/* =========================================================================
   Y Combinator Atlas — styles.css  (zero-build, custom design)
   Editorial tech-atlas aesthetic built around "YC orange".
   ========================================================================= */

:root, [data-theme="light"] {
  --bg:            #FBF7F2;
  --bg-grad:       radial-gradient(1200px 600px at 80% -10%, #FFEAD9 0%, rgba(255,234,217,0) 60%);
  --surface:       #FFFFFF;
  --surface-2:     #F5EFE6;
  --surface-3:     #EFE7DA;
  --ink:           #1A1512;
  --ink-soft:      #5E574F;
  --ink-faint:     #908779;
  --line:          #E8DECF;
  --line-strong:   #D8CBB6;
  --accent:        #FB651E;
  --accent-2:      #E8500A;
  --accent-ink:    #FFFFFF;
  --accent-soft:   #FFE7D8;
  --accent-faint:  #FFF2EA;
  --shadow:        0 1px 2px rgba(40,24,12,.06), 0 8px 24px -12px rgba(40,24,12,.18);
  --shadow-lg:     0 24px 60px -20px rgba(40,24,12,.30);
  --st-active:#1f9d57; --st-ipo:#2d7ff9; --st-acquired:#9b5de5; --st-shutdown:#9aa0a6;
  --vt-unicorn:#e0a000; --vt-decacorn:#e0457b; --vt-hectocorn:#fb651e;
  --radius:14px; --radius-lg:22px; --radius-sm:9px;
  --maxw:1200px;
}
[data-theme="dark"] {
  --bg:            #14110D;
  --bg:            #14110D;
  --bg-grad:       radial-gradient(1200px 600px at 80% -10%, #3a2113 0%, rgba(58,33,19,0) 60%);
  --surface:       #1D1813;
  --surface-2:     #251F18;
  --surface-3:     #2E261D;
  --ink:           #F4ECE1;
  --ink-soft:      #B3A899;
  --ink-faint:     #877C6D;
  --line:          #322A20;
  --line-strong:   #43392C;
  --accent:        #FF7A3C;
  --accent-2:      #FF935E;
  --accent-ink:    #1A0E06;
  --accent-soft:   #3A2416;
  --accent-faint:  #241710;
  --shadow:        0 1px 2px rgba(0,0,0,.4), 0 10px 30px -14px rgba(0,0,0,.6);
  --shadow-lg:     0 30px 70px -24px rgba(0,0,0,.7);
  --st-active:#36b46e; --st-ipo:#5b9dff; --st-acquired:#b885f0; --st-shutdown:#7d8590;
  --vt-unicorn:#f0bb3a; --vt-decacorn:#f2699b; --vt-hectocorn:#ff7a3c;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  background-image: var(--bg-grad);
  background-attachment: fixed;
  color: var(--ink);
  font-family: "Inter", "Noto Sans TC", system-ui, -apple-system, sans-serif;
  font-size: 16px; line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "cv05","ss01";
}
:lang(zh-Hant) body, [lang="zh-Hant"] { font-family: "Inter","Noto Sans TC", system-ui, sans-serif; }
h1,h2,h3,h4 { font-family: "Space Grotesk","Noto Sans TC", sans-serif; font-weight: 700; line-height: 1.12; letter-spacing: -.02em; margin: 0; }
a { color: inherit; text-decoration: none; }
.mono { font-family: "Space Mono","Roboto Mono", monospace; }
img { max-width: 100%; }
::selection { background: var(--accent); color: var(--accent-ink); }

.skip-link { position: fixed; left: -999px; top: 8px; z-index: 200; background: var(--accent); color: var(--accent-ink); padding: 10px 16px; border-radius: var(--radius-sm); }
.skip-link:focus { left: 8px; }

.material-symbols-rounded { font-variation-settings: "FILL" 0,"wght" 400,"GRAD" 0,"opsz" 24; vertical-align: middle; }

/* ---------------- app bar ---------------- */
.appbar { position: sticky; top: 0; z-index: 100; backdrop-filter: saturate(140%) blur(12px);
  background: color-mix(in srgb, var(--bg) 82%, transparent); border-bottom: 1px solid var(--line); }
.appbar__inner { max-width: var(--maxw); margin: 0 auto; padding: 11px 20px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.brand { display: inline-flex; align-items: center; gap: 11px; font-weight: 700; }
.brand__mark { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 7px;
  background: var(--accent); color: var(--accent-ink); font-family: "Space Grotesk",sans-serif; font-weight: 700; font-size: 20px; }
.brand__name { font-family: "Space Grotesk",sans-serif; letter-spacing: -.02em; font-size: 1.05rem; }
.appbar__actions { display: flex; align-items: center; gap: 8px; }
.icon-btn { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; border: 1px solid var(--line-strong);
  background: var(--surface); color: var(--ink); border-radius: 999px; height: 38px; padding: 0 12px; font: inherit; font-size: .9rem; transition: .15s; }
.icon-btn:hover { border-color: var(--accent); color: var(--accent); }
.icon-btn__txt { font-weight: 600; font-size: .82rem; }
.ghbtn { display: inline-flex; align-items: center; gap: 6px; height: 38px; padding: 0 13px; border-radius: 999px;
  border: 1px solid var(--line-strong); background: var(--surface); font-size: .85rem; font-weight: 600; transition: .15s; }
.ghbtn:hover { border-color: var(--accent); color: var(--accent); }
.ghbtn .material-symbols-rounded { font-size: 19px; color: var(--vt-unicorn); }
@media (max-width: 640px){ .ghbtn__count, .brand__name { display: none; } }

/* ---------------- page nav ---------------- */
.pagenav { border-top: 1px solid var(--line); overflow-x: auto; scrollbar-width: none; }
.pagenav::-webkit-scrollbar { display: none; }
.pagenav__inner { max-width: var(--maxw); margin: 0 auto; padding: 9px 16px; display: flex; gap: 6px; }
.navpill { flex: 0 0 auto; display: inline-flex; align-items: center; gap: 7px; padding: 7px 14px; border-radius: 999px;
  color: var(--ink-soft); font-weight: 600; font-size: .9rem; white-space: nowrap; transition: .15s; border: 1px solid transparent; }
.navpill .material-symbols-rounded { font-size: 19px; }
.navpill:hover { background: var(--surface-2); color: var(--ink); }
.navpill--active { background: var(--accent); color: var(--accent-ink); }
.navpill--active:hover { background: var(--accent); color: var(--accent-ink); }

/* ---------------- layout ---------------- */
main { display: block; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
.page-head { max-width: var(--maxw); margin: 0 auto; padding: 40px 20px 8px; }
.page-head h1 { font-size: clamp(1.8rem, 4vw, 2.7rem); }
.page-head__sub { color: var(--ink-soft); font-size: 1.05rem; margin: 10px 0 0; max-width: 60ch; }
.eyebrow { font-family: "Space Mono",monospace; text-transform: uppercase; letter-spacing: .18em; font-size: .72rem; color: var(--accent-2); font-weight: 700; }

.footer { border-top: 1px solid var(--line); margin-top: 64px; }
.footer__inner { max-width: var(--maxw); margin: 0 auto; padding: 28px 20px 56px; color: var(--ink-soft); font-size: .88rem; }
.footer__note { color: var(--ink-faint); font-size: .8rem; margin: 6px 0 0; }

/* ---------------- buttons / chips ---------------- */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 11px 20px; border-radius: 999px; font-weight: 600; cursor: pointer;
  border: 1px solid var(--line-strong); background: var(--surface); color: var(--ink); font: inherit; font-weight: 600; transition: .15s; }
.btn--primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn--primary:hover { background: var(--accent-2); border-color: var(--accent-2); }
.btn:hover { border-color: var(--accent); }
.chip { display: inline-flex; align-items: center; gap: 6px; padding: 6px 13px; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--line-strong); background: var(--surface); color: var(--ink-soft); font-size: .84rem; font-weight: 600; transition: .12s; }
.chip .material-symbols-rounded { font-size: 17px; }
.chip:hover { border-color: var(--accent); color: var(--accent); }
.chip--on { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.chip--on:hover { color: var(--accent-ink); }

/* =========================================================================
   HOME
   ========================================================================= */
.hero { max-width: var(--maxw); margin: 0 auto; padding: 56px 20px 12px; }
.hero__eyebrow { margin-bottom: 18px; }
.hero h1 { font-size: clamp(2.3rem, 6vw, 4.4rem); letter-spacing: -.03em; }
.hero h1 .accent { color: var(--accent); }
.hero__lede { font-size: clamp(1.05rem, 2.2vw, 1.35rem); color: var(--ink-soft); max-width: 56ch; margin: 22px 0 30px; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 12px; }

.statgrid { max-width: var(--maxw); margin: 40px auto 0; padding: 0 20px;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(170px,1fr)); gap: 14px; }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 20px 18px; box-shadow: var(--shadow); position: relative; overflow: hidden; }
.stat::before { content:""; position:absolute; left:0; top:0; bottom:0; width:4px; background: var(--accent); opacity:.85; }
.stat__num { font-family: "Space Grotesk",sans-serif; font-weight: 700; font-size: clamp(1.7rem,3.4vw,2.5rem); letter-spacing: -.02em; line-height: 1; }
.stat__label { color: var(--ink-soft); font-size: .9rem; margin-top: 8px; }
.stat__sub { color: var(--ink-faint); font-size: .78rem; margin-top: 3px; }

.section { max-width: var(--maxw); margin: 0 auto; padding: 56px 20px 0; }
.section__head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-bottom: 22px; flex-wrap: wrap; }
.section__head h2 { font-size: clamp(1.4rem, 3vw, 2rem); }
.section__link { color: var(--accent); font-weight: 600; font-size: .92rem; display: inline-flex; align-items: center; gap: 4px; }

.cardgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(265px,1fr)); gap: 16px; }
.navcard { display: flex; flex-direction: column; gap: 10px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 22px; box-shadow: var(--shadow); transition: .18s; }
.navcard:hover { transform: translateY(-3px); border-color: var(--accent); box-shadow: var(--shadow-lg); }
.navcard__icon { width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; background: var(--accent-soft); color: var(--accent-2); }
.navcard__icon .material-symbols-rounded { font-size: 24px; }
.navcard h3 { font-size: 1.2rem; }
.navcard p { color: var(--ink-soft); font-size: .92rem; margin: 0; }
.navcard__go { color: var(--accent); font-weight: 600; font-size: .88rem; margin-top: auto; display: inline-flex; align-items: center; gap: 4px; }

.quotestrip { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px,1fr)); gap: 16px; }
.qcard { background: var(--surface); border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); }
.qcard__text { font-family: "Space Grotesk",sans-serif; font-size: 1.08rem; line-height: 1.45; }
.qcard__by { margin-top: 12px; color: var(--ink-soft); font-size: .86rem; font-weight: 600; }
.qcard__ctx { color: var(--ink-faint); font-size: .78rem; }

/* =========================================================================
   COMPANIES
   ========================================================================= */
.toolbar { position: sticky; top: 90px; z-index: 40; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(8px);
  padding: 14px 0; margin-bottom: 8px; border-bottom: 1px solid var(--line); }
.searchbox { display: flex; align-items: center; gap: 10px; background: var(--surface); border: 1px solid var(--line-strong); border-radius: 999px; padding: 0 16px; height: 46px; box-shadow: var(--shadow); }
.searchbox .material-symbols-rounded { color: var(--ink-faint); }
.searchbox input { flex: 1; border: 0; outline: 0; background: transparent; color: var(--ink); font: inherit; font-size: 1rem; }
.filterset { margin-top: 12px; display: flex; flex-direction: column; gap: 9px; }
.filterrow { display: flex; align-items: center; gap: 7px; flex-wrap: wrap; }
.filterrow__label { font-family: "Space Mono",monospace; text-transform: uppercase; letter-spacing: .1em; font-size: .68rem; color: var(--ink-faint); font-weight: 700; min-width: 64px; }
.resultbar { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin: 16px 0 14px; color: var(--ink-soft); font-size: .9rem; }
.resultbar strong { color: var(--ink); font-family: "Space Grotesk",sans-serif; }

.grid-co { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px,1fr)); gap: 14px; }
.co { text-align: left; cursor: pointer; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow); transition: .15s; display: flex; flex-direction: column; gap: 10px; font: inherit; color: inherit; }
.co:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.co__top { display: flex; align-items: center; gap: 11px; }
.mono-logo { flex: 0 0 auto; width: 38px; height: 38px; border-radius: 9px; display: grid; place-items: center; font-family: "Space Grotesk",sans-serif; font-weight: 700; font-size: 1rem; color: #fff; }
.co__id { min-width: 0; flex: 1; }
.co__name { font-family: "Space Grotesk",sans-serif; font-weight: 700; font-size: 1.04rem; display: flex; align-items: center; gap: 6px; }
.co__name .star { color: var(--vt-unicorn); font-size: 15px; }
.co__meta { display: flex; align-items: center; gap: 8px; font-size: .76rem; color: var(--ink-faint); margin-top: 2px; }
.bcode { font-family: "Space Mono",monospace; font-weight: 700; color: var(--accent-2); }
.co__summary { color: var(--ink-soft); font-size: .9rem; flex: 1; }
.co__tags { display: flex; flex-wrap: wrap; gap: 5px; }
.tag { font-size: .7rem; color: var(--ink-faint); background: var(--surface-2); border-radius: 6px; padding: 2px 7px; }
.dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }
.badge { display: inline-flex; align-items: center; gap: 4px; font-size: .68rem; font-weight: 700; padding: 2px 8px; border-radius: 999px; letter-spacing: .02em; text-transform: uppercase; }
.vbadge { color: #fff; }
.loadmore { display: flex; justify-content: center; padding: 34px 0; }
.empty { text-align: center; padding: 60px 20px; color: var(--ink-soft); }
.empty .material-symbols-rounded { font-size: 44px; color: var(--ink-faint); }

/* =========================================================================
   DIALOG
   ========================================================================= */
.dialog { width: min(640px, 94vw); max-height: 88vh; border: 1px solid var(--line-strong); border-radius: var(--radius-lg);
  background: var(--surface); color: var(--ink); padding: 0; box-shadow: var(--shadow-lg); overflow: hidden; }
.dialog::backdrop { background: rgba(20,12,6,.55); backdrop-filter: blur(3px); }
.dialog__bar { display: flex; align-items: center; justify-content: space-between; padding: 12px 14px; border-bottom: 1px solid var(--line); position: sticky; top: 0; background: var(--surface); }
.dialog__nav { display: flex; gap: 6px; }
.dialog__body { padding: 22px 26px 28px; overflow-y: auto; max-height: calc(88vh - 58px); }
.d-head { display: flex; align-items: center; gap: 14px; margin-bottom: 6px; }
.d-head h2 { font-size: 1.6rem; }
.d-meta { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0 16px; }
.d-section { margin-top: 18px; }
.d-section h4 { font-family: "Space Mono",monospace; text-transform: uppercase; letter-spacing: .12em; font-size: .72rem; color: var(--accent-2); margin-bottom: 6px; }
.d-section p { margin: 0; color: var(--ink); }
.d-links { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.d-links a { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; color: var(--accent); font-size: .9rem; }
.d-sources li { color: var(--ink-soft); font-size: .86rem; }

/* =========================================================================
   BATCHES / ERAS
   ========================================================================= */
.era { margin-top: 40px; }
.era__head { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; border-bottom: 2px solid var(--accent); padding-bottom: 10px; margin-bottom: 16px; }
.era__head h2 { font-size: clamp(1.4rem,3vw,2rem); }
.era__years { font-family: "Space Mono",monospace; color: var(--accent-2); font-weight: 700; }
.era__count { margin-left: auto; color: var(--ink-soft); font-size: .9rem; }
.era__body { color: var(--ink-soft); max-width: 70ch; margin-bottom: 6px; }
.era__sig { color: var(--ink-faint); font-size: .88rem; margin-bottom: 16px; }
.era__sig b { color: var(--ink-soft); }
.batchgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px,1fr)); gap: 12px; }
.batchcard { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; box-shadow: var(--shadow); }
.batchcard__top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.batchcard__code { font-family: "Space Mono",monospace; font-weight: 700; color: var(--accent-2); font-size: .95rem; }
.batchcard__n { font-size: .78rem; color: var(--ink-faint); }
.batchcard__list { display: flex; flex-wrap: wrap; gap: 5px; }
.minico { font-size: .76rem; color: var(--ink-soft); background: var(--surface-2); border-radius: 6px; padding: 2px 8px; cursor: pointer; border: 1px solid transparent; }
.minico:hover { border-color: var(--accent); color: var(--accent); }

/* =========================================================================
   ANALYSIS (chapters)
   ========================================================================= */
.chaptoc { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 10px; }
.tocnav { display: inline-flex; align-items: center; padding: 6px 13px; border-radius: 999px; border: 1px solid var(--line-strong);
  background: var(--surface); color: var(--ink-soft); font-size: .82rem; font-weight: 600; transition: .12s; }
.tocnav:hover { border-color: var(--accent); color: var(--accent); }
.article { max-width: 760px; margin: 0 auto; }
.chapter { padding: 40px 0; border-top: 1px solid var(--line); }
.chapter:first-child { border-top: 0; }
.chapter__no { font-family: "Space Mono",monospace; color: var(--accent-2); font-weight: 700; font-size: .8rem; letter-spacing: .1em; }
.chapter h2 { font-size: clamp(1.6rem,3.4vw,2.2rem); margin: 6px 0 0; display: flex; align-items: center; gap: 12px; }
.chapter h2 .material-symbols-rounded { color: var(--accent); font-size: 28px; }
.chapter__lede { font-size: 1.15rem; color: var(--ink-soft); font-style: italic; margin: 14px 0 8px; }
.chapter__sec { margin-top: 26px; }
.chapter__sec h3 { font-size: 1.18rem; margin-bottom: 8px; }
.chapter__sec p { margin: 0 0 12px; }
.observation { margin-top: 26px; background: var(--accent-faint); border: 1px solid var(--accent-soft); border-left: 4px solid var(--accent); border-radius: var(--radius); padding: 18px 20px; }
.observation__tag { font-family: "Space Mono",monospace; text-transform: uppercase; letter-spacing: .12em; font-size: .7rem; color: var(--accent-2); font-weight: 700; display: inline-flex; align-items: center; gap: 6px; margin-bottom: 8px; }

/* =========================================================================
   PEOPLE / ECOSYSTEM / ESSAYS / GLOSSARY
   ========================================================================= */
.peoplegrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px,1fr)); gap: 16px; }
.person { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 22px; box-shadow: var(--shadow); }
.person__top { display: flex; align-items: center; gap: 14px; margin-bottom: 12px; }
.avatar { width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center; color: #fff; font-family: "Space Grotesk",sans-serif; font-weight: 700; font-size: 1.3rem; flex: 0 0 auto; }
.person h3 { font-size: 1.2rem; }
.person__role { color: var(--accent-2); font-weight: 600; font-size: .85rem; }
.person__era { font-family: "Space Mono",monospace; font-size: .75rem; color: var(--ink-faint); }
.person__bio { color: var(--ink); font-size: .94rem; margin: 0 0 10px; }
.person__note { color: var(--ink-soft); font-size: .88rem; border-top: 1px dashed var(--line-strong); padding-top: 10px; }

.compgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px,1fr)); gap: 16px; }
.comp { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 22px; box-shadow: var(--shadow); }
.comp__top { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; }
.comp h3 { font-size: 1.25rem; }
.comp__meta { font-family: "Space Mono",monospace; font-size: .76rem; color: var(--ink-faint); }
.comp p { font-size: .92rem; color: var(--ink-soft); margin: 10px 0 0; }
.comp__vs { margin-top: 12px; background: var(--surface-2); border-radius: var(--radius-sm); padding: 12px 14px; }
.comp__vs .label { font-family:"Space Mono",monospace; font-size:.68rem; text-transform:uppercase; letter-spacing:.1em; color:var(--accent-2); font-weight:700; }

.essaylist { display: flex; flex-direction: column; gap: 12px; }
.essay { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; box-shadow: var(--shadow); transition: .15s; }
.essay:hover { border-color: var(--accent); }
.essay__top { display: flex; align-items: baseline; gap: 10px; justify-content: space-between; }
.essay h3 { font-size: 1.12rem; }
.essay__year { font-family: "Space Mono",monospace; color: var(--ink-faint); font-size: .8rem; }
.essay__digest { color: var(--ink-soft); font-size: .92rem; margin: 8px 0; }
.essay__quote { color: var(--ink); font-style: italic; border-left: 3px solid var(--accent); padding-left: 12px; font-size: .92rem; }
.essay__link { color: var(--accent); font-weight: 600; font-size: .84rem; display: inline-flex; align-items: center; gap: 4px; margin-top: 10px; }

.glossgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px,1fr)); gap: 12px; }
.term { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; box-shadow: var(--shadow); }
.term dt { font-family: "Space Grotesk",sans-serif; font-weight: 700; font-size: 1rem; margin-bottom: 5px; }
.term dd { margin: 0; color: var(--ink-soft); font-size: .9rem; }

/* ---------------- utilities ---------------- */
.hidden { display: none !important; }
.center { text-align: center; }
@media (max-width: 720px) {
  .toolbar { top: 86px; }
  .page-head { padding-top: 28px; }
  .hero { padding-top: 36px; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; scroll-behavior: auto; } }