/* ============================================================
   Vectorlab — precision dark studio theme
   Palette: deep slate + indigo/violet accents
   Type: Sora (display) · Plus Jakarta Sans (body) · JetBrains Mono (numerics)
   ============================================================ */

:root {
  --bg:        #0a0c12;
  --bg-2:      #0e1119;
  --surface:   #12151f;
  --surface-2: #171b27;
  --line:      #232838;
  --line-soft: #1b1f2c;

  --text:      #e7eaf3;
  --text-dim:  #9aa3b8;
  --text-mute: #5e6680;

  --accent:    #6366f1;
  --accent-2:  #818cf8;
  --accent-3:  #a78bfa;
  --accent-ink:#c7d0ff;
  --glow:      rgba(99, 102, 241, .55);

  --danger:    #f4708c;
  --ok:        #4ade80;

  --radius:    14px;
  --radius-sm: 10px;
  --shadow:    0 18px 50px -18px rgba(0,0,0,.7);

  --font-display: "Sora", sans-serif;
  --font-body: "Plus Jakarta Sans", sans-serif;
  --font-mono: "JetBrains Mono", monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body { height: 100%; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  position: relative;
}

[hidden] { display: none !important; }

/* --- atmospheric background --- */
.bg-grid {
  position: fixed; inset: 0; z-index: -2;
  background-image:
    linear-gradient(to right, var(--line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-soft) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 30%, transparent 80%);
  opacity: .6;
}
.bg-glow {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(60% 50% at 15% -5%, rgba(99,102,241,.18), transparent 60%),
    radial-gradient(50% 45% at 95% 10%, rgba(167,139,250,.13), transparent 60%);
}

/* ============ TOPBAR ============ */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 30px;
  border-bottom: 1px solid var(--line-soft);
  backdrop-filter: blur(8px);
}
.brand { display: flex; align-items: center; gap: 13px; }
.brand-mark {
  font-size: 26px; line-height: 1;
  color: var(--accent-2);
  filter: drop-shadow(0 0 12px var(--glow));
  animation: pulse 4s ease-in-out infinite;
}
@keyframes pulse { 50% { opacity: .7; transform: rotate(45deg) scale(.95); } }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name {
  font-family: var(--font-display); font-weight: 800; font-size: 19px;
  letter-spacing: -.02em;
}
.brand-tag {
  font-size: 11px; color: var(--text-mute);
  text-transform: uppercase; letter-spacing: .22em;
}
.pill {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12px; color: var(--text-dim);
  padding: 7px 14px; border: 1px solid var(--line);
  border-radius: 999px; background: var(--surface);
  font-family: var(--font-mono);
}
.pill .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--ok); box-shadow: 0 0 10px var(--ok);
}

/* ============ LAYOUT ============ */
.layout {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 24px;
  padding: 24px 30px 30px;
  max-width: 1600px; margin: 0 auto;
  align-items: start;
}

/* ============ SIDEBAR ============ */
.sidebar {
  position: sticky; top: 24px;
  display: flex; flex-direction: column;
}
#controls { display: flex; flex-direction: column; gap: 18px; }

.panel {
  background: linear-gradient(180deg, var(--surface), var(--bg-2));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}
.panel-title {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-display); font-weight: 600; font-size: 13px;
  text-transform: uppercase; letter-spacing: .14em;
  color: var(--text-dim);
  margin-bottom: 18px;
}
.panel-title .idx {
  font-family: var(--font-mono); font-size: 11px;
  color: var(--accent-2);
  border: 1px solid var(--line);
  background: var(--bg);
  padding: 3px 7px; border-radius: 6px;
}

/* --- dropzone --- */
.dropzone {
  display: block; cursor: pointer;
  border: 1.5px dashed var(--line);
  border-radius: var(--radius-sm);
  background:
    radial-gradient(120% 100% at 50% 0%, rgba(99,102,241,.06), transparent 70%),
    var(--bg);
  padding: 26px 18px;
  text-align: center;
  transition: border-color .2s, background .2s, transform .2s;
  outline: none;
}
.dropzone:hover, .dropzone:focus-visible { border-color: var(--accent); }
.dropzone.dragover {
  border-color: var(--accent-2);
  background: radial-gradient(120% 100% at 50% 0%, rgba(99,102,241,.22), transparent 70%), var(--bg);
  transform: scale(1.01);
  box-shadow: 0 0 0 4px rgba(99,102,241,.12), inset 0 0 30px rgba(99,102,241,.1);
}
.dz-icon {
  width: 46px; height: 46px; margin: 0 auto 12px;
  display: grid; place-items: center;
  color: var(--accent-2);
  border: 1px solid var(--line);
  border-radius: 12px; background: var(--surface);
}
.dz-icon svg { width: 22px; height: 22px; }
.dz-headline { font-weight: 600; font-size: 14px; }
.dz-sub { font-size: 12.5px; color: var(--text-mute); margin-top: 4px; }
.dz-link { color: var(--accent-2); font-weight: 600; }

.dz-loaded { display: flex; align-items: center; gap: 12px; text-align: left; }
.dz-thumb {
  width: 54px; height: 54px; border-radius: 9px; object-fit: cover;
  border: 1px solid var(--line); background: var(--bg);
  flex-shrink: 0;
}
.dz-info { display: flex; flex-direction: column; min-width: 0; flex: 1; }
.file-name {
  font-weight: 600; font-size: 13px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.file-size { font-family: var(--font-mono); font-size: 11px; color: var(--text-mute); }
.dz-clear {
  flex-shrink: 0;
  width: 26px; height: 26px; border-radius: 7px;
  background: var(--surface-2); border: 1px solid var(--line);
  color: var(--text-dim); cursor: pointer; font-size: 12px;
  transition: .15s;
}
.dz-clear:hover { color: var(--danger); border-color: var(--danger); }

/* --- fields --- */
.field { margin-bottom: 16px; }
.field:last-child { margin-bottom: 0; }
.field > label {
  display: block; font-size: 12.5px; font-weight: 600;
  color: var(--text-dim); margin-bottom: 8px;
}

/* --- label + info-tip row --- */
.field-head {
  display: flex; align-items: center; gap: 5px;
  margin-bottom: 8px;
}
.field-head label {
  display: block; font-size: 12.5px; font-weight: 600;
  color: var(--text-dim); margin-bottom: 0;
}
.slider-head .field-head { margin-bottom: 0; }

/* --- info tip button --- */
.info-tip {
  position: relative;
  display: inline-flex; align-items: center; justify-content: center;
  width: 14px; height: 14px; flex-shrink: 0;
  background: none; border: 1px solid var(--line); border-radius: 50%;
  color: var(--text-mute);
  font-size: 9px; font-style: italic; font-family: serif;
  cursor: pointer; padding: 0; line-height: 1;
  transition: color .15s, border-color .15s;
}
.info-tip:hover, .info-tip:focus-visible {
  color: var(--accent-ink); border-color: var(--accent); outline: none;
}

/* --- tooltip box --- */
.tip-box {
  display: none;
  position: absolute;
  left: 50%; bottom: calc(100% + 8px);
  transform: translateX(-50%);
  width: 230px;
  background: var(--surface-2); border: 1px solid var(--line);
  border-radius: var(--radius-sm); padding: 10px 12px;
  font-size: 11.5px; line-height: 1.55; color: var(--text);
  font-style: normal; font-family: var(--font-body);
  font-weight: 400;
  box-shadow: var(--shadow);
  z-index: 100; pointer-events: none;
  white-space: normal; text-align: left;
}
.tip-box::after {
  content: "";
  position: absolute; top: 100%; left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: var(--line);
}
.info-tip:hover .tip-box,
.info-tip:focus-visible .tip-box { display: block; }

.select-wrap { position: relative; }
.select-wrap::after {
  content: "▾"; position: absolute; right: 13px; top: 50%;
  transform: translateY(-50%); color: var(--text-mute);
  pointer-events: none; font-size: 11px;
}
select {
  width: 100%; appearance: none;
  font-family: var(--font-body); font-size: 13.5px; font-weight: 500;
  color: var(--text);
  background: var(--bg); border: 1px solid var(--line);
  border-radius: var(--radius-sm); padding: 11px 34px 11px 13px;
  cursor: pointer; transition: border-color .15s, box-shadow .15s;
}
select:hover { border-color: var(--line); }
select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(99,102,241,.15); }

/* --- sliders --- */
.slider-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 10px; }
.slider-head label { font-size: 12.5px; font-weight: 600; color: var(--text-dim); }
.value {
  font-family: var(--font-mono); font-weight: 600; font-size: 13px;
  color: var(--accent-ink);
  background: rgba(99,102,241,.1); border: 1px solid rgba(99,102,241,.25);
  padding: 2px 9px; border-radius: 7px; min-width: 34px; text-align: center;
}
input[type="range"] {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 5px; border-radius: 99px;
  background: var(--surface-2); cursor: pointer; outline: none;
}
input[type="range"]::-webkit-slider-runnable-track { height: 5px; border-radius: 99px; }
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 17px; height: 17px; margin-top: -6px; border-radius: 50%;
  background: var(--accent-2); border: 3px solid var(--bg);
  box-shadow: 0 0 0 1px var(--accent), 0 0 12px var(--glow);
  transition: transform .12s;
}
input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.15); }
input[type="range"]::-moz-range-thumb {
  width: 15px; height: 15px; border-radius: 50%;
  background: var(--accent-2); border: 3px solid var(--bg);
  box-shadow: 0 0 0 1px var(--accent), 0 0 12px var(--glow);
}
input[type="range"]::-moz-range-track { height: 5px; border-radius: 99px; background: var(--surface-2); }
.scale {
  display: flex; justify-content: space-between;
  font-size: 10.5px; color: var(--text-mute); margin-top: 7px;
  text-transform: uppercase; letter-spacing: .08em;
}

/* --- primary button --- */
.btn-primary {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  width: 100%; padding: 15px;
  font-family: var(--font-display); font-weight: 700; font-size: 14px;
  color: #fff; cursor: pointer;
  border: none; border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  box-shadow: 0 10px 30px -10px var(--glow), inset 0 1px 0 rgba(255,255,255,.2);
  transition: transform .12s, box-shadow .2s, filter .2s;
}
.btn-primary .btn-arrow { width: 18px; height: 18px; transition: transform .2s; }
.btn-primary:hover:not(:disabled) { transform: translateY(-2px); box-shadow: 0 16px 38px -10px var(--glow); }
.btn-primary:hover:not(:disabled) .btn-arrow { transform: translateX(4px); }
.btn-primary:active:not(:disabled) { transform: translateY(0); }
.btn-primary:disabled { opacity: .4; cursor: not-allowed; filter: grayscale(.4); }
.btn-primary.loading { pointer-events: none; opacity: .8; }

.error-msg {
  font-size: 12.5px; color: var(--danger);
  background: rgba(244,112,140,.08); border: 1px solid rgba(244,112,140,.3);
  padding: 10px 13px; border-radius: var(--radius-sm);
  line-height: 1.4;
}

/* ============ STAGE ============ */
.stage {
  background: linear-gradient(180deg, var(--surface), var(--bg-2));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  display: flex; flex-direction: column;
  min-height: calc(100vh - 140px);
}
.stage-toolbar {
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
  background: var(--bg-2);
}
.seg-label {
  font-family: var(--font-display); font-weight: 600; font-size: 12px;
  text-transform: uppercase; letter-spacing: .16em; color: var(--text-dim);
}

.zoom {
  display: flex; align-items: center; gap: 4px;
  background: var(--bg); border: 1px solid var(--line);
  border-radius: 9px; padding: 4px;
}
.zoom button {
  width: 28px; height: 26px; border: none; cursor: pointer;
  background: transparent; color: var(--text-dim);
  font-size: 16px; border-radius: 6px; transition: .15s;
}
.zoom button:hover { background: var(--surface-2); color: var(--text); }
.zoom-level {
  font-family: var(--font-mono); font-size: 11.5px; color: var(--text-dim);
  min-width: 44px; text-align: center;
}
.zoom-reset { font-size: 11px !important; font-weight: 600; width: auto !important; padding: 0 9px; color: var(--accent-2) !important; }

.btn-download {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 600; text-decoration: none;
  color: var(--accent-ink);
  background: rgba(99,102,241,.1);
  border: 1px solid rgba(99,102,241,.35);
  padding: 9px 16px; border-radius: 9px;
  transition: .18s; cursor: pointer;
}
.btn-download svg { width: 16px; height: 16px; }
.btn-download:hover { background: rgba(99,102,241,.2); border-color: var(--accent); }
.btn-download.disabled { opacity: .35; pointer-events: none; filter: grayscale(.5); }

/* --- compare panes --- */
.compare {
  flex: 1; display: grid; grid-template-columns: 1fr 1fr;
  gap: 1px; background: var(--line);
}
.pane { position: relative; display: flex; flex-direction: column; background: var(--bg); min-height: 0; }
.pane-tag {
  position: absolute; top: 12px; left: 12px; z-index: 3;
  font-family: var(--font-mono); font-size: 10.5px; font-weight: 600;
  text-transform: uppercase; letter-spacing: .1em;
  color: var(--text-dim);
  background: rgba(10,12,18,.78); backdrop-filter: blur(6px);
  border: 1px solid var(--line);
  padding: 5px 10px; border-radius: 7px;
}
.pane-tag.accent { color: var(--accent-ink); border-color: rgba(99,102,241,.4); }

.pane-canvas {
  flex: 1; position: relative; overflow: auto;
  display: grid; place-items: center; padding: 32px;
}
.checker {
  --c: #161922;
  background-color: var(--bg);
  background-image:
    linear-gradient(45deg, var(--c) 25%, transparent 25%),
    linear-gradient(-45deg, var(--c) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--c) 75%),
    linear-gradient(-45deg, transparent 75%, var(--c) 75%);
  background-size: 22px 22px;
  background-position: 0 0, 0 11px, 11px -11px, -11px 0;
}
.orig-view, .svg-view {
  max-width: 100%; max-height: 100%;
  transform-origin: center center;
  transition: transform .15s ease-out;
}
.orig-view { display: block; border-radius: 4px; box-shadow: 0 8px 30px -8px rgba(0,0,0,.6); }
.svg-view { display: grid; place-items: center; }
.svg-view svg { max-width: 100%; height: auto; display: block; filter: drop-shadow(0 8px 30px rgba(0,0,0,.5)); }

.placeholder {
  display: flex; flex-direction: column; align-items: center; gap: 14px;
  color: var(--text-mute); text-align: center; padding: 20px;
}
.ph-glyph { font-size: 40px; opacity: .35; }
.placeholder p { font-size: 13px; max-width: 200px; line-height: 1.5; }

/* --- loading overlay --- */
.overlay {
  position: absolute; inset: 0; z-index: 5;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 18px;
  background: rgba(8,10,15,.78); backdrop-filter: blur(4px);
}
.overlay[hidden] { display: none; }
.overlay-text { font-family: var(--font-mono); font-size: 12.5px; color: var(--accent-ink); letter-spacing: .04em; transition: opacity .4s; }
.overlay-elapsed {
  font-family: var(--font-mono); font-size: 11px; color: var(--text-mute);
  letter-spacing: .06em; margin-top: 2px;
}
.overlay-hint {
  font-size: 11.5px; color: var(--text-mute); text-align: center;
  max-width: 220px; line-height: 1.5; min-height: 1.5em;
  transition: opacity .5s;
}
.spinner { display: flex; gap: 7px; }
.spinner span {
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--accent-2);
  animation: bounce 1.2s ease-in-out infinite;
}
.spinner span:nth-child(2) { animation-delay: .15s; background: var(--accent-3); }
.spinner span:nth-child(3) { animation-delay: .3s; background: var(--accent); }
@keyframes bounce {
  0%, 80%, 100% { transform: translateY(0); opacity: .5; }
  40% { transform: translateY(-12px); opacity: 1; }
}

.stage-foot {
  padding: 11px 18px; border-top: 1px solid var(--line);
  background: var(--bg-2);
}
.stat { font-family: var(--font-mono); font-size: 11.5px; color: var(--text-mute); }
.stat.done { color: var(--ok); }

/* ============ RESPONSIVE ============ */
@media (max-width: 1080px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .stage { min-height: 70vh; }
}
@media (max-width: 680px) {
  .topbar { padding: 14px 18px; }
  .topbar-meta { display: none; }
  .layout { padding: 16px; gap: 16px; }
  .compare { grid-template-columns: 1fr; }
  .pane-canvas { min-height: 320px; }
  .stage-toolbar { flex-wrap: wrap; }
}

/* --- overlay refresh button --- */
.overlay-refresh {
  display: inline-flex; align-items: center; gap: 7px;
  font-family: var(--font-mono); font-size: 11.5px; font-weight: 600;
  color: var(--text-dim);
  background: var(--surface-2); border: 1px solid var(--line);
  padding: 8px 16px; border-radius: 9px;
  cursor: pointer; transition: color .15s, border-color .15s, background .15s;
  margin-top: 6px;
}
.overlay-refresh svg { width: 13px; height: 13px; }
.overlay-refresh:hover {
  color: var(--accent-ink); border-color: rgba(99,102,241,.5);
  background: rgba(99,102,241,.1);
}

/* --- SVG reveal animation --- */
@keyframes svgReveal {
  from { opacity: 0; transform: scale(0.96); }
  to   { opacity: 1; transform: scale(1); }
}
.svg-view.ready {
  animation: svgReveal 0.45s cubic-bezier(0.22, 1, 0.36, 1) both;
}

/* --- comparison-ready state for the SVG pane-tag --- */
.pane-tag.result-ready {
  color: var(--ok);
  border-color: rgba(74, 222, 128, 0.4);
  background: rgba(74, 222, 128, 0.06);
}
.pane-tag.result-ready::before {
  content: "✓ ";
}

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