/* tozo-eq — design tokens first, components after.
   Palette: near-black neutrals + single amber accent.
   Surfaces: soft neumorphic elevation on cards/controls, tinted glass on the
   topbar + modal, recessed wells for inputs, and a faint ambient amber wash
   behind everything so the glass has something to refract. */

:root {
  --bg:        #0c0d10;
  --panel:     #131519;
  --panel-2:   #191c21;
  --border:    #24282f;
  --border-2:  #2e333b;
  --text:      #e7e9ec;
  --text-dim:  #979da6;
  --text-faint:#5f656e;
  --accent:    #e8a33d;
  --accent-dim:#a3712a;
  --ok:        #58b368;
  --err:       #d96a6a;
  --rx:        #7aa2c9;

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
          "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "JetBrains Mono",
          Menlo, Consolas, monospace;

  --r-card: 12px;
  --r-ctl:  8px;
  --sp: 8px;

  /* elevation + glass tokens (bold pass — dial back to taste) */
  --shadow-raise:   12px 14px 34px rgba(0, 0, 0, 0.62), -9px -9px 26px rgba(255, 255, 255, 0.04);
  --shadow-inset-hi: inset 0 1px 0 rgba(255, 255, 255, 0.08);
  --shadow-well:    inset 0 3px 9px rgba(0, 0, 0, 0.72), inset 0 1px 2px rgba(0, 0, 0, 0.5);
  --glass-bg:       color-mix(in srgb, #1b2027 58%, transparent);
  --glass-border:   1px solid rgba(255, 255, 255, 0.14);
  --glass-blur:     blur(22px) saturate(165%);
}

* { box-sizing: border-box; }

html { color-scheme: dark; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* faint ambient wash so the glass surfaces have something to refract */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(1200px 700px at 10% -10%, rgba(232, 163, 61, 0.16), transparent 62%),
    radial-gradient(1000px 600px at 100% 0%, rgba(122, 162, 201, 0.11), transparent 58%),
    radial-gradient(800px 800px at 50% 118%, rgba(232, 163, 61, 0.08), transparent 60%);
}

code { font-family: var(--mono); font-size: 0.92em; color: var(--text-dim); }

/* ---------- banner ---------- */

.banner {
  padding: 10px 24px;
  background: #2a1d10;
  border-bottom: 1px solid #4a3517;
  color: #e5c089;
  font-size: 13px;
  text-align: center;
}

/* ---------- top bar (tinted glass) ---------- */

.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  gap: calc(var(--sp) * 2);
  padding: 0 24px;
  height: 56px;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
}

.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark { width: 22px; height: 22px; color: var(--accent); }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text strong { font-size: 15px; letter-spacing: -0.01em; }
.brand-text span { font-size: 11.5px; color: var(--text-dim); }

.topbar-right { display: flex; align-items: center; gap: calc(var(--sp) * 1.5); }

.device-pill {
  display: flex; align-items: center; gap: 8px;
  padding: 5px 12px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 12.5px; color: var(--text-dim);
  font-family: var(--mono);
  max-width: 260px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  box-shadow: var(--shadow-inset-hi);
}

.dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--text-faint); flex: none;
}
.dot.on { background: var(--ok); }
.dot.err { background: var(--err); }

.all-devices {
  display: flex; align-items: center; gap: 6px;
  font-size: 12px; color: var(--text-dim); cursor: pointer;
  user-select: none;
}
.all-devices input { accent-color: var(--accent); }

/* ---------- buttons (soft neumorphic) ---------- */

.btn {
  font: inherit; font-size: 13px; font-weight: 500;
  color: var(--text);
  background: var(--panel-2);
  border: 1px solid var(--border-2);
  border-radius: var(--r-ctl);
  padding: 7px 14px;
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.35), var(--shadow-inset-hi);
  transition: background 120ms, border-color 120ms, box-shadow 120ms, opacity 120ms;
}
.btn:hover:not(:disabled) {
  background: #21252c; border-color: #3a404a;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.45), var(--shadow-inset-hi);
}
.btn:active:not(:disabled) { background: #1b1f25; box-shadow: var(--shadow-well); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; box-shadow: none; }
.btn:focus-visible { outline: 2px solid var(--accent-dim); outline-offset: 1px; }

.btn-accent {
  background: var(--accent); border-color: var(--accent);
  color: #1a1206; font-weight: 600;
  box-shadow: 0 3px 10px rgba(232, 163, 61, 0.22), inset 0 1px 0 rgba(255, 255, 255, 0.25);
}
.btn-accent:hover:not(:disabled) {
  background: #f0ae4d; border-color: #f0ae4d;
  box-shadow: 0 5px 16px rgba(232, 163, 61, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.3);
}
.btn-accent:active:not(:disabled) { box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.28); }

.btn-ghost { background: transparent; border-color: transparent; color: var(--text-dim); box-shadow: none; }
.btn-ghost:hover:not(:disabled) {
  background: var(--panel-2); color: var(--text);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3), var(--shadow-inset-hi);
}

.btn-xs { font-size: 11.5px; padding: 3px 8px; }

.btn.confirm { background: #3a2a12; border-color: var(--accent-dim); color: var(--accent); }

/* ---------- layout ---------- */

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 20px;
  max-width: 1240px;
  margin: 24px auto;
  padding: 0 24px;
  align-items: start;
}

.sidebar { display: flex; flex-direction: column; gap: 20px; }

.card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  border-radius: var(--r-card);
  padding: 18px 20px 20px;
  box-shadow: var(--shadow-raise), var(--shadow-inset-hi);
}

.card-head {
  display: flex; align-items: baseline; justify-content: space-between;
  margin-bottom: 14px;
}
.card-head h2 {
  margin: 0;
  font-size: 11px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.09em;
  color: var(--text-dim);
}

.hint { font-size: 12px; color: var(--text-faint); margin: 10px 0 0; }

/* ---------- curve ---------- */

#curve { width: 100%; height: 240px; display: block; }

.legend {
  display: flex; gap: 16px;
  font-size: 11.5px; color: var(--text-dim);
  margin-top: 6px;
}
.legend-item { display: flex; align-items: center; gap: 6px; }
.swatch { width: 14px; height: 3px; border-radius: 2px; display: inline-block; }
.swatch-current { background: var(--accent); }
.swatch-target  { background: var(--text-faint); }

.fit-stats { font-family: var(--mono); font-size: 11.5px; color: var(--text-dim); }

/* ---------- band sliders ---------- */

.bands-wrap { position: relative; margin-top: 18px; }

.bands {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: 6px;
  padding: 16px 8px 12px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-well);
}

.band { display: flex; flex-direction: column; align-items: center; gap: 8px; }

.band-db {
  font-family: var(--mono); font-size: 11.5px;
  color: var(--text); font-variant-numeric: tabular-nums;
  min-width: 44px; text-align: center;
}
.band-db.pos { color: var(--accent); }

input[type="range"].band-slider {
  writing-mode: vertical-lr;
  direction: rtl;
  height: 170px; width: 22px;
  appearance: none; -webkit-appearance: none;
  background: transparent;
  cursor: ns-resize;
  margin: 0;
}
input[type="range"].band-slider::-webkit-slider-runnable-track {
  width: 4px; border-radius: 2px;
  background: var(--border-2);
}
input[type="range"].band-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--text);
  border: 3px solid var(--panel-2);
  box-shadow: 0 0 0 1px var(--border-2), 0 2px 5px rgba(0, 0, 0, 0.5);
  margin-left: -7px;
  transition: background 100ms;
}
input[type="range"].band-slider:hover::-webkit-slider-thumb { background: var(--accent); }
input[type="range"].band-slider:focus-visible::-webkit-slider-thumb {
  background: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-dim);
}

.band-freq {
  font-family: var(--mono); font-size: 11px; color: var(--text-dim);
}

.band-q {
  width: 46px;
  font-family: var(--mono); font-size: 11px;
  color: var(--text-dim);
  background: var(--bg);
  border: 1px solid var(--border-2);
  border-radius: 6px;
  padding: 2px 4px;
  text-align: center;
  box-shadow: var(--shadow-well);
}
.band-q:focus { outline: 1px solid var(--accent-dim); color: var(--text); }
.band-q-label { font-size: 9.5px; color: var(--text-faint); letter-spacing: 0.06em; }

/* one-time "swipe for more" hint over the band strip (small screens only) */
.swipe-hint {
  position: absolute; z-index: 3;
  right: 12px; top: 50%;
  transform: translateY(-50%);
  display: inline-flex; align-items: center;
  padding: 6px 12px;
  font-size: 11.5px; font-weight: 600; color: #1a1206;
  background: var(--accent);
  border-radius: 999px;
  box-shadow: 0 3px 12px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.25);
  pointer-events: none;
  transition: opacity 300ms ease;
}
.swipe-hint[hidden] { display: none; }
.swipe-hint.gone { opacity: 0; }
@media (min-width: 701px) { .swipe-hint { display: none; } }
@media (prefers-reduced-motion: no-preference) {
  .swipe-hint:not(.gone) { animation: hint-nudge 1.6s ease-in-out infinite; }
  @keyframes hint-nudge {
    0%, 100% { transform: translateY(-50%) translateX(0); }
    50%      { transform: translateY(-50%) translateX(5px); }
  }
}

/* ---------- transport ---------- */

.transport {
  display: flex; gap: 10px; flex-wrap: wrap;
  margin-top: 18px;
}

/* ---------- presets ---------- */

.presets { display: flex; flex-wrap: wrap; gap: 8px; }

.chip {
  font: inherit; font-size: 12.5px;
  color: var(--text-dim);
  background: var(--panel-2);
  border: 1px solid var(--border-2);
  border-radius: 999px;
  padding: 5px 12px;
  cursor: pointer;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3), var(--shadow-inset-hi);
  transition: color 100ms, border-color 100ms, box-shadow 100ms;
}
.chip:hover {
  color: var(--text); border-color: #3a404a;
  box-shadow: 0 3px 9px rgba(0, 0, 0, 0.4), var(--shadow-inset-hi);
}
.chip:active { box-shadow: var(--shadow-well); }
.chip.active {
  color: var(--accent); border-color: var(--accent-dim);
  background: #1d1710;
  box-shadow: 0 0 0 1px rgba(232, 163, 61, 0.15), 0 3px 10px rgba(0, 0, 0, 0.4);
}

/* ---------- segmented control (import mode) ---------- */

.seg {
  display: flex; gap: 4px;
  padding: 4px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  box-shadow: var(--shadow-well);
}
.seg-btn {
  flex: 1;
  font: inherit; font-size: 12.5px; font-weight: 500;
  color: var(--text-dim);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 6px 12px;
  cursor: pointer;
  transition: color 120ms, background 120ms, border-color 120ms, box-shadow 120ms;
}
.seg-btn:hover { color: var(--text); }
.seg-btn:focus-visible { outline: 2px solid var(--accent-dim); outline-offset: 1px; }
.seg-btn.active {
  color: var(--accent);
  background: #1d1710;
  border-color: var(--accent-dim);
  box-shadow: 0 0 0 1px rgba(232, 163, 61, 0.15), 0 2px 8px rgba(0, 0, 0, 0.4),
              var(--shadow-inset-hi);
}
.seg-help { margin: 10px 0 0; color: var(--text-dim); }
.seg-help strong { color: var(--text); font-weight: 600; }
.seg-help em { color: var(--accent); font-style: normal; }

/* ---------- import ---------- */

textarea {
  width: 100%;
  font-family: var(--mono); font-size: 12px; line-height: 1.55;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border-2);
  border-radius: var(--r-ctl);
  padding: 10px 12px;
  resize: vertical;
  margin: 12px 0;
  box-shadow: var(--shadow-well);
}
textarea::placeholder { color: var(--text-faint); }
textarea:focus { outline: 1px solid var(--accent-dim); }

.import-row { display: flex; gap: 8px; }
.file-btn { display: inline-flex; align-items: center; }

.fit-note {
  margin-top: 10px;
  font-family: var(--mono); font-size: 12px;
  padding: 8px 10px;
  border-radius: var(--r-ctl);
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-dim);
  box-shadow: var(--shadow-well);
}
.fit-note.err { color: var(--err); border-color: #4a2626; }

/* ---------- log ---------- */

.log-card { padding-bottom: 12px; }

.log {
  font-family: var(--mono); font-size: 11.5px; line-height: 1.7;
  max-height: 220px; overflow-y: auto;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--r-ctl);
  padding: 8px 10px;
  white-space: pre-wrap; word-break: break-all;
  box-shadow: var(--shadow-well);
}
.log:empty::before { content: "—"; color: var(--text-faint); }
.log .t-dim  { color: var(--text-faint); }
.log .t-tx   { color: var(--text-dim); }
.log .t-rx   { color: var(--rx); }
.log .t-ok   { color: var(--ok); }
.log .t-err  { color: var(--err); }

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

footer {
  max-width: 1240px;
  margin: 8px auto 40px;
  padding: 0 24px;
  font-size: 12px;
  color: var(--text-faint);
}
footer p { margin: 4px 0; }
footer a { color: var(--text-dim); text-decoration: none; border-bottom: 1px solid var(--border-2); }
footer a:hover { color: var(--text); }
.coauthor { letter-spacing: 0.01em; }

/* ---------- connect-guidance modal (tinted glass) ---------- */

.modal {
  border: none;
  padding: 0;
  background: transparent;
  max-width: min(460px, calc(100vw - 32px));
  color: var(--text);
}
.modal::backdrop {
  background: rgba(4, 5, 7, 0.55);
  backdrop-filter: blur(4px) saturate(120%);
  -webkit-backdrop-filter: blur(4px) saturate(120%);
}
.modal[open] { animation: modal-in 160ms ease-out; }
@keyframes modal-in {
  from { opacity: 0; transform: translateY(10px) scale(0.98); }
  to   { opacity: 1; transform: none; }
}

.modal-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  border-radius: var(--r-card);
  padding: 22px 24px 18px;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.6), var(--shadow-inset-hi);
}

.modal-card h2 {
  margin: 0 0 6px;
  font-size: 16px; font-weight: 600; letter-spacing: -0.01em;
}
.modal-intro {
  margin: 0 0 16px;
  font-size: 12.5px; color: var(--text-dim); line-height: 1.5;
}

.checklist {
  list-style: none;
  margin: 0 0 16px; padding: 0;
  display: flex; flex-direction: column; gap: 10px;
}
.checklist li {
  display: flex; gap: 11px; align-items: flex-start;
  font-size: 13px; line-height: 1.45; color: var(--text-dim);
}
.checklist li strong { color: var(--text); font-weight: 600; }
.check-num {
  flex: none;
  width: 20px; height: 20px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: #1d1710;
  border: 1px solid var(--accent-dim);
  color: var(--accent);
  font-family: var(--mono); font-size: 11px; font-weight: 600;
  margin-top: 1px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.modal-remember {
  display: flex; align-items: center; gap: 7px;
  font-size: 12px; color: var(--text-faint);
  cursor: pointer; user-select: none;
  margin-bottom: 16px;
}
.modal-remember input { accent-color: var(--accent); }

.modal-actions {
  display: flex; justify-content: flex-end; gap: 10px;
}

/* ---------- responsive ---------- */

/* tablet: single column, bands reflow to a 5-across grid */
@media (max-width: 980px) {
  .layout { grid-template-columns: 1fr; }
  .bands { grid-template-columns: repeat(5, 1fr); row-gap: 18px; }
  .topbar { height: auto; padding: 10px 16px; flex-wrap: wrap; }
  .topbar-right { flex-wrap: wrap; justify-content: flex-end; }
  .all-devices span { display: none; }
}

/* phone: the 10 bands become a swipeable strip of vertical sliders */
@media (max-width: 700px) {
  .bands {
    display: flex;
    gap: 6px;
    overflow-x: auto;
    overflow-y: hidden;
    scroll-snap-type: x proximity;
    -webkit-overflow-scrolling: touch;
    touch-action: pan-x;
    padding: 16px 14px 12px;
    scrollbar-width: thin;
    scrollbar-color: var(--border-2) transparent;
  }
  .band { flex: 0 0 62px; scroll-snap-align: center; }
  /* dragging a thumb adjusts it — it must never pan the strip; swiping the
     gaps between bands still scrolls */
  input[type="range"].band-slider { height: 150px; touch-action: none; }
  .bands::-webkit-scrollbar { height: 6px; }
  .bands::-webkit-scrollbar-track { background: transparent; }
  .bands::-webkit-scrollbar-thumb { background: var(--border-2); border-radius: 3px; }

  /* directional edge fades, present only while content overflows that way
     (JS toggles .can-scroll-left / .can-scroll-right on the wrapper) */
  .bands-wrap.can-scroll-right::after,
  .bands-wrap.can-scroll-left::before {
    content: ""; position: absolute; top: 1px; bottom: 7px; width: 44px;
    pointer-events: none; z-index: 2;
  }
  .bands-wrap.can-scroll-right::after {
    right: 1px; border-radius: 0 var(--r-card) var(--r-card) 0;
    background: linear-gradient(to right, rgba(25, 28, 33, 0), rgba(25, 28, 33, 0.92));
  }
  .bands-wrap.can-scroll-left::before {
    left: 1px; border-radius: var(--r-card) 0 0 var(--r-card);
    background: linear-gradient(to left, rgba(25, 28, 33, 0), rgba(25, 28, 33, 0.92));
  }
}

/* small-phone pass */
@media (max-width: 600px) {
  .layout { padding: 0 14px; gap: 14px; margin: 16px auto; }
  .topbar { padding: 10px 14px; }
  .brand-text span { display: none; }
  .device-pill { max-width: 130px; }
  #curve { height: 200px; }
  .transport .btn { flex: 1 1 45%; }        /* Read / Preview / Save / Flat → 2×2 */
  .seg { width: 100%; }
  .import-row { flex-wrap: wrap; }
  .import-row .btn, .import-row .file-btn { flex: 1 1 auto; }
}

/* finger-sized targets on touch devices */
@media (pointer: coarse) {
  input[type="range"].band-slider { width: 28px; }
  input[type="range"].band-slider::-webkit-slider-runnable-track { width: 6px; }
  input[type="range"].band-slider::-webkit-slider-thumb {
    width: 22px; height: 22px; margin-left: -8px;
  }
  .btn { padding: 10px 16px; font-size: 13.5px; }
  .chip { padding: 8px 14px; }
  .seg-btn { padding: 9px 14px; }
  .band-q { width: 52px; padding: 5px; font-size: 12px; }
}