/* ==========================================================================
   littletheta.com — site styles
   Tokens mirror brand/colors/palette.css and brand/typography/README.md
   ========================================================================== */

:root {
  /* color */
  --ink: #151826;
  --ink-90: #2A2D3C;
  --ink-70: #4F5262;
  --ink-50: #7A7D8C;
  --ink-30: #B3B5BE;
  --ink-15: #D9D8D4;
  --ink-s2: #1E2132;
  --ink-s3: #2A2E42;
  --chalk: #F6F3EC;
  --chalk-2: #EEEAE0;
  --chalk-3: #E4DFD2;
  --ember: #F25C2A;
  --ember-deep: #C43F12;
  --circuit: #1FA6A0;
  --signal: #F2B705;

  /* type */
  --ff-display: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
  --ff-body: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --ff-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --fs-hero: clamp(2.6rem, 6.2vw, 4.9rem);
  --fs-h1: clamp(2rem, 4vw, 3rem);
  --fs-h2: clamp(1.35rem, 2.4vw, 1.8rem);
  --fs-lead: clamp(1.1rem, 1.6vw, 1.3rem);
  --fs-body: 1.0625rem;
  --fs-small: 0.9rem;

  /* layout */
  --measure: 66ch;
  --container: 1120px;
  --gutter: clamp(1.25rem, 4vw, 2.5rem);
  --section-y: clamp(4rem, 10vw, 8rem);
  --radius: 14px;
  --radius-sm: 8px;
  --ease: cubic-bezier(.2,.7,.2,1);
}

/* ---- reset-ish ---- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { animation: none !important; transition: none !important; } }
body {
  margin: 0;
  font-family: var(--ff-body);
  font-size: var(--fs-body);
  line-height: 1.55;
  color: var(--ink);
  background: var(--chalk);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { max-width: 100%; height: auto; display: block; }
a { color: var(--ember-deep); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 0.15em; }
a:hover { color: var(--ember); }
h1, h2, h3, h4 { font-family: var(--ff-display); font-weight: 700; line-height: 1.08; letter-spacing: -0.02em; margin: 0 0 0.5em; }
p { margin: 0 0 1em; max-width: var(--measure); }
code, .mono { font-family: var(--ff-mono); font-size: 0.9em; }
::selection { background: var(--ember); color: var(--chalk); }

.skip { position: absolute; left: -999px; top: 0; background: var(--ember); color: var(--chalk); padding: .5rem 1rem; z-index: 100; }
.skip:focus { left: 1rem; top: 1rem; }

.container { width: min(var(--container), 100% - var(--gutter) * 2); margin-inline: auto; }

/* ---- dark band ---- */
.dark { background: var(--ink); color: var(--chalk); }
.dark a:where(:not(.btn, .brand, .nav-links a, .footer-links a, .email)) { color: var(--ember); }
.dark a:where(:not(.btn, .brand, .nav-links a, .footer-links a, .email)):hover { color: #FF7A4D; }
.dark ::selection { background: var(--chalk); color: var(--ink); }

/* ---- header ---- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--ink) 88%, transparent);
  backdrop-filter: saturate(1.2) blur(10px);
  -webkit-backdrop-filter: saturate(1.2) blur(10px);
  border-bottom: 1px solid var(--ink-s3);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 68px; gap: 1rem; }
a.brand, .dark a.brand { display: inline-flex; align-items: center; gap: .65rem; text-decoration: none; color: var(--chalk); }
.brand svg { width: 28px; height: 28px; }
.brand .wordmark { font-family: var(--ff-display); font-weight: 500; font-size: 1.25rem; letter-spacing: -0.03em; }
.nav-links { display: flex; gap: clamp(1rem, 3vw, 2rem); list-style: none; margin: 0; padding: 0; }
.nav-links a { color: var(--chalk); text-decoration: none; font-size: .95rem; font-weight: 500; opacity: .85; }
.nav-links a:hover { opacity: 1; color: var(--chalk); text-decoration: underline; text-decoration-color: var(--ember); text-decoration-thickness: 2px; text-underline-offset: .35em; }
@media (max-width: 700px) { .nav-links li:nth-child(-n+3) { display: none; } }

/* ---- hero ---- */
.hero { position: relative; overflow: hidden; padding: clamp(4rem, 10vw, 8.5rem) 0 clamp(4rem, 9vw, 7rem); }
.hero .container { position: relative; z-index: 1; }
.hero-mark { position: absolute; right: max(2vw, calc((100% - var(--container)) / 2 - 2rem)); top: 50%; transform: translateY(-50%); width: clamp(220px, 30vw, 420px); opacity: .9; pointer-events: none; }
.hero-mark ellipse { stroke: var(--ink-s3); }
@media (max-width: 1000px) { .hero-mark { display: none; } }
.eyebrow { font-family: var(--ff-mono); font-size: .85rem; letter-spacing: .02em; color: var(--ink-30); margin-bottom: 1.25rem; display: inline-flex; align-items: center; gap: .6rem; }
.eyebrow::before { content: ""; width: 22px; height: 3px; background: var(--ember); }
.hero h1 { font-size: var(--fs-hero); max-width: 16ch; margin-bottom: 1.25rem; }
.hero h1 em { font-style: normal; color: var(--ember); }
.hero .lead { font-size: var(--fs-lead); color: var(--ink-30); max-width: 52ch; margin-bottom: 2rem; }
.hero .lead strong { color: var(--chalk); font-weight: 500; }
.cta-row { display: flex; gap: .75rem; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  font-family: var(--ff-display); font-weight: 700; font-size: 1rem; letter-spacing: -0.01em;
  padding: .8rem 1.25rem; border-radius: 999px; text-decoration: none;
  transition: transform .15s var(--ease), background .15s var(--ease), color .15s var(--ease);
}
.btn:active { transform: translateY(1px); }
a.btn-primary, .dark a.btn-primary { background: var(--ember); color: var(--ink); }
a.btn-primary:hover, .dark a.btn-primary:hover { background: #FF7A4D; color: var(--ink); }
a.btn-ghost, .dark a.btn-ghost { color: var(--chalk); border: 1.5px solid var(--ink-s3); }
a.btn-ghost:hover, .dark a.btn-ghost:hover { border-color: var(--chalk); color: var(--chalk); }
.light .btn-ghost { color: var(--ink); border-color: var(--chalk-3); }
.light .btn-ghost:hover { border-color: var(--ink); color: var(--ink); }

/* ---- sections ---- */
.section { padding: var(--section-y) 0; }
.section-head { margin-bottom: clamp(2rem, 4vw, 3.5rem); }
.section-head h2 { font-size: var(--fs-h1); max-width: 18ch; }
.kicker { font-family: var(--ff-display); font-weight: 700; font-size: .9rem; letter-spacing: .04em; text-transform: uppercase; color: var(--ember-deep); margin-bottom: .75rem; display: block; }
.dark .kicker { color: var(--ember); }
.section-head p { font-size: var(--fs-lead); color: var(--ink-70); }
.dark .section-head p { color: var(--ink-30); }
.rule { border: 0; border-top: 1px solid var(--chalk-3); margin: 0; }
.dark .rule { border-color: var(--ink-s3); }

/* ---- work cards ---- */
.work-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }
@media (max-width: 900px) { .work-grid { grid-template-columns: 1fr; } }
.card {
  display: flex; flex-direction: column; gap: 1rem;
  background: var(--chalk-2); border: 1px solid var(--chalk-3); border-radius: var(--radius);
  padding: 1.5rem; text-decoration: none; color: inherit;
  transition: transform .25s var(--ease), border-color .25s var(--ease), box-shadow .25s var(--ease);
}
.card:hover { transform: translateY(-3px); border-color: var(--ink-30); box-shadow: 0 12px 30px -18px rgba(21,24,38,.35); color: inherit; }
.card-icon { width: 52px; height: 52px; border-radius: 12px; display: grid; place-items: center; background: var(--ink); color: var(--chalk); }
.card-icon svg { width: 30px; height: 30px; }
.card h3 { font-size: var(--fs-h2); margin: 0; }
.card h3 small { display: block; font-family: var(--ff-mono); font-weight: 400; font-size: .8rem; color: var(--ink-50); letter-spacing: 0; margin-top: .25rem; }
.card p { color: var(--ink-70); margin: 0; flex: 1; }
.card .tags { display: flex; flex-wrap: wrap; gap: .4rem; }
.tag { font-family: var(--ff-mono); font-size: .72rem; padding: .25rem .55rem; border-radius: 999px; border: 1px solid var(--ink-15); color: var(--ink-70); background: var(--chalk); }
.card .go { font-family: var(--ff-display); font-weight: 700; color: var(--ember-deep); display: inline-flex; gap: .35rem; align-items: center; }
.card:hover .go { color: var(--ember); }
.card .go svg { width: 16px; height: 16px; transition: transform .2s var(--ease); }
.card:hover .go svg { transform: translateX(3px); }

/* ---- studio / story ---- */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 6vw, 6rem); align-items: start; }
@media (max-width: 860px) { .two-col { grid-template-columns: 1fr; } }
.prose p { font-size: 1.1rem; color: var(--ink-90); }
.prose .big { font-family: var(--ff-display); font-size: var(--fs-h2); font-weight: 500; line-height: 1.3; letter-spacing: -0.015em; color: var(--ink); }
.notation { font-family: var(--ff-mono); background: var(--chalk-2); border: 1px solid var(--chalk-3); border-radius: var(--radius); padding: 1.25rem 1.5rem; font-size: .95rem; line-height: 1.9; }
.notation table { border-collapse: collapse; width: 100%; }
.notation td { padding: .1rem .5rem .1rem 0; vertical-align: top; white-space: nowrap; }
.notation td:last-child { white-space: normal; color: var(--ink-70); }
.notation tr.us td { color: var(--ember-deep); font-weight: 500; }
.notation tr.us td:last-child { color: var(--ember-deep); }
.notation .sym { font-size: 1.15em; }

.principles { list-style: none; margin: 0; padding: 0; display: grid; gap: 1.75rem; }
.principles li { padding-left: 2.25rem; position: relative; }
.principles li::before { content: attr(data-n); position: absolute; left: 0; top: .2rem; font-family: var(--ff-mono); font-size: .8rem; color: var(--ember-deep); }
.principles h3 { font-size: 1.2rem; margin-bottom: .3rem; }
.principles p { margin: 0; color: var(--ink-70); }

/* ---- approach (dark band) ---- */
.approach-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(1.5rem, 3vw, 3rem); }
@media (max-width: 860px) { .approach-grid { grid-template-columns: 1fr; } }
.approach-grid h3 { font-size: 1.25rem; margin-bottom: .5rem; display: flex; align-items: center; gap: .6rem; }
.approach-grid h3::before { content: ""; width: 10px; height: 10px; border-radius: 50%; background: var(--ember); flex: none; }
.approach-grid p { color: var(--ink-30); margin: 0; }

.ticker { overflow: hidden; white-space: nowrap; border-top: 1px solid var(--ink-s3); border-bottom: 1px solid var(--ink-s3); padding: .9rem 0; margin-top: clamp(3rem, 6vw, 5rem); -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); }
.ticker-track { display: inline-flex; gap: 0; animation: ticker 60s linear infinite; }
.ticker span { font-family: var(--ff-mono); font-size: .9rem; color: var(--ink-30); padding: 0 1.25rem; }
.ticker span::after { content: "·"; color: var(--ember); margin-left: 2.5rem; }
@keyframes ticker { to { transform: translateX(-50%); } }
@media (prefers-reduced-motion: reduce) { .ticker-track { animation: none; } }

/* ---- contact ---- */
.contact { text-align: left; }
.contact h2 { font-size: var(--fs-h1); max-width: 16ch; }
.contact .email { font-family: var(--ff-display); font-size: clamp(1.3rem, 3vw, 2rem); font-weight: 500; letter-spacing: -0.02em; color: var(--ink); text-decoration: none; border-bottom: 3px solid var(--ember); }
.contact .email:hover { color: var(--ember-deep); }
.contact-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: clamp(2rem, 6vw, 6rem); align-items: end; }
@media (max-width: 860px) { .contact-grid { grid-template-columns: 1fr; } }
.contact-list { list-style: none; margin: 0; padding: 0; display: grid; gap: .75rem; }
.contact-list li { display: flex; justify-content: space-between; gap: 1rem; padding-bottom: .75rem; border-bottom: 1px solid var(--chalk-3); font-size: .95rem; }
.contact-list li span:first-child { color: var(--ink-50); font-family: var(--ff-mono); font-size: .85rem; }

/* ---- footer ---- */
.site-footer { padding: 2.5rem 0; font-size: var(--fs-small); color: var(--ink-30); }
.footer-row { display: flex; justify-content: space-between; gap: 1.5rem; flex-wrap: wrap; align-items: center; }
.footer-row .brand svg { width: 22px; height: 22px; }
.footer-row .brand .wordmark { font-size: 1.05rem; }
.footer-links { list-style: none; margin: 0; padding: 0; display: flex; gap: 1.5rem; }
.footer-links a, .dark .footer-links a { color: var(--ink-30); text-decoration: none; }
.footer-links a:hover, .dark .footer-links a:hover { color: var(--chalk); }


/* ---- page hero (about) ---- */
.page-hero { padding: clamp(3rem, 8vw, 6rem) 0 clamp(3rem, 7vw, 5rem); }
.page-hero h1 { font-size: var(--fs-h1); max-width: 20ch; }
.page-hero .lead { font-size: var(--fs-lead); color: var(--ink-30); max-width: 56ch; }

/* ---- pillars ---- */
.pillars { display: grid; gap: 1.25rem; }
.pillar { border-top: 3px solid var(--ember); padding-top: 1rem; }
.pillar h3 { font-size: 1.3rem; margin-bottom: .35rem; }
.pillar p { margin: 0; color: var(--ink-70); }

/* ---- founder letter ---- */
.letter { max-width: 760px; }
.letter h2 { font-size: var(--fs-h1); }
.letter-body p { font-size: 1.15rem; line-height: 1.7; color: var(--ink-30); max-width: 62ch; }
.letter-body .sig { font-family: var(--ff-display); font-weight: 500; color: var(--chalk); margin-top: 1.5rem; }

/* ---- rules ---- */
.rules { list-style: none; counter-reset: rule; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem clamp(1.5rem, 3vw, 3rem); }
@media (max-width: 900px) { .rules { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .rules { grid-template-columns: 1fr; } }
.rules li { counter-increment: rule; border-top: 1px solid var(--chalk-3); padding-top: 1rem; }
.rules li::before { content: "0" counter(rule); font-family: var(--ff-mono); font-size: .8rem; color: var(--ember-deep); display: block; margin-bottom: .6rem; }
.rules h3 { font-size: 1.25rem; margin-bottom: .35rem; }
.rules p { margin: 0; color: var(--ink-70); }

/* ---- compact app list ---- */
.apps-col { align-items: start; }
.app-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--chalk-3); }
.app-list li { border-bottom: 1px solid var(--chalk-3); }
.app-list a, .app-list .app-more { display: grid; grid-template-columns: 9.5rem 1fr auto; gap: 1rem; align-items: baseline; padding: 1.1rem 0; text-decoration: none; color: inherit; }
@media (max-width: 560px) { .app-list a, .app-list .app-more { grid-template-columns: 1fr auto; } .app-list .app-desc { grid-column: 1 / -1; } }
.app-name { font-family: var(--ff-display); font-weight: 700; font-size: 1.2rem; letter-spacing: -0.01em; }
.app-desc { color: var(--ink-70); }
.app-go { color: var(--ember-deep); font-weight: 700; transition: transform .2s var(--ease); }
.app-list a:hover .app-go { transform: translateX(4px); }
.app-list a:hover .app-name { color: var(--ember-deep); }
.app-more .app-name { color: var(--ink-50); }

/* ---- contact (dark) ---- */
.email-dark, .dark a.email-dark { color: var(--chalk); }
.email-dark:hover, .dark a.email-dark:hover { color: var(--ember); }
.contact-list-dark li { border-color: var(--ink-s3); }
.contact-list-dark li span:first-child { color: var(--ink-50); }

/* ---- facts (about) ---- */
.facts { display: grid; gap: 0; border-top: 1px solid var(--chalk-3); }
.facts div { display: grid; grid-template-columns: 9rem 1fr; gap: 1rem; padding: .9rem 0; border-bottom: 1px solid var(--chalk-3); }
.facts b { font-family: var(--ff-mono); font-weight: 500; font-size: .85rem; color: var(--ink-50); }
.notation-title { font-family: var(--ff-display); font-weight: 700; margin-bottom: .5rem; color: var(--ink); }

/* ---- 404 ---- */
.notfound { min-height: 70vh; display: grid; place-items: center; text-align: center; }
.notfound h1 { font-size: var(--fs-hero); }
.notfound p { margin-inline: auto; }