/* Modernized demo styling with light/dark adaptive theme */
:root {
  --color-bg: #f5f7fa;
  --color-surface: #ffffff;
  --color-surface-alt: #f0f3f7;
  --color-border: #d5dce3;
  --color-border-strong: #b6c0ca;
  --color-text: #1f2a37;
  --color-text-subtle: #5a6b7d;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-accent-active: #1e40af;
  --color-danger: #c0342b;
  --color-focus-ring: 0 0 0 3px rgba(37,99,235,.35);
  --radius-sm: 4px;
  --radius-md: 8px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.08), 0 0 0 1px rgba(0,0,0,0.02);
  --shadow-md: 0 4px 10px -2px rgba(0,0,0,.12), 0 2px 4px -1px rgba(0,0,0,.08);
  --font-mono: ui-monospace, SFMono-Regular, Menlo, monospace;
  --transition-fast: 120ms;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0f141a;
    --color-surface: #1b232c;
    --color-surface-alt: #24303b;
    --color-border: #32414f;
    --color-border-strong: #46596b;
    --color-text: #eef2f6;
    --color-text-subtle: #9fb2c4;
    --color-accent: #3b82f6;
    --color-accent-hover: #2563eb;
    --color-accent-active: #1d4ed8;
    --color-danger: #ff6157;
    --color-focus-ring: 0 0 0 3px rgba(59,130,246,.45);
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.6), 0 0 0 1px rgba(255,255,255,0.03);
    --shadow-md: 0 4px 12px -2px rgba(0,0,0,.55), 0 2px 6px -1px rgba(0,0,0,.4);
  }
}

/* Base layout */
html, body { height: 100%; }
body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", Arial, sans-serif;
  margin: 1.5rem auto;
  max-width: 1024px;
  width: 100%;
  line-height: 1.45;
  background: var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
}

/* Ensure hidden attribute always forces display none (overrides later flex rules) */
[hidden] { display: none !important; }

h1 { margin-top: 0; font-size: 1.65rem; letter-spacing: .5px; }
h2 { margin-top: 2.25rem; font-size: 1.25rem; }
.results-heading { padding:0.6rem 0.9rem; letter-spacing:.5px; font-size:1.05rem; margin-top:2.5rem; }
h3 { margin: 1.5rem 0 0.75rem; font-size: 1rem; }

/* Form groups */
.group {
  border: 1px solid var(--color-border);
  padding: 0.85rem 1rem 1rem;
  border-radius: var(--radius-md);
  margin: 0 0 1rem;
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
  position: relative;
}
.group legend { padding: 0 .5rem; font-weight: 600; letter-spacing: .5px; }
.hint { font-size: 0.65rem; color: var(--color-text-subtle); margin: 0 0 0.5rem; }

/* Responsive 3-column layout for the selection workflow */
@media (min-width: 900px) {
  form#voicing-form { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.25rem; align-items: start; }
  form#voicing-form .group { margin: 0; }
  form#voicing-form .actions { grid-column: 1 / -1; }
}

/* Selectors (chips) */
.selectors { display: flex; flex-wrap: wrap; gap: 0.55rem; margin-bottom: 0.2rem; }

.check-wrap, .radio-wrap {
  --chip-bg: var(--color-surface-alt);
  --chip-border: var(--color-border);
  --chip-text: var(--color-text-subtle);
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.68rem;
  line-height: 1;
  padding: 0.4rem 0.55rem 0.42rem;
  border: 1px solid var(--chip-border);
  border-radius: 1000px;
  background: var(--chip-bg);
  color: var(--chip-text);
  cursor: pointer;
  user-select: none;
  position: relative;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.check-wrap:hover, .radio-wrap:hover { background: var(--color-surface); color: var(--color-text); }

.check-wrap input, .radio-wrap input { margin: 0; position: absolute; inset: 0; opacity: 0; cursor: pointer; }

/* Checked state */
.check-wrap input:checked + span, .radio-wrap input:checked + span {
  font-weight: 600;
}
.check-wrap:has(input:checked), .radio-wrap:has(input:checked) {
  --chip-bg: var(--color-accent);
  --chip-border: var(--color-accent);
  --chip-text: #fff;
  background: var(--chip-bg);
  border-color: var(--chip-border);
  color: var(--chip-text);
  box-shadow: 0 1px 3px rgba(0,0,0,0.15);
}

/* Focus ring */
.check-wrap:has(input:focus-visible), .radio-wrap:has(input:focus-visible) {
  outline: none;
  box-shadow: var(--color-focus-ring), 0 1px 3px rgba(0,0,0,0.2);
}

/* Action buttons */
.actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 0.75rem 0 0.5rem; }

button {
  --btn-bg: var(--color-accent);
  --btn-bg-hover: var(--color-accent-hover);
  --btn-bg-active: var(--color-accent-active);
  --btn-text: #fff;
  --btn-border: transparent;
  appearance: none;
  border: 1px solid var(--btn-border);
  background: var(--btn-bg);
  color: var(--btn-text);
  padding: 0.6rem 1.05rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: .5px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  box-shadow: var(--shadow-sm);
}
button:hover { background: var(--btn-bg-hover); }
button:active { background: var(--btn-bg-active); transform: translateY(1px); }
button:focus-visible { outline: none; box-shadow: var(--color-focus-ring), var(--shadow-sm); }

button.secondary {
  --btn-bg: var(--color-surface-alt);
  --btn-bg-hover: var(--color-surface);
  --btn-bg-active: var(--color-surface);
  --btn-text: var(--color-text);
  --btn-border: var(--color-border);
}

/* Results */
.results { display: flex; flex-wrap: wrap; gap: 1.25rem; margin-top: 1.1rem; justify-content: center; text-align: center; }
.chord-block {
  background-color:white;
  border: 1px solid var(--color-border);
  padding: 0.6rem 0.75rem 0.75rem;
  border-radius: var(--radius-md);
  /* background: var(--color-surface); */
  box-shadow: var(--shadow-sm);
  min-width: 215px;
  position: relative;
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}
.chord-block:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }

.chord-title { color: var(--color-surface) ;font-weight: 600; margin-bottom: 0.3rem; text-align: center; font-size: 0.82rem; letter-spacing: .3px; }
.meta { font-size: 0.58rem; color: var(--color-text-subtle); margin-bottom: 0.3rem; text-align: center; }

svg { max-width: 215px; height: auto; display: block; margin: 0 auto; }

/* Messages */
.message { min-height: 1.2rem; font-size: 0.8rem; margin: 0.4rem 0 0.9rem; color: var(--color-text-subtle); }
.message.error { color: var(--color-danger); font-weight: 600; }

/* Export JSON */
.export { margin-top: 2rem; background: var(--color-surface); padding: 0 1.1rem 0; border: 1px solid var(--color-border); border-radius: var(--radius-md); box-shadow: var(--shadow-sm); }
.export[open] { animation: fadeIn .25s ease; }
.export summary { list-style: none; cursor: pointer; }
.export summary::-webkit-details-marker { display:none; }
.export summary h3 { display:inline-block; margin:0; }
#json-output {
  width: 100%;
  min-height: 150px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.6rem 0.7rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
  color: var(--color-text);
  resize: vertical;
  box-sizing: border-box;
  line-height: 1.3;
}
#json-output:focus-visible { outline: none; box-shadow: var(--color-focus-ring); }

/* Scrollbar subtle theming */
#json-output::-webkit-scrollbar { width: 10px; }
#json-output::-webkit-scrollbar-track { background: transparent; }
#json-output::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 20px; border: 2px solid var(--color-surface-alt); }
#json-output::-webkit-scrollbar-thumb:hover { background: var(--color-border-strong); }

/* Utility */
.fade-in { animation: fadeIn .25s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }

/* Reduce motion */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}

/* Header & Footer */
.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: linear-gradient(100deg,var(--color-accent),var(--color-accent-hover));
  color: #fff;
  padding: 0.9rem 1.1rem 1rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  margin: 0 0 1.25rem;
  position: relative;
  /* Allow dropdowns (cart) to extend outside header */
  overflow: visible;
}
.site-header:before, .site-header:after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 15% 20%,rgba(255,255,255,.25),transparent 60%),
              radial-gradient(circle at 85% 80%,rgba(255,255,255,.18),transparent 65%);
  mix-blend-mode: overlay;
  pointer-events: none;
}
.site-header .brand { display:flex; align-items:center; gap:0.75rem; }
.site-header .logo { font-size:1.6rem; line-height:1; filter: drop-shadow(0 2px 2px rgba(0,0,0,.25)); }
.site-header h1 { margin:0; font-size:1.15rem; letter-spacing:.5px; }
.site-header .tagline { margin:0.15rem 0 0; font-size:0.65rem; font-weight:500; opacity:.9; letter-spacing:.5px; }
.site-header .quick-links { display:flex; gap:0.85rem; }
.site-header .quick-links a {
  font-size:0.65rem;
  text-decoration:none;
  background: rgba(255,255,255,.15);
  color:#fff;
  padding:0.4rem 0.65rem 0.42rem;
  border-radius:1000px;
  font-weight:600;
  letter-spacing:.4px;
  transition: background var(--transition-fast), transform var(--transition-fast);
  box-shadow: 0 1px 2px rgba(0,0,0,0.25);
}
.site-header .quick-links a:hover { background: rgba(255,255,255,.27); }
.site-header .quick-links a:active { transform:translateY(1px); }

.site-footer {
  margin: 3rem 0 1rem;
  padding: 1.25rem 1.3rem 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  font-size: 0.85rem;
  line-height:1.4;
  color: var(--color-text-subtle);
  position: relative;
  overflow:hidden;
}
.site-footer a { color: var(--color-accent); text-decoration:none; font-weight:600; }
.site-footer a:hover { text-decoration:underline; }
.site-footer .about { margin:0 0 0.6rem; }
.site-footer .meta { margin:0; display:flex; flex-wrap:wrap; align-items:center; gap:0.35rem; }

@media (min-width: 800px) {
  .site-header h1 { font-size:1.3rem; }
  .site-header .tagline { font-size:0.68rem; }
}

.result-tools { display:flex; flex-wrap:wrap; align-items:center; gap:1rem; margin-top:1.5rem; justify-content: flex-end;}
.result-tools .title-field { font-size:0.7rem; font-weight:600; display:flex; align-items:center; gap:0.4rem; }
.result-tools .title-field input { font-size:0.75rem; padding:0.35rem 0.5rem; border:1px solid var(--color-border); border-radius: var(--radius-sm); background: var(--color-surface); color: var(--color-text); width:16rem; }
.result-tools .title-field input:focus-visible { outline:none; box-shadow: var(--color-focus-ring); }

/* Cart */
.cart-container { position:relative; }
.cart-button { position:relative; background:#fff; color: var(--color-accent); border:1px solid var(--color-border); font-weight:600; }
.cart-button[disabled], .cart-button[aria-disabled="true"] { opacity:.55; cursor:not-allowed; box-shadow:none; }
.cart-button:hover { background:#fff; box-shadow: var(--shadow-sm); }
.cart-count { min-width:1.1rem; height:1.1rem; background:#fff; color: var(--color-accent); border-radius:1000px; display:inline-flex; align-items:center; justify-content:center; font-size:0.6rem; font-weight:700; padding:0 .35rem; }
.cart-dropdown { position:absolute; top:100%; right:0; margin-top:0.5rem; background: var(--color-surface); border:1px solid var(--color-border); border-radius: var(--radius-md); padding:0.7rem 0.75rem 0.85rem; min-width:240px; box-shadow: var(--shadow-md); z-index:50; }
.cart-list { list-style:none; margin:0 0 0.75rem; padding:0; max-height:240px; overflow:auto; display:flex; flex-direction:column; gap:0.4rem; }
.cart-list li { display:flex; align-items:center; gap:0.45rem; font-size:0.65rem; background: var(--color-surface-alt); padding:0.35rem 0.5rem 0.4rem; border:1px solid var(--color-border); border-radius: var(--radius-sm); }
.cart-list li span { flex:1; font-weight:600; letter-spacing:.3px; }
.cart-list li .reorder-btn { --btn-bg: var(--color-surface); --btn-bg-hover: var(--color-surface); --btn-bg-active: var(--color-surface-alt); --btn-text: var(--color-text-subtle); --btn-border: var(--color-border); padding:0.3rem 0.45rem; box-shadow:none; font-size:0.55rem; border-radius:4px; }
.cart-list li .reorder-btn:hover:not(:disabled) { color: var(--color-text); }
.cart-list li .reorder-btn:disabled { opacity:.35; cursor:not-allowed; }
.cart-list li button { --btn-bg: var(--color-danger); --btn-bg-hover:#a52b23; --btn-bg-active:#8f241d; padding:0.35rem 0.5rem; font-size:0.55rem; }
.cart-actions { display:flex; justify-content:space-between; gap:0.6rem; }
.cart-actions button { flex:1; }

.chord-select { position:absolute; top:4px; left:4px; }
.chord-select input { margin:0; }

/* Interval label customisation */
.interval-label-options { display:flex; flex-direction: column; gap:0.4rem; }
.interval-label-row { display:flex; flex-wrap:wrap; align-items:center; gap:0.5rem; font-size:0.82rem; padding:0.35rem 0.5rem; border:1px dashed var(--color-border); border-radius: var(--radius-sm); background: var(--color-surface-alt); }
.interval-label-row span.interval-name { font-weight:600; min-width:120px; }
.interval-label-row input[type="text"] { width:3.2rem; font-size:0.82rem; padding:0.2rem 0.3rem; border:1px solid var(--color-border); border-radius: var(--radius-sm); background: var(--color-surface); color: var(--color-text); }
.interval-label-row input[type="text"]:focus-visible { outline:none; box-shadow: var(--color-focus-ring); }
.interval-label-row label.inline { display:inline-flex; align-items:center; gap:0.25rem; cursor:pointer; }
.interval-label-row input[type="checkbox"] { margin:0; }

/* Intro section */
.intro {
  background: var(--color-surface);
  padding: 1rem 1.2rem 1.25rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  margin: -0.25rem 0 1.5rem;
  position: relative;
  overflow: hidden;
}
.intro:before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg,var(--color-accent) 0 6px,transparent 6px),
    radial-gradient(circle at 85% 25%, rgba(37,99,235,.18), transparent 60%);
  mix-blend-mode: normal;
  pointer-events: none;
  opacity: .12;
}
.intro p { margin: 0; font-size: 0.82rem; }