/* ============================================================
   tethr.io — industrial-minimalist marketing site
   Sharp edges only · hairline rules · single crimson signal
   ============================================================ */

:root {
  --bg:        #050505;
  --surface:   #111111;
  --text:      #F4F4F0;
  --muted:     #7A7A75;
  --hairline:  #2A2A2A;
  --accent:    #A6303C; /* crimson — CTA + hero cursor dot ONLY */

  --font-display: "Archivo", "Arial Black", sans-serif;
  --font-body:    "Inter", system-ui, sans-serif;
  --font-mono:    "IBM Plex Mono", ui-monospace, monospace;

  --pad: clamp(20px, 5vw, 88px); /* horizontal gutter */
  --maxw: 1320px;
}

/* ---------- reset ---------- */
*,*::before,*::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ol, ul { list-style: none; }

/* Nothing is round. Nothing floats. */
* { border-radius: 0; box-shadow: none; }

/* ---------- shared type helpers ---------- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted);
}

.section-head {
  padding: clamp(56px, 9vw, 120px) var(--pad) clamp(28px, 4vw, 48px);
  max-width: var(--maxw);
  margin: 0 auto;
}
.section-title {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.02;
  font-size: clamp(1.9rem, 5vw, 3.4rem);
  margin-top: 18px;
  max-width: 16ch;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5ch;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 14px 20px;
  border: 1px solid transparent;
  line-height: 1;
  white-space: nowrap;
  transition: background-color .18s ease, color .18s ease, border-color .18s ease;
}
.btn--solid {
  background: var(--accent);
  color: var(--text);
  border-color: var(--accent);
}
.btn--solid:hover { background: #8f2833; border-color: #8f2833; }

.btn--outline {
  background: transparent;
  color: var(--text);
  border-color: var(--accent);
}
.btn--outline:hover { background: var(--accent); }

.btn--ghost {
  background: transparent;
  color: var(--muted);
  border-color: var(--hairline);
}
.btn--ghost:hover { color: var(--text); border-color: var(--text); }

.btn--lg { padding: 18px 26px; font-size: 14px; }

/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(5,5,5,0.86);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--hairline);
}
.nav__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px var(--pad);
  display: flex;
  align-items: center;
  gap: 24px;
}
.nav__brand { display: flex; align-items: center; }
.nav__logo { height: 30px; width: auto; }

.nav__links {
  margin-left: auto;
  display: flex;
  gap: 30px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted);
}
.nav__links a { position: relative; padding: 4px 0; transition: color .18s ease; }
.nav__links a:hover { color: var(--text); }

.nav__cta { margin-left: 4px; }

/* On small screens: keep wordmark + CTA, drop the text links */
@media (max-width: 720px) {
  .nav__links { display: none; }
  .nav__cta { margin-left: auto; }
  .btn { padding: 12px 15px; font-size: 12px; }
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  border-bottom: 1px solid var(--hairline);
}
.hero__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(48px, 8vw, 104px) var(--pad) clamp(56px, 9vw, 112px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(40px, 6vw, 72px);
  align-items: center;
}
@media (min-width: 960px) {
  .hero__inner {
    grid-template-columns: 1.15fr 0.85fr;
  }
}

.hero__headline {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.035em;
  line-height: 0.96;
  font-size: clamp(2.6rem, 8.4vw, 6rem);
  margin: 26px 0 0;
  max-width: 14ch;
}
.hero__subhead {
  color: var(--muted);
  font-size: clamp(1rem, 1.6vw, 1.25rem);
  line-height: 1.5;
  margin-top: 26px;
  max-width: 46ch;
}
.hero__actions {
  margin-top: 38px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- HUD WhatsApp readout ---------- */
.hud {
  background: var(--surface);
  border: 1px solid var(--hairline);
  width: 100%;
  position: relative;
}
/* corner ticks — spec-readout feel */
.hud::before, .hud::after {
  content: "";
  position: absolute;
  width: 9px; height: 9px;
  border: 1px solid var(--muted);
  pointer-events: none;
}
.hud::before { top: -1px; left: -1px; border-right: 0; border-bottom: 0; }
.hud::after  { bottom: -1px; right: -1px; border-left: 0; border-top: 0; }

.hud__bar {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--hairline);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}
.hud__meta { margin-left: auto; color: var(--text); }
.hud__sep { color: var(--muted); margin: 0 0.4ch; }
#hud-lang { color: var(--text); }
.hud__status { display: inline-flex; align-items: center; gap: 8px; }
.hud__pip {
  width: 7px; height: 7px;
  background: var(--text);
  display: inline-block;
}

.hud__body {
  padding: 20px 16px;
  min-height: 246px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  justify-content: flex-start;
}

.msg { max-width: 88%; }
.msg--out { align-self: flex-end; text-align: right; }
.msg__label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 6px;
}
.msg__text {
  border: 1px solid var(--hairline);
  padding: 11px 14px;
  font-size: 14.5px;
  line-height: 1.45;
  min-height: 1.45em;
  color: var(--text);
}
.msg--in  .msg__text { background: #0c0c0c; }
.msg--out .msg__text { background: #161616; border-color: #333; }

/* the one crimson cursor dot */
.cursor {
  display: inline-block;
  width: 9px; height: 9px;
  border-radius: 50%;            /* a literal dot — the brand's standalone dot */
  background: var(--accent);
  margin-left: 6px;
  vertical-align: middle;
  animation: blink 1s steps(1) infinite;
}
@keyframes blink { 0%,50% { opacity: 1; } 50.01%,100% { opacity: 0; } }

.hud__foot {
  display: flex;
  justify-content: space-between;
  padding: 11px 16px;
  border-top: 1px solid var(--hairline);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ============================================================
   SERVICES
   ============================================================ */
.services { border-bottom: 1px solid var(--hairline); }

.svc-list {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--pad) clamp(40px, 6vw, 72px);
}
.svc {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px 40px;
  padding: clamp(28px, 3.6vw, 40px) 0;
  border-top: 1px solid var(--hairline);
}
.svc:first-child { border-top: 0; }

.svc__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--muted);
  align-self: start;
  padding-top: 4px;
}
.svc__title {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.05;
  font-size: clamp(1.35rem, 2.8vw, 2rem);
}
.svc__desc {
  color: var(--muted);
  font-size: clamp(1rem, 1.4vw, 1.1rem);
  max-width: 52ch;
}

@media (min-width: 760px) {
  .svc {
    grid-template-columns: 110px minmax(0, 1.1fr) minmax(0, 1.3fr);
    align-items: baseline;
    gap: 40px;
  }
  .svc__num { padding-top: 0; }
}
.svc:hover .svc__title { color: var(--text); }
.svc { transition: background-color .2s ease; }
.svc:hover { background: #0a0a0a; }

/* ============================================================
   TRUST STRIP
   ============================================================ */
.trust {
  border-bottom: 1px solid var(--hairline);
  background: var(--surface);
}
.trust__list {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(22px, 3vw, 34px) var(--pad);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 14px 22px;
  font-family: var(--font-mono);
  font-size: clamp(11px, 1.3vw, 13px);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text);
}
.trust__dot { color: var(--muted); }

/* ============================================================
   CONTACT
   ============================================================ */
.contact__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(64px, 11vw, 160px) var(--pad);
}
.contact__title {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.035em;
  line-height: 0.98;
  font-size: clamp(2.3rem, 7vw, 5rem);
  margin-top: 20px;
  max-width: 18ch;
}
.contact__sub {
  color: var(--muted);
  font-size: clamp(1rem, 1.6vw, 1.2rem);
  margin-top: 24px;
  max-width: 50ch;
}
.contact__actions {
  margin-top: 42px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 22px;
}
.contact__email {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid var(--hairline);
  padding-bottom: 3px;
  transition: color .18s ease, border-color .18s ease;
}
.contact__email:hover { color: var(--text); border-color: var(--text); }

/* ============================================================
   FOOTER
   ============================================================ */
.foot { border-top: 1px solid var(--hairline); }
.foot__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 26px var(--pad);
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted);
}
.foot__mark { color: var(--text); display: inline-flex; align-items: center; }
.foot__brackets { color: var(--muted); margin-left: 0.6ch; }
.foot__dot {
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--muted); display: inline-block; margin-left: 0.6ch;
}

/* ============================================================
   MOTION PREFERENCE
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .cursor { animation: none; }
  * { transition: none !important; }
}