/* MotionBridge landing — no external assets, system fonts only */

:root {
  --bg: #0f1317;
  --panel: #171d24;
  --border: #2b3542;
  --text: #e8eef4;
  --muted: #8ea0b5;
  --accent: #35d0a5;
  --danger: #ff5f56;
  --bone: #7d93aa;
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "Cascadia Mono", "SF Mono", Consolas, "Liberation Mono", monospace;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

::selection { background: var(--accent); color: var(--bg); }

a { color: inherit; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.container {
  width: 100%;
  max-width: 1040px;
  margin-inline: auto;
  padding-inline: clamp(20px, 5vw, 48px);
}

/* ---------- header ---------- */

.site-head {
  padding-block: 22px;
}

.site-head .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.brand svg { display: block; }

.head-link {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
}

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

/* ---------- hero ---------- */

.hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(40px, 6vw, 64px);
  align-items: center;
  padding-block: clamp(40px, 8vh, 88px);
}

.hero h1 {
  font-size: clamp(2.35rem, 7.5vw, 3.9rem);
  line-height: 1.04;
  letter-spacing: -0.035em;
  font-weight: 700;
  max-width: 11ch;
}

.hero-sub {
  color: var(--muted);
  font-size: clamp(1rem, 1.6vw, 1.12rem);
  max-width: 44ch;
  margin-top: 20px;
}

.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--accent);
  color: #08201a;
}

.btn-primary:hover { background: #4adfb6; }

.btn-ghost {
  background: var(--panel);
  border-color: var(--border);
  color: var(--text);
}

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

.hero-visual { min-width: 0; }

.hero-visual svg {
  display: block;
  width: 100%;
  max-width: 560px;
  height: auto;
  margin-inline: auto;
}

@media (min-width: 900px) {
  .hero { grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); }
}

/* ---------- hero SVG parts ---------- */

.svg-frame { fill: var(--panel); stroke: var(--border); stroke-width: 1.5; }
.svg-divider { stroke: var(--border); stroke-width: 1; }
.svg-label {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  fill: var(--muted);
}
.rec-dot { fill: var(--danger); }
.zone-base { fill: none; stroke: var(--border); stroke-width: 1.5; stroke-dasharray: 5 5; }
.zone-glow rect { fill: rgba(53, 208, 165, 0.12); stroke: var(--accent); stroke-width: 1.5; }
.bone { stroke: var(--bone); stroke-width: 2.5; stroke-linecap: round; }
.joint { fill: var(--text); }
.joint-key { fill: var(--accent); }
.lane-tick { stroke: var(--border); stroke-width: 3; stroke-linecap: round; }
.wire { stroke: var(--muted); stroke-width: 2; stroke-linecap: round; stroke-dasharray: 1.5 8; }
.packet { fill: var(--accent); }
.phone-screen { fill: #0c1014; stroke: var(--border); stroke-width: 1; }
.phone-detail { fill: var(--border); }
.ripple-dot { fill: var(--accent); }
.ripple-ring { fill: none; stroke: var(--accent); stroke-width: 1.5; }

/* ---------- hero animation: one 9s story loop ----------
   idle -> step left -> zone L fires -> packet -> tap ripple
        -> step right -> zone R fires -> packet -> tap ripple  */

.fig, .zone-glow, .packet, .ripple, .wire, .rec-dot {
  animation-duration: 9s;
  animation-iteration-count: infinite;
  animation-timing-function: ease-in-out;
}

.ripple, .packet {
  transform-box: fill-box;
  transform-origin: center;
}

.fig { animation-name: fig-step; }
@keyframes fig-step {
  0%, 8%   { transform: translateX(0); }
  15%, 45% { transform: translateX(-62px); }
  52%, 57% { transform: translateX(0); }
  64%, 90% { transform: translateX(62px); }
  97%, 100% { transform: translateX(0); }
}

.zone-glow-l { animation-name: zone-l; }
@keyframes zone-l {
  0%, 13%  { opacity: 0.15; }
  17%, 44% { opacity: 1; }
  50%, 100% { opacity: 0.15; }
}

.zone-glow-r { animation-name: zone-r; }
@keyframes zone-r {
  0%, 62%  { opacity: 0.15; }
  66%, 89% { opacity: 1; }
  95%, 100% { opacity: 0.15; }
}

.packet { animation-name: packet-run; animation-timing-function: linear; }
@keyframes packet-run {
  0%, 16%  { opacity: 0; transform: translateX(0); }
  18%      { opacity: 1; }
  27%      { opacity: 1; transform: translateX(86px); }
  29%, 65% { opacity: 0; transform: translateX(0); }
  67%      { opacity: 1; }
  76%      { opacity: 1; transform: translateX(86px); }
  78%, 100% { opacity: 0; transform: translateX(0); }
}

.ripple-l { animation-name: ripple-l; }
@keyframes ripple-l {
  0%, 25%  { opacity: 0; transform: scale(0.3); }
  29%      { opacity: 0.95; transform: scale(0.6); }
  42%      { opacity: 0; transform: scale(1.25); }
  43%, 100% { opacity: 0; transform: scale(0.3); }
}

.ripple-r { animation-name: ripple-r; }
@keyframes ripple-r {
  0%, 74%  { opacity: 0; transform: scale(0.3); }
  78%      { opacity: 0.95; transform: scale(0.6); }
  91%      { opacity: 0; transform: scale(1.25); }
  92%, 100% { opacity: 0; transform: scale(0.3); }
}

.wire { animation-name: dash-flow; animation-timing-function: linear; }
@keyframes dash-flow {
  to { stroke-dashoffset: -38; }
}

.rec-dot { animation-name: rec-pulse; }
@keyframes rec-pulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.35; }
}

/* Static base state (used when motion is reduced) shows the
   left zone firing so the diagram still tells the story. */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .fig, .zone-glow, .packet, .ripple, .wire, .rec-dot { animation: none; }
  .fig { transform: translateX(-62px); }
  .zone-glow-l { opacity: 1; }
  .zone-glow-r { opacity: 0.15; }
  .packet { opacity: 0.9; transform: translateX(43px); }
  .ripple-l { opacity: 0.7; transform: scale(0.8); }
  .ripple-r { opacity: 0; }
}

/* ---------- features ---------- */

.features {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  padding-block: clamp(16px, 3vh, 32px);
}

@media (min-width: 720px) {
  .features { grid-template-columns: repeat(3, 1fr); }
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px 22px;
}

.card svg { display: block; margin-bottom: 14px; }

.card h2 {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.card p {
  color: var(--muted);
  font-size: 0.92rem;
  margin-top: 6px;
}

.icon-stroke { fill: none; stroke: var(--muted); stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.icon-accent { fill: var(--accent); }

/* ---------- how it works ---------- */

.how { padding-block: clamp(40px, 7vh, 72px); }

.how-title {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 24px;
}

.steps {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

@media (min-width: 720px) {
  .steps { grid-template-columns: repeat(3, 1fr); gap: 28px; }
}

.steps li {
  border-top: 1px solid var(--border);
  padding-top: 14px;
  display: flex;
  gap: 12px;
  align-items: baseline;
  font-size: 0.95rem;
}

.step-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
}

/* ---------- footer ---------- */

.site-foot {
  margin-top: auto;
  border-top: 1px solid var(--border);
  padding-block: 26px;
  text-align: center;
  color: var(--muted);
  font-size: 0.88rem;
}

.site-foot a {
  color: var(--muted);
  text-underline-offset: 3px;
}

.site-foot a:hover { color: var(--text); }