/*
Theme Name: SignBridge
Theme URI: https://signbridge.example
Author: SignaNova Solutions d.o.o.
Author URI: https://signbridge.example
Description: Landing page theme for SignBridge, the real-time speech-to-sign-language translation platform. Dark indigo brand system with cyan accent, matching the SignBridge iOS identity.
Version: 1.0.0
Requires at least: 6.0
Tested up to: 6.7
Requires PHP: 8.0
License: Proprietary
License URI: https://signbridge.example/license
Text Domain: signbridge
*/

/* ---------------------------------------------------------------
   Tokens
--------------------------------------------------------------- */
:root {
  /* Brand (from SignBridge iOS icon/splash system) */
  --sb-indigo-deep: #14103f;
  --sb-indigo: #241e6b;
  --sb-violet: #7c3aed;
  --sb-cyan: #22d3ee;
  --sb-cyan-dim: rgba(34, 211, 238, 0.14);

  /* Surfaces & text */
  --sb-paper: #f5f4ff;
  --sb-ink: #1a1633;
  --sb-text-on-dark: #e9e7fa;
  --sb-muted-on-dark: #a8a3ce;
  --sb-muted-on-light: #5b5580;
  --sb-line-on-dark: rgba(233, 231, 250, 0.14);
  --sb-line-on-light: rgba(26, 22, 51, 0.12);

  /* Type */
  --sb-font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --sb-font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* Rhythm */
  --sb-max: 1120px;
  --sb-pad: clamp(20px, 5vw, 48px);
  --sb-section: clamp(72px, 12vw, 140px);
  --sb-radius: 14px;
}

/* ---------------------------------------------------------------
   Base
--------------------------------------------------------------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  font-family: var(--sb-font-body);
  font-size: 17px;
  line-height: 1.65;
  color: var(--sb-text-on-dark);
  background: var(--sb-indigo-deep);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; }
a { color: var(--sb-cyan); }
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--sb-cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

.sb-wrap { max-width: var(--sb-max); margin: 0 auto; padding-left: var(--sb-pad); padding-right: var(--sb-pad); }

.screen-reader-text {
  position: absolute !important;
  width: 1px; height: 1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* ---------------------------------------------------------------
   Header
--------------------------------------------------------------- */
.sb-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(20, 16, 63, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--sb-line-on-dark);
}
.sb-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 68px;
}
.sb-logo {
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -0.02em;
  text-decoration: none;
  color: #fff;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.sb-logo strong { color: #fff; font-weight: 800; }
.sb-logo span { color: var(--sb-cyan); font-weight: 800; }
.sb-logo__mark { display: inline-flex; align-items: flex-end; gap: 2px; height: 18px; }
.sb-logo__mark i {
  display: block; width: 3px; border-radius: 2px;
  background: var(--sb-cyan);
}
.sb-logo__mark i:nth-child(1) { height: 7px; }
.sb-logo__mark i:nth-child(2) { height: 12px; }
.sb-logo__mark i:nth-child(3) { height: 18px; }
.sb-logo__mark i:nth-child(4) { height: 10px; background: #fff; }

.sb-nav ul { list-style: none; display: flex; gap: 28px; margin: 0; padding: 0; }
.sb-nav a {
  color: var(--sb-muted-on-dark);
  text-decoration: none;
  font-size: 15px;
  font-weight: 600;
}
.sb-nav a:hover { color: #fff; }

.sb-header__cta {
  display: inline-block;
  background: var(--sb-cyan);
  color: var(--sb-indigo-deep);
  font-weight: 700;
  font-size: 15px;
  padding: 9px 18px;
  border-radius: 999px;
  text-decoration: none;
}
.sb-header__cta:hover { filter: brightness(1.08); }

@media (max-width: 760px) {
  .sb-nav { display: none; }
}

/* ---------------------------------------------------------------
   Hero
--------------------------------------------------------------- */
.sb-hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(1100px 600px at 80% -10%, rgba(124, 58, 237, 0.45), transparent 60%),
    radial-gradient(800px 500px at 10% 110%, rgba(34, 211, 238, 0.12), transparent 55%),
    linear-gradient(160deg, var(--sb-indigo) 0%, var(--sb-indigo-deep) 70%);
  padding: clamp(72px, 11vw, 130px) 0 clamp(56px, 8vw, 100px);
}
.sb-eyebrow {
  font-family: var(--sb-font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--sb-cyan);
  margin: 0 0 20px;
}
.sb-hero h1 {
  font-size: clamp(38px, 6vw, 68px);
  line-height: 1.05;
  letter-spacing: -0.03em;
  font-weight: 800;
  margin: 0 0 22px;
  max-width: 15ch;
  color: #fff;
}
.sb-hero h1 em {
  font-style: normal;
  background: linear-gradient(90deg, var(--sb-cyan), #8be9ff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.sb-hero__lede {
  font-size: clamp(17px, 2vw, 20px);
  color: var(--sb-muted-on-dark);
  max-width: 56ch;
  margin: 0 0 34px;
}
.sb-hero__actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: clamp(48px, 7vw, 80px); }
.sb-btn {
  display: inline-block;
  padding: 14px 26px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 16px;
  text-decoration: none;
}
.sb-btn--primary { background: var(--sb-cyan); color: var(--sb-indigo-deep); }
.sb-btn--primary:hover { filter: brightness(1.08); }
.sb-btn--ghost { border: 1px solid var(--sb-line-on-dark); color: var(--sb-text-on-dark); }
.sb-btn--ghost:hover { border-color: var(--sb-cyan); color: var(--sb-cyan); }

/* Pipeline strip — signature element.
   Speech (waveform) → gloss (mono caps) → signing (avatar chip).
   Mirrors the app icon: waveform bars becoming a signing hand. */
.sb-pipe {
  border: 1px solid var(--sb-line-on-dark);
  background: rgba(20, 16, 63, 0.55);
  border-radius: var(--sb-radius);
  padding: clamp(20px, 3vw, 32px);
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: center;
  gap: clamp(12px, 2vw, 24px);
}
.sb-pipe__stage { min-width: 0; }
.sb-pipe__label {
  font-family: var(--sb-font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--sb-muted-on-dark);
  margin: 0 0 12px;
}
.sb-pipe__arrow {
  color: var(--sb-cyan);
  font-size: 20px;
  line-height: 1;
  user-select: none;
}
.sb-pipe__speech {
  font-size: 16px;
  color: #fff;
  font-weight: 600;
  min-height: 1.6em;
}
.sb-wave { display: flex; align-items: center; gap: 3px; height: 26px; margin-top: 10px; }
.sb-wave i {
  width: 3px; border-radius: 2px; background: var(--sb-cyan);
  height: 30%;
  animation: sb-wave 1.1s ease-in-out infinite;
}
.sb-wave i:nth-child(odd) { animation-delay: 0.15s; }
.sb-wave i:nth-child(3n) { animation-delay: 0.3s; }
.sb-wave i:nth-child(4n) { animation-delay: 0.45s; }
@keyframes sb-wave {
  0%, 100% { height: 25%; }
  50% { height: 95%; }
}
@media (prefers-reduced-motion: reduce) {
  .sb-wave i { height: 60%; animation: none; }
  .sb-wave i:nth-child(odd) { height: 35%; }
}

.sb-pipe__gloss {
  font-family: var(--sb-font-mono);
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--sb-cyan);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  min-height: 2em;
}
.sb-pipe__gloss span {
  border: 1px solid rgba(34, 211, 238, 0.35);
  background: var(--sb-cyan-dim);
  border-radius: 6px;
  padding: 3px 8px;
}
.sb-pipe__avatar {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--sb-text-on-dark);
  font-weight: 600;
  font-size: 15px;
}
.sb-hand {
  flex: none;
  width: 46px; height: 46px;
  border-radius: 12px;
  background: linear-gradient(150deg, var(--sb-violet), var(--sb-indigo));
  display: grid;
  place-items: center;
  font-size: 22px;
}

@media (max-width: 860px) {
  .sb-pipe { grid-template-columns: 1fr; }
  .sb-pipe__arrow { transform: rotate(90deg); justify-self: start; }
}

/* ---------------------------------------------------------------
   Sections
--------------------------------------------------------------- */
.sb-section { padding: var(--sb-section) 0; }
.sb-section--paper { background: var(--sb-paper); color: var(--sb-ink); }
.sb-section--paper .sb-eyebrow { color: var(--sb-violet); }

.sb-h2 {
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.12;
  letter-spacing: -0.025em;
  font-weight: 800;
  margin: 0 0 18px;
  max-width: 22ch;
}
.sb-section--paper .sb-h2 { color: var(--sb-ink); }
.sb-sub {
  font-size: 18px;
  max-width: 62ch;
  margin: 0 0 clamp(36px, 5vw, 56px);
}
.sb-section .sb-sub { color: var(--sb-muted-on-dark); }
.sb-section--paper .sb-sub { color: var(--sb-muted-on-light); }

/* Steps — real pipeline order, so numbering carries meaning */
.sb-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  counter-reset: step;
}
.sb-step {
  background: #fff;
  border: 1px solid var(--sb-line-on-light);
  border-radius: var(--sb-radius);
  padding: 28px 26px;
  position: relative;
}
.sb-step::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  font-family: var(--sb-font-mono);
  font-size: 13px;
  color: var(--sb-violet);
  letter-spacing: 0.1em;
  display: block;
  margin-bottom: 14px;
}
.sb-step h3 { margin: 0 0 10px; font-size: 20px; letter-spacing: -0.01em; color: var(--sb-ink); }
.sb-step p { margin: 0; font-size: 15.5px; color: var(--sb-muted-on-light); }
@media (max-width: 860px) { .sb-steps { grid-template-columns: 1fr; } }

/* Tech grid */
.sb-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}
.sb-card {
  border: 1px solid var(--sb-line-on-dark);
  border-radius: var(--sb-radius);
  background: rgba(36, 30, 107, 0.35);
  padding: 30px 28px;
}
.sb-card h3 { margin: 0 0 10px; font-size: 20px; letter-spacing: -0.01em; color: #fff; }
.sb-card p { margin: 0; font-size: 15.5px; color: var(--sb-muted-on-dark); }
.sb-card__tag {
  font-family: var(--sb-font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--sb-cyan);
  display: block;
  margin-bottom: 12px;
}
@media (max-width: 760px) { .sb-grid { grid-template-columns: 1fr; } }

/* Fallback explainer */
.sb-fallback {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(28px, 5vw, 64px);
  align-items: center;
}
.sb-fallback__demo {
  border: 1px solid var(--sb-line-on-light);
  border-radius: var(--sb-radius);
  background: #fff;
  padding: 26px;
  font-family: var(--sb-font-mono);
  font-size: 14px;
  color: var(--sb-ink);
}
.sb-fallback__demo .row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.sb-fallback__demo .row:last-child { margin-bottom: 0; }
.sb-fallback__demo .lbl {
  flex-basis: 100%;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--sb-muted-on-light);
}
.sb-chip {
  border-radius: 6px;
  padding: 3px 9px;
  border: 1px solid var(--sb-line-on-light);
  background: var(--sb-paper);
}
.sb-chip--fs {
  border-color: rgba(124, 58, 237, 0.4);
  background: rgba(124, 58, 237, 0.08);
  color: var(--sb-violet);
}
@media (max-width: 860px) { .sb-fallback { grid-template-columns: 1fr; } }

/* Roadmap */
.sb-phases { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.sb-phase {
  border-radius: var(--sb-radius);
  padding: 32px 30px;
  border: 1px solid var(--sb-line-on-dark);
}
.sb-phase--now { background: linear-gradient(150deg, rgba(124, 58, 237, 0.28), rgba(36, 30, 107, 0.5)); }
.sb-phase--next { background: rgba(36, 30, 107, 0.3); }
.sb-phase__badge {
  font-family: var(--sb-font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 999px;
  display: inline-block;
  margin-bottom: 16px;
}
.sb-phase--now .sb-phase__badge { background: var(--sb-cyan); color: var(--sb-indigo-deep); }
.sb-phase--next .sb-phase__badge { border: 1px solid var(--sb-line-on-dark); color: var(--sb-muted-on-dark); }
.sb-phase h3 { margin: 0 0 12px; font-size: 22px; color: #fff; letter-spacing: -0.01em; }
.sb-phase ul { margin: 0; padding-left: 18px; color: var(--sb-muted-on-dark); font-size: 15.5px; }
.sb-phase li { margin-bottom: 8px; }
@media (max-width: 760px) { .sb-phases { grid-template-columns: 1fr; } }

/* CTA */
.sb-cta {
  text-align: center;
  background:
    radial-gradient(700px 400px at 50% 120%, rgba(34, 211, 238, 0.15), transparent 60%),
    linear-gradient(160deg, var(--sb-indigo) 0%, var(--sb-indigo-deep) 80%);
  border-top: 1px solid var(--sb-line-on-dark);
}
.sb-cta .sb-h2 { margin-left: auto; margin-right: auto; }
.sb-cta .sb-sub { margin-left: auto; margin-right: auto; }

/* Footer */
.sb-footer {
  border-top: 1px solid var(--sb-line-on-dark);
  padding: 40px 0;
  font-size: 14px;
  color: var(--sb-muted-on-dark);
}
.sb-footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: space-between;
  align-items: center;
}
.sb-footer a { color: var(--sb-muted-on-dark); text-decoration: none; }
.sb-footer a:hover { color: var(--sb-cyan); }

/* Scroll reveal (JS adds .is-in) */
.sb-reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.6s ease, transform 0.6s ease; }
.sb-reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .sb-reveal { opacity: 1; transform: none; }
}

/* Generic inner pages (page.php / index.php fallback) */
.sb-article { padding: var(--sb-section) 0; }
.sb-article .sb-wrap { max-width: 760px; }
.sb-article h1 { font-size: clamp(30px, 4vw, 44px); letter-spacing: -0.02em; }