/* ============================================================
   RepSetStat — Phase 0 landing page
   Dark industrial register: one amber accent, numeric mono.
   All colors in OKLCH.
   ============================================================ */

:root {
  /* Surfaces: near-black, tinted toward blue steel */
  --bg:        oklch(0.16 0.012 265);
  --surface:   oklch(0.19 0.014 265);
  --surface-2: oklch(0.23 0.016 265);
  --field:     oklch(0.215 0.015 265);

  /* Accent: gauge amber */
  --accent:       oklch(0.75 0.15 70);
  --accent-bright: oklch(0.82 0.15 75);
  --accent-dim:   oklch(0.55 0.10 70);

  /* Ink */
  --ink:         oklch(0.92 0.008 265);
  --ink-muted:   oklch(0.72 0.012 265);
  --ink-faint:   oklch(0.55 0.014 265);
  --line:        oklch(0.30 0.018 265);
  --line-strong: oklch(0.38 0.02 265);

  /* Semantic */
  --ok:        oklch(0.75 0.13 155);
  --danger:    oklch(0.68 0.17 25);

  /* Type */
  --font-display: "Barlow Condensed", "Arial Narrow", sans-serif;
  --font-body: "Barlow", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;

  /* Rhythm — tightened from reference site's generous scale */
  --space-1: 0.375rem;
  --space-2: 0.75rem;
  --space-3: 1.25rem;
  --space-4: 2rem;
  --space-5: 3.5rem;
  --space-6: 5.5rem;

  --radius: 10px;
  --radius-sm: 6px;

  /* Z-index scale */
  --z-header: 100;
  --measure: 68rem;
}

/* ---------- Reset-ish ---------- */

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img,
svg {
  display: block;
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.04;
  letter-spacing: -0.02em;
  text-wrap: balance;
  margin: 0 0 var(--space-3);
}

p {
  margin: 0 0 var(--space-3);
  text-wrap: pretty;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  color: var(--accent-bright);
}

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

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

.mono {
  font-family: var(--font-mono);
}

.container {
  width: min(68rem, 100% - 2.5rem);
  margin-inline: auto;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: var(--space-2);
  top: -100%;
  z-index: var(--z-header);
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: var(--bg);
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.skip-link:focus {
  top: var(--space-2);
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.5rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font: 600 1rem/1 var(--font-body);
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: background-color 160ms ease-out, color 160ms ease-out, border-color 160ms ease-out;
}

.btn-primary {
  background: var(--accent);
  color: oklch(0.16 0.03 70);
}

.btn-primary:hover {
  background: var(--accent-bright);
  color: oklch(0.16 0.03 70);
}

.btn-primary:disabled {
  background: var(--accent-dim);
  cursor: wait;
}

.btn-secondary {
  background: transparent;
  border-color: var(--line-strong);
  color: var(--ink);
}

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

.btn-sm {
  padding: 0.55rem 1rem;
  font-size: 0.9375rem;
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: color-mix(in oklab, var(--bg) 88%, transparent);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.header-row {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding-block: 0.9rem;
}

.wordmark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.wordmark:hover {
  color: var(--ink);
}

.wordmark-sm {
  font-size: 1.1rem;
}

.site-nav {
  display: flex;
  gap: var(--space-3);
  margin-left: auto;
}

.site-nav a {
  color: var(--ink-muted);
  font-size: 0.9375rem;
  font-weight: 500;
}

.site-nav a:hover {
  color: var(--ink);
}

.header-cta {
  margin-left: var(--space-2);
}

/* ---------- Hero ---------- */

.hero {
  padding-block: var(--space-6) var(--space-5);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: var(--space-5);
  align-items: center;
}

.hero-tag {
  color: var(--accent);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: var(--space-2);
}

.hero h1 {
  font-size: clamp(2.75rem, 6vw, 4.75rem);
  margin-bottom: var(--space-3);
}

.hero-sub {
  font-size: 1.1875rem;
  color: var(--ink-muted);
  max-width: 34rem;
  margin-bottom: var(--space-2);
}

/* The line that connects the engine headline to the store CTA. Quieter than the sub so the
   hierarchy reads: claim, then the paper option, then the buttons. */
.hero-bridge {
  font-size: 1rem;
  color: var(--ink-muted);
  max-width: 34rem;
  margin-bottom: var(--space-4);
}

/* ---------- Hero actions ---------- */

.hero-actions {
  max-width: 32rem;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* The closing section's CTA row, matching the hero's. */
.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: center;
}

.fine-print {
  margin-top: var(--space-2);
  font-size: 0.875rem;
  color: var(--ink-faint);
}

/* ---------- Engine panel (hero demo) ---------- */

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

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.chip {
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  border-radius: 999px;
  padding: 0.2rem 0.6rem;
}

.panel-title {
  font-size: 0.9375rem;
  color: var(--ink-muted);
}

.exercise-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--line);
}

.ex-name {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0;
}

.ex-rx {
  margin: 0.15rem 0 0;
  font-size: 0.8125rem;
  color: var(--ink-muted);
}

.ex-week {
  font-size: 0.8125rem;
  color: var(--ink-faint);
  white-space: nowrap;
}

.set-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.set-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding-block: 0.7rem;
  border-bottom: 1px solid var(--line);
  font-size: 0.9375rem;
}

.set-check {
  display: grid;
  place-items: center;
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 50%;
  background: var(--accent);
  color: oklch(0.16 0.03 70);
  flex-shrink: 0;
}

.set-name {
  font-weight: 600;
}

.set-detail {
  margin-left: auto;
  color: var(--ink-muted);
  font-size: 0.875rem;
}

.badge {
  font-size: 0.75rem;
  color: var(--ink-muted);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 0.15rem 0.5rem;
  white-space: nowrap;
}

.engine-line {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding-top: var(--space-3);
  min-height: 3.2rem;
}

.engine-label {
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  flex-shrink: 0;
}

.engine-out {
  margin: 0;
  font-size: 0.875rem;
  color: var(--ink-muted);
}

.engine-out .when-final {
  color: var(--ink);
  font-weight: 500;
}

/* ---------- Logging section ---------- */

.logging {
  padding-block: var(--space-6);
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.log-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: var(--space-5);
  align-items: center;
}

.logging h2,
.faq h2,
.cta h2,
.hardware h2 {
  font-size: clamp(2rem, 4vw, 3rem);
}

.log-copy > p {
  color: var(--ink-muted);
  max-width: 36rem;
}

.point-list {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.point-list li {
  display: flex;
  gap: 0.875rem;
  align-items: flex-start;
  max-width: 36rem;
}

.point-icon {
  display: grid;
  place-items: center;
  width: 2.4rem;
  height: 2.4rem;
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  border: 1px solid var(--line);
  color: var(--accent);
  flex-shrink: 0;
}

.point-list li > span:last-child {
  padding-top: 0.2rem;
}

/* ---------- Phone mock ---------- */

.phone-wrap {
  display: grid;
  justify-items: center;
}

.phone {
  width: min(20rem, 100%);
  background: oklch(0.13 0.012 265);
  border: 1px solid var(--line-strong);
  border-radius: 26px;
  padding: 0.6rem;
  box-shadow: 0 8px 24px oklch(0 0 0 / 0.35);
}

.phone-screen {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 21px;
  padding: 1.1rem 1rem 1.2rem;
  display: grid;
  gap: 0.9rem;
}

.phone-topline {
  margin: 0;
  font-size: 0.6875rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.phone-ex-name {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 700;
  margin: 0;
}

.phone-ex-rx {
  margin: 0.1rem 0 0;
  font-size: 0.75rem;
  color: var(--ink-muted);
}

.phone-sets {
  display: grid;
  gap: 0.45rem;
}

.phone-set {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.8125rem;
  color: var(--ink-muted);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.6rem;
}

.phone-set.done .badge {
  margin-left: auto;
}

.phone-set-check {
  display: grid;
  place-items: center;
  width: 1.05rem;
  height: 1.05rem;
  border-radius: 50%;
  background: var(--accent);
  color: oklch(0.16 0.03 70);
  flex-shrink: 0;
}

.phone-set.current {
  border-style: dashed;
  border-color: var(--line-strong);
  color: var(--ink);
  justify-content: center;
}

.phone-stepper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
}

.step-btn {
  display: grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  border: 1px solid var(--line-strong);
  font-size: 1.4rem;
  color: var(--ink);
}

.step-load {
  font-size: 1.25rem;
  font-weight: 500;
}

.phone-rest {
  display: grid;
  gap: 0.4rem;
}

.phone-rest-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.phone-rest-label {
  font-size: 0.6875rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.phone-rest-time {
  font-size: 1.35rem;
  color: var(--accent);
}

.phone-rest-track {
  height: 0.4rem;
  border-radius: 999px;
  background: var(--surface-2);
  overflow: hidden;
}

.phone-rest-fill {
  width: 58%;
  height: 100%;
  background: var(--accent);
  border-radius: 999px;
}

.phone-cta {
  display: grid;
  place-items: center;
  padding: 1rem;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: oklch(0.16 0.03 70);
  font-weight: 600;
  font-size: 1.05rem;
}

/* ---------- Hardware ---------- */

.hardware {
  padding-block: var(--space-6);
  border-top: 1px solid var(--line);
}

.hw-inner {
  max-width: 44rem;
}

.hw-inner > p {
  color: var(--ink-muted);
  max-width: 40rem;
}

.hw-note {
  font-size: 0.8125rem;
  color: var(--accent);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-top: var(--space-3);
}

.hw-tip {
  margin-top: var(--space-2);
  font-size: 0.9375rem;
  color: var(--ink-faint);
}

/* ---------- FAQ ---------- */

.faq {
  padding-block: var(--space-6);
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.faq-inner {
  max-width: 46rem;
}

.faq-list {
  margin-top: var(--space-4);
  display: grid;
  gap: 0.75rem;
}

.faq-list details {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg);
  padding: 0;
}

.faq-list summary {
  cursor: pointer;
  padding: 1rem 1.25rem;
  font-weight: 600;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-2);
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary::after {
  content: "+";
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 1.25rem;
  line-height: 1;
  flex-shrink: 0;
}

.faq-list details[open] summary::after {
  content: "−";
}

.faq-list details p {
  padding: 0 1.25rem 1.1rem;
  margin: 0;
  color: var(--ink-muted);
  max-width: 60ch;
}

/* ---------- CTA ---------- */

.cta {
  padding-block: var(--space-6);
  text-align: center;
}

.cta-inner {
  max-width: 36rem;
}

.cta p {
  color: var(--ink-muted);
}

/* ---------- Features (benefit cards) ---------- */

.features {
  padding-block: var(--space-6);
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.features-inner {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 var(--space-2);
}

.features h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  text-align: center;
  margin-bottom: var(--space-5);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}

.feature-card {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: var(--space-4);
  text-align: center;
  transition: border-color 200ms ease-out, transform 200ms ease-out;
}

.feature-card:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

@media (prefers-reduced-motion: reduce) {
  .feature-card {
    transition: none;
  }
}

.feature-icon {
  display: inline-grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  border: 1px solid var(--line);
  color: var(--accent);
  margin-bottom: var(--space-2);
}

.feature-card h3 {
  font-size: 1.125rem;
  margin-bottom: var(--space-1);
}

.feature-card p {
  color: var(--ink-muted);
  font-size: 0.9375rem;
  margin: 0;
}

@media (max-width: 56rem) {
  .features-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- Promo banner strip ---------- */

.promo-strip {
  background: color-mix(in oklab, var(--accent) 12%, transparent);
  border-top: 1px solid color-mix(in oklab, var(--accent) 30%, transparent);
  border-bottom: 1px solid color-mix(in oklab, var(--accent) 30%, transparent);
  padding-block: var(--space-4);
}

.promo-inner {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 var(--space-2);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.promo-copy {
  flex: 1;
  min-width: 20rem;
}

.promo-copy h2 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  margin: 0 0 var(--space-1);
}

.promo-copy p {
  color: var(--ink-muted);
  margin: 0;
}

.promo-cta {
  flex-shrink: 0;
}

/* ---------- Footer (expanded) ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  padding-block: var(--space-5) var(--space-3);
  background: var(--surface);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}

.footer-brand {
  max-width: 22rem;
}

.footer-brand .wordmark {
  margin-bottom: var(--space-2);
}

.footer-brand p {
  color: var(--ink-muted);
  font-size: 0.9375rem;
  margin: 0;
}

.footer-col h3 {
  font-size: 0.875rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: var(--space-3);
}

.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: var(--space-1);
}

.footer-col a {
  color: var(--ink-muted);
  font-size: 0.9375rem;
  transition: color 160ms ease-out;
}

.footer-col a:hover {
  color: var(--ink);
}

.footer-social {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.footer-social a {
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-sm);
  background: var(--bg);
  border: 1px solid var(--line);
  color: var(--ink-muted);
  transition: border-color 160ms ease-out, color 160ms ease-out;
}

.footer-social a:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.footer-bottom {
  border-top: 1px solid var(--line);
  padding-top: var(--space-3);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.footer-note {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--ink-faint);
}

.footer-copy {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--ink-faint);
}

@media (max-width: 56rem) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .footer-brand {
    grid-column: span 2;
  }
}

@media (max-width: 30rem) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-brand {
    grid-column: span 1;
  }
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ---------- Motion ---------- */

/* Reveals are enhancement-only. The hidden state is gated on scripting, and
   the 3s safety net fades in anything Datastar never intersected, so content
   can never stay invisible if the runtime fails to load. */
@media (scripting: enabled) {
  [data-reveal] {
    opacity: 0;
    transform: translateY(14px);
    transition: opacity 480ms ease-out, transform 480ms ease-out;
    animation: reveal-net 480ms ease-out 3s forwards;
  }

  [data-reveal].is-visible {
    opacity: 1;
    transform: none;
  }
}

/* `to`-only keyframe: animates from whatever the element currently is, so it is
   a no-op for elements Datastar already revealed. */
@keyframes reveal-net {
  to {
    opacity: 1;
    transform: none;
  }
}

/* Engine loop: default state shows final values */
.engine-panel[data-loop] .set-detail,
.engine-panel[data-loop] .badge {
  opacity: 1;
  transition: opacity 300ms ease-out;
}

.engine-panel[data-loop] .set-check {
  opacity: 1;
  transition: opacity 300ms ease-out;
}

.engine-panel[data-loop].is-idle .set-detail,
.engine-panel[data-loop].is-idle .badge,
.engine-panel[data-loop].is-idle .set-check {
  opacity: 0;
}

.engine-panel[data-loop] .when-final {
  display: inline;
}

.engine-panel[data-loop] .when-computing {
  display: none;
}

.engine-panel[data-loop].is-computing .when-final {
  display: none;
}

.engine-panel[data-loop].is-computing .when-computing {
  display: inline;
  color: var(--ink-faint);
}

.engine-panel[data-loop].is-computing .engine-out {
  animation: pulse 1.1s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.55; }
}

@media (prefers-reduced-motion: reduce) {
  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
    animation: none;
  }

  /* The engine loop still ticks, but the panel is pinned to the completed
     state, which is what the old script did by bailing out early. */
  .engine-panel[data-loop].is-idle .set-check,
  .engine-panel[data-loop].is-idle .set-detail,
  .engine-panel[data-loop].is-idle .badge {
    opacity: 1;
  }

  .engine-panel[data-loop].is-computing .when-computing {
    display: none;
  }

  .engine-panel[data-loop].is-computing .when-final {
    display: inline;
  }

  .engine-panel[data-loop].is-computing .engine-out {
    animation: none;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}

/* ---------- Responsive ---------- */

@media (max-width: 56rem) {
  .hero {
    padding-block: var(--space-5);
  }

  .hero-grid,
  .log-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .hero-demo {
    max-width: 30rem;
  }

  .site-nav {
    display: none;
  }

  .header-cta {
    margin-left: auto;
  }
}

@media (max-width: 30rem) {
  body {
    font-size: 1rem;
  }

  .header-cta {
    display: none;
  }

  .footer-row {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-1);
  }

  .footer-copy {
    margin-left: 0;
  }
}