/*
  Shared shell + design tokens — Phase 0, joint.
  Do not edit after Phase 0 without both tracks agreeing:
  Track A styles its own UI in score.css, Track B in sms-sender.css,
  both consuming the tokens declared here.

  Concept: an instrument reading a signal for anomalies, not a
  "hacker terminal." Deep ink-navy, hairline instrument-panel borders,
  a three-stop signal ramp reserved for the actual risk reading.
*/

:root {
  --ink: #0b1220;
  --panel: #121a2b;
  --panel-border: #22304a;
  --fg: #e7ebf3;
  --muted: #8b95ac;
  --signal: #4fd1c5;
  --signal-dim: #2c5450;

  --font-sans: "IBM Plex Sans", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.75rem;
  --space-4: 2.75rem;
  --radius: 6px;
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: dark;
}

body {
  margin: 0;
  padding: 0;
  background: var(--ink);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
}

.wrap {
  max-width: 42rem;
  margin: 0 auto;
  padding-inline: var(--space-2);
}

a {
  color: var(--signal);
}

:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

/* --- header --- */

.site-head {
  padding-block: var(--space-4) var(--space-3);
}

.mark {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin: 0;
  font-size: 1.375rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.mark-glyph {
  width: 28px;
  height: 14px;
  flex: none;
}

.mark-glyph polyline {
  fill: none;
  stroke: var(--signal);
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.tagline {
  margin: var(--space-1) 0 0;
  max-width: 34rem;
  color: var(--muted);
  font-size: 1rem;
}

/* --- panels (shared frame; Track A/B style their own contents) --- */

main.wrap {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding-bottom: var(--space-4);
}

.panel {
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  background: var(--panel);
  padding: var(--space-3);
}

.panel h2 {
  margin: 0 0 var(--space-1);
  font-size: 1.0625rem;
  font-weight: 600;
}

.panel-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.875rem;
}

/* shared textarea baseline; Track A may extend further in score.css */
#sms-text {
  width: 100%;
  min-height: 7rem;
  margin-top: var(--space-2);
  padding: var(--space-1);
  background: var(--ink);
  color: var(--fg);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  resize: vertical;
}

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

.how {
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: var(--space-2) var(--space-3);
}

.how summary {
  cursor: pointer;
  font-weight: 500;
}

.how-body {
  margin-top: var(--space-2);
  color: var(--muted);
  font-size: 0.9375rem;
}

.how-body p {
  margin: 0 0 var(--space-1);
}

.how-body p:last-child {
  margin-bottom: 0;
}

@media (max-width: 30rem) {
  .site-head {
    padding-block: var(--space-3) var(--space-2);
  }
  .panel {
    padding: var(--space-2);
  }
}