/* === Theme Variables === */

:root {
  --bg: #0f0f1a;
  --bg-card: rgba(255,255,255,0.03);
  --bg-card-hover: rgba(255,255,255,0.05);
  --bg-section: rgba(255,255,255,0.015);
  --bg-input: rgba(255,255,255,0.04);
  --bg-widget: rgba(255,255,255,0.02);
  --bg-tag: rgba(226,196,136,0.12);
  --bg-bubble: rgba(255,255,255,0.04);
  --bg-code: rgba(255,255,255,0.05);
  --bg-comment-btn: rgba(226,196,136,0.1);
  --bg-comment-btn-hover: rgba(226,196,136,0.18);
  --bg-sidebar-active: rgba(226,196,136,0.1);
  --bg-sidebar-hover: rgba(226,196,136,0.06);
  --bg-stat-liked: rgba(226,196,136,0.08);
  --bg-mermaid: rgba(15,15,26,0.6);
  --bg-nav: rgba(15,15,26,0.72);
  --bg-nav-scrolled: rgba(15,15,26,0.92);

  --border: rgba(255,255,255,0.06);
  --border-light: rgba(255,255,255,0.08);
  --border-accent: rgba(226,196,136,0.3);
  --border-accent-light: rgba(226,196,136,0.15);
  --border-accent-strong: rgba(226,196,136,0.4);
  --border-comment: rgba(226,196,136,0.2);
  --border-comment-hover: rgba(226,196,136,0.35);
  --border-input-focus: rgba(226,196,136,0.35);
  --border-mermaid: rgba(226,196,136,0.15);
  --border-bubble: rgba(255,255,255,0.06);
  --border-table: rgba(255,255,255,0.06);

  --text: #ccc;
  --text-dim: #999;
  --text-muted: #777;
  --text-subtle: #666;
  --text-faint: #555;
  --text-fainter: #444;
  --body-text: #ccc;

  --accent: #e2c488;
  --accent-text: #d4b66a;
  --accent-dim: #c4a86a;
  --accent-fade: #b8a06a;
  --accent-fill: #b89860;

  --accent-glow: rgba(226,196,136,0.5);
  --accent-glow-soft: rgba(226,196,136,0.4);
  --accent-glow-dim: rgba(226,196,136,0.3);
  --accent-glow-subtle: rgba(226,196,136,0.2);
  --accent-glow-micro: rgba(226,196,136,0.15);
  --accent-glow-nano: rgba(226,196,136,0.1);

  --shadow: rgba(0,0,0,0.3);
  --shadow-sm: rgba(0,0,0,0.25);
  --shadow-xs: rgba(0,0,0,0.2);

  --scrollbar-track: rgba(255,255,255,0.03);
  --scrollbar-thumb: rgba(226,196,136,0.2);
  --scrollbar-thumb-hover: rgba(226,196,136,0.35);

  --hero-grid: rgba(226,196,136,0.03);
  --hero-radial-1: rgba(226,196,136,0.06);
  --hero-radial-2: rgba(100,100,255,0.04);

  --bubble-accent-bg: rgba(100,180,255,0.08);
  --bubble-accent-border: rgba(100,180,255,0.15);
  --bubble-accent-text: #80b4e8;
  --bubble-warm-bg: rgba(226,150,100,0.08);
  --bubble-warm-border: rgba(226,150,100,0.15);
  --bubble-warm-text: #d4a080;

  --comment-del-hover: #c44;


  --bagua-gen: var(--bagua-gen);
  --bagua-gen-bg: var(--bagua-gen-bg);
  --bagua-xun: var(--bagua-xun);
  --bagua-xun-bg: var(--bagua-xun-bg);
  --bagua-li: var(--bagua-li);
  --bagua-li-bg: var(--bagua-li-bg);
  --bagua-kan: var(--bagua-kan);
  --bagua-kan-bg: var(--bagua-kan-bg);

  --taiji-bg: #0f0f1a;
  --taiji-light: #b89860;

  --theme-transition: background 0.4s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

[data-theme="light"] {
  --bg: #f9f7f1;
  --bg-card: rgba(0,0,0,0.03);
  --bg-card-hover: rgba(0,0,0,0.05);
  --bg-section: rgba(0,0,0,0.015);
  --bg-input: rgba(0,0,0,0.04);
  --bg-widget: rgba(0,0,0,0.02);
  --bg-tag: rgba(184,152,96,0.12);
  --bg-bubble: rgba(0,0,0,0.04);
  --bg-code: rgba(0,0,0,0.05);
  --bg-comment-btn: rgba(184,152,96,0.12);
  --bg-comment-btn-hover: rgba(184,152,96,0.2);
  --bg-sidebar-active: rgba(184,152,96,0.12);
  --bg-sidebar-hover: rgba(184,152,96,0.06);
  --bg-stat-liked: rgba(184,152,96,0.1);
  --bg-mermaid: rgba(249,247,241,0.85);
  --bg-nav: rgba(249,247,241,0.88);
  --bg-nav-scrolled: rgba(249,247,241,0.96);

  --border: rgba(0,0,0,0.08);
  --border-light: rgba(0,0,0,0.1);
  --border-accent: rgba(184,152,96,0.35);
  --border-accent-light: rgba(184,152,96,0.18);
  --border-accent-strong: rgba(184,152,96,0.4);
  --border-comment: rgba(184,152,96,0.25);
  --border-comment-hover: rgba(184,152,96,0.4);
  --border-input-focus: rgba(184,152,96,0.35);
  --border-mermaid: rgba(184,152,96,0.2);
  --border-bubble: rgba(0,0,0,0.06);
  --border-table: rgba(0,0,0,0.06);

  --text: #2c2c2c;
  --text-dim: #666;
  --text-muted: #888;
  --text-subtle: #999;
  --text-faint: #aaa;
  --text-fainter: #bbb;
  --body-text: #2c2c2c;

  --accent: #8b6914;
  --accent-text: #735510;
  --accent-dim: #8a6520;
  --accent-fade: #9a7530;
  --accent-fill: #8b6914;

  --accent-glow: rgba(139,105,20,0.25);
  --accent-glow-soft: rgba(139,105,20,0.2);
  --accent-glow-dim: rgba(139,105,20,0.15);
  --accent-glow-subtle: rgba(139,105,20,0.1);
  --accent-glow-micro: rgba(139,105,20,0.08);
  --accent-glow-nano: rgba(139,105,20,0.06);

  --shadow: rgba(0,0,0,0.06);
  --shadow-sm: rgba(0,0,0,0.05);
  --shadow-xs: rgba(0,0,0,0.04);

  --scrollbar-track: rgba(0,0,0,0.04);
  --scrollbar-thumb: rgba(184,152,96,0.3);
  --scrollbar-thumb-hover: rgba(184,152,96,0.4);

  --hero-grid: rgba(184,152,96,0.05);
  --hero-radial-1: rgba(184,152,96,0.1);
  --hero-radial-2: rgba(80,80,200,0.06);

  --bubble-accent-bg: rgba(60,120,200,0.1);
  --bubble-accent-border: rgba(60,120,200,0.18);
  --bubble-accent-text: #3c78c8;
  --bubble-warm-bg: rgba(200,120,60,0.1);
  --bubble-warm-border: rgba(200,120,60,0.18);
  --bubble-warm-text: #c8783c;

  --comment-del-hover: #c44;


  --bagua-gen: rgba(100,160,60,0.35);
  --bagua-gen-bg: rgba(100,160,60,0.06);
  --bagua-xun: rgba(140,100,200,0.35);
  --bagua-xun-bg: rgba(140,100,200,0.06);
  --bagua-li: rgba(200,80,80,0.35);
  --bagua-li-bg: rgba(200,80,80,0.06);
  --bagua-kan: rgba(60,130,180,0.35);
  --bagua-kan-bg: rgba(60,130,180,0.06);

  --taiji-bg: #f9f7f1;
  --taiji-light: #b89860;
}

/* Smooth theme transition */
body, .nav, .hero, .section, .footer, .project-card, .about-card, .bagua-card,
.bubble, .blog-card, .blog-scroll-card, .post-content, .comment-item,
.tag, .tag-filter-btn, input, select, textarea, button, .blog-scroll-wrapper,
.sidebar-cat-link, .toc-link, .post-widget, .stat-item, .toc-sticky, .meta-sticky {
  transition: var(--theme-transition);
}

/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
/* JetBrains Mono self-hosted */
@font-face {
  font-family: 'JetBrains Mono';
  src: url('fonts/JetBrainsMono-Regular.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'JetBrains Mono';
  src: url('fonts/JetBrainsMono-Medium.woff2') format('woff2');
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'JetBrains Mono';
  src: url('fonts/JetBrainsMono-Bold.woff2') format('woff2');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

body {
  font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--body-text);
  background: var(--bg);
  line-height: 1.8;
  overflow-x: clip;
}

/* === Typography === */
h1, h2, h3 { font-family: 'Noto Serif CJK SC', 'Source Han Serif SC', 'STSong', 'SimSun', 'Songti SC', serif; }
a { color: inherit; text-decoration: none; }

/* === Navigation === */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 1rem 2rem;
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  background: var(--bg-nav);
  border-bottom: 1px solid var(--border);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  animation: navIn 0.8s ease forwards;
}
@keyframes navIn { from { transform: translateY(-100%); } to { transform: translateY(0); } }
.nav.scrolled {
  padding: 0.6rem 2rem; background: var(--bg-nav-scrolled);
  box-shadow: 0 4px 30px var(--shadow);
}
.nav-inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-logo {
  font-family: 'Noto Serif CJK SC', 'Source Han Serif SC', 'STSong', 'SimSun', 'Songti SC', serif; font-size: 1.4rem; font-weight: 900;
  color: var(--accent);
  letter-spacing: 0.15em;
  transition: text-shadow 0.4s;
}
.nav-logo:hover { text-shadow: 0 0 20px var(--accent-glow); }
.nav-links { display: flex; gap: 2rem; }
.nav-links a {
  font-size: 0.9rem; font-weight: 500; color: var(--text);
  transition: color 0.3s, letter-spacing 0.3s; position: relative;
  padding: 0.2rem 0;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px;
  background: var(--accent); transition: width 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 1px;
}
.nav-links a:hover, .nav-links a.active { color: var(--accent); letter-spacing: 0.05em; }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }

/* Theme toggle */
.theme-toggle {
  background: none; border: 1px solid var(--border-light);
  border-radius: 50%; width: 34px; height: 34px;
  font-size: 1rem; cursor: pointer; display: flex; align-items: center;
  justify-content: center; transition: var(--theme-transition);
  padding: 0; line-height: 1;
  color: inherit;
}
.theme-toggle:hover {
  border-color: var(--accent);
  transform: rotate(15deg) scale(1.1);
}
.theme-toggle:active { transform: scale(0.9); transition: transform 0.1s; }

/* === Hero === */
.hero {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  position: relative; text-align: center;
  background: radial-gradient(ellipse at 50% 40%, var(--bg-sidebar-hover) 0%, transparent 60%),
              radial-gradient(ellipse at 80% 80%, var(--hero-radial-2) 0%, transparent 50%);
}
.hero-bg {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--hero-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--hero-grid) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.5;
}

/* === Center Taiji === */
.taiji-center {
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  z-index: 2;
  width: min(60vw, 60vh, 320px);
  height: min(60vw, 60vh, 320px);
  border-radius: 50%;
  background: linear-gradient(90deg, var(--accent-fill) 50%, var(--bg) 50%);
  box-shadow: 0 0 40px var(--accent-glow-subtle), 0 0 80px var(--bg-stat-liked);
  transition: opacity 0.6s ease;
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  outline: none;
}
.taiji-center:focus,
.taiji-center:focus-visible { outline: none; }
.taiji-center.done {
  pointer-events: none;
  cursor: default;
}
.taiji-center::before,
.taiji-center::after {
  content: ''; position: absolute;
  left: 50%; border-radius: 50%;
  transform: translateX(-50%);
}
.taiji-center::before {
  top: 0;
  width: 50%; height: 50%;
  background: radial-gradient(circle at 50% 50%, var(--bg) 18%, transparent 19%);
  background-color: var(--accent-fill);
}
.taiji-center::after {
  bottom: 0;
  width: 50%; height: 50%;
  background: radial-gradient(circle at 50% 50%, var(--accent-fill) 18%, transparent 19%);
  background-color: var(--bg);
}
.taiji-center:hover { box-shadow: 0 0 60px var(--accent-glow-dim), 0 0 120px var(--accent-glow-micro); }

/* === Corner Fragments === */
.taiji-frag {
  position: fixed;
  pointer-events: none;
  opacity: 0;
  filter: drop-shadow(0 0 10px var(--accent-glow));
}
.taiji-frag svg { display: block; }

.taiji-clear-frag {
  top: 72px; left: 20px;
  z-index: 120;
  width: min(60vw, 60vh, 320px); height: min(60vw, 60vh, 320px);
}

.taiji-dark-frag {
  bottom: 28px; right: 20px;
  z-index: 120;
  width: min(60vw, 60vh, 320px); height: min(60vw, 60vh, 320px);
}
@keyframes fragClearIn {
  from { transform: translate(-40px, -40px); opacity: 0; }
  to { transform: translate(0, 0); opacity: 0.5; }
}
@keyframes fragDarkIn {
  from { transform: translate(40px, 40px); opacity: 0; }
  to { transform: translate(0, 0); opacity: 0.5; }
}

/* Hero content reveal */
.hero-content {
  position: relative; z-index: 1;
  opacity: 0; transform: translateY(30px);
  transition: opacity 1s ease 0.5s, transform 1s ease 0.5s;
}
.hero-content.visible {
  opacity: 1; transform: translateY(0);
}
.hero-tagline {
  font-size: 1.2rem; color: var(--text-dim); font-weight: 300;
  letter-spacing: 0.3em; margin-bottom: 1rem;
}
.hero-sub {
  font-size: 1rem; color: var(--text-subtle); max-width: 480px;
  margin: 0 auto;
}

/* === Sections === */
.section { padding: 6rem 2rem; }
.section-dark { background: var(--bg-section); }
.section-title {
  text-align: center; font-size: 2rem; font-weight: 900;
  color: var(--accent); margin-bottom: 3rem;
  position: relative;
  transition: letter-spacing 0.5s;
}
.section-title::after {
  content: ''; display: block; width: 40px; height: 3px;
  background: var(--accent); margin: 1rem auto 0; border-radius: 2px;
  transition: width 0.5s ease;
}
.section-title:hover::after { width: 80px; }
.section-desc { text-align: center; color: var(--text-muted); margin-bottom: 2.5rem; margin-top: -2rem; }

/* === About === */
.about-grid {
  max-width: 1100px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}
.about-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 16px; padding: 2rem;
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), border-color 0.4s, box-shadow 0.4s, background 0.3s;
}
.about-card:hover {
  transform: translateY(-6px); border-color: var(--accent-glow-dim);
  box-shadow: 0 12px 40px var(--shadow);
  background: var(--bg-card-hover);
}
.about-card:active { transform: scale(0.98); transition: transform 0.1s; }
.card-icon { font-size: 2rem; margin-bottom: 1rem; }
.about-card h3 { font-size: 1.2rem; color: var(--accent); margin-bottom: 1rem; }
.about-card p { color: var(--text-dim); font-size: 0.95rem; line-height: 1.9; }

/* === Projects === */
.projects-grid {
  max-width: 1100px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}
.project-card {
  display: block; background: var(--bg-card);
  border: 1px solid var(--border); border-radius: 16px;
  padding: 2rem; cursor: pointer;
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), border-color 0.4s, box-shadow 0.4s, background 0.3s;
  position: relative; overflow: hidden;
}
.project-card::before {
  content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%;
  background: radial-gradient(circle at 80% 20%, var(--bg-sidebar-hover), transparent 60%);
  opacity: 0; transition: opacity 0.5s;
}
.project-card:hover {
  transform: translateY(-6px); border-color: var(--accent-glow-dim);
  box-shadow: 0 12px 40px var(--shadow);
  background: var(--bg-card-hover);
}
.project-card:hover::before { opacity: 1; }
.project-card:active { transform: scale(0.98); transition: transform 0.1s; }
.project-pending { opacity: 0.7; cursor: default; }
.project-pending:hover { border-color: var(--border); }
.project-header { display: flex; align-items: flex-start; gap: 1rem; margin-bottom: 1rem; }
.project-icon {
  font-size: 1.6rem; flex-shrink: 0; margin-top: 2px;
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  display: inline-block;
}
.project-card:hover .project-icon { transform: scale(1.2) rotate(-5deg); }
.project-header h3 { font-size: 1.15rem; color: var(--accent); margin-bottom: 0.4rem; }
.project-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.tag {
  font-size: 0.7rem; padding: 2px 10px; border-radius: 20px;
  background: var(--accent-glow-nano); color: var(--accent-dim);
  border: 1px solid var(--accent-glow-micro);
  font-family: 'JetBrains Mono', monospace;
}
.project-card p { font-size: 0.9rem; color: var(--text-dim); line-height: 1.7; margin-bottom: 1rem; }
.project-meta { display: flex; gap: 1.5rem; font-size: 0.8rem; color: var(--text-subtle); }
.more-link { text-align: center; margin-top: 2.5rem; }
.more-link a { color: var(--accent); font-size: 0.95rem; transition: opacity 0.3s; }
.more-link a:hover { opacity: 0.7; }

/* === Skills === */
.skills-grid {
  max-width: 1100px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}
.skill-group { padding: 0; }
.skill-group-title {
  font-size: 1rem; color: var(--accent); margin-bottom: 1rem;
  padding-left: 0.2rem;
}
.skill-bubbles { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.bubble {
  padding: 6px 16px; border-radius: 20px; font-size: 0.82rem;
  background: var(--bg-bubble); color: var(--text-dim);
  border: 1px solid var(--border);
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  cursor: default;
}
.bubble:hover {
  border-color: var(--accent-glow-dim); color: var(--accent);
  transform: translateY(-2px) scale(1.06);
  box-shadow: 0 4px 16px var(--accent-glow-nano);
}
.bubble.primary { background: var(--bg-stat-liked); color: var(--accent-text); border-color: var(--accent-glow-micro); }
.bubble.accent { background: var(--bubble-accent-bg); color: var(--bubble-accent-text); border-color: var(--bubble-accent-border); }
.bubble.warm { background: var(--bubble-warm-bg); color: var(--bubble-warm-text); border-color: var(--bubble-warm-border); }

/* === Bagua Grid === */
.bagua-grid {
  max-width: 1100px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 1.5rem;
}
.bagua-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 16px; padding: 1.8rem; text-align: center;
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), border-color 0.4s, box-shadow 0.4s, background 0.3s;
  cursor: default;
}
.bagua-card:hover { transform: translateY(-6px) scale(1.02); box-shadow: 0 12px 40px var(--shadow-sm); }
.bagua-symbol {
  font-size: 2.2rem; margin-bottom: 0.5rem; color: var(--accent);
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  display: inline-block;
}
.bagua-card:hover .bagua-symbol { transform: scale(1.25) rotate(8deg); }
.bagua-card h3 { font-size: 1.3rem; font-weight: 900; margin-bottom: 0.3rem; }
.bagua-card p { font-size: 0.85rem; color: var(--accent); margin-bottom: 0.5rem; }
.bagua-detail { display: block; font-size: 0.75rem; color: var(--text-subtle); line-height: 1.6; }

.bagua-card.qian:hover { border-color: var(--accent-glow-soft); background: var(--bg-card-hover); }
.bagua-card.kun:hover { border-color: var(--bubble-accent-border); background: var(--bubble-accent-bg); }
.bagua-card.gen:hover { border-color: var(--bagua-gen); background: var(--bagua-gen-bg); }
.bagua-card.xun:hover { border-color: var(--bagua-xun); background: var(--bagua-xun-bg); }
.bagua-card.li:hover { border-color: var(--bagua-li); background: var(--bagua-li-bg); }
.bagua-card.kan:hover { border-color: var(--bagua-kan); background: var(--bagua-kan-bg); }
.bagua-card.ji:hover { border-color: var(--accent-glow-soft); background: var(--bg-card-hover); }

/* === Footer === */
.footer {
  padding: 4rem 2rem; text-align: center;
  border-top: 1px solid var(--border);
}
.footer-inner { max-width: 600px; margin: 0 auto; }
.footer-name {
  font-family: 'Noto Serif CJK SC', 'Source Han Serif SC', 'STSong', 'SimSun', 'Songti SC', serif; font-size: 1.5rem; font-weight: 900;
  color: var(--accent); margin-bottom: 1rem;
  transition: text-shadow 0.4s;
}
.footer-name:hover { text-shadow: 0 0 20px var(--accent-glow-soft); }
.footer-quote { color: var(--text-subtle); font-size: 0.95rem; font-style: italic; }
.footer-cite { color: var(--text-faint); font-size: 0.8rem; margin-top: 0.3rem; margin-bottom: 2rem; }
.footer-links { display: flex; justify-content: center; gap: 1.2rem; color: var(--text-muted); font-size: 0.85rem; margin-bottom: 1rem; }
.footer-links a { color: var(--text-dim); transition: color 0.3s; }
.footer-links a:hover { color: var(--accent); }
.sep { color: var(--text-fainter); }
.loc { color: var(--text-subtle); }
.footer-copy { color: var(--text-fainter); font-size: 0.78rem; }
.footer-beian { margin-top: 0.4rem; font-size: 0.75rem; }
.footer-beian a { color: var(--text-fainter); text-decoration: none; transition: color 0.3s; }
.footer-beian a:hover { color: var(--accent); }

/* === Blog Scroll (homepage) === */
.blog-scroll-wrapper {
  max-width: 1100px; margin: 0 auto; padding: 0 2rem;
}
.blog-scroll {
  display: flex; gap: 1.2rem; overflow-x: auto; scroll-snap-type: x mandatory;
  scroll-behavior: smooth; padding-bottom: 1rem;
  -webkit-overflow-scrolling: touch;
}
.blog-scroll::-webkit-scrollbar { height: 6px; }
.blog-scroll::-webkit-scrollbar-track { background: var(--bg-card); border-radius: 3px; }
.blog-scroll::-webkit-scrollbar-thumb { background: var(--accent-glow-subtle); border-radius: 3px; }
.blog-scroll::-webkit-scrollbar-thumb:hover { background: var(--scrollbar-thumb-hover); }

.blog-scroll-card {
  flex: 0 0 320px; scroll-snap-align: start;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 14px; padding: 1.6rem;
  transition: border-color 0.4s, transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.4s, background 0.3s;
  display: flex; flex-direction: column; justify-content: space-between;
  position: relative;
}
.blog-scroll-card:hover {
  border-color: var(--accent-glow-dim); transform: translateY(-6px);
  box-shadow: 0 8px 30px var(--shadow-sm);
  background: var(--bg-card-hover);
}
.blog-scroll-card:active { transform: scale(0.97); transition: transform 0.1s; }
.blog-scroll-card h3 { font-size: 1.05rem; line-height: 1.5; margin-bottom: 0.6rem; position: relative; z-index: 1; }
.blog-scroll-card h3 a { color: var(--accent); transition: opacity 0.3s; }
.blog-scroll-card h3 a::after {
  content: ''; position: absolute; inset: 0;
}
.blog-scroll-card h3 a:hover { opacity: 0.85; }
.blog-scroll-card h3 a:focus-visible { outline: none; }
.blog-scroll-card .card-tags { display: flex; gap: 0.3rem; flex-wrap: wrap; margin-bottom: 0.5rem; }
.blog-scroll-card .card-date { color: var(--text-subtle); font-size: 0.78rem; margin-bottom: 0.4rem; }
.blog-scroll-card .card-summary { color: var(--accent-dim); font-size: 0.85rem; line-height: 1.7; flex: 1; }

/* === Animations === */
.fade-in {
  opacity: 0; transform: translateY(24px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.fade-in.visible {
  opacity: 1; transform: translateY(0);
}

/* Staggered entrance via CSS custom property */
section.section > * { transition-delay: var(--delay, 0ms); }

/* Section title drawn line on scroll */
.section-title::after {
  transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  width: 0;
}
.section-title.visible::after { width: 40px; }

/* === Responsive === */
@media (max-width: 768px) {
  .nav-links { gap: 1.2rem; }
  .section { padding: 4rem 1.2rem; }
  .about-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr; }
  .bagua-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
  .hero-tagline { font-size: 0.9rem; letter-spacing: 0.15em; }
}