/* PulseFrog landing — design spec #6 tokens, editorial execution.
   Display: Fraunces (variable, self-hosted). Body: Inter. Dial layer: mono. */

@font-face {
  font-family: "Fraunces";
  src: url("fonts/fraunces.woff2") format("woff2");
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Inter";
  src: url("fonts/inter.woff2") format("woff2");
  font-weight: 400 600;
  font-style: normal;
  font-display: swap;
}

:root {
  /* spec §3.1 — dark is the flagship mood */
  --surface0: #0c0f0d;
  --surface1: #141816;
  --surface2: #1d2320;
  --pulse: #7ed957;
  --pulse-soft: rgba(126, 217, 87, 0.14);
  --text-hi: #f2f4f1;
  --text-mid: #a8b0a9;
  --text-lo: #6a716b;
  --danger: #e5484d;
  --hairline: rgba(168, 176, 169, 0.16);

  --display: "Fraunces", "Iowan Old Style", Georgia, serif;
  --body: "Inter", -apple-system, "Segoe UI", sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, monospace;

  --gutter: clamp(1.25rem, 5vw, 4rem);
  --col: min(64rem, 100% - 2 * var(--gutter));

  color-scheme: dark light;
}

@media (prefers-color-scheme: light) {
  :root {
    --surface0: #fafaf7;
    --surface1: #ffffff;
    --surface2: #f1f2ee;
    --pulse: #3f9b3f;
    --pulse-soft: rgba(63, 155, 63, 0.1);
    --text-hi: #171a17;
    --text-mid: #5b615b;
    --text-lo: #8b918b;
    --hairline: rgba(23, 26, 23, 0.12);
  }
}

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

body {
  background: var(--surface0);
  color: var(--text-mid);
  font-family: var(--body);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--display);
  color: var(--text-hi);
  font-weight: 560;
  line-height: 1.06;
  letter-spacing: -0.015em;
  text-wrap: balance;
}

.measure { width: var(--col); margin-inline: auto; }

.eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-lo);
  margin-bottom: 1.1rem;
}

/* ── masthead ─────────────────────────────────────────────── */

.masthead {
  width: var(--col);
  margin-inline: auto;
  padding-block: 1.4rem;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.wordmark {
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--text-hi);
  letter-spacing: -0.01em;
}

.onair {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--text-lo);
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  white-space: nowrap;
}

.onair-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--pulse);
  animation: beacon 2.4s ease-in-out infinite;
}
@keyframes beacon { 0%, 100% { opacity: 1; } 50% { opacity: 0.25; } }
@media (prefers-reduced-motion: reduce) { .onair-dot { animation: none; } }

/* ── hero ─────────────────────────────────────────────────── */

.hero { padding-top: clamp(3.5rem, 10vh, 7rem); }

.hero h1 {
  font-size: clamp(3rem, 8.5vw, 6rem);
  max-width: 12ch;
}

.hero .sub {
  margin-top: 1.6rem;
  max-width: 44ch;
  font-size: clamp(1.1rem, 1.6vw, 1.25rem);
  line-height: 1.6;
}

/* the thesis: the Pulse runs edge to edge under the headline */
.horizon {
  margin-top: clamp(2.5rem, 7vh, 5rem);
  border-block: 1px solid var(--hairline);
  padding-block: 1.25rem;
}
.horizon .pulse-canvas { display: block; width: 100%; height: clamp(90px, 14vh, 150px); }

/* ── sections ─────────────────────────────────────────────── */

section { padding-block: clamp(3.5rem, 9vh, 6.5rem); }
.hero { padding-bottom: 0; }

h2 { font-size: clamp(2rem, 4.5vw, 3rem); }

.section-lede {
  margin-top: 1.1rem;
  max-width: 52ch;
}

/* ── the tuner (demo player) ──────────────────────────────── */

.tuner {
  width: var(--col);
  margin: 2.75rem auto 0;
  background: var(--surface1);
  border: 1px solid var(--hairline);
  border-radius: 14px;
  padding: 1.25rem 1.5rem 1.5rem;
}

.tuner-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--hairline);
  margin-bottom: 1.25rem;
}

.tuner-label, .player-time {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--text-lo);
  font-variant-numeric: tabular-nums;
}

.tuner-body { display: flex; align-items: center; gap: 1.4rem; }

.play-btn {
  flex: none;
  width: 3.4rem; height: 3.4rem;
  border-radius: 50%;
  border: none;
  background: var(--pulse);
  color: var(--surface0);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: transform 120ms ease-out, opacity 120ms ease-out;
}
.play-btn:hover:not(:disabled) { transform: scale(1.06); }
.play-btn:active:not(:disabled) { transform: scale(0.97); }
.play-btn:focus-visible { outline: 2px solid var(--pulse); outline-offset: 3px; }
.play-btn:disabled { opacity: 0.35; cursor: default; }
.play-btn svg { width: 1.4rem; height: 1.4rem; fill: currentColor; }
.play-btn .icon-pause { display: none; }
#player.playing .icon-play { display: none; }
#player.playing .icon-pause { display: block; }

.player-wave { flex: 1; min-width: 0; }
.pulse-canvas--player { display: block; width: 100%; height: 64px; }

.player-progress {
  margin-top: 0.9rem;
  height: 2px;
  background: var(--surface2);
  border-radius: 1px;
  overflow: hidden;
}
.player-progress-fill {
  height: 100%;
  width: 0%;
  background: var(--pulse);
  transition: width 200ms linear;
}

#player.unavailable .player-wave { opacity: 0.35; }
.demo-missing {
  margin-top: 1rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-lo);
}

/* ── benefits: a ruled band, not cards ───────────────────── */

.benefits {
  width: var(--col);
  margin-inline: auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  border-top: 1px solid var(--hairline);
}

.benefit h3 { font-size: 1.45rem; margin-bottom: 0.6rem; }
.benefit .eyebrow { margin-bottom: 0.9rem; color: var(--pulse); }
.benefit p:not(.eyebrow) { max-width: 30ch; }

@media (max-width: 40rem) {
  .benefits { grid-template-columns: 1fr; gap: 2.25rem; }
  .tuner-body { gap: 1rem; }
}

/* ── waitlist ─────────────────────────────────────────────── */

.waitlist { border-top: 1px solid var(--hairline); }

.waitlist h2 { max-width: 16ch; }

#waitlist-form {
  margin-top: 2.2rem;
  display: flex;
  gap: 0.8rem;
  max-width: 34rem;
  flex-wrap: wrap;
}

#email {
  flex: 1;
  min-width: 14rem;
  font: inherit;
  color: var(--text-hi);
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--text-lo);
  border-radius: 0;
  padding: 0.65rem 0.1rem;
  transition: border-color 120ms ease-out;
}
#email::placeholder { color: var(--text-lo); }
#email:focus { outline: none; border-bottom-color: var(--pulse); }
#email[aria-invalid="true"] { border-bottom-color: var(--danger); }

#waitlist-form button {
  font-family: var(--body);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--surface0);
  background: var(--pulse);
  border: none;
  border-radius: 999px;
  padding: 0.7rem 1.6rem;
  cursor: pointer;
  transition: transform 120ms ease-out, opacity 120ms ease-out;
}
#waitlist-form button:hover:not(:disabled) { transform: translateY(-1px); }
#waitlist-form button:focus-visible { outline: 2px solid var(--pulse); outline-offset: 3px; }
#waitlist-form button:disabled { opacity: 0.5; cursor: default; }

.waitlist-status { margin-top: 1rem; min-height: 1.5em; font-size: 0.95rem; }
.waitlist-status.ok { color: var(--pulse); }
.waitlist-status.err { color: var(--danger); }
.waitlist-status a { color: var(--text-hi); }

/* ── footer ───────────────────────────────────────────────── */

footer {
  width: var(--col);
  margin-inline: auto;
  padding-block: 2.5rem;
  border-top: 1px solid var(--hairline);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2.5rem;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--text-lo);
}
footer a { color: var(--text-lo); text-decoration-color: var(--hairline); }
footer a:hover { color: var(--text-hi); }

/* ── a11y ─────────────────────────────────────────────────── */

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  clip-path: inset(50%);
  overflow: hidden;
  white-space: nowrap;
}

/* ── preference chips (spec §5a G5) ──────────────────────── */

.chip-rows {
  margin-top: 1.8rem;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}
.chip-row { display: flex; flex-wrap: wrap; gap: 0.6rem; }

.chip {
  font-family: var(--body);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-mid);
  background: transparent;
  border: 1px solid var(--hairline);
  border-radius: 999px;
  padding: 0.45rem 1.05rem;
  cursor: pointer;
  transition: border-color 120ms ease-out, color 120ms ease-out, background 120ms ease-out;
}
.chip:hover { border-color: var(--text-lo); color: var(--text-hi); }
.chip:focus-visible { outline: 2px solid var(--pulse); outline-offset: 2px; }
.chip.selected {
  background: var(--pulse-soft);
  border-color: var(--pulse);
  color: var(--text-hi);
}

/* ── price line (spec §5a G7) ────────────────────────────── */

.price { margin-top: 1.4rem; color: var(--text-mid); }
.price strong {
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.6rem;
  color: var(--text-hi);
  letter-spacing: -0.01em;
}
.price-per { color: var(--text-mid); }
.price-note {
  display: block;
  margin-top: 0.3rem;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-lo);
}