/* ============================================================================
   NTBuilder — Web stylesheet
   Visual identity aligned with the NanoEng group site (nanoeng.unb.br).
   Light theme is the default; a dark variant is available via data-theme.
   ============================================================================ */

/* ----- Design tokens (light, default) --------------------------------------- */
:root,
[data-theme="light"] {
  /* Brand palette (mirrors nanoeng/site/assets/css/style.css) */
  --c-primary:        #0A2540;
  --c-primary-2:      #0B3D6E;
  --c-brand:          #0066CC;
  --c-brand-light:    #2E86E0;
  --c-cyan:           #06B6D4;
  --c-emerald:        #10B981;

  /* Neutrals */
  --c-text:           #0F172A;
  --c-text-2:         #334155;
  --c-muted:          #64748B;
  --c-border:         #E2E8F0;
  --c-border-strong:  #CBD5E1;
  --c-bg:             #FFFFFF;
  --c-bg-soft:        #F8FAFC;
  --c-bg-alt:         #F1F5F9;
  --c-bg-dark:        #0A2540;
  --c-bg-darker:      #061A2B;

  /* Status colors */
  --c-warning:        #D97706;
  --c-warning-bg:     rgba(217, 119, 6, .10);
  --c-warning-border: rgba(217, 119, 6, .30);
  --c-success:        #047857;
  --c-success-bg:     rgba(16, 185, 129, .12);
  --c-danger:         #DC2626;
  --c-danger-bg:      rgba(220, 38, 38, .10);
  --c-info-bg:        rgba(6, 182, 212, .12);

  /* Gradients */
  --grad-brand: linear-gradient(135deg, #0066CC 0%, #06B6D4 55%, #10B981 100%);
  --grad-hero:  linear-gradient(135deg, #0A2540 0%, #0B3D6E 60%, #0A4A6E 100%);
  --grad-soft:  linear-gradient(135deg, rgba(0,102,204,.06), rgba(16,185,129,.08));

  /* Typography */
  --ff-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --ff-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  /* Sizing & radius */
  --radius-sm: 6px;
  --radius:    10px;
  --radius-lg: 16px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, .06);
  --shadow:    0 4px 16px rgba(15, 23, 42, .08);
  --shadow-lg: 0 12px 40px rgba(15, 23, 42, .12);
  --shadow-modal: 0 24px 60px rgba(10, 37, 64, .35);

  /* Motion */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);

  /* App-layout-specific */
  --header-height: 60px;
  --footer-height: 44px;
  --sidebar-width: 300px;
  --polar-width:   460px;

  /* Plot / viewer */
  --plot-bg:   transparent;
  --plot-grid: #E2E8F0;
  --plot-text: #64748B;
  --viewer-bg: #F8FAFC;
}

/* ----- Dark theme tokens (toggle) ------------------------------------------ */
[data-theme="dark"] {
  --c-primary:        #66B0FF;
  --c-primary-2:      #2E86E0;
  --c-brand:          #4F8EF7;
  --c-brand-light:    #6FA8FF;
  --c-cyan:           #67E8F9;
  --c-emerald:        #34D399;

  --c-text:           #E2E8F0;
  --c-text-2:         #CBD5E1;
  --c-muted:          #94A3B8;
  --c-border:         #1F2A44;
  --c-border-strong:  #2A3858;
  --c-bg:             #0A1220;
  --c-bg-soft:        #0F1A2E;
  --c-bg-alt:         #142039;
  --c-bg-dark:        #061327;
  --c-bg-darker:      #03091A;

  --c-warning:        #FBBF24;
  --c-warning-bg:     rgba(251, 191, 36, .10);
  --c-warning-border: rgba(251, 191, 36, .30);
  --c-success:        #34D399;
  --c-success-bg:     rgba(52, 211, 153, .12);
  --c-danger:         #F87171;
  --c-danger-bg:      rgba(248, 113, 113, .10);
  --c-info-bg:        rgba(103, 232, 249, .10);

  --grad-soft:  linear-gradient(135deg, rgba(79,142,247,.10), rgba(52,211,153,.10));

  --shadow:        0 4px 24px rgba(0, 0, 0, .45);
  --shadow-lg:     0 12px 40px rgba(0, 0, 0, .55);
  --shadow-modal:  0 24px 60px rgba(0, 0, 0, .70);

  --plot-grid: #1F2A44;
  --plot-text: #94A3B8;
  --viewer-bg: #060B17;
}

/* ----- Reset ---------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 14px; height: 100%; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--ff-sans);
  font-size: 14px;
  line-height: 1.55;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

img, svg { display: block; max-width: 100%; height: auto; }

a {
  color: var(--c-brand);
  text-decoration: none;
  transition: color .2s var(--ease);
}
a:hover { color: var(--c-cyan); }

code, pre, kbd, samp { font-family: var(--ff-mono); }

/* ----- Site header (NanoEng-style) ----------------------------------------- */
.site-header {
  position: relative;
  z-index: 200;
  background: rgba(255, 255, 255, .94);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--c-border);
  flex-shrink: 0;
}
[data-theme="dark"] .site-header {
  background: rgba(10, 18, 32, .92);
}
.site-header__inner {
  height: var(--header-height);
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 0 22px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex-shrink: 0;
  color: var(--c-text);
}
.brand__logo {
  height: 30px;
  width: auto;
}
.brand__title {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}
.brand__name {
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.brand__sub {
  font-size: .72rem;
  font-weight: 500;
  color: var(--c-muted);
  letter-spacing: 0.02em;
}

.nav {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: 12px;
}
.nav a {
  display: inline-block;
  padding: 7px 12px;
  font-size: .85rem;
  font-weight: 500;
  color: var(--c-text-2);
  border-radius: 8px;
  transition: color .2s var(--ease), background .2s var(--ease);
}
.nav a:hover { color: var(--c-brand); background: var(--c-bg-soft); }
.nav a.active {
  color: var(--c-brand);
  background: rgba(0, 102, 204, .07);
}

.site-header__spacer { flex: 1; }

.site-header__tools {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-icon {
  background: var(--c-bg-soft);
  color: var(--c-text-2);
  border: 1px solid var(--c-border);
  padding: 6px 10px;
  font-size: .82rem;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
  transition: all .15s var(--ease);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* Language toggle (NanoEng-style) */
.lang-toggle {
  display: inline-flex;
  border: 1px solid var(--c-border);
  border-radius: 999px;
  overflow: hidden;
  background: var(--c-bg);
}
.lang-toggle button {
  background: none;
  border: 0;
  padding: 5px 10px;
  font-size: .74rem;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--c-muted);
  cursor: pointer;
  transition: all .2s var(--ease);
}
.lang-toggle button.active {
  background: var(--grad-brand);
  color: #FFFFFF;
}
.btn-icon:hover {
  color: var(--c-brand);
  border-color: var(--c-brand);
  background: var(--c-bg);
}
.btn-icon:disabled { opacity: .45; cursor: not-allowed; }

.brand__unb { height: 28px; width: auto; opacity: .85; }
[data-theme="dark"] .brand__unb { filter: brightness(0) invert(1); opacity: .8; }

/* ----- App shell (3-column main work area) --------------------------------- */
#main {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: var(--sidebar-width) var(--polar-width) 1fr;
  background: var(--c-bg);
  overflow: hidden;
}

/* ----- Sidebar -------------------------------------------------------------- */
#sidebar {
  background: var(--c-bg-soft);
  border-right: 1px solid var(--c-border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  padding: 16px 14px 18px;
  gap: 14px;
}

/* ----- Polar column -------------------------------------------------------- */
#polar-section {
  border-right: 1px solid var(--c-border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--c-bg);
}

#step4-area {
  flex: 1 1 0;
  min-height: 0;
  padding: 12px 14px;
  border-bottom: 1px solid var(--c-border);
  overflow-y: auto;
  background: var(--c-bg-soft);
}

#map-panel {
  flex: 1 1 0;
  min-height: 0;
  display: flex;
  flex-direction: column;
  padding: 10px 12px 12px;
  background: var(--c-bg);
}

#polar-plot {
  flex: 1;
  min-height: 0;
  position: relative;
}

/* ----- Viewer column ------------------------------------------------------- */
#viewer-section {
  display: flex;
  flex-direction: column;
  padding: 10px 12px 12px;
  overflow: hidden;
  background: var(--c-bg);
}

/* ----- Step labels --------------------------------------------------------- */
.step-label {
  font-size: .68rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .15em;
  color: var(--c-cyan);
  margin-bottom: 8px;
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.panel-title {
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--c-muted);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.panel-title .dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--c-brand);
  display: inline-block;
}

/* ----- Cards --------------------------------------------------------------- */
.card {
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 12px 14px;
  box-shadow: var(--shadow-sm);
}
.card--accent {
  background: var(--grad-soft);
}

/* ----- Buttons ------------------------------------------------------------- */
button {
  font-family: var(--ff-sans);
  cursor: pointer;
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: transform .1s var(--ease), background .15s var(--ease),
              box-shadow .2s var(--ease), opacity .15s var(--ease),
              color .15s var(--ease), border-color .15s var(--ease);
}
button:active { transform: translateY(1px); }
button:disabled { opacity: .45; cursor: not-allowed; }

.btn-primary {
  background: var(--grad-brand);
  color: #FFFFFF;
  padding: 9px 16px;
  font-size: .9rem;
  width: 100%;
  box-shadow: 0 4px 14px rgba(6, 182, 212, .28);
  border-radius: var(--radius);
}
.btn-primary:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 8px 22px rgba(6, 182, 212, .42);
  color: #FFFFFF;
}
.btn-primary:disabled { box-shadow: none; }

.btn-secondary {
  background: var(--c-bg);
  color: var(--c-text);
  border: 1px solid var(--c-border);
  padding: 7px 12px;
  font-size: .82rem;
  border-radius: var(--radius-sm);
}
.btn-secondary:hover:not(:disabled) {
  color: var(--c-brand);
  border-color: var(--c-brand);
  background: var(--c-bg-soft);
}

.btn-tonal {
  background: var(--c-bg-soft);
  color: var(--c-text);
  border: 1px solid var(--c-border);
  padding: 7px 12px;
  font-size: .82rem;
  border-radius: var(--radius-sm);
}
.btn-tonal:hover:not(:disabled) {
  background: rgba(0, 102, 204, .08);
  color: var(--c-brand);
  border-color: var(--c-brand);
}

.btn-ghost {
  background: transparent;
  color: var(--c-text-2);
  border: 1px solid transparent;
  padding: 6px 10px;
  font-size: .8rem;
  border-radius: var(--radius-sm);
}
.btn-ghost:hover:not(:disabled) { color: var(--c-brand); background: var(--c-bg-soft); }

/* ----- Inputs -------------------------------------------------------------- */
input, select, textarea {
  font-family: var(--ff-sans);
  background: var(--c-bg);
  color: var(--c-text);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  padding: 7px 10px;
  font-size: .86rem;
  outline: none;
  transition: border-color .15s var(--ease), box-shadow .15s var(--ease);
  width: 100%;
}
input:focus, select:focus, textarea:focus {
  border-color: var(--c-brand);
  box-shadow: 0 0 0 3px rgba(0, 102, 204, .12);
}
input[type=number] { font-family: var(--ff-mono); }
textarea { resize: vertical; min-height: 110px; }

label {
  font-size: .78rem;
  color: var(--c-muted);
  display: block;
  margin-bottom: 4px;
  font-weight: 500;
}

.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.field-row-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 8px; }

/* ----- Toggle switch ------------------------------------------------------- */
.toggle-row {
  display: flex; align-items: center; justify-content: space-between;
  font-size: .82rem; color: var(--c-text-2);
}
.toggle { position: relative; width: 38px; height: 22px; flex-shrink: 0; }
.toggle input { opacity: 0; width: 0; height: 0; }
.toggle .slider {
  position: absolute; inset: 0;
  background: var(--c-bg-alt);
  border: 1px solid var(--c-border-strong);
  border-radius: 11px;
  cursor: pointer;
  transition: background .2s, border-color .2s;
}
.toggle .slider::before {
  content: ''; position: absolute;
  width: 14px; height: 14px; left: 3px; top: 3px;
  background: var(--c-muted); border-radius: 50%;
  transition: transform .2s, background .2s;
}
.toggle input:checked + .slider {
  background: var(--grad-brand); border-color: transparent;
}
.toggle input:checked + .slider::before {
  transform: translateX(16px); background: #fff;
}

/* ----- Drop zone ----------------------------------------------------------- */
#drop-zone {
  border: 2px dashed var(--c-border-strong);
  border-radius: var(--radius);
  padding: 12px 8px;
  text-align: center;
  cursor: pointer;
  transition: border-color .2s, background .2s;
  position: relative;
  background: var(--c-bg);
}
#drop-zone:hover, #drop-zone.dragging {
  border-color: var(--c-brand);
  background: rgba(0, 102, 204, .04);
}
#drop-zone input[type=file] {
  position: absolute; inset: 0;
  opacity: 0; cursor: pointer;
  width: 100%; height: 100%;
}
#drop-zone .drop-icon { font-size: 1.4rem; margin-bottom: 4px; }
#drop-zone .drop-text { font-size: .8rem; color: var(--c-text-2); }
#drop-zone .drop-text strong { color: var(--c-brand); font-weight: 700; }
#drop-zone .drop-hint { font-size: .7rem; color: var(--c-muted); margin-top: 4px; }

/* ----- Example row --------------------------------------------------------- */
#example-row { display: flex; gap: 8px; align-items: center; }
#example-row select { flex: 1; }

/* ----- Status badge -------------------------------------------------------- */
#cif-status {
  font-size: .78rem;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  display: none;
  align-items: center;
  gap: 6px;
}
#cif-status.ok  { background: var(--c-success-bg); color: var(--c-success); display: flex; }
#cif-status.err { background: var(--c-danger-bg);  color: var(--c-danger);  display: flex; }
#cif-status.info { background: var(--c-info-bg);   color: var(--c-cyan);    display: flex; }

/* ----- N/M inputs ---------------------------------------------------------- */
.nm-inputs { display: flex; gap: 8px; }
.nm-inputs input {
  text-align: center;
  font-size: 1rem;
  font-weight: 700;
}

#chiral-props {
  font-size: .78rem;
  color: var(--c-text-2);
  font-family: var(--ff-mono);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2px 14px;
  margin-top: 8px;
  padding: 8px 10px;
  background: var(--c-bg-soft);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
}
#chiral-props .prop-label { color: var(--c-muted); }
#chiral-props .prop-val { color: var(--c-text); font-weight: 600; }

/* ----- Structure info grid ------------------------------------------------- */
.struct-info-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2px 14px;
  margin-top: 8px;
  font-size: .74rem;
  font-family: var(--ff-mono);
  background: var(--c-bg-soft);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
}
.si-label { color: var(--c-muted); }
.si-val   { color: var(--c-text); font-weight: 600; }

/* ----- Reps note ----------------------------------------------------------- */
#reps-info {
  font-size: .72rem;
  color: var(--c-muted);
  font-family: var(--ff-mono);
  text-align: right;
  margin-top: 2px;
}

/* ----- Step 4 summary ------------------------------------------------------ */
#summary-grid {
  display: grid;
  grid-template-columns: auto 1fr auto 1fr;
  gap: 4px 14px;
  font-size: .8rem;
  padding: 8px 10px;
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
}
#summary-grid .sg-label { color: var(--c-muted); }
#summary-grid .sg-val   { color: var(--c-text); font-family: var(--ff-mono); font-weight: 600; }

#wall-plan {
  margin-top: 8px;
  padding: 8px 10px;
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  font-family: var(--ff-mono);
  font-size: .76rem;
  color: var(--c-text-2);
  white-space: pre;
  overflow-x: auto;
  max-height: 160px;
}
#wall-plan .wp-title {
  font-family: var(--ff-sans);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--c-cyan);
  margin-bottom: 6px;
  white-space: normal;
}

#warning-box {
  background: var(--c-warning-bg);
  border: 1px solid var(--c-warning-border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-size: .8rem;
  color: var(--c-warning);
  display: none;
  margin-top: 8px;
}
#warning-box.visible { display: block; }

/* ----- Download buttons grid ---------------------------------------------- */
.dl-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  margin-top: 8px;
}
.dl-btn {
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  color: var(--c-text);
  border-radius: var(--radius-sm);
  padding: 7px 6px;
  font-size: .76rem;
  font-family: var(--ff-mono);
  font-weight: 600;
  cursor: pointer;
  transition: all .15s var(--ease);
  text-align: center;
}
.dl-btn:hover:not(:disabled) {
  color: var(--c-brand);
  border-color: var(--c-brand);
  background: rgba(0, 102, 204, .06);
}
.dl-btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* ----- Advanced/Analysis button rows -------------------------------------- */
.btn-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  margin-top: 8px;
}
.btn-row.btn-row-2 { grid-template-columns: repeat(2, 1fr); }
.btn-row .btn-tonal { font-size: .78rem; padding: 8px 6px; }

.history-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  margin-top: 8px;
}
.history-row button {
  padding: 7px 6px;
  font-size: .78rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

/* ----- Polar plot empty state --------------------------------------------- */
#polar-empty {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  color: var(--c-muted);
  font-size: .9rem;
  text-align: center;
  padding: 20px;
}
#polar-empty .polar-logo {
  height: 120px;
  width: auto;
  margin-bottom: 8px;
  opacity: .85;
}
#polar-empty .big-icon { font-size: 2.5rem; opacity: .35; }

/* ----- 3D viewer ----------------------------------------------------------- */
#viewer-wrap {
  flex: 1;
  min-height: 0;
  position: relative;
  background: var(--viewer-bg);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--c-border);
}
#viewer-3d { width: 100%; height: 100%; }
#viewer-empty {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  color: var(--c-muted);
  font-size: .9rem;
  pointer-events: none;
}
#viewer-empty .big-icon { font-size: 2.6rem; opacity: .35; }

#viewer-controls {
  display: flex;
  gap: 6px;
  align-items: center;
  flex-wrap: wrap;
}
#viewer-controls input[type=number] {
  width: 48px; padding: 3px 6px;
  font-size: .78rem; text-align: center;
  border-radius: var(--radius-sm);
}

/* ----- Map header & controls ---------------------------------------------- */
.map-header {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 8px;
}
.map-title-line {
  display: flex; align-items: center; gap: 8px;
  font-size: .72rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: .1em;
  color: var(--c-muted);
}
.map-title-line .dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--c-brand);
  display: inline-block;
  flex-shrink: 0;
}
.mc-sep { color: var(--c-muted); font-weight: 400; text-transform: none; letter-spacing: 0; }
.mc-sep-v { width: 1px; height: 16px; background: var(--c-border); }

.map-controls {
  display: flex;
  align-items: center;
  gap: 5px;
  flex-wrap: wrap;
}
.map-controls input[type=number] {
  width: 46px; padding: 3px 6px;
  font-size: .76rem; text-align: center;
  border-radius: var(--radius-sm);
}
.map-controls select {
  min-width: 80px;
  padding: 3px 8px;
  font-size: .76rem;
  height: 28px;
  border-radius: var(--radius-sm);
}
.mc-label { font-size: .72rem; color: var(--c-muted); white-space: nowrap; }

/* Segmented switch (color-by toggle) */
.segmented {
  display: inline-flex;
  border: 1px solid var(--c-border);
  border-radius: 999px;
  overflow: hidden;
  background: var(--c-bg);
}
.segmented button {
  background: transparent;
  border: 0;
  padding: 4px 10px;
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .03em;
  color: var(--c-muted);
  cursor: pointer;
  transition: all .2s var(--ease);
}
.segmented button.active {
  background: var(--grad-brand);
  color: #FFFFFF;
}

/* ----- Modals (solid overlay, no translucency) ----------------------------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 37, 64, 0.62);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 24px;
}
.modal-overlay.open { display: flex; }

/* Chain-warning confirmation must sit ABOVE every other modal.
 * It is opened on top of an already-open action modal (Deform, Bundle,
 * MWNT, …); without a higher stacking context the Yes/No buttons are
 * occluded by the action modal — the Promise returned by ``confirmChain``
 * never resolves, the POST is never fired, and the action button's
 * spinner appears to hang forever.  Server log confirms this: no
 * /api/deform or /api/bundle hit at all, only the favicon 404. */
#confirm-overlay { z-index: 2000; }

.modal-box {
  background: var(--c-bg);          /* SOLID — never translucent */
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 24px 26px;
  width: 480px;
  max-width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-modal);
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.modal-box--wide { width: 640px; }

.modal-box h2 {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--c-text);
}
.modal-box p {
  font-size: .85rem;
  color: var(--c-text-2);
  line-height: 1.55;
}
.modal-box .modal-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  margin-top: 4px;
}

.modal-note {
  font-size: .78rem;
  padding: 9px 12px;
  background: var(--c-bg-soft);
  border-left: 3px solid var(--c-brand);
  border-radius: var(--radius-sm);
  color: var(--c-text-2);
  white-space: pre-wrap;
}
.modal-note.warning {
  background: var(--c-warning-bg);
  border-left-color: var(--c-warning);
  color: var(--c-warning);
}

.radio-group {
  display: flex; gap: 14px;
  font-size: .82rem; flex-wrap: wrap;
  margin-top: 4px;
}
.radio-group label {
  display: flex; align-items: center; gap: 5px;
  color: var(--c-text); margin-bottom: 0; cursor: pointer;
  font-weight: 500;
}
.radio-group input[type=radio] { width: auto; accent-color: var(--c-brand); }

/* Methods/DFT text output blocks */
.text-output {
  font-family: var(--ff-mono);
  font-size: .78rem;
  color: var(--c-text);
  background: var(--c-bg-soft);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  white-space: pre-wrap;
  max-height: 360px;
  overflow: auto;
}
.tab-strip {
  display: flex; flex-wrap: wrap; gap: 6px;
  border-bottom: 1px solid var(--c-border);
  padding-bottom: 4px;
  margin-bottom: 4px;
}
.tab-strip button {
  background: transparent;
  border: 1px solid transparent;
  color: var(--c-text-2);
  font-size: .78rem; padding: 5px 12px;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  font-weight: 600;
}
.tab-strip button.active {
  color: var(--c-brand);
  background: var(--c-bg-soft);
  border-color: var(--c-border);
  border-bottom-color: var(--c-bg-soft);
  margin-bottom: -1px;
}

/* Cutoffs editor */
.cutoffs-list {
  display: flex; flex-direction: column; gap: 6px;
  font-family: var(--ff-mono);
  font-size: .8rem;
}
.cutoff-row {
  display: grid;
  grid-template-columns: 1fr 110px 32px;
  gap: 6px; align-items: center;
}
.cutoff-row button {
  background: transparent;
  border: 1px solid var(--c-border);
  color: var(--c-danger);
  border-radius: var(--radius-sm);
  padding: 4px 0;
  font-size: .85rem;
}
.cutoff-row button:hover { background: var(--c-danger-bg); }

/* ----- Toast --------------------------------------------------------------- */
#toast-container {
  position: fixed;
  bottom: 24px; right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: 360px;
}
.toast {
  padding: 11px 16px;
  border-radius: var(--radius);
  font-size: .85rem;
  font-weight: 500;
  background: var(--c-bg);
  color: var(--c-text);
  border: 1px solid var(--c-border);
  box-shadow: var(--shadow-lg);
  animation: slide-in .25s var(--ease);
}
.toast.ok  { background: var(--c-success-bg); color: var(--c-success); border-color: var(--c-success); }
.toast.err { background: var(--c-danger-bg);  color: var(--c-danger);  border-color: var(--c-danger); }
.toast.info { background: var(--c-info-bg);   color: var(--c-cyan);    border-color: var(--c-cyan); }
@keyframes slide-in { from { opacity:0; transform: translateY(12px); } to { opacity:1; transform: translateY(0); } }

/* ----- Spinner ------------------------------------------------------------- */
.spinner {
  width: 18px; height: 18px;
  border: 2.5px solid var(--c-border);
  border-top-color: var(--c-brand);
  border-radius: 50%;
  animation: spin .7s linear infinite;
  display: inline-block;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ----- Footer (NanoEng dark) ---------------------------------------------- */
.site-footer {
  background: var(--c-bg-darker);
  color: #94A3B8;
  padding: 10px 22px;
  font-size: .78rem;
  display: flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
  border-top: 1px solid rgba(148, 163, 184, .12);
  height: var(--footer-height);
}
.site-footer a { color: #CBD5E1; }
.site-footer a:hover { color: var(--c-cyan); }
.site-footer .sep { color: #475569; }
.site-footer__spacer { flex: 1; }
.site-footer .site-footer__badge {
  font-family: var(--ff-mono);
  font-size: .72rem;
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, .25);
  color: #CBD5E1;
}

/* ----- Misc ---------------------------------------------------------------- */
.hidden { display: none !important; }
.divider { height: 1px; background: var(--c-border); margin: 4px 0; }
.kbd {
  font-family: var(--ff-mono);
  font-size: .72rem;
  padding: 1px 6px;
  border: 1px solid var(--c-border);
  border-radius: 4px;
  background: var(--c-bg-soft);
  color: var(--c-text-2);
}

/* Scrollbars */
::-webkit-scrollbar { width: 7px; height: 7px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--c-border-strong); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--c-muted); }

/* Plotly hover labels readable in either theme */
.plotly .hoverlayer .hovertext {
  fill: var(--c-bg) !important;
  stroke: var(--c-border) !important;
}
.plotly .hoverlayer .hovertext text { fill: var(--c-text) !important; }

/* ----- Responsive ---------------------------------------------------------- */
@media (max-width: 1180px) {
  :root { --polar-width: 400px; --sidebar-width: 270px; }
  .nav { display: none; }
}
@media (max-width: 1024px) {
  #main {
    grid-template-columns: 1fr;
    overflow: visible;
  }
  body { height: auto; overflow: auto; }
  #polar-section, #sidebar { border-right: none; border-bottom: 1px solid var(--c-border); }
  #polar-section { min-height: 600px; }
  #step4-area { max-height: 280px; }
  #viewer-section { height: 420px; }
}