/* ==========================================================================
   陈浩锟 / 垂野 — personal site
   Design: warm-paper editorial x technical minimalism.
   No frameworks, no build step — just this file.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Noto+Serif+SC:wght@600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root{
  --paper: #F5F1E8;
  --paper-raised: #EFE9DA;
  --ink: #17140F;
  --ink-soft: #55503F;
  --ink-faint: #8A8371;
  --rule: #DCD3BC;
  --rule-strong: #C7BB9E;
  --accent: #C1440E;
  --accent-ink: #FBEFE6;
  --teal: #2F6F5E;
  --surface: #FFFFFF;

  --font-display: 'Noto Serif SC', 'Space Grotesk', serif;
  --font-latin: 'Space Grotesk', sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB',
               'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  --max-w: 920px;
  --edge: clamp(24px, 6vw, 64px);

  color-scheme: light;
}

:root[data-theme="dark"]{
  --paper: #15140F;
  --paper-raised: #1D1B14;
  --ink: #F2ECD9;
  --ink-soft: #C6BEA5;
  --ink-faint: #837C68;
  --rule: #35311F;
  --rule-strong: #4A4530;
  --accent: #E2723A;
  --accent-ink: #201306;
  --teal: #5BA391;
  --surface: #1A1810;
  color-scheme: dark;
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }

body{
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  transition: background .25s ease, color .25s ease;
}

a{ color: inherit; text-decoration: none; }
img{ max-width: 100%; display: block; }

::selection{ background: var(--accent); color: var(--accent-ink); }

.wrap{
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--edge);
}

/* ---- noise texture, very subtle, purely decorative ---- */
.grain{
  position: fixed; inset: 0; pointer-events: none; z-index: 2000;
  opacity: .035; mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
:root[data-theme="dark"] .grain{ opacity: .06; mix-blend-mode: overlay; }

/* ---------------------------------- header ---------------------------------- */
.site-header{
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(10px) saturate(1.1);
  border-bottom: 1px solid var(--rule);
}
.site-header .wrap{
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.brand{
  font-family: var(--font-latin);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: .01em;
  display: flex; align-items: center; gap: 10px;
  cursor: pointer;
}
.brand .dot{
  width: 8px; height: 8px; border-radius: 999px; background: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}
.header-right{ display: flex; align-items: center; gap: 18px; }
.nav{ display: flex; align-items: center; gap: 28px; }
.nav a{
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--ink-soft);
  position: relative;
  padding: 4px 0;
  cursor: pointer;
}
.nav a:hover, .nav a.active{ color: var(--ink); }
.nav a.active::after{
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 2px;
  background: var(--accent);
}
.theme-toggle{
  width: 34px; height: 34px; border-radius: 999px;
  border: 1px solid var(--rule-strong); background: transparent;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; color: var(--ink-soft);
  transition: border-color .2s ease, color .2s ease, transform .2s ease;
}
.theme-toggle:hover{ color: var(--ink); border-color: var(--ink-soft); }
.theme-toggle svg{ width: 16px; height: 16px; }
.theme-toggle .i-sun{ display: none; }
:root[data-theme="dark"] .theme-toggle .i-moon{ display: none; }
:root[data-theme="dark"] .theme-toggle .i-sun{ display: block; }

.menu-btn{ display: none; background: none; border: none; cursor: pointer; padding: 6px; color: var(--ink); }
.menu-btn svg{ width: 22px; height: 22px; }

@media (max-width: 720px){
  .nav{
    position: absolute; top: 100%; left: 0; right: 0;
    height: calc(100vh - 68px);
    background: var(--paper);
    flex-direction: column; align-items: flex-start; gap: 0;
    padding: 8px var(--edge) 24px;
    transform: translateY(-8px); opacity: 0; visibility: hidden;
    transition: opacity .2s ease, transform .2s ease, visibility .2s;
    border-bottom: 1px solid var(--rule);
    overflow-y: auto;
  }
  .nav.open{ opacity: 1; transform: translateY(0); visibility: visible; }
  .nav a{ width: 100%; padding: 14px 0; border-bottom: 1px solid var(--rule); font-size: 14px; }
  .nav .theme-toggle{ margin-top: 10px; }
  .menu-btn{ display: flex; }
}

/* ---------------------------------- footer ---------------------------------- */
.site-footer{
  border-top: 1px solid var(--rule);
  margin-top: 96px;
}
.site-footer .wrap{
  padding-top: 40px; padding-bottom: 48px;
  display: flex; justify-content: space-between; align-items: baseline; gap: 24px;
  flex-wrap: wrap;
}
.site-footer .aliases{ font-family: var(--font-mono); font-size: 12.5px; color: var(--ink-faint); }
.footer-links{ display: flex; gap: 20px; }
.footer-links a{
  font-family: var(--font-mono); font-size: 12.5px; color: var(--ink-soft);
  text-transform: uppercase; letter-spacing: .04em;
}
.footer-links a:hover{ color: var(--accent); }

/* ---------------------------------- headings / prose ---------------------------------- */
h1, h2, h3{ font-family: var(--font-display); font-weight: 700; color: var(--ink); letter-spacing: -.01em; }
.eyebrow{
  font-family: var(--font-mono); font-size: 12.5px; letter-spacing: .12em; text-transform: uppercase;
  color: var(--accent);
  display: inline-flex; align-items: center; gap: 8px;
}
.eyebrow::before{ content: ""; width: 20px; height: 1px; background: var(--accent); }

/* ---------------------------------- buttons ---------------------------------- */
.btn{
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 13px; letter-spacing: .03em;
  padding: 12px 20px; border-radius: 2px;
  border: 1px solid var(--ink); color: var(--ink);
  cursor: pointer; transition: background .2s ease, color .2s ease, transform .15s ease;
}
.btn:hover{ background: var(--ink); color: var(--paper); }
.btn:active{ transform: translateY(1px); }
.btn.primary{ background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.primary:hover{ background: color-mix(in srgb, var(--accent) 85%, black); border-color: color-mix(in srgb, var(--accent) 85%, black); }

/* ---------------------------------- reveal on scroll ---------------------------------- */
.reveal{ opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in{ opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce){
  .reveal{ opacity: 1; transform: none; transition: none; }
  html{ scroll-behavior: auto; }
}

/* ==========================================================================
   Home
   ========================================================================== */
.hero{
  padding: 88px 0 64px;
  border-bottom: 1px solid var(--rule);
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
  align-items: end;
}
.hero h1{
  font-size: clamp(38px, 5.4vw, 60px);
  line-height: 1.12;
  margin: 18px 0 20px;
}
.hero h1 em{
  font-style: normal; color: var(--accent);
}
.hero .lede{
  font-size: 17px; color: var(--ink-soft); max-width: 46ch; margin: 0 0 26px;
}
.hero .actions{ display: flex; gap: 12px; flex-wrap: wrap; }

.hero-side{
  display: flex; flex-direction: column; align-items: flex-start; gap: 14px;
  border-left: 1px solid var(--rule);
  padding-left: 28px;
}
.hero-side .avatar{
  width: 84px; height: 84px; border-radius: 6px; overflow: hidden;
  border: 1px solid var(--rule-strong);
  filter: sepia(.12) contrast(1.02);
}
.hero-side .avatar img{ width: 100%; height: 100%; object-fit: cover; }
.hero-side .role{ font-family: var(--font-mono); font-size: 12.5px; color: var(--ink-faint); line-height: 1.6; }
.hero-side .role b{ color: var(--ink-soft); font-weight: 500; }

@media (max-width: 760px){
  .hero{ grid-template-columns: 1fr; padding-top: 56px; }
  .hero-side{ border-left: none; padding-left: 0; border-top: 1px solid var(--rule); padding-top: 20px; flex-direction: row; align-items: center; }
}

.section{ padding: 64px 0; border-bottom: 1px solid var(--rule); }
.section:last-of-type{ border-bottom: none; }
.section-head{
  display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 32px; gap: 16px; flex-wrap: wrap;
}
.section-head h2{ font-size: 26px; margin: 6px 0 0; }
.section-head .see-all{ font-family: var(--font-mono); font-size: 12.5px; color: var(--ink-soft); white-space: nowrap; }
.section-head .see-all:hover{ color: var(--accent); }

.focus-grid{ display: grid; gap: 28px; }
.focus-item{
  display: grid; grid-template-columns: 100px 1fr; gap: 20px;
  padding: 22px 0; border-top: 1px solid var(--rule);
}
.focus-item:first-child{ border-top: none; padding-top: 0; }
.focus-item .num{ font-family: var(--font-mono); color: var(--ink-faint); font-size: 13px; padding-top: 3px; }
.focus-item h3{ font-size: 18px; margin: 0 0 6px; font-family: var(--font-body); font-weight: 600; }
.focus-item p{ margin: 0; color: var(--ink-soft); font-size: 15px; }

.post-list{ display: flex; flex-direction: column; }
.post-row{
  display: grid; grid-template-columns: 108px 1fr auto; gap: 20px; align-items: baseline;
  padding: 20px 0; border-top: 1px solid var(--rule);
  cursor: pointer;
}
.post-list .post-row:first-child{ border-top: none; }
.post-row .date{ font-family: var(--font-mono); font-size: 12.5px; color: var(--ink-faint); }
.post-row .title{ font-size: 17px; font-weight: 600; transition: color .15s ease; }
.post-row .arrow{ opacity: 0; transform: translateX(-4px); transition: all .18s ease; color: var(--accent); }
.post-row:hover .title{ color: var(--accent); }
.post-row:hover .arrow{ opacity: 1; transform: translateX(0); }
.post-row .tag{
  font-family: var(--font-mono); font-size: 11px; color: var(--teal);
  border: 1px solid color-mix(in srgb, var(--teal) 40%, transparent);
  padding: 2px 7px; border-radius: 999px; text-transform: uppercase; letter-spacing: .04em;
  margin-top: 6px; display: inline-block;
}
@media (max-width: 620px){
  .post-row{ grid-template-columns: 1fr auto; }
  .post-row .date{ grid-row: 2; grid-column: 1 / -1; order: 2; }
}

.contact-panel{
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px;
  background: var(--rule); border: 1px solid var(--rule); margin-top: 8px;
}
.contact-panel a{
  background: var(--paper); padding: 22px 20px; display: flex; flex-direction: column; gap: 6px;
  transition: background .15s ease;
}
.contact-panel a:hover{ background: var(--paper-raised); }
.contact-panel .k{ font-family: var(--font-mono); font-size: 11px; text-transform: uppercase; letter-spacing: .08em; color: var(--ink-faint); }
.contact-panel .v{ font-size: 15px; font-weight: 500; }
@media (max-width: 620px){ .contact-panel{ grid-template-columns: 1fr; } }

/* ==========================================================================
   Post index / archive
   ========================================================================== */
.page-head{ padding: 72px 0 40px; }
.page-head h1{ font-size: clamp(32px, 4.6vw, 46px); margin: 16px 0 10px; }
.page-head p{ color: var(--ink-soft); max-width: 56ch; margin: 0; }

/* ==========================================================================
   Article
   ========================================================================== */
.article-head{ padding: 64px 0 40px; border-bottom: 1px solid var(--rule); }
.article-head h1{ font-size: clamp(30px, 4.4vw, 44px); line-height: 1.2; margin: 16px 0 20px; }
.article-meta{
  display: flex; gap: 18px; flex-wrap: wrap; align-items: center;
  font-family: var(--font-mono); font-size: 12.5px; color: var(--ink-faint);
}
.article-meta .sep{ width: 4px; height: 4px; border-radius: 999px; background: var(--rule-strong); }

.prose{ padding: 48px 0 24px; font-size: 17.5px; }
.prose h2{ font-size: 24px; margin: 46px 0 16px; }
.prose h3{ font-size: 19px; margin: 34px 0 14px; font-family: var(--font-body); font-weight: 700; }
.prose p{ margin: 0 0 20px; color: var(--ink); }
.prose p, .prose li{ color: color-mix(in srgb, var(--ink) 92%, var(--ink-soft)); }
.prose strong{ color: var(--ink); font-weight: 700; }
.prose ul, .prose ol{ margin: 0 0 20px; padding-left: 22px; }
.prose li{ margin-bottom: 8px; }
.prose hr{ border: none; border-top: 1px solid var(--rule); margin: 40px 0; }
.prose a.inline-link{ color: var(--accent); border-bottom: 1px solid color-mix(in srgb, var(--accent) 40%, transparent); }
.prose blockquote{
  margin: 24px 0; padding: 4px 0 4px 20px; border-left: 2px solid var(--accent);
  color: var(--ink-soft); font-style: normal;
}
.callout{
  background: var(--paper-raised); border: 1px solid var(--rule);
  padding: 18px 20px; border-radius: 3px; margin: 28px 0; font-size: 15px; color: var(--ink-soft);
}
.callout .eyebrow{ margin-bottom: 8px; }

.post-footer{ padding: 32px 0 8px; border-top: 1px solid var(--rule); margin-top: 24px; }
.post-footer .tags{ display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 18px; }
.post-footer .tags span{
  font-family: var(--font-mono); font-size: 11px; text-transform: uppercase; letter-spacing: .04em;
  color: var(--teal); border: 1px solid color-mix(in srgb, var(--teal) 40%, transparent);
  padding: 3px 8px; border-radius: 999px;
}
.post-footer .license{ font-size: 13px; color: var(--ink-faint); }
.post-footer .license a{ color: var(--ink-soft); text-decoration: underline; }

/* ==========================================================================
   Resume
   ========================================================================== */
.resume-header{
  padding: 72px 0 32px;
  display: flex; justify-content: space-between; align-items: flex-start; gap: 24px; flex-wrap: wrap;
}
.resume-header h1{ font-size: clamp(32px, 4.6vw, 46px); margin: 14px 0 10px; }
.resume-header .role{ font-size: 16px; color: var(--ink-soft); margin: 0; }
.resume-actions{ display: flex; gap: 10px; flex-wrap: wrap; }

.resume-meta{
  display: grid; grid-template-columns: repeat(4, auto); gap: 22px;
  padding: 22px 0 48px; border-bottom: 1px solid var(--rule);
  font-family: var(--font-mono); font-size: 12.5px; color: var(--ink-soft);
}
.resume-meta a:hover{ color: var(--accent); }
@media (max-width: 720px){ .resume-meta{ grid-template-columns: repeat(2, auto); } }

.resume-section{ padding: 44px 0; border-bottom: 1px solid var(--rule); }
.resume-section:last-child{ border-bottom: none; }
.resume-section > .eyebrow{ margin-bottom: 18px; }
.resume-section h2{ font-size: 22px; margin: 0 0 24px; }

.skill-grid{ display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.skill-grid div .k{ font-family: var(--font-mono); font-size: 11.5px; color: var(--accent); text-transform: uppercase; letter-spacing: .06em; margin-bottom: 8px; }
.skill-grid div .v{ font-size: 14.5px; color: var(--ink-soft); line-height: 1.6; }
@media (max-width: 720px){ .skill-grid{ grid-template-columns: 1fr; } }

.job{ margin-bottom: 40px; }
.job:last-child{ margin-bottom: 0; }
.job-head{ display: flex; justify-content: space-between; align-items: baseline; gap: 16px; margin-bottom: 4px; flex-wrap: wrap; }
.job-head h3{ font-size: 19px; margin: 0; font-family: var(--font-body); font-weight: 700; }
.job-head .period{ font-family: var(--font-mono); font-size: 12.5px; color: var(--ink-faint); white-space: nowrap; }
.job-org{ font-size: 14px; color: var(--ink-faint); margin-bottom: 14px; }

.proj{ margin: 20px 0 0; padding-left: 18px; border-left: 1px solid var(--rule); }
.proj h4{ font-size: 15.5px; margin: 0 0 8px; font-weight: 700; color: var(--ink); }
.proj p{ margin: 0 0 10px; font-size: 14.5px; color: var(--ink-soft); }
.proj ul{ margin: 0 0 10px; padding-left: 18px; }
.proj li{ font-size: 14.5px; color: var(--ink-soft); margin-bottom: 6px; }
.metric-line{
  font-family: var(--font-mono); font-size: 13px; color: var(--teal);
  background: color-mix(in srgb, var(--teal) 8%, transparent);
  padding: 10px 14px; border-radius: 3px; margin: 10px 0 0;
}

.patent-list{ font-size: 14px; color: var(--ink-soft); }
.patent-list li{ margin-bottom: 8px; }

.edu-row{ display: grid; grid-template-columns: 1fr auto; gap: 12px; margin-bottom: 18px; }
.edu-row .school{ font-weight: 700; font-size: 15.5px; color: var(--ink); }
.edu-row .detail{ font-size: 13.5px; color: var(--ink-faint); }
.edu-row .period{ font-family: var(--font-mono); font-size: 12.5px; color: var(--ink-faint); white-space: nowrap; }

@media print{
  .site-header, .site-footer, .resume-actions, .grain{ display: none !important; }
  body{ background: #fff; color: #000; font-size: 11.5pt; line-height: 1.5; }
  .wrap{ max-width: 100%; padding: 0 6mm; }
  .resume-header{ padding: 0 0 12px; }
  .resume-meta{ padding: 8px 0 18px; }
  .resume-section{ padding: 14px 0; }
  a{ color: #000 !important; }
  h3, h4{ break-after: avoid; }
  .eyebrow{ break-after: avoid; }
  .job{ break-inside: avoid-page; margin-bottom: 20px; }
  .proj{ margin-top: 12px; padding-left: 14px; }
  .proj p{ margin-bottom: 6px; }
  .proj h4{ margin-bottom: 4px; }
  .metric-line{ padding: 6px 10px; margin-top: 6px; }
  .job-org{ margin-bottom: 8px; }
  .resume-section h2{ margin-bottom: 14px; }
  .edu-row{ margin-bottom: 10px; }
  .skill-grid{ gap: 12px; }
  .reveal{ opacity: 1 !important; transform: none !important; }
}