/* ─────────────────────────────────────────────────────────────
   tackit.tech — Tack landing site
   Brand tokens mirror Tack/Brand/Colors.swift + Brandbook §03
   ───────────────────────────────────────────────────────────── */

:root {
  --abyss:    #05080F;
  --deep:     #0B1119;
  --hull:     #131B26;
  --sail:     #E8F0F5;
  --spark:    #5DE8E2;
  --sand:     #E8B86F;

  --sail-40:  rgba(232, 240, 245, 0.40);
  --sail-55:  rgba(232, 240, 245, 0.55);
  --sail-70:  rgba(232, 240, 245, 0.70);
  --sail-30:  rgba(232, 240, 245, 0.30);
  --hairline: rgba(232, 240, 245, 0.06);
  --hairline-strong: rgba(232, 240, 245, 0.12);
  --spark-08: rgba(93, 232, 226, 0.08);
  --spark-25: rgba(93, 232, 226, 0.25);

  --font-display: 'Inter Tight', system-ui, -apple-system, sans-serif;
  --font-body:    'IBM Plex Sans', system-ui, -apple-system, sans-serif;
  --font-mono:    'IBM Plex Mono', ui-monospace, 'SF Mono', monospace;

  --content-width: 1100px;
  --gutter: 24px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html {
  background: var(--abyss);
  scroll-behavior: smooth;
}

body {
  background: var(--abyss);
  color: var(--sail);
  font-family: var(--font-body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

a {
  color: var(--spark);
  text-decoration: none;
  transition: opacity 0.15s ease;
}
a:hover { opacity: 0.75; }

/* ── Layout primitives ─────────────────────────────────────── */

.container {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

section { padding: 96px 0; border-top: 1px solid var(--hairline); }
section:first-of-type { border-top: 0; }

.label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  color: var(--sail-40);
}
.accent { color: var(--spark); }

/* ── Site chrome ───────────────────────────────────────────── */

.site-header {
  padding: 28px 0;
  border-bottom: 1px solid var(--hairline);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.wordmark {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 20px;
  letter-spacing: -0.6px;
  color: var(--sail);
}
.wordmark .dot { color: var(--spark); }
.nav {
  display: flex;
  gap: 24px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
}
.nav a { color: var(--sail-55); }
.nav a:hover { color: var(--sail); opacity: 1; }
.nav a.lang-switch {
  margin-left: 4px;
  padding: 4px 9px;
  border: 1px solid var(--hairline-strong);
  border-radius: 6px;
  color: var(--sail-70);
}
.nav a.lang-switch:hover { color: var(--spark); border-color: var(--spark-25); opacity: 1; }

.site-footer {
  padding: 48px 0 64px;
  border-top: 1px solid var(--hairline);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.6px;
  color: var(--sail-40);
}
.site-footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.site-footer .credit { letter-spacing: 1.2px; text-transform: uppercase; }
.site-footer nav { display: flex; gap: 18px; }
.site-footer nav a { color: var(--sail-55); }

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

.hero {
  padding-top: 96px;
  padding-bottom: 96px;
  border-top: 0;
  position: relative;
  overflow: hidden;
  min-height: 720px;
}
.hero-scene {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  width: 100%;
  height: 100%;
}
.hero .container {
  position: relative;
  z-index: 2;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 56px;
  align-items: start;
}
.hero h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 64px;
  line-height: 0.95;
  letter-spacing: -2.4px;
  margin-top: 22px;
  max-width: 12ch;
}
.hero h1 .dot { color: var(--spark); }
.hero .lead {
  margin-top: 22px;
  font-size: 17px;
  line-height: 1.55;
  color: var(--sail-70);
  max-width: 44ch;
}
.hero .cta {
  margin-top: 28px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* Readout: distilled "where am I" widget — equal-weight hero element */
.readout {
  display: grid;
  grid-template-columns: auto 1px 1fr;
  align-items: center;
  gap: 24px;
  padding: 24px 0 24px 4px;
  border-top: 1px solid var(--hairline-strong);
  border-bottom: 1px solid var(--hairline-strong);
  justify-self: end;
  max-width: 100%;
  margin-top: 8px;
}
.readout .compass {
  width: 120px;
  height: 120px;
  flex-shrink: 0;
}
.readout .vrule {
  width: 1px;
  height: 96px;
  background: var(--hairline-strong);
}
.readout .figures .label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1.6px;
  text-transform: uppercase;
  color: var(--sail-40);
  margin-bottom: 12px;
}
.readout .figures .label .accent { color: var(--spark); }
.readout .figures .amount {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 44px;
  letter-spacing: 0;
  color: var(--sail);
  line-height: 1;
}
.readout .figures .sub {
  margin-top: 12px;
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--sail-55);
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  align-items: baseline;
}
.readout .figures .sub .dim { color: var(--sail-40); }
.readout .figures .sub .num {
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--sail);
}

/* App Store badge placeholder until the app ships */
.badge-soon {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 20px;
  border: 1px solid var(--hairline-strong);
  border-radius: 12px;
  background: var(--deep);
  color: var(--sail);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 1.4px;
  text-transform: uppercase;
}
.badge-soon::before {
  content: '';
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--spark);
  box-shadow: 0 0 0 4px var(--spark-08);
}
.badge-soon .meta {
  color: var(--sail-55);
  letter-spacing: 1.2px;
}

/* ── Principles grid ───────────────────────────────────────── */

.principles { background: var(--deep); border-top-color: transparent; border-bottom: 1px solid var(--hairline); }
.principles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
  margin-top: 32px;
}
.principle h3 {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 1.6px;
  text-transform: uppercase;
  color: var(--spark);
  margin-bottom: 14px;
}
.principle .vs {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 22px;
  letter-spacing: -0.4px;
  line-height: 1.25;
  color: var(--sail);
  margin-bottom: 12px;
}
.principle p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--sail-70);
}

/* ── Phones row (placeholder for screenshots) ──────────────── */

.phones {
  padding-top: 96px;
  padding-bottom: 96px;
}
.phones h2 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 36px;
  letter-spacing: -1.2px;
  line-height: 1.05;
  margin-top: 12px;
  max-width: 22ch;
}
.phones .screens {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 240px));
  justify-content: center;
  gap: 32px;
  margin-top: 56px;
}
.phone-frame {
  aspect-ratio: 393 / 852;
  width: 100%;
  max-width: 240px;
  background: var(--abyss);
  border: 1px solid var(--hairline-strong);
  border-radius: 24px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  color: var(--sail-30);
}
.phone-frame img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

/* ── Doc pages (privacy / support) ─────────────────────────── */

.doc {
  padding: 72px 0 96px;
  max-width: 720px;
  margin: 0 auto;
}
.doc h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 48px;
  letter-spacing: -1.6px;
  line-height: 1.05;
  margin-bottom: 8px;
}
.doc h1 .dot { color: var(--spark); }
.doc .updated {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--sail-40);
  margin-bottom: 48px;
}
.doc h2 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 22px;
  letter-spacing: -0.4px;
  line-height: 1.2;
  margin-top: 48px;
  margin-bottom: 16px;
}
.doc p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--sail-70);
  margin-bottom: 14px;
}
.doc strong { color: var(--sail); font-weight: 500; }
.doc ul {
  margin: 0 0 14px 24px;
  color: var(--sail-70);
  font-size: 15px;
  line-height: 1.7;
}
.doc ul li { margin-bottom: 6px; }
.doc code {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--spark-08);
  color: var(--spark);
  padding: 2px 6px;
  border-radius: 4px;
}
.doc .lang-divider {
  margin: 64px 0 32px;
  border-top: 1px solid var(--hairline);
  padding-top: 32px;
}
.doc .lang-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--sail-40);
  margin-bottom: 24px;
}

/* ── Errors page ───────────────────────────────────────────── */

.error-page {
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 64px 24px;
}
.error-page .code {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  color: var(--sail-40);
}
.error-page h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 64px;
  letter-spacing: -2.4px;
  line-height: 1;
  margin: 16px 0;
}
.error-page h1 .dot { color: var(--spark); }
.error-page p { color: var(--sail-55); margin-top: 8px; }
.error-page a {
  display: inline-block;
  margin-top: 32px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  padding: 12px 18px;
  border: 1px solid var(--spark);
  border-radius: 8px;
}

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

@media (max-width: 720px) {
  :root { --gutter: 18px; }
  section { padding: 56px 0; }

  .hero { padding-top: 56px; padding-bottom: 56px; min-height: 0; }
  .hero h1 { font-size: 44px; letter-spacing: -1.6px; }
  .hero .lead { font-size: 16px; margin-top: 20px; }
  .hero .cta { margin-top: 28px; }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-scene { opacity: 0.55; }
  .readout {
    justify-self: stretch;
    grid-template-columns: auto 1px 1fr;
    gap: 18px;
    padding: 20px 0;
  }
  .readout .compass { width: 88px; height: 88px; }
  .readout .vrule { height: 76px; }
  .readout .figures .amount { font-size: 32px; letter-spacing: 0; }
  .readout .figures .sub { font-size: 12px; }

  .principles-grid { grid-template-columns: 1fr; gap: 32px; }
  .principle .vs { font-size: 20px; }

  .phones { padding-top: 56px; padding-bottom: 56px; }
  .phones h2 { font-size: 26px; letter-spacing: -0.8px; }
  .phones .screens {
    grid-template-columns: minmax(0, 220px);
    justify-content: center;
    gap: 24px;
    margin-top: 40px;
  }

  .doc { padding: 40px 0 64px; }
  .doc h1 { font-size: 32px; letter-spacing: -1px; }
  .doc h2 { font-size: 19px; margin-top: 32px; }

  .site-footer { padding: 32px 0 48px; }
  .site-footer .container { flex-direction: column; align-items: flex-start; gap: 16px; }

  .error-page h1 { font-size: 44px; letter-spacing: -1.4px; }
}