/* ==========================================================================
   Sharp Foundations — Design Tokens
   Direction: a home studio after hours — dark ink-navy rooms, a brass-lit
   music stand, an oscilloscope glow. Sheet music and a step sequencer share
   the same desk. The signature motif is staff lines resolving into a
   16-step grid: notation becoming signal.
   ========================================================================== */

:root {
  /* Color */
  --ink:        #1B2130;   /* primary dark background */
  --ink-2:      #242B3D;   /* raised panels on ink */
  --ink-3:      #2E3650;   /* borders / hairlines on ink */
  --paper:      #F3ECDA;   /* manuscript paper — light panels & reading surfaces */
  --paper-2:    #E7DEC6;   /* paper hairlines / muted fills */
  --ink-text:   #1B2130;   /* body text on paper */
  --paper-text: #EFE7D4;   /* body text on ink */
  --paper-dim:  #B9AF95;   /* secondary text on ink */
  --brass:      #C99A55;   /* primary accent — knobs, ink highlights */
  --brass-dim:  #9C7A44;
  --teal:       #4FA69C;   /* secondary accent — signal / waveform */
  --teal-dim:   #3A7D75;

  /* Type */
  --font-display: 'Newsreader', Georgia, 'Times New Roman', serif;
  --font-body:    'Work Sans', -apple-system, Helvetica, Arial, sans-serif;
  --font-mono:    'IBM Plex Mono', 'Courier New', monospace;

  /* Scale */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.75rem;
  --space-4: 2.75rem;
  --space-5: 4.5rem;
  --space-6: 7.5rem;

  --radius: 3px;
  --max-w: 1140px;
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--ink);
  color: var(--paper-text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4 { margin: 0; font-family: var(--font-display); font-weight: 600; }
p { margin: 0; }
button { font-family: inherit; cursor: pointer; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

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

/* ---- Layout helpers ---- */
.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--space-3);
}
.section { padding: var(--space-6) 0; }
.section--tight { padding: var(--space-5) 0; }
.on-paper { background: var(--paper); color: var(--ink-text); }
.on-ink { background: var(--ink); color: var(--paper-text); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brass);
}
.on-paper .eyebrow { color: var(--brass-dim); }

/* ---- Nav ---- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(27, 33, 48, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--ink-3);
}
.site-nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-2);
  padding-bottom: var(--space-2);
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.brand svg { width: 34px; height: 34px; }
.brand-word {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.22rem;
  letter-spacing: 0.01em;
  color: var(--paper-text);
}
.nav-links {
  display: flex;
  gap: var(--space-3);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.03em;
}
.nav-links a {
  position: relative;
  padding: 0.3rem 0;
  color: var(--paper-dim);
  transition: color 0.2s ease;
}
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--brass); }
.nav-links a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 1px;
  background: var(--brass);
}
.nav-toggle { display: none; }

@media (max-width: 720px) {
  .nav-links {
    position: fixed;
    inset: 60px 0 auto 0;
    background: var(--ink);
    border-bottom: 1px solid var(--ink-3);
    flex-direction: column;
    gap: 0;
    padding: var(--space-2) var(--space-3) var(--space-3);
    transform: translateY(-10px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
  }
  .nav-links.is-open { opacity: 1; transform: translateY(0); pointer-events: auto; }
  .nav-links a { display: block; padding: 0.6rem 0; }
  .nav-toggle {
    display: block;
    background: none;
    border: 1px solid var(--ink-3);
    color: var(--paper-text);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    padding: 0.4rem 0.7rem;
    border-radius: var(--radius);
  }
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  padding: 0.75rem 1.3rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: transform 0.15s ease, background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn--brass {
  background: var(--brass);
  color: var(--ink);
}
.btn--brass:hover { background: #dcae68; }
.btn--outline {
  border-color: var(--ink-3);
  color: var(--paper-text);
}
.btn--outline:hover { border-color: var(--brass); color: var(--brass); }
.on-paper .btn--outline { border-color: var(--paper-2); color: var(--ink-text); }
.on-paper .btn--outline:hover { border-color: var(--brass-dim); color: var(--brass-dim); }

/* ---- Hero ---- */
.hero {
  padding-top: var(--space-6);
  padding-bottom: var(--space-6);
  position: relative;
  overflow: hidden;
}
.hero .wrap {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-4);
  align-items: center;
}
.hero h1 {
  font-size: clamp(2.3rem, 4.2vw, 3.5rem);
  line-height: 1.08;
  color: var(--paper-text);
}
.hero h1 em {
  color: var(--brass);
  font-style: italic;
}
.hero p.lede {
  margin-top: var(--space-2);
  max-width: 46ch;
  color: var(--paper-dim);
  font-size: 1.08rem;
}
.hero .actions {
  margin-top: var(--space-3);
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}
.hero-art { width: 100%; height: auto; }

@media (max-width: 860px) {
  .hero .wrap { grid-template-columns: 1fr; }
  .hero-art { max-width: 420px; }
}

/* ---- Instrument grid ---- */
.instrument-grid {
  margin-top: var(--space-4);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--paper-2);
  border: 1px solid var(--paper-2);
}
.instrument-card {
  background: var(--paper);
  padding: var(--space-3) var(--space-2);
  min-height: 140px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: background 0.2s ease;
}
.instrument-card:hover { background: #ece3cb; }
.instrument-card .tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--brass-dim);
}
.instrument-card h3 {
  font-size: 1.15rem;
  margin-top: var(--space-1);
}
@media (max-width: 860px) {
  .instrument-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .instrument-grid { grid-template-columns: 1fr; }
}

/* ---- Section headers ---- */
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}
.section-head h2 {
  font-size: clamp(1.7rem, 3vw, 2.3rem);
  margin-top: 0.4rem;
}

/* ---- Approach / philosophy blocks ---- */
.approach-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}
.approach-item .num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--teal);
}
.approach-item h3 {
  font-size: 1.25rem;
  margin: 0.5rem 0 0.6rem;
}
.approach-item p { color: var(--paper-dim); }
@media (max-width: 860px) {
  .approach-grid { grid-template-columns: 1fr; gap: var(--space-3); }
}

/* ---- Divider (signature motif reused as a rule) ---- */
.staff-divider { display: block; width: 100%; height: auto; margin: 0; }

/* ---- Blog cards ---- */
.post-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}
.post-card {
  border: 1px solid var(--paper-2);
  background: var(--paper);
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.post-card:hover { border-color: var(--brass-dim); transform: translateY(-2px); }
.post-card .meta {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  color: var(--brass-dim);
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}
.post-card h3 { font-size: 1.25rem; line-height: 1.3; }
.post-card p.excerpt { color: #5a5240; font-size: 0.95rem; }
.post-card .read {
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--teal-dim);
}
@media (max-width: 860px) {
  .post-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .post-grid { grid-template-columns: 1fr; }
}

/* ---- Blog index: category filters ---- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: var(--space-4);
}
.filter-chip {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--paper-2);
  border-radius: 999px;
  background: transparent;
  color: var(--ink-text);
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.filter-chip:hover { border-color: var(--brass-dim); }
.filter-chip.is-active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--brass);
}

.archive-list { margin-top: var(--space-5); }
.archive-row {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--paper-2);
}
.archive-row time {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--brass-dim);
  width: 90px;
  flex-shrink: 0;
}
.archive-row a { flex: 1; }
.archive-row a:hover { color: var(--teal-dim); }
.archive-row .cat {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--paper-dim);
  color: #8a8267;
}

/* ---- Post page ---- */
.post-header {
  padding: var(--space-6) 0 var(--space-4);
}
.post-header .meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--brass);
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: var(--space-2);
}
.post-header h1 {
  font-size: clamp(2rem, 4vw, 2.9rem);
  color: var(--paper-text);
  line-height: 1.15;
}
.post-body {
  max-width: 68ch;
  font-size: 1.08rem;
}
.post-body h2 {
  font-size: 1.5rem;
  margin-top: var(--space-4);
  margin-bottom: var(--space-2);
  color: var(--ink-text);
}
.post-body h3 {
  font-size: 1.2rem;
  margin-top: var(--space-3);
  margin-bottom: 0.5rem;
}
.post-body p { margin-bottom: var(--space-2); }
.post-body ul, .post-body ol { margin: 0 0 var(--space-2) 1.3rem; }
.post-body li { margin-bottom: 0.4rem; }
.post-body strong { color: var(--brass-dim); }
.post-body .callout {
  border-left: 3px solid var(--teal);
  padding: var(--space-2) var(--space-3);
  background: #ece3cb;
  margin: var(--space-3) 0;
  font-size: 0.98rem;
}
.post-footer {
  border-top: 1px solid var(--paper-2);
  margin-top: var(--space-4);
  padding-top: var(--space-3);
}

/* ---- Contact ---- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  align-items: start;
}
.contact-item {
  padding: var(--space-3);
  border: 1px solid var(--ink-3);
}
.contact-item .eyebrow { margin-bottom: 0.5rem; }
.contact-item a.big-link {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.4rem;
  color: var(--paper-text);
  border-bottom: 1px solid var(--ink-3);
  padding-bottom: 0.2rem;
  display: inline-block;
}
.contact-item a.big-link:hover { color: var(--brass); border-color: var(--brass); }
.social-list { margin-top: var(--space-2); display: flex; flex-direction: column; gap: 0.6rem; }
.social-list a {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--paper-dim);
}
.social-list a:hover { color: var(--teal); }
.placeholder-note {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--teal);
  margin-top: 0.4rem;
  display: block;
}
@media (max-width: 720px) {
  .contact-grid { grid-template-columns: 1fr; }
}

/* ---- Footer ---- */
.site-footer {
  border-top: 1px solid var(--ink-3);
  padding: var(--space-4) 0;
}
.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.footer-brand { display: flex; align-items: center; gap: 0.6rem; }
.footer-brand svg { width: 22px; height: 22px; }
.footer-note {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--paper-dim);
}

/* ---- Reveal on load ---- */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }