/* TACI Labs. Editorial, warm, typographic. No external assets. */

:root {
  --paper:    #f6f4ef;
  --paper-2:  #f0ede4;
  --card:     #fbfaf6;
  --ink:      #17150f;
  --ink-soft: #3a352b;
  --muted:    #6c6555;
  --line:     #e3ddd0;
  --line-2:   #d6cfbf;
  --accent:   #bd4a2a;
  --accent-2: #a23c20;
  --on-accent: #ffffff;
  --wrap:     1080px;

  --serif: "Iowan Old Style", "Charter", "Palatino Linotype", Palatino,
           "Book Antiqua", Georgia, "Times New Roman", serif;
  --sans:  -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
           Arial, "Apple Color Emoji", "Segoe UI Emoji", sans-serif;
}

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

body {
  margin: 0;
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 28px;
}

.rule { height: 1px; background: var(--line); }
.wrap-rule { max-width: calc(var(--wrap) - 56px); margin: 0 auto; }

.skip { position: absolute; left: -9999px; top: 0; background: var(--ink); color: var(--paper); padding: 10px 16px; border-radius: 6px; z-index: 100; }
.skip:focus { left: 16px; top: 16px; }

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 74px; }

.brand { display: inline-flex; align-items: center; }
.brand-name { font-family: var(--serif); font-size: 19px; letter-spacing: 0.01em; }

.nav-links { display: flex; align-items: center; gap: 30px; font-size: 15px; }
.nav-links > a { color: var(--ink-soft); transition: color .15s ease; }
.nav-links > a:hover { color: var(--accent); }

.lang { display: inline-flex; align-items: center; gap: 8px; margin-left: 6px; }
.lang-sep { width: 1px; height: 14px; background: var(--line-2); }
.lang-btn {
  border: 0; background: none; cursor: pointer; padding: 2px 2px;
  font: 600 13px var(--sans); letter-spacing: 0.06em; color: var(--muted);
  transition: color .15s ease;
}
.lang-btn:hover { color: var(--ink); }
.lang-btn[aria-pressed="true"] { color: var(--accent); }

.theme-toggle {
  display: inline-grid; place-items: center;
  width: 34px; height: 34px; margin-left: 6px;
  border: 1px solid var(--line-2); border-radius: 7px;
  background: transparent; color: var(--ink-soft); cursor: pointer;
  transition: color .15s ease, border-color .15s ease, background .15s ease;
}
.theme-toggle:hover { color: var(--accent); border-color: var(--ink); }
.theme-toggle .icon { display: block; }
/* Icon reflects the theme you would switch TO. Light shown -> click for dark, etc. */
.icon-sun { display: none; }
.icon-moon { display: block; }
:root[data-theme="dark"] .icon-sun { display: block; }
:root[data-theme="dark"] .icon-moon { display: none; }
:root[data-theme="light"] .icon-sun { display: none; }
:root[data-theme="light"] .icon-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .icon-sun { display: block; }
  :root:not([data-theme]) .icon-moon { display: none; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 24px; border-radius: 4px;
  font: 600 15px var(--sans); border: 1px solid transparent;
  cursor: pointer; transition: transform .12s ease, background .15s ease, border-color .15s ease, color .15s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: var(--on-accent); }
.btn-primary:hover { background: var(--accent-2); }
.btn-quiet { background: transparent; color: var(--ink); border-color: var(--line-2); }
.btn-quiet:hover { border-color: var(--ink); }
.btn-lg { padding: 16px 34px; font-size: 17px; }

/* ---------- Hero ---------- */
.hero { padding: 104px 0 92px; }
.hero-title {
  margin: 0; font-family: var(--serif); font-weight: 600;
  font-size: clamp(2.7rem, 6.4vw, 4.6rem); line-height: 1.06;
  letter-spacing: -0.015em; max-width: 15ch; color: var(--ink);
}
.hero-sub {
  margin: 30px 0 0; max-width: 54ch;
  font-size: clamp(1.08rem, 2vw, 1.3rem); color: var(--ink-soft);
}
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 40px; }

/* ---------- Sections ---------- */
.section { padding: 88px 0; }
.section-head { max-width: 60ch; margin-bottom: 52px; }
.section-label {
  margin: 0 0 16px; font-size: 12.5px; font-weight: 600;
  letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted);
}
.section-head h2 {
  margin: 0 0 16px; font-family: var(--serif); font-weight: 600;
  font-size: clamp(1.9rem, 4vw, 2.7rem); letter-spacing: -0.01em; line-height: 1.1;
}
.lede { margin: 0; color: var(--ink-soft); font-size: 1.14rem; max-width: 54ch; }

/* ---------- Product cards ---------- */
.cards { display: grid; grid-template-columns: 1.3fr 1fr; gap: 22px; }
.card {
  padding: 38px 36px; border-radius: 8px;
  border: 1px solid var(--line); background: var(--card);
  transition: border-color .18s ease, transform .18s ease;
}
.card:hover { border-color: var(--line-2); transform: translateY(-2px); }
.card-lead {
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--accent) 5%, var(--card)), var(--card));
  border-color: color-mix(in srgb, var(--accent) 22%, var(--line));
}
.card h3 { margin: 0 0 14px; font-family: var(--serif); font-weight: 600; font-size: 1.9rem; letter-spacing: -0.01em; }
.card p { margin: 0 0 26px; color: var(--ink-soft); }
.card-badge {
  margin: 0 0 22px; font-size: 12.5px; font-weight: 600;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent);
}
.card-badge.muted { color: var(--muted); }
.card-link { display: inline-flex; align-items: center; gap: 9px; font-weight: 600; color: var(--ink); }
.card-link:hover { color: var(--accent); }
.card-link .arrow { transition: transform .15s ease; }
.card-link:hover .arrow { transform: translateX(4px); }

/* ---------- Principles ---------- */
.principles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }
.principle { padding-top: 24px; border-top: 2px solid var(--ink); }
.principle h3 { margin: 0 0 12px; font-family: var(--serif); font-weight: 600; font-size: 1.4rem; letter-spacing: -0.01em; }
.principle p { margin: 0; color: var(--muted); }

/* ---------- Contact ---------- */
.contact { text-align: center; }
.contact-inner { max-width: 620px; margin: 0 auto; }
.contact h2 { margin: 0 0 16px; font-family: var(--serif); font-weight: 600; font-size: clamp(2.1rem, 5vw, 3.1rem); letter-spacing: -0.015em; }
.contact .lede { margin: 0 auto 32px; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--line); padding: 34px 0; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 18px; flex-wrap: wrap; color: var(--muted); font-size: 14.5px; }
.footer-brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); font-family: var(--serif); font-size: 16px; }
.footer-copy { margin: 0; display: inline-flex; gap: 6px; flex-wrap: wrap; }
.footer-mail:hover { color: var(--accent); }

/* ---------- Responsive ---------- */
@media (max-width: 820px) {
  .cards { grid-template-columns: 1fr; }
  .principles { grid-template-columns: 1fr; gap: 30px; }
  .nav-links { gap: 18px; }
  .nav-links > a { display: none; }
  .hero { padding: 76px 0 66px; }
  .section { padding: 64px 0; }
}
@media (max-width: 480px) {
  .footer-inner { flex-direction: column; align-items: flex-start; gap: 12px; }
}

/* ---------- Warm dark mode ----------
   Applies when the user explicitly picks dark, OR when the device prefers dark
   and no explicit choice has been made. An explicit light choice always wins. */
:root[data-theme="dark"] {
  --paper:    #16140f;
  --paper-2:  #1c1a14;
  --card:     #1e1b15;
  --ink:      #f3efe6;
  --ink-soft: #cdc6b8;
  --muted:    #9a9384;
  --line:     #2c2820;
  --line-2:   #3a352b;
  --accent:   #e0714b;
  --accent-2: #ec7f59;
  --on-accent: #16140f;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --paper:    #16140f;
    --paper-2:  #1c1a14;
    --card:     #1e1b15;
    --ink:      #f3efe6;
    --ink-soft: #cdc6b8;
    --muted:    #9a9384;
    --line:     #2c2820;
    --line-2:   #3a352b;
    --accent:   #e0714b;
    --accent-2: #ec7f59;
    --on-accent: #16140f;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}