/* M4RVL Mastering — hardware faceplate styling.
   Palette: warm near-black chassis, brushed dark panels, one gold accent.
   No neon, no glassmorphism — engraved metal and LEDs. */
:root {
  --chassis: #131216;
  --panel: #1d1c21;
  --panel-edge: #2c2a31;
  --ink: #ece5d3;
  --dim: #9a937f;
  --gold: #d9a94a;
  --gold-deep: #a87c2a;
  --red: #ff5340;
  --green: #8fd14f;
  --amber: #ffb340;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { background: #0a0a0c; }
body {
  font-family: "Avenir Next", "Segoe UI", system-ui, -apple-system, sans-serif;
  color: var(--ink);
  min-height: 100vh;
  background:
    radial-gradient(1200px 600px at 50% -10%, #1b1a20 0%, #0a0a0c 60%),
    #0a0a0c;
  padding: 28px 14px 40px;
}
.room { max-width: 1180px; margin: 0 auto; }

/* ---------- the unit ---------- */
.unit {
  position: relative;
  background:
    repeating-linear-gradient(90deg, rgba(255,255,255,0.012) 0 2px, transparent 2px 4px),
    linear-gradient(180deg, #1a191e 0%, var(--chassis) 8%, #100f12 100%);
  border: 1px solid #33313a;
  border-radius: 14px;
  box-shadow: 0 30px 80px rgba(0,0,0,0.75), 0 4px 18px rgba(0,0,0,0.6),
    inset 0 1px 0 rgba(255,255,255,0.06);
  padding: 26px 26px 20px;
}
.screw {
  position: absolute; width: 15px; height: 15px; border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #5a5763, #26242b 70%);
  box-shadow: inset 0 1px 2px rgba(255,255,255,0.25), 0 1px 2px rgba(0,0,0,0.8);
}
.screw::after {
  content: ""; position: absolute; left: 2px; right: 2px; top: 6.5px; height: 2px;
  background: #101013; transform: rotate(38deg); border-radius: 1px;
}
.screw.tl { top: 10px; left: 10px; } .screw.tr { top: 10px; right: 10px; }
.screw.bl { bottom: 10px; left: 10px; } .screw.br { bottom: 10px; right: 10px; }

.panel {
  background: linear-gradient(180deg, #222127, var(--panel) 30%, #19181d);
  border: 1px solid var(--panel-edge);
  border-radius: 9px;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.05), inset 0 -12px 24px rgba(0,0,0,0.25),
    0 2px 6px rgba(0,0,0,0.35);
}

/* ---------- top bar ---------- */
.topbar { display: flex; justify-content: space-between; align-items: flex-end; padding: 2px 6px 18px; }
.brand-name {
  font-size: 30px; font-weight: 800; letter-spacing: 0.14em; color: var(--ink);
  text-shadow: 0 2px 3px rgba(0,0,0,0.7);
}
.brand-name span { color: var(--gold); }
.brand-sub { margin-top: 3px; font-size: 10.5px; letter-spacing: 0.34em; color: var(--dim); }
.top-right { text-align: right; }
.addr { font-size: 12px; letter-spacing: 0.18em; color: var(--dim); }
.power { margin-top: 6px; font-size: 10.5px; letter-spacing: 0.3em; color: var(--dim); display: flex; gap: 7px; align-items: center; justify-content: flex-end; }
.led { width: 8px; height: 8px; border-radius: 50%; background: #3a382f; display: inline-block; }
.led.on { background: var(--amber); box-shadow: 0 0 8px 2px rgba(255,179,64,0.55); }

/* ---------- deck ---------- */
.deck { padding: 16px 18px 14px; }
.drop {
  border: 1.5px dashed #45424e; border-radius: 8px; padding: 20px 16px; text-align: center;
  cursor: pointer; transition: border-color .15s, background .15s;
  background: rgba(0,0,0,0.22);
}
.drop:hover, .drop.over { border-color: var(--gold); background: rgba(217,169,74,0.06); }
.drop-title { font-size: 16.5px; font-weight: 650; letter-spacing: 0.04em; }
.drop-sub { margin-top: 5px; font-size: 12px; color: var(--dim); letter-spacing: 0.03em; }
#wave { width: 100%; height: 74px; display: block; margin-top: 14px; background: #121116; border-radius: 6px; border: 1px solid #2a2830; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.chip {
  font-size: 10.5px; letter-spacing: 0.16em; color: var(--dim);
  background: #121116; border: 1px solid #2a2830; border-radius: 5px; padding: 6px 10px;
}
.chip b { color: var(--ink); font-weight: 700; margin-left: 4px; letter-spacing: 0.04em; }
.chip.master b { color: var(--gold); }

/* ---------- modes ---------- */
.modes { margin-top: 14px; padding: 14px 18px; display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.mode-group { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.mode-btn {
  font: inherit; font-size: 12.5px; font-weight: 750; letter-spacing: 0.14em;
  color: var(--dim); background: linear-gradient(180deg, #2a292f, #1b1a1f);
  border: 1px solid #3a3842; border-radius: 6px; padding: 10px 16px; cursor: pointer;
  box-shadow: 0 3px 0 #0c0c0e, inset 0 1px 0 rgba(255,255,255,0.07);
}
.mode-btn:active { transform: translateY(2px); box-shadow: 0 1px 0 #0c0c0e; }
.mode-btn.active { color: #171408; background: linear-gradient(180deg, #ecc26a, var(--gold) 60%, var(--gold-deep)); border-color: #8a6520; }
.mode-btn.rescue.active { background: linear-gradient(180deg, #ffd9a0, #f0a04b 60%, #c47b28); border-color: #8a5a20; }
.intensity { display: flex; gap: 5px; align-items: center; margin-left: 8px; }
.intensity span { font-size: 10px; letter-spacing: 0.24em; color: var(--dim); margin-right: 2px; }
.intensity button {
  font: inherit; font-size: 10.5px; letter-spacing: 0.1em; padding: 6px 9px; cursor: pointer;
  color: var(--dim); background: #17161a; border: 1px solid #35333c; border-radius: 4px;
}
.intensity button.active { color: var(--gold); border-color: var(--gold-deep); }
.mode-note { font-size: 12.5px; color: var(--dim); letter-spacing: 0.02em; flex: 1; min-width: 220px; }

/* ---------- rack ---------- */
.rack { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 14px; }
.module { padding: 14px 14px 12px; display: flex; flex-direction: column; }
.mod-head { font-size: 11px; font-weight: 750; letter-spacing: 0.26em; color: var(--ink); display: flex; align-items: center; gap: 8px; }
.mod-led { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 6px 1px rgba(143,209,79,0.5); }
.mod-foot { margin-top: auto; padding-top: 10px; font-size: 10px; letter-spacing: 0.18em; color: var(--dim); text-align: center; }
.knobs { display: flex; flex-wrap: wrap; gap: 6px 2px; justify-content: space-around; margin-top: 14px; }
.knob-cell { width: 76px; text-align: center; }
.knob {
  width: 58px; height: 58px; margin: 0 auto; border-radius: 50%; cursor: ns-resize;
  background:
    radial-gradient(circle at 34% 28%, #55525e, #33313a 42%, #1c1b20 78%, #121116);
  border: 1px solid #45434e;
  box-shadow: 0 5px 10px rgba(0,0,0,0.65), inset 0 2px 3px rgba(255,255,255,0.18),
    inset 0 -6px 10px rgba(0,0,0,0.55);
  position: relative; touch-action: none; user-select: none; -webkit-user-select: none;
}
.knob::before { /* knurled edge hint */
  content: ""; position: absolute; inset: -5px; border-radius: 50%;
  background: repeating-conic-gradient(rgba(255,255,255,0.05) 0deg 4deg, transparent 4deg 12deg);
  -webkit-mask: radial-gradient(circle, transparent 62%, #000 63%);
          mask: radial-gradient(circle, transparent 62%, #000 63%);
}
.knob .pointer {
  position: absolute; left: 50%; top: 50%; width: 3px; height: 21px; margin-left: -1.5px;
  background: var(--gold); border-radius: 2px; transform-origin: 50% 0;
  box-shadow: 0 0 4px rgba(217,169,74,0.6);
}
.knob-label { margin-top: 9px; font-size: 9.5px; letter-spacing: 0.2em; color: var(--dim); }
.knob-value { font-size: 12px; font-weight: 700; color: var(--ink); margin-top: 2px; font-variant-numeric: tabular-nums; }

/* meters */
.meter-wrap { margin-top: 14px; }
.meter-label { font-size: 9.5px; letter-spacing: 0.24em; color: var(--dim); margin-bottom: 6px; text-align: center; }
.ledbar { display: flex; gap: 2.5px; justify-content: center; }
.ledbar i { width: 9px; height: 15px; border-radius: 2px; background: #26242b; box-shadow: inset 0 1px 2px rgba(0,0,0,0.7); }
.ledbar i.g { background: var(--green); box-shadow: 0 0 5px rgba(143,209,79,0.45); }
.ledbar i.a { background: var(--amber); box-shadow: 0 0 5px rgba(255,179,64,0.45); }
.ledbar i.r { background: var(--red); box-shadow: 0 0 5px rgba(255,83,64,0.5); }

.ceiling-plate {
  margin-top: 14px; text-align: center; font-size: 10.5px; letter-spacing: 0.2em; color: var(--dim);
  background: #121116; border: 1px solid #2a2830; border-radius: 5px; padding: 7px 4px;
}
.ceiling-plate b { color: var(--gold); }
#spectrum { width: 100%; height: 62px; margin-top: 14px; background: #121116; border: 1px solid #2a2830; border-radius: 6px; }

/* ---------- notes ---------- */
.notes { margin-top: 14px; padding: 14px 18px; }
.notes-head { font-size: 10.5px; font-weight: 750; letter-spacing: 0.26em; color: var(--gold); }
.notes ul { margin: 9px 0 2px 16px; }
.notes li { font-size: 13px; line-height: 1.55; color: var(--ink); margin-top: 3px; }
.notes li::marker { color: var(--gold-deep); }

/* ---------- transport ---------- */
.transport { margin-top: 14px; padding: 13px 16px; display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.tbtn {
  font: inherit; font-size: 12.5px; font-weight: 750; letter-spacing: 0.12em;
  color: var(--ink); background: linear-gradient(180deg, #2e2c34, #1b1a1f);
  border: 1px solid #3d3b46; border-radius: 6px; padding: 11px 18px; cursor: pointer;
  box-shadow: 0 3px 0 #0c0c0e, inset 0 1px 0 rgba(255,255,255,0.07);
}
.tbtn:disabled { opacity: 0.4; cursor: default; }
.tbtn.render { color: #171408; background: linear-gradient(180deg, #ecc26a, var(--gold) 60%, var(--gold-deep)); border-color: #8a6520; }
.tbtn.render:disabled { color: var(--dim); background: #222127; border-color: #35333c; }
.ab { display: flex; border: 1px solid #3d3b46; border-radius: 6px; overflow: hidden; }
.ab button {
  font: inherit; font-size: 11px; font-weight: 700; letter-spacing: 0.12em;
  padding: 9px 13px; background: #17161a; color: var(--dim); border: 0; cursor: pointer;
}
.ab button.active { background: #33302a; color: var(--gold); }
.pos { font-size: 12.5px; color: var(--dim); font-variant-numeric: tabular-nums; }
.spacer { flex: 1; }
.status { font-size: 12.5px; color: var(--dim); letter-spacing: 0.02em; }

.fineprint { text-align: center; color: #5d594e; font-size: 11.5px; margin-top: 16px; letter-spacing: 0.04em; }

@media (max-width: 980px) { .rack { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) {
  .rack { grid-template-columns: 1fr; }
  .brand-name { font-size: 23px; }
  .unit { padding: 20px 14px 14px; }
}