/* ==========================================================================
   Octave Tuner — website design system
   Tokens mirror OctaveTuner/Resources/Assets.xcassets/Colors and DESIGN.md
   ========================================================================== */

:root {
  /* Palette — dark is the default target, matching the app */
  --background: #0a0a0a;
  --background-secondary: #1c1c1e;
  --background-elevated: #252528;
  --text-primary: #ffffff;
  --text-secondary: #8e8e93;
  --separator: #38383a;
  --accent: #00bfa6;
  --accent-strong: #00d9bd;
  --flat: #ffb020;
  --in-tune: #34c759;
  --sharp: #5e5ce6;
  --destructive: #ff453a;

  /* 8pt spacing grid */
  --space-xs: 4px;
  --space-s: 8px;
  --space-m: 16px;
  --space-l: 24px;
  --space-xl: 32px;
  --space-xxl: 48px;
  --space-section: 96px;

  --radius-s: 8px;
  --radius-m: 14px;
  --radius-l: 22px;

  --font-rounded: ui-rounded, "SF Pro Rounded", -apple-system, BlinkMacSystemFont,
    "Segoe UI", system-ui, sans-serif;
  --font-text: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI",
    system-ui, sans-serif;
  --font-mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, monospace;

  --content-width: 1120px;
  --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.4), 0 12px 32px rgba(0, 0, 0, 0.32);
}

@media (prefers-color-scheme: light) {
  :root {
    --background: #f5f5f5;
    --background-secondary: #ffffff;
    --background-elevated: #ffffff;
    --text-primary: #000000;
    --text-secondary: #6c6c70;
    --separator: #c6c6c8;
    --accent: #00897b;
    --accent-strong: #00695f;
    --destructive: #ff3b30;
    --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.06), 0 12px 32px rgba(0, 0, 0, 0.08);
  }
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text-primary);
  font-family: var(--font-text);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-rounded);
  font-weight: 700;
  letter-spacing: -0.022em;
  line-height: 1.1;
  margin: 0;
  text-wrap: balance;
}

p {
  margin: 0;
  text-wrap: pretty;
}

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

a:hover {
  text-decoration: underline;
}

img,
svg {
  max-width: 100%;
  display: block;
}

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: var(--space-s) var(--space-m);
  z-index: 100;
  border-radius: 0 0 var(--radius-s) 0;
}

.skip-link:focus {
  left: 0;
}

.wrap {
  width: 100%;
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: var(--space-l);
}

.section {
  padding-block: var(--space-section);
  border-top: 1px solid var(--separator);
}

.section-narrow {
  max-width: 760px;
  margin-inline: auto;
}

.eyebrow {
  font-family: var(--font-rounded);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-m);
}

.section-title {
  font-size: clamp(30px, 4vw, 42px);
  margin-bottom: var(--space-m);
}

.section-lead {
  color: var(--text-secondary);
  font-size: 19px;
  max-width: 62ch;
}

.section-head {
  margin-bottom: var(--space-xxl);
}

/* ------------------------------------------------------------------ nav */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--background) 82%, transparent);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--separator);
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: var(--space-l);
  min-height: 60px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-rounded);
  font-weight: 700;
  font-size: 17px;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.brand:hover {
  text-decoration: none;
}

.brand img {
  width: 28px;
  height: 28px;
  border-radius: 7px;
}

.nav-links {
  display: flex;
  gap: var(--space-l);
  margin-left: auto;
  align-items: center;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 15px;
  font-weight: 500;
}

.nav-links a:hover {
  color: var(--text-primary);
  text-decoration: none;
}

/* The nav CTA is a button first — keep it out of the muted link styling. */
.nav-links a.btn-primary,
.nav-links a.btn-primary:hover {
  color: #fff;
}

@media (max-width: 720px) {
  .nav-links .nav-hide-sm {
    display: none;
  }
}

/* Keep the nav on one line on small phones. */
@media (max-width: 460px) {
  .nav-inner {
    gap: var(--space-m);
  }

  .brand {
    font-size: 15px;
    white-space: nowrap;
  }

  .nav-links {
    gap: var(--space-m);
  }

  .nav-links .btn-sm {
    padding: 0 12px;
    font-size: 14px;
  }
}

/* --------------------------------------------------------------- buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-s);
  min-height: 52px;
  padding: 0 var(--space-l);
  border-radius: var(--radius-m);
  font-family: var(--font-rounded);
  font-size: 17px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background-color 0.15s ease,
    border-color 0.15s ease;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

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

.btn-primary:hover {
  background: var(--accent-strong);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--separator);
}

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

.btn-sm {
  min-height: 40px;
  font-size: 15px;
  padding: 0 var(--space-m);
  border-radius: 10px;
}

.btn-appstore {
  padding-left: var(--space-m);
}

.btn-appstore svg {
  width: 22px;
  height: 22px;
  flex: none;
}

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

.hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(56px, 9vw, 104px) var(--space-section);
}

.hero::before {
  content: "";
  position: absolute;
  inset: -30% 0 auto 50%;
  translate: -50% 0;
  width: min(900px, 130%);
  aspect-ratio: 1;
  background: radial-gradient(
    circle,
    color-mix(in srgb, var(--accent) 20%, transparent) 0%,
    transparent 62%
  );
  pointer-events: none;
  z-index: 0;
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
}

@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-copy .badge-row,
  .hero-copy .cta-row,
  .hero-copy .trust-row {
    justify-content: center;
  }

  .hero-copy .section-lead {
    margin-inline: auto;
  }
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-s);
  margin-bottom: var(--space-l);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--background-secondary);
  border: 1px solid var(--separator);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  font-family: var(--font-rounded);
}

.badge-accent {
  color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 40%, transparent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
}

.hero h1 {
  font-size: clamp(40px, 6.2vw, 68px);
  margin-bottom: var(--space-l);
}

.hero h1 .grad {
  background: linear-gradient(100deg, var(--accent) 0%, var(--in-tune) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  white-space: nowrap;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-m);
  margin-top: var(--space-xl);
}

.trust-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-m) var(--space-l);
  margin-top: var(--space-l);
  color: var(--text-secondary);
  font-size: 14px;
}

.trust-row span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.check {
  color: var(--in-tune);
  font-weight: 700;
}

/* --------------------------------------------------------- phone frame */
/* Frame only — the image inside is a real screenshot of the shipping app. */

.phone {
  width: min(320px, 100%);
  margin-inline: auto;
  background: #0a0a0a;
  border: 10px solid #1f1f22;
  border-radius: 52px;
  box-shadow: 0 40px 80px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.06);
  overflow: hidden;
  line-height: 0;
}

.phone img {
  width: 100%;
  height: auto;
  border-radius: 42px;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

/* ---------------------------------------------------------------- cards */

.grid {
  display: grid;
  gap: var(--space-m);
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

@media (max-width: 880px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 620px) {
  .grid-3,
  .grid-2 {
    grid-template-columns: 1fr;
  }
}

.card {
  background: var(--background-secondary);
  border: 1px solid var(--separator);
  border-radius: var(--radius-m);
  padding: var(--space-l);
}

.card h3 {
  font-size: 19px;
  margin-bottom: var(--space-s);
}

.card p {
  color: var(--text-secondary);
  font-size: 15px;
}

.card-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: color-mix(in srgb, var(--accent) 15%, transparent);
  color: var(--accent);
  margin-bottom: var(--space-m);
}

.card-icon svg {
  width: 21px;
  height: 21px;
}

/* stat row */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-m);
}

@media (max-width: 780px) {
  .stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

.stat {
  text-align: center;
  padding: var(--space-l) var(--space-m);
  background: var(--background-secondary);
  border: 1px solid var(--separator);
  border-radius: var(--radius-m);
}

.stat dt {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 34px);
  font-weight: 600;
  color: var(--accent);
  letter-spacing: -0.02em;
}

.stat dd {
  margin: var(--space-xs) 0 0;
  font-size: 14px;
  color: var(--text-secondary);
}

/* steps */
.steps {
  counter-reset: step;
  display: grid;
  gap: var(--space-l);
  grid-template-columns: repeat(3, 1fr);
}

@media (max-width: 780px) {
  .steps {
    grid-template-columns: 1fr;
  }
}

.step {
  position: relative;
  padding-top: var(--space-xxl);
}

.step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  top: 0;
  left: 0;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
}

.step h3 {
  font-size: 19px;
  margin-bottom: var(--space-s);
}

.step p {
  color: var(--text-secondary);
  font-size: 15px;
}

/* -------------------------------------------------------- pricing table */

.plans {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-m);
  align-items: start;
}

@media (max-width: 780px) {
  .plans {
    grid-template-columns: 1fr;
  }
}

.plan {
  background: var(--background-secondary);
  border: 1px solid var(--separator);
  border-radius: var(--radius-l);
  padding: var(--space-xl);
}

.plan-pro {
  border-color: color-mix(in srgb, var(--accent) 50%, transparent);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent) 20%, transparent),
    var(--shadow-card);
  position: relative;
}

.plan-tag {
  position: absolute;
  top: var(--space-l);
  right: var(--space-l);
  font-size: 12px;
  font-weight: 700;
  font-family: var(--font-rounded);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
}

.plan h3 {
  font-size: 22px;
}

.plan-price {
  font-family: var(--font-rounded);
  font-size: 44px;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-block: var(--space-s) var(--space-xs);
}

.plan-note {
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: var(--space-l);
}

.plan ul {
  list-style: none;
  margin: 0 0 var(--space-l);
  padding: 0;
  display: grid;
  gap: 10px;
}

/* Block layout (not flex) so bold labels and trailing text stay on one
   inline run and wrap together instead of becoming separate flex items. */
.plan li {
  display: block;
  position: relative;
  padding-left: 26px;
  font-size: 15px;
  color: var(--text-secondary);
}

.plan li b {
  color: var(--text-primary);
  font-weight: 600;
}

.plan li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--in-tune);
  font-weight: 700;
}

/* --------------------------------------------------------------- tunings */

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-s);
}

.chip {
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--separator);
  background: var(--background-secondary);
  font-size: 14px;
  font-family: var(--font-rounded);
  font-weight: 500;
  color: var(--text-secondary);
}

.chip-free {
  color: var(--in-tune);
  border-color: color-mix(in srgb, var(--in-tune) 40%, transparent);
}

/* ------------------------------------------------------------------ faq */

.faq-list {
  display: grid;
  gap: var(--space-s);
}

.faq-item {
  background: var(--background-secondary);
  border: 1px solid var(--separator);
  border-radius: var(--radius-m);
  padding: var(--space-l);
}

.faq-item h3 {
  font-size: 18px;
  margin-bottom: var(--space-s);
}

.faq-item p {
  color: var(--text-secondary);
  font-size: 16px;
}

.faq-item p + p {
  margin-top: var(--space-s);
}

details.faq-item > summary {
  cursor: pointer;
  font-family: var(--font-rounded);
  font-weight: 600;
  font-size: 18px;
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: var(--space-m);
  align-items: center;
}

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

details.faq-item > summary::after {
  content: "+";
  color: var(--accent);
  font-size: 24px;
  font-weight: 400;
  line-height: 1;
  flex: none;
}

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

details.faq-item > div {
  padding-top: var(--space-m);
  color: var(--text-secondary);
}

/* ------------------------------------------------------------- final cta */

.cta-panel {
  background: linear-gradient(
    160deg,
    color-mix(in srgb, var(--accent) 16%, var(--background-secondary)) 0%,
    var(--background-secondary) 60%
  );
  border: 1px solid color-mix(in srgb, var(--accent) 34%, transparent);
  border-radius: var(--radius-l);
  padding: clamp(32px, 6vw, 64px);
  text-align: center;
}

.cta-panel h2 {
  font-size: clamp(28px, 4vw, 40px);
  margin-bottom: var(--space-m);
}

.cta-panel p {
  color: var(--text-secondary);
  max-width: 52ch;
  margin-inline: auto;
  font-size: 18px;
}

.cta-panel .cta-row {
  justify-content: center;
}

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

.footer {
  border-top: 1px solid var(--separator);
  padding-block: var(--space-xxl);
  color: var(--text-secondary);
  font-size: 14px;
}

.footer-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-l);
  justify-content: space-between;
  align-items: center;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-l);
}

.footer-links a {
  color: var(--text-secondary);
}

.footer-links a:hover {
  color: var(--text-primary);
}

/* ------------------------------------------------------------ doc pages */

.doc {
  padding-block: var(--space-xxl) var(--space-section);
}

.doc-header {
  margin-bottom: var(--space-xxl);
}

.doc-header h1 {
  font-size: clamp(34px, 5vw, 48px);
  margin-bottom: var(--space-m);
}

.doc-body {
  max-width: 760px;
}

.doc-body h2 {
  font-size: 26px;
  margin-top: var(--space-xxl);
  margin-bottom: var(--space-m);
  scroll-margin-top: 80px;
}

.doc-body h3 {
  font-size: 19px;
  margin-top: var(--space-l);
  margin-bottom: var(--space-s);
}

.doc-body p,
.doc-body li {
  color: var(--text-secondary);
}

.doc-body p + p {
  margin-top: var(--space-m);
}

.doc-body ul,
.doc-body ol {
  margin: var(--space-m) 0;
  padding-left: 1.3em;
  display: grid;
  gap: var(--space-s);
}

.doc-body strong {
  color: var(--text-primary);
  font-weight: 600;
}

.answer-box {
  background: var(--background-secondary);
  border: 1px solid var(--separator);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-s);
  padding: var(--space-l);
  margin-bottom: var(--space-l);
}

.answer-box p {
  color: var(--text-primary);
  font-size: 17px;
}

.meta-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-l);
  padding: var(--space-m) 0;
  border-block: 1px solid var(--separator);
  margin-top: var(--space-l);
}

.meta-item {
  display: grid;
  gap: 2px;
}

.meta-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
}

.meta-value {
  font-family: var(--font-rounded);
  font-weight: 600;
  color: var(--text-primary);
  font-size: 15px;
}

.back-link {
  display: inline-block;
  margin-bottom: var(--space-l);
  font-size: 15px;
  font-weight: 500;
}

.toc {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-s);
  margin-bottom: var(--space-xl);
}

.toc a {
  font-size: 14px;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--separator);
  color: var(--text-secondary);
}

.toc a:hover {
  color: var(--text-primary);
  border-color: var(--text-secondary);
  text-decoration: none;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}