/* FretForge — deep cyber-noir theme, dependency-free */

:root {
  --bg: #020617;
  --bg2: #0f172a;
  --panel: rgba(15, 23, 42, 0.72);
  --line: rgba(30, 41, 59, 0.8);
  --text: #e2e8f0;
  --muted: #64748b;
  --faint: #475569;
  --emerald: #34d399;
  --emerald-dim: rgba(16, 185, 129, 0.15);
  --emerald-ring: rgba(52, 211, 153, 0.4);
  --cyan: #22d3ee;
  --cyan-dim: rgba(34, 211, 238, 0.12);
  --cyan-ring: rgba(34, 211, 238, 0.4);
  --amber: #fbbf24;
  --amber-dim: rgba(245, 158, 11, 0.12);
  --glow: 0 0 24px rgba(16, 185, 129, 0.35), 0 0 60px rgba(16, 185, 129, 0.12);
  --glow-cyan: 0 0 24px rgba(34, 211, 238, 0.3);
  --font: 'Space Grotesk', system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { color-scheme: dark; }

body {
  min-height: 100vh;
  background: var(--bg);
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(16, 185, 129, 0.08), transparent),
    radial-gradient(ellipse 60% 40% at 90% 110%, rgba(34, 211, 238, 0.06), transparent);
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
}

::selection { background: rgba(16, 185, 129, 0.3); }
* { scrollbar-width: thin; scrollbar-color: #334155 transparent; }
*::-webkit-scrollbar { width: 6px; height: 6px; }
*::-webkit-scrollbar-thumb { background: #334155; border-radius: 999px; }

.label {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  backdrop-filter: blur(6px);
}

/* ---------- top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 10px 16px;
  background: rgba(2, 6, 23, 0.82);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-icon {
  width: 36px; height: 36px; display: grid; place-items: center;
  background: var(--emerald-dim); border: 1px solid var(--emerald-ring); border-radius: 12px;
  font-size: 17px;
}
.brand h1 { font-size: 18px; letter-spacing: -0.02em; }
.brand .accent { color: var(--emerald); }
.brand-sub { font-family: var(--mono); font-size: 9px; color: var(--muted); margin-top: -2px; }
.topbar-right { display: flex; gap: 8px; align-items: center; }

.mode-tabs {
  display: flex; gap: 2px; padding: 4px;
  background: var(--bg2); border: 1px solid var(--line); border-radius: 12px;
}
.mode-tabs button {
  border: 1px solid transparent; background: none; color: var(--muted);
  font: 700 11px var(--font); padding: 6px 12px; border-radius: 8px; cursor: pointer;
  transition: all 0.18s;
}
.mode-tabs button:hover { color: var(--text); }
.mode-tabs button.active { background: var(--emerald-dim); border-color: var(--emerald-ring); color: var(--emerald); }

.ai-btn {
  display: flex; align-items: center; gap: 6px;
  background: var(--cyan-dim); border: 1px solid var(--cyan-ring); color: var(--cyan);
  font: 700 11px var(--font); padding: 8px 12px; border-radius: 12px; cursor: pointer;
  transition: all 0.18s;
}
.ai-btn:hover { background: rgba(34, 211, 238, 0.22); box-shadow: var(--glow-cyan); }

/* ---------- layout ---------- */
main { max-width: 1280px; margin: 0 auto; padding: 18px 16px; display: flex; flex-direction: column; gap: 14px; }
.layout { display: grid; grid-template-columns: 340px 1fr; gap: 14px; }
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .topbar-right span { display: none; }
}

/* ---------- controls bar ---------- */
.controls-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; padding: 14px; }
.ctl { display: flex; align-items: center; gap: 8px; }
select {
  background: var(--bg2); color: var(--text); border: 1px solid #334155;
  font: 600 11px var(--mono); padding: 7px 8px; border-radius: 8px; outline: none; cursor: pointer;
}
select:focus { border-color: var(--emerald-ring); }

.chip {
  background: rgba(30, 41, 59, 0.7); color: var(--muted); border: 1px solid transparent;
  font: 700 11px var(--font); padding: 7px 11px; border-radius: 8px; cursor: pointer;
  transition: all 0.15s; letter-spacing: 0.02em;
}
.chip:hover { background: #1e293b; color: var(--text); }
.chip.on { background: var(--emerald-dim); color: var(--emerald); border-color: var(--emerald-ring); }

/* ---------- side panel ---------- */
.side-panel { padding: 16px; display: flex; flex-direction: column; gap: 14px; }
.side-panel h2 { margin-bottom: 2px; }

.grid-6 { display: grid; grid-template-columns: repeat(6, 1fr); gap: 4px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 4px; }
.grid-6 .chip, .grid-3 .chip { text-align: center; padding: 6px 2px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.divider { border-top: 1px solid var(--line); padding-top: 14px; display: flex; flex-direction: column; gap: 10px; }
.row-between { display: flex; align-items: center; justify-content: space-between; }
.mono-val { font: 600 11px var(--mono); color: var(--emerald); }

input[type='range'] {
  width: 100%; height: 6px; appearance: none; -webkit-appearance: none;
  background: #1e293b; border-radius: 999px; cursor: pointer;
}
input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none; width: 16px; height: 16px; border-radius: 999px;
  background: var(--emerald); box-shadow: 0 0 12px rgba(52, 211, 153, 0.5); cursor: pointer;
}
input[type='range']::-moz-range-thumb {
  width: 16px; height: 16px; border: none; border-radius: 999px;
  background: var(--emerald); box-shadow: 0 0 12px rgba(52, 211, 153, 0.5); cursor: pointer;
}

.play-row { display: flex; gap: 8px; }
.play-btn {
  flex: 1; display: flex; align-items: center; justify-content: center; gap: 8px;
  background: rgba(16, 185, 129, 0.2); color: var(--emerald); border: 1px solid var(--emerald-ring);
  font: 700 13px var(--font); padding: 11px; border-radius: 12px; cursor: pointer; transition: all 0.15s;
}
.play-btn:hover { background: rgba(16, 185, 129, 0.3); }
.play-btn:active { transform: scale(0.97); }
.play-btn.strumming { background: var(--emerald); color: #020617; box-shadow: var(--glow); }
.play-btn:disabled { opacity: 0.4; cursor: default; }

/* AI progression strip */
.prog-strip { background: var(--cyan-dim); border: 1px solid var(--cyan-ring); border-radius: 12px; padding: 12px; }
.prog-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.prog-head .tag { font: 700 9px var(--mono); text-transform: uppercase; letter-spacing: 0.15em; color: var(--cyan); }
.prog-head button { background: none; border: none; color: var(--muted); font: 700 10px var(--font); cursor: pointer; }
.prog-head button:hover { color: var(--text); }
.prog-nav { display: flex; align-items: center; justify-content: space-between; }
.prog-nav .cur { font: 700 20px var(--mono); color: #a5f3fc; }
.prog-nav button {
  background: none; border: none; color: var(--cyan); font-size: 18px; cursor: pointer;
  padding: 2px 8px; border-radius: 8px;
}
.prog-nav button:hover { background: rgba(34, 211, 238, 0.2); }
.prog-pills { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 8px; }
.prog-pills button {
  background: #1e293b; color: var(--muted); border: none; border-radius: 5px;
  font: 700 10px var(--mono); padding: 3px 6px; cursor: pointer;
}
.prog-pills button.cur { background: var(--cyan); color: #020617; }
.prog-pills button:hover:not(.cur) { color: var(--cyan); }

/* Explorer */
.id-list { display: flex; flex-direction: column; gap: 6px; }
.id-row {
  display: flex; justify-content: space-between; align-items: center;
  background: var(--bg2); border: 1px solid var(--line); border-radius: 12px; padding: 8px 12px;
}
.id-row.best { background: var(--emerald-dim); border-color: var(--emerald-ring); }
.id-row .nm { font: 700 13px var(--mono); color: var(--text); }
.id-row.best .nm { color: var(--emerald); }
.id-row .q { font-size: 10px; color: var(--muted); }
.hint-text { font-size: 12px; color: var(--muted); line-height: 1.5; }

.ai-id-btn {
  display: flex; align-items: center; justify-content: center; gap: 6px; width: 100%;
  background: var(--cyan-dim); color: var(--cyan); border: 1px solid var(--cyan-ring);
  font: 700 11px var(--font); padding: 9px; border-radius: 12px; cursor: pointer;
}
.ai-id-btn:hover { background: rgba(34, 211, 238, 0.22); }
.ai-id-btn:disabled { opacity: 0.5; }
.ai-id-result { background: var(--cyan-dim); border: 1px solid var(--cyan-ring); border-radius: 12px; padding: 12px; }
.ai-id-result .nm { font: 700 17px var(--mono); color: #a5f3fc; }
.ai-id-result .conf { font: 600 9px var(--mono); text-transform: uppercase; letter-spacing: 0.15em; color: #0891b2; }
.ai-id-result .ex { font-size: 12px; color: #94a3b8; margin-top: 4px; line-height: 1.5; }

.note-tags { display: flex; flex-wrap: wrap; gap: 4px; }
.note-tags span { background: #1e293b; border-radius: 5px; font: 600 11px var(--mono); color: #cbd5e1; padding: 2px 8px; }

/* ---------- fretboard ---------- */
.board-panel { padding: 16px; }
.board-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.board-chord { font: 700 14px var(--mono); color: var(--emerald); }
.board-scroll { overflow-x: auto; }
#fretboard svg { min-width: 900px; width: 100%; user-select: none; }
.board-hint { text-align: center; font: 400 9px var(--mono); color: var(--faint); margin-top: 8px; }
.fb-hit { cursor: pointer; }
.fb-hit:hover { fill: rgba(34, 211, 238, 0.2); }
.fb-marker { cursor: pointer; }
.capo-note { color: var(--amber); }

/* ---------- tuner ---------- */
.tuner-wrap { display: flex; flex-direction: column; gap: 14px; transition: box-shadow 0.3s; border-radius: 12px; }
.tuner-wrap.in-tune { box-shadow: var(--glow); }
.tuner-gauge { position: relative; max-width: 340px; margin: 0 auto; width: 100%; }
#tunerNeedle { transition: transform 0.12s cubic-bezier(0.3, 0.9, 0.4, 1); transform-origin: 150px 140px; }
.tuner-readout { text-align: center; margin-top: -8px; }
.tuner-note { font: 700 30px var(--mono); color: var(--text); }
.tuner-note.ok { color: var(--emerald); }
.tuner-note .oct { font-size: 15px; color: var(--muted); }
.tuner-sub { font: 400 11px var(--mono); color: #94a3b8; }
.tuner-sub .ok { color: var(--emerald); }
.tuner-sub .off { color: var(--amber); }
.tuner-idle { font: 400 11px var(--mono); color: var(--faint); text-align: center; }
.mic-btn {
  display: flex; align-items: center; gap: 6px;
  background: var(--emerald-dim); color: var(--emerald); border: 1px solid var(--emerald-ring);
  font: 700 11px var(--font); padding: 7px 12px; border-radius: 10px; cursor: pointer;
}
.mic-btn.stop { background: rgba(239, 68, 68, 0.12); color: #fca5a5; border-color: rgba(248, 113, 113, 0.4); }
.mic-err { background: var(--amber-dim); border: 1px solid rgba(251, 191, 36, 0.3); color: var(--amber); border-radius: 10px; padding: 10px; font-size: 11px; }
.string-targets { display: grid; grid-template-columns: repeat(6, 1fr); gap: 5px; }
.string-targets div {
  text-align: center; padding: 8px 0; border-radius: 10px;
  background: rgba(30, 41, 59, 0.6); color: var(--muted);
  font: 700 13px var(--mono); transition: all 0.2s;
}
.string-targets div .oct { font-size: 9px; color: var(--faint); }
.string-targets .target { background: var(--amber-dim); color: var(--amber); border: 1px solid rgba(251, 191, 36, 0.5); }
.string-targets .hit { background: rgba(16, 185, 129, 0.25); color: #a7f3d0; border: 1px solid var(--emerald); box-shadow: var(--glow); }

/* ---------- AI sidebar ---------- */
.ai-scrim {
  position: fixed; inset: 0; z-index: 49; background: rgba(2, 6, 23, 0.5);
  opacity: 0; pointer-events: none; transition: opacity 0.25s;
}
.ai-scrim.open { opacity: 1; pointer-events: auto; }
.ai-panel {
  position: fixed; top: 0; right: 0; bottom: 0; z-index: 50;
  width: min(420px, 100vw);
  display: flex; flex-direction: column;
  background: rgba(2, 6, 23, 0.96); border-left: 1px solid #1e293b;
  backdrop-filter: blur(14px);
  transform: translateX(100%); transition: transform 0.3s cubic-bezier(0.32, 0.72, 0.35, 1);
}
.ai-panel.open { transform: translateX(0); }
.ai-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 16px; border-bottom: 1px solid #1e293b;
}
.ai-title { font: 700 13px var(--font); display: flex; align-items: center; gap: 8px; }
.ai-badge {
  font: 600 9px var(--mono); color: var(--cyan);
  background: var(--cyan-dim); border: 1px solid var(--cyan-ring);
  border-radius: 5px; padding: 2px 5px;
}
.icon-btn { background: none; border: none; color: var(--muted); font-size: 14px; cursor: pointer; padding: 6px; border-radius: 8px; }
.icon-btn:hover { background: #1e293b; color: var(--text); }
.ai-messages { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 10px; }
.ai-suggest { display: flex; flex-direction: column; gap: 8px; }
.ai-suggest p { font-size: 12px; color: var(--muted); line-height: 1.5; }
.ai-suggest button {
  background: rgba(15, 23, 42, 0.6); border: 1px solid var(--line); color: #cbd5e1;
  font: 500 12px var(--font); text-align: left; padding: 9px 12px; border-radius: 12px; cursor: pointer;
  transition: all 0.15s;
}
.ai-suggest button:hover { border-color: var(--cyan-ring); color: var(--cyan); }
.msg { max-width: 90%; border-radius: 16px; padding: 10px 14px; font-size: 13px; line-height: 1.55; animation: msg-in 0.25s ease; }
@keyframes msg-in { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.msg.user { align-self: flex-end; background: var(--emerald-dim); color: #d1fae5; border: 1px solid rgba(52, 211, 153, 0.3); }
.msg.ai { align-self: flex-start; background: var(--bg2); color: var(--text); border: 1px solid var(--line); }
.msg.err { background: var(--amber-dim); color: #fde68a; border: 1px solid rgba(251, 191, 36, 0.3); }
.msg .chord-chips { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 8px; }
.msg .chord-chips button {
  background: var(--cyan-dim); border: 1px solid var(--cyan-ring); color: var(--cyan);
  font: 700 11px var(--mono); padding: 4px 8px; border-radius: 8px; cursor: pointer;
}
.msg .chord-chips button:hover { background: rgba(34, 211, 238, 0.25); }
.msg.thinking { color: var(--muted); font-size: 12px; background: none; border: none; }
.ai-form { display: flex; gap: 8px; padding: 12px; border-top: 1px solid #1e293b; }
.ai-form input {
  flex: 1; background: var(--bg2); border: 1px solid var(--line); color: var(--text);
  font: 400 13px var(--font); padding: 10px 12px; border-radius: 12px; outline: none;
}
.ai-form input::placeholder { color: var(--faint); }
.ai-form input:focus { border-color: var(--cyan-ring); }
.ai-form button {
  background: var(--cyan-dim); border: 1px solid var(--cyan-ring); color: var(--cyan);
  padding: 0 14px; border-radius: 12px; cursor: pointer; font-size: 14px;
}
.ai-form button:disabled { opacity: 0.4; }

footer {
  text-align: center; padding: 16px; font: 400 9px var(--mono); color: var(--faint);
  border-top: 1px solid rgba(30, 41, 59, 0.6); margin-top: 20px;
}