/* ── RESET & BASE ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:       #0e0f11;
  --bg2:      #15171a;
  --bg3:      #1c1f23;
  --border:   rgba(255,255,255,0.07);
  --border2:  rgba(255,255,255,0.13);
  --text:     #e8e9eb;
  --text2:    #7c8087;
  --text3:    #4a4e55;
  --accent:   #378ADD;
  --green:    #1D9E75;
  --coral:    #D85A30;
  --purple:   #7F77DD;
  --amber:    #BA7517;
  --font-sans: 'DM Sans', sans-serif;
  --font-mono: 'DM Mono', monospace;
  --radius:   10px;
  --radius-lg: 14px;
}

html { font-size: 15px; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

/* ── HEADER ── */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(14,15,17,0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.logo-mark {
  width: 28px;
  height: 28px;
  background: var(--accent);
  color: #fff;
  font-weight: 500;
  font-size: 14px;
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
}

.logo-text {
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.logo-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text3);
  border: 1px solid var(--border2);
  padding: 2px 7px;
  border-radius: 20px;
}

/* ── NAV ── */
.nav {
  display: flex;
  gap: 2px;
}

.nav-btn {
  padding: 5px 14px;
  font-size: 13px;
  font-family: var(--font-sans);
  color: var(--text2);
  background: none;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: color .15s, background .15s;
}

.nav-btn:hover { color: var(--text); background: var(--bg3); }
.nav-btn.active { color: var(--text); background: var(--bg3); font-weight: 500; }

/* ── MAIN ── */
.main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* ── TABS ── */
.tab-section { display: none; }
.tab-section.active { display: block; }

/* ── TOOLBAR ── */
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 1.5rem;
}

.toolbar-hint {
  font-size: 13px;
  color: var(--text2);
  max-width: 480px;
}

.preset-group {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.preset-label {
  font-size: 12px;
  color: var(--text3);
  font-family: var(--font-mono);
}

.preset-btn {
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--text2);
  background: var(--bg3);
  border: 1px solid var(--border2);
  padding: 4px 12px;
  border-radius: 6px;
  cursor: pointer;
  transition: color .15s, border-color .15s, background .15s;
}

.preset-btn:hover {
  color: var(--text);
  border-color: var(--accent);
  background: rgba(55,138,221,0.08);
}

/* ── INPUT GRID ── */
.input-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}

/* ── CARD ── */
.card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
}

.card-header {
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--text2);
  text-transform: uppercase;
  letter-spacing: .06em;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ── INPUTS ── */
.input-group {
  margin-bottom: .75rem;
}

.input-group:last-child { margin-bottom: 0; }

.input-group label {
  display: block;
  font-size: 12px;
  color: var(--text2);
  margin-bottom: 4px;
}

.unit {
  color: var(--text3);
  font-size: 11px;
}

.input-group input[type="number"] {
  width: 100%;
  background: var(--bg3);
  border: 1px solid var(--border2);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 14px;
  padding: 7px 10px;
  outline: none;
  transition: border-color .15s;
  -moz-appearance: textfield;
}

.input-group input[type="number"]::-webkit-outer-spin-button,
.input-group input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; }

.input-group input[type="number"]:focus {
  border-color: var(--accent);
}

/* ── SLIDERS ── */
.slider-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.slider-row input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  height: 3px;
  background: var(--bg3);
  border-radius: 3px;
  outline: none;
  cursor: pointer;
}

.slider-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid var(--bg2);
}

output {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text2);
  min-width: 32px;
  text-align: right;
}

/* ── RESULTS ── */
.results-block {
  margin-bottom: 2rem;
}

.results-title {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text3);
  margin-bottom: .75rem;
}

.metrics-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px;
}

.metric {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: .875rem 1rem;
}

.metric .m-val {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 500;
  line-height: 1.2;
}

.metric .m-lbl {
  font-size: 11px;
  color: var(--text2);
  margin-top: 3px;
}

.metric.ok   .m-val { color: var(--green);  }
.metric.warn .m-val { color: var(--amber);  }
.metric.bad  .m-val { color: var(--coral);  }

/* ── CHARTS ── */
.charts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
}

.chart-card canvas {
  width: 100% !important;
  height: 200px !important;
  display: block;
  margin-top: .75rem;
}

.chart-hint {
  font-size: 11px;
  color: var(--text3);
  margin-top: .5rem;
  font-family: var(--font-mono);
}

/* ── FRONT VIEW ── */
.visual-card {}

.visual-card canvas {
  display: block;
  width: 100%;
  max-width: 780px;
  margin: .75rem auto 0;
  border-radius: 8px;
  background: var(--bg3);
}

.travel-control {
  max-width: 780px;
  margin: 1rem auto 0;
}

.travel-control label {
  display: block;
  font-size: 12px;
  color: var(--text2);
  margin-bottom: 4px;
}

.travel-control input[type="range"] {
  width: 100%;
  -webkit-appearance: none;
  height: 3px;
  background: var(--bg3);
  border-radius: 3px;
  outline: none;
  cursor: pointer;
}

.travel-control input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--purple);
  cursor: pointer;
  border: 2px solid var(--bg2);
}

.visual-legend {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
  max-width: 780px;
  margin: .75rem auto 0;
  font-size: 12px;
  color: var(--text2);
}

.visual-legend span {
  display: flex;
  align-items: center;
  gap: 6px;
}

.dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ── RESPONSIVE ── */
@media (max-width: 600px) {
  .header-inner { padding: 0 1rem; }
  .main { padding: 1.25rem 1rem; }
  .nav-btn { padding: 5px 10px; font-size: 12px; }
  .logo-badge { display: none; }
}

/* ── ANTI-GEOMETRY TAB ── */
.anti-layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 780px) {
  .anti-layout { grid-template-columns: 1fr; }
}

.anti-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.anti-metric {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: .875rem 1rem;
  text-align: center;
}

.anti-metric .am-val {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 500;
  line-height: 1.1;
}

.anti-metric .am-lbl {
  font-size: 11px;
  color: var(--text2);
  margin-top: 4px;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: .04em;
}

.anti-metric .am-sub {
  font-size: 10px;
  color: var(--text3);
  margin-top: 2px;
}

.anti-metric.target-ok   .am-val { color: var(--green); }
.anti-metric.target-warn .am-val { color: var(--amber); }
.anti-metric.target-bad  .am-val { color: var(--coral); }

#sideView {
  display: block;
  width: 100%;
  background: var(--bg3);
  border-radius: 8px;
  margin-top: .5rem;
}

.explainer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .75rem;
  margin-top: .75rem;
}

.explainer-item {
  background: var(--bg3);
  border-radius: var(--radius);
  padding: .75rem;
}

.explainer-item .ei-title {
  font-size: 12px;
  font-weight: 500;
  font-family: var(--font-mono);
  margin-bottom: 4px;
}

.explainer-item .ei-body {
  font-size: 12px;
  color: var(--text2);
  line-height: 1.55;
}

@media (max-width: 500px) {
  .explainer-grid { grid-template-columns: 1fr; }
}

/* ── SPRING / DAMPER TAB ── */
.sd-hero {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
}

.sd-hero-inner {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.sd-hero-block {
  text-align: center;
}

.sd-big {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 500;
  line-height: 1.1;
  color: var(--text);
}

.val-green { color: var(--green) !important; }
.val-amber { color: var(--amber) !important; }
.val-coral { color: var(--coral) !important; }

.sd-big-lbl {
  font-size: 11px;
  color: var(--text2);
  margin-top: 4px;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: .04em;
}

.sd-tag {
  font-size: 10px;
  color: var(--text3);
  margin-top: 3px;
  font-family: var(--font-mono);
}

/* damper bar chart */
.damper-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.damper-vel {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text2);
  min-width: 55px;
  text-align: right;
}

.damper-bar-wrap {
  flex: 1;
  height: 6px;
  background: var(--bg3);
  border-radius: 3px;
  overflow: hidden;
}

.damper-bar {
  height: 100%;
  background: var(--purple);
  border-radius: 3px;
  transition: width .3s ease;
}

.damper-force {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text);
  min-width: 55px;
}

#freqChart {
  width: 100% !important;
  height: 220px !important;
  display: block;
  margin-top: .75rem;
}

@media (max-width: 600px) {
  .sd-hero-inner { grid-template-columns: 1fr; }
}

/* ── EXPORT BUTTON ── */
.export-btn {
  font-size: 12px;
  font-family: var(--font-mono);
  font-weight: 500;
  color: #fff;
  background: var(--accent);
  border: none;
  padding: 7px 14px;
  border-radius: 7px;
  cursor: pointer;
  flex-shrink: 0;
  transition: opacity .15s, transform .1s;
}

.export-btn:hover   { opacity: .85; }
.export-btn:active  { transform: scale(.97); }
.export-btn:disabled { opacity: .5; cursor: not-allowed; }