/* Violin Skills — marketing site
 *
 * The palette is not a marketing palette: it is the app's own theme tokens
 * (src/constants/theme.ts), including the three intonation colours the app
 * uses to grade a note — in tune / slightly off / clearly off. The site is
 * organised around the same measurement the app is about.
 */

:root {
  --ink: #1a1d23;
  --ink-2: #676d79;
  --paper: #fafafc;
  --surface: #f0f1f5;
  --line: #e6e8ef;
  --indigo: #4f46e5;
  --indigo-ink: #ffffff;
  --indigo-soft: #eceafd;
  /* Sits one step above --surface, so controls read as raised on a panel. */
  --raise: #ffffff;

  /* Intonation grading, straight from the app */
  --true: #1e8e3e;
  --true-soft: #d9ecdf;
  --near: #b8860b;
  --off: #c5221f;

  --display: 'Fraunces', Georgia, serif;
  --body: 'Public Sans', system-ui, -apple-system, sans-serif;
  --mono: 'DM Mono', ui-monospace, 'SFMono-Regular', monospace;

  --gutter: clamp(1.25rem, 5vw, 3rem);
  --measure: 1100px;
  --radius: 16px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f2f3f5;
    --ink-2: #9ba1ab;
    --paper: #0b0d10;
    --surface: #171a1f;
    --line: #22262e;
    --indigo: #8b93f8;
    --indigo-ink: #0b0d10;
    --indigo-soft: #1b1e33;
    --raise: #252a32;
    --true: #4ade80;
    --true-soft: #12301f;
    --near: #facc15;
    --off: #f87171;
  }
}

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

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  /* 17px base — the app's own base size; this audience likes large UI. */
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3 {
  font-family: var(--display);
  font-variation-settings: 'SOFT' 0, 'WONK' 1;
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0;
  text-wrap: balance;
}

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

a {
  color: inherit;
}

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

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

.wrap {
  width: 100%;
  max-width: var(--measure);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* Small caps-ish mono label. Used for anything that is a measurement or a
   category — never as decoration. */
.tag {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-2);
  margin: 0;
}

/* ---------------------------------------------------------------- topbar */

.topbar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  padding-block: 1.25rem;
}

/* Four items only just fit a 500px viewport. On a real phone the section
   anchors are the ones worth dropping — the repo link is not. */
@media (max-width: 560px) {
  .topbar a[href^='#'] {
    display: none;
  }
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 600;
  text-decoration: none;
  margin-right: auto;
}

.brand img {
  width: 30px;
  height: 30px;
  border-radius: 8px;
}

.topbar a:not(.brand) {
  font-size: 0.95rem;
  text-decoration: none;
  color: var(--ink-2);
}

.topbar a:not(.brand):hover {
  color: var(--ink);
}

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

.hero {
  display: grid;
  gap: clamp(2.5rem, 6vw, 4rem);
  padding-block: clamp(2.5rem, 7vw, 5rem) clamp(3rem, 8vw, 6rem);
  align-items: center;
}

@media (min-width: 940px) {
  .hero {
    grid-template-columns: 1fr 1.05fr;
  }
}

.hero h1 {
  font-size: clamp(2.9rem, 7.5vw, 4.75rem);
  margin-block: 0.75rem 1.25rem;
}

.hero-lead {
  font-size: 1.2rem;
  color: var(--ink-2);
  max-width: 34ch;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.4rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font: inherit;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  cursor: pointer;
  background: none;
  color: var(--ink);
}

.btn-primary {
  background: var(--indigo);
  color: var(--indigo-ink);
}

.btn-quiet {
  border-color: var(--line);
  background: var(--surface);
}

.btn:hover {
  filter: brightness(1.06);
}

.cta-note {
  margin-top: 0.9rem;
  font-size: 0.9rem;
  color: var(--ink-2);
}

/* ------------------------------------------------- the instrument (hero) */

.instrument {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(1.25rem, 3vw, 1.75rem);
}

.readout {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  min-height: 4.5rem;
}

.readout-note {
  font-family: var(--display);
  font-variation-settings: 'SOFT' 0, 'WONK' 1;
  font-size: 3.5rem;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.03em;
}

.readout-cents {
  font-family: var(--mono);
  font-size: 1.5rem;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

.readout-hz {
  font-family: var(--mono);
  font-size: 0.95rem;
  color: var(--ink-2);
  margin-left: auto;
  font-variant-numeric: tabular-nums;
}

/* Grade the readout the way the app grades a note. */
.readout[data-grade='true'] .readout-cents {
  color: var(--true);
}
.readout[data-grade='near'] .readout-cents {
  color: var(--near);
}
.readout[data-grade='off'] .readout-cents {
  color: var(--off);
}
/* Idle is its own state, not a dimmed reading. */
.readout-idle {
  display: none;
  font-family: var(--mono);
  font-size: 0.95rem;
  color: var(--ink-2);
  align-self: center;
}

.readout[data-grade='idle'] .readout-idle {
  display: block;
}

.readout[data-grade='idle'] .readout-note,
.readout[data-grade='idle'] .readout-cents,
.readout[data-grade='idle'] .readout-hz {
  display: none;
}

.scale {
  position: relative;
  margin-top: 0.5rem;
}

.scale svg {
  display: block;
  width: 100%;
  height: 104px;
  overflow: visible;
}

.tick {
  stroke: var(--ink-2);
  opacity: 0.5;
}

.tick-major {
  stroke: var(--ink-2);
  opacity: 0.85;
  stroke-width: 1.5;
}

.band {
  fill: var(--true-soft);
}

.needle {
  stroke: var(--ink);
  stroke-width: 3.5;
  stroke-linecap: round;
  transition: transform 90ms linear;
}

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

.scale-labels {
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--ink-2);
  margin-top: 0.35rem;
}

.instrument-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.5rem;
}

.chip {
  font: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.6rem 1.1rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--raise);
  color: var(--ink);
  cursor: pointer;
}

.chip[aria-pressed='true'] {
  background: var(--indigo);
  border-color: var(--indigo);
  color: var(--indigo-ink);
}

.instrument-status {
  margin-top: 0.9rem;
  font-size: 0.9rem;
  color: var(--ink-2);
  min-height: 1.4em;
}

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

.section {
  padding-block: clamp(3.5rem, 9vw, 6.5rem);
  border-top: 1px solid var(--line);
}

.section h2 {
  font-size: clamp(2rem, 4.5vw, 3rem);
  margin-block: 0.6rem 1rem;
  max-width: 20ch;
}

.section-lead {
  color: var(--ink-2);
  max-width: 58ch;
  font-size: 1.1rem;
}

/* ----------------------------------------------------------------- tools */

.tools {
  display: grid;
  gap: 1px;
  margin-top: 3rem;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  grid-template-columns: 1fr;
}

@media (min-width: 700px) {
  .tools {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1000px) {
  .tools {
    grid-template-columns: repeat(3, 1fr);
  }
}

.tool {
  background: var(--paper);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.tool h3 {
  font-size: 1.4rem;
}

.tool p {
  color: var(--ink-2);
  font-size: 0.98rem;
}

/* The spec line is the point: each tool is defined by a real number. */
.tool .tag {
  color: var(--indigo);
}

/* --------------------------------------------------------------- screens */

.screens {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  margin-top: 3rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.screen figcaption {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--ink-2);
  margin-top: 0.9rem;
  text-align: center;
}

/* Phone captures are all 600×1267. Pin the rendered width rather than capping
   height: with max-height the final size depends on each column's width, so
   the same phone came out at a different scale in each section. */
.screen img {
  width: 100%;
  max-width: 300px;
  height: auto;
  margin-inline: auto;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: var(--surface);
}

/* --------------------------------------------------------------- grading */

.grades {
  display: grid;
  gap: 1rem;
  margin-top: 2.5rem;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.grade {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem;
  background: var(--surface);
}

.grade-value {
  font-family: var(--mono);
  font-size: 1.6rem;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

.grade p {
  color: var(--ink-2);
  font-size: 0.95rem;
  margin-top: 0.2rem;
}

.grade-true .grade-value {
  color: var(--true);
}
.grade-near .grade-value {
  color: var(--near);
}
.grade-off .grade-value {
  color: var(--off);
}

/* --------------------------------------------------------------- two-col */

.split {
  display: grid;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

@media (min-width: 860px) {
  .split {
    grid-template-columns: 1fr 320px;
  }
}

/* ----------------------------------------------------------------- facts */

.facts {
  list-style: none;
  padding: 0;
  margin: 2.5rem 0 0;
  display: grid;
  gap: 2rem 2.5rem;
  /* Four facts: 320px settles into a 2×2 block rather than 3 across with an
     orphan on the second row. */
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

.facts h3 {
  font-size: 1.15rem;
  font-family: var(--body);
  font-weight: 600;
  letter-spacing: 0;
  margin-bottom: 0.3rem;
}

.facts p {
  color: var(--ink-2);
  font-size: 0.98rem;
}

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

.footer {
  border-top: 1px solid var(--line);
  padding-block: 3rem 4rem;
  color: var(--ink-2);
  font-size: 0.95rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

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

/* ------------------------------------------------------------------ prose */

.prose {
  max-width: 68ch;
  padding-block: clamp(2rem, 6vw, 4rem) 5rem;
}

.prose h1 {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  margin-bottom: 1rem;
}

.prose h2 {
  font-size: 1.5rem;
  margin-top: 2.75rem;
  margin-bottom: 0.65rem;
}

.prose p,
.prose li {
  color: var(--ink-2);
  margin-bottom: 1rem;
}

.prose strong {
  color: var(--ink);
}

.prose ul {
  padding-left: 1.2rem;
}

.prose .updated {
  font-family: var(--mono);
  font-size: 0.85rem;
}