reader-header.stuck {
  background: rgba(250, 250, 248, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-sm);
}
.sub-reader-close {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--c-text-3);
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs) 0;
  transition: color var(--duration) var(--ease);
  font-family: var(--font-body);
  white-space: nowrap;
}
.sub-reader-close:hover { color: var(--c-accent); }
.sub-reader-close svg { width: 14px; height: 14px; }
.sub-reader-title {
  font-size: 13px;
  font-weight: 500;
  color: var(--c-text-3);
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.sub-reader-iframe {
  width: 100%;
  min-height: 80vh;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  background: #fff;
}

/* ===============================
   MOBILE RESPONSIVE
   =============================== */
.mobile-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 99;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration) var(--ease);
}
.mobile-overlay.open { opacity: 1; pointer-events: auto; }

@media (max-width: 768px) {
  :root { --nav-height: 56px; }

  .nav-toggle {
    display: flex; align-items: center; justify-content: center;
  }
  .nav-links {
    position: fixed;
    top: 0; right: 0; bottom: 0;
    width: 240px;
    background: var(--c-surface);
    flex-direction: column;
    align-items: flex-start;
    padding: calc(var(--nav-height) + var(--space-xl)) var(--space-xl);
    gap: 4px;
    transform: translateX(100%);
    transition: transform var(--duration) var(--ease);
    box-shadow: var(--shadow-lg);
    z-index: 100;
  }
  .nav-links.open { transform: translateX(0); }
  .nav-link {
    font-size: 15px;
    padding: var(--space-md) 0;
    width: 100%;
  }
  .nav-link::after { display: none; }

  .main { padding-top: calc(var(--nav-height) + var(--space-xl)); }
  .home-hero-fullscreen { min-height: calc(100svh - var(--nav-height) - var(--space-xl)); }
  .featured-grid { grid-template-columns: 1fr; }
  .timeline-item { flex-direction: column; gap: var(--space-sm); }
  .timeline-date { min-width: unset; }
  .resource-metric-grid { grid-template-columns: 1fr; }
  .resource-file-grid { grid-template-columns: 1fr; }
  .resource-focus-cards { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr; }
  .ai-stack-grid { grid-template-columns: 1fr; }
  .download-shelf-item {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }
  .footer-inner {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }
}

@media (max-width: 480px) {
  .container { padding: 0 var(--space-md); }
  .article-card { padding: var(--space-lg); }
  .contact-grid { flex-direction: column; }
  .contact-link { justify-content: center; }
}