/* ── tedulabs · tedulabs.com ──────────────────────────────────────────────
   Palette: t = technology (ink blue) · edu = education (pencil amber,
   highlighter, chalkboard green) · labs = experiments (flask green).     */

:root {
  --ink: #1d2b4f;            /* deep ink-blue: pen on paper */
  --ink-2: #162240;
  --paper: #faf6ec;          /* warm notebook paper */
  --card: #fffdf6;           /* index card */
  --chalk: #f6f3e8;          /* chalk on board */
  --blue: #2f6df6;           /* technology */
  --blue-down: #1e51c7;
  --amber: #f6a51c;          /* pencil / highlighter — education */
  --amber-soft: #fcd462;
  --amber-down: #b45309;
  --green: #0f8f63;          /* flask — experiments */
  --green-down: #0b6b4a;
  --board: #0d4f3b;          /* chalkboard green */
  --muted-on-dark: rgba(246, 243, 232, 0.72);
  --muted-on-paper: rgba(29, 43, 79, 0.72);
  --line-on-dark: rgba(246, 243, 232, 0.18);
  --line-on-paper: rgba(29, 43, 79, 0.16);
  --serif: "Fraunces", Georgia, "Times New Roman", serif;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  background: var(--paper);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
}

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

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
}

.container { width: min(1120px, 92vw); margin-inline: auto; }

/* ── Type ──────────────────────────────────────────────────────────────── */

h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 550;
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 0;
}

h1 { font-size: clamp(2.7rem, 6.4vw, 4.7rem); }
h2 { font-size: clamp(1.9rem, 4.2vw, 3rem); margin: 0.6rem 0 1.2rem; }
h3 { font-size: 1.3rem; line-height: 1.25; }

h1 em, h2 em {
  font-style: italic;
  font-weight: 500;
  color: var(--blue-down);
}

.section--dark h1 em,
.section--dark h2 em,
.section--board h2 em { color: var(--amber); }

.kicker {
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--green-down);
  margin: 0 0 1.2rem;
}

.section--dark .kicker,
.section--board .kicker { color: var(--amber); }

.lede {
  font-size: 1.125rem;
  line-height: 1.7;
  max-width: 58ch;
  color: var(--muted-on-paper);
  margin: 0 0 2.4rem;
}

.section--dark .lede { color: var(--muted-on-dark); }
.section--board .lede { color: rgba(246, 243, 232, 0.78); }

.muted {
  color: var(--muted-on-paper);
  font-size: 0.95rem;
  margin: 2rem 0 0;
}

.mono {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* ── Header ────────────────────────────────────────────────────────────── */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--paper);
  border-bottom: 1px solid var(--line-on-paper);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 1.6rem;
  min-height: 64px;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  font-family: var(--serif);
  font-size: 1.32rem;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
}

.wm-edu {
  color: var(--ink);
  background: var(--amber-soft);
  border-radius: 0.25em;
  padding: 0 0.07em;
}

.site-nav {
  display: flex;
  gap: 1.4rem;
  margin-left: auto;
}

.site-nav a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--ink);
  text-decoration: none;
}

.site-nav a:hover { color: var(--blue-down); }

.lang-switch {
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.lang-switch [aria-current] { font-weight: 600; color: var(--ink); }

.lang-switch a {
  color: var(--muted-on-paper);
  text-decoration: none;
}

.lang-switch a:hover { color: var(--blue-down); }

.lang-switch .sep { color: var(--muted-on-paper); padding: 0 0.35rem; }

/* ── Sections ──────────────────────────────────────────────────────────── */

.section { padding: clamp(4.5rem, 9vw, 7rem) 0; }

.section[id] { scroll-margin-top: 84px; }

.section--paper { background: var(--paper); color: var(--ink); }

/* ink-blue board with faint graph-paper grid */
.section--dark {
  background-color: var(--ink);
  background-image:
    linear-gradient(rgba(246, 243, 232, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(246, 243, 232, 0.05) 1px, transparent 1px);
  background-size: 26px 26px;
  color: var(--chalk);
}

/* chalkboard green */
.section--board { background: var(--board); color: var(--chalk); }

.section--bordered { border-top: 1px solid var(--line-on-paper); }

/* ── Hero ──────────────────────────────────────────────────────────────── */

.hero { padding-bottom: 0; }

.hero h1 { max-width: 17ch; margin: 0 0 1.4rem; }

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-bottom: 4.5rem;
}

.hero-rule {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  border-top: 1px solid var(--line-on-dark);
  padding: 1.1rem 0 1.4rem;
  color: var(--muted-on-dark);
}

/* ── Buttons ───────────────────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 0.95rem 1.5rem;
  border-radius: 10px;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.btn:hover { transform: translateY(-2px); }

.btn--accent {
  background: var(--amber);
  color: var(--ink);
}

.btn--accent:hover { background: var(--amber-soft); }

.btn--ghost {
  border: 1px solid var(--line-on-dark);
  color: var(--chalk);
}

.btn--ghost:hover { border-color: var(--amber); color: var(--amber); }

.btn--big {
  font-size: 0.92rem;
  padding: 1.2rem 2rem;
}

/* ── Service cards (index cards on the desk) ───────────────────────────── */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 1.1rem;
  margin-top: 2.6rem;
}

.card {
  background: var(--card);
  color: var(--ink);
  border: 1px solid var(--line-on-paper);
  border-radius: 14px;
  padding: 1.7rem 1.6rem 1.9rem;
  box-shadow: 0 14px 28px rgba(29, 43, 79, 0.08);
  transition: transform 0.25s ease;
}

.card:hover { transform: translateY(-4px); }

.card-index {
  font-family: var(--mono);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  margin: 0 0 1.6rem;
}

.cards .card:nth-child(3n + 1) .card-index { color: var(--blue-down); }
.cards .card:nth-child(3n + 2) .card-index { color: var(--green-down); }
.cards .card:nth-child(3n)     .card-index { color: var(--amber-down); }

.card h3 { color: var(--ink); margin: 0 0 0.7rem; }

.card p:last-child {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--muted-on-paper);
}

/* ── Approach steps (paper cards pinned to the chalkboard) ─────────────── */

.section--board h2 { max-width: 26ch; }

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.1rem;
  margin-top: 2.4rem;
}

.step {
  background: var(--card);
  color: var(--ink);
  border-radius: 14px;
  padding: 1.6rem 1.5rem 1.8rem;
  box-shadow: 0 16px 30px rgba(0, 0, 0, 0.25);
}

.step-num {
  font-family: var(--serif);
  font-size: 2.4rem;
  font-weight: 500;
  line-height: 1;
  margin: 0 0 1.2rem;
}

.steps .step:nth-child(1) .step-num { color: var(--blue-down); }
.steps .step:nth-child(2) .step-num { color: var(--amber-down); }
.steps .step:nth-child(3) .step-num { color: var(--green-down); }

.step h3 { font-size: 1.18rem; color: var(--ink); margin: 0 0 0.6rem; }

.step p:last-child {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.6;
  color: var(--muted-on-paper);
}

.note-mono {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--chalk);
  margin: 2.6rem 0 0;
}

/* ── Clients ───────────────────────────────────────────────────────────── */

.client-wall {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  padding: 0;
  margin: 2.4rem 0 0;
}

.client-wall a {
  display: inline-block;
  font-family: var(--serif);
  font-size: clamp(1.25rem, 2.6vw, 1.7rem);
  font-weight: 550;
  color: var(--ink);
  text-decoration: none;
  padding: 1.05rem 1.7rem;
  border: 1px solid rgba(29, 43, 79, 0.32);
  border-radius: 12px;
  background: var(--card);
  transition: transform 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.client-wall a:hover {
  transform: translateY(-3px);
  border-color: var(--blue-down);
  color: var(--blue-down);
}

/* ── About ─────────────────────────────────────────────────────────────── */

.about-grid {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: 3rem;
  align-items: start;
}

.about-copy p {
  font-size: 1.05rem;
  line-height: 1.75;
  margin: 0 0 1.3rem;
}

.about-copy strong { font-weight: 600; }

.text-link {
  font-family: var(--mono);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--blue-down);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
}

.text-link:hover { color: var(--ink); }

/* ── Contact ───────────────────────────────────────────────────────────── */

.section--contact h2 { max-width: 22ch; }

/* ── Footer ────────────────────────────────────────────────────────────── */

.site-footer {
  background: var(--ink-2);
  color: var(--muted-on-dark);
  border-top: 1px solid var(--line-on-dark);
  padding: 1.5rem 0;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.7rem 1.8rem;
}

.site-footer a {
  color: var(--muted-on-dark);
  text-decoration: none;
}

.site-footer a:hover { color: var(--amber); }

/* ── Responsive / motion ───────────────────────────────────────────────── */

@media (max-width: 880px) {
  .site-nav { display: none; }
  .lang-switch { margin-left: auto; }
  .about-grid { grid-template-columns: 1fr; gap: 1.6rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn, .card, .client-wall a { transition: none; }
  .btn:hover, .card:hover, .client-wall a:hover { transform: none; }
}