/* ═══════════════════════════════════════════════════════════════════════════
   FraudShield — Design System v3.1
   Mobile-first responsive fixes applied in v3.1:
   - wrapper padding scales across 4 breakpoints (not just 580px)
   - header-grid stacks at 640px; status badge wraps gracefully
   - tab buttons shrink text+padding at 640px, icon-only at 420px
   - tab-panel padding reduced on mobile
   - prob-number scales 66px → 48px → 38px
   - all interactive elements meet 44px touch-target minimum
   - form inputs/selects have consistent 44px height on touch devices
   - slider-row stacks vertically below 480px
   - kpi-strip gets a clean 640px breakpoint before jumping to 580px 2-col
   - section-title font and ::after line hidden at small sizes to prevent overflow
   - cost-grid / insight-grid collapse at correct sizes
   - footer stacks properly at 480px
   ═══════════════════════════════════════════════════════════════════════════ */

:root {
  color-scheme: dark;

  --bg:        #0A0C0F;
  --bg2:       #0F1216;
  --surface:   #141920;
  --surface2:  #1A2130;
  --border:    #1E2A3A;
  --border2:   #253347;

  --accent:      #00C896;
  --accent-dim:  rgba(0, 200, 150, 0.07);
  --accent-mid:  rgba(0, 200, 150, 0.14);

  --danger:      #E8455A;
  --danger-dim:  rgba(232, 69, 90, 0.08);
  --warning:     #E8A020;
  --warning-dim: rgba(232, 160, 32, 0.08);
  --info:        #3B82F6;
  --info-dim:    rgba(59, 130, 246, 0.08);
  --purple:      #8B5CF6;

  --text:      #C5D4E8;
  --text-dim:  #7A92AE;
  --text-faint:#3D5270;
  --text-strong:#FFFFFF;
  --on-accent: #040a07;

  --chart-grid:  #1E2A3A;
  --chart-text:  #C5D4E8;
  --chart-muted: #7A92AE;
  --tooltip-bg:  #141920;
  --tooltip-body:#7A92AE;

  --font-head: 'Barlow Condensed', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
  --font-body: 'Barlow', sans-serif;

  --r-sm: 4px;
  --r-md: 6px;

  --space-1: 8px;
  --space-2: 12px;
  --space-3: 16px;
  --space-4: 20px;
  --space-5: 24px;
  --space-6: 32px;
}

body[data-theme="light"] {
  color-scheme: light;

  --bg:        #f3f5f8;
  --bg2:       #ebeff4;
  --surface:   #f8fafc;
  --surface2:  #eef2f7;
  --border:    #ced8e4;
  --border2:   #b8c6d5;

  --accent:      #007a5d;
  --accent-dim:  rgba(0, 122, 93, 0.10);
  --accent-mid:  rgba(0, 122, 93, 0.18);

  --danger:      #b63a4c;
  --danger-dim:  rgba(182, 58, 76, 0.11);
  --warning:     #8f5a08;
  --warning-dim: rgba(143, 90, 8, 0.10);
  --info:        #245fbe;
  --info-dim:    rgba(36, 95, 190, 0.10);
  --purple:      #6948c7;

  --text:        #152a41;
  --text-dim:    #304b67;
  --text-faint:  #5d758f;
  --text-strong: #0b1827;
  --on-accent:   #f7fffb;

  --chart-grid:  #c4d2e0;
  --chart-text:  #1f374e;
  --chart-muted: #516a84;
  --tooltip-bg:  #ffffff;
  --tooltip-body:#304b67;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
[hidden] { display: none !important; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  transition: background 0.22s ease, color 0.22s ease;
}

::-webkit-scrollbar { width: 3px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 2px; }

/* ── LAYOUT ──────────────────────────────────────────────────────────────── */
/* FIX: 4-step padding scale instead of jumping straight to 18px at 580px.
   40px → 28px → 20px → 14px keeps breathing room without wasting screen. */
.wrapper {
  max-width: 1360px;
  margin: 0 auto;
  padding: 0 40px;
}
@media (max-width: 960px)  { .wrapper { padding: 0 28px; } }
@media (max-width: 640px)  { .wrapper { padding: 0 20px; } }
@media (max-width: 420px)  { .wrapper { padding: 0 14px; } }

/* ── HEADER ──────────────────────────────────────────────────────────────── */
header {
  padding: 48px 0 36px;
  position: relative;
}
header::after { display: none; }

.header-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: start;
  column-gap: var(--space-6);
  row-gap: 20px;
}

/* FIX: Stack header on phones so status badge doesn't squeeze the title. */
@media (max-width: 640px) {
  header { padding: 32px 0 28px; }
  .header-grid {
    grid-template-columns: 1fr auto;
    gap: 12px;
    align-items: start;
  }
  .header-copy {
    min-width: 0;
  }
  .header-tools {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    align-self: start;
    gap: 0;
  }
  .theme-toggle {
    flex-shrink: 0;
  }
  h1 { font-size: clamp(26px, 10.5vw, 42px); }
}

.header-eyebrow {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--accent);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.header-eyebrow::before {
  content: '';
  width: 20px;
  height: 1px;
  background: var(--accent);
  flex-shrink: 0;
}

h1 {
  font-family: var(--font-head);
  font-size: clamp(32px, 5vw, 64px);
  font-weight: 800;
  letter-spacing: -0.5px;
  line-height: 0.92;
  color: var(--text-strong);
  text-transform: uppercase;
}
h1 em { font-style: normal; color: var(--accent); }

.header-sub {
  color: var(--text-dim);
  font-size: 13px;
  font-weight: 300;
  margin-top: var(--space-3);
  max-width: 500px;
  line-height: 1.8;
}
@media (max-width: 640px) {
  .header-sub { max-width: 100%; font-size: 12px; }
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid var(--accent-mid);
  padding: 10px 16px;
  border-radius: var(--r-sm);
  white-space: nowrap;
  letter-spacing: 0.04em;
}
.status-row {
  display: flex;
  grid-column: 1;
  justify-content: flex-start;
  margin-top: 0;
}
.status-offline { color: var(--warning); }
.header-tools {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  align-self: start;
  gap: 0;
  margin-top: -2px;
}
.theme-toggle {
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 2px solid var(--border2);
  border-radius: 9px;
  background: var(--bg2);
  color: var(--text-faint);
  cursor: pointer;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.02);
  transition: border-color 0.18s, color 0.18s, background 0.18s;
}
.theme-toggle:hover {
  border-color: var(--text-faint);
  color: var(--text-dim);
}
.theme-toggle-icon {
  width: 18px;
  height: 18px;
  display: block;
}
.theme-toggle-icon svg {
  width: 100%;
  height: 100%;
  display: block;
}
.theme-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
@media (max-width: 640px) {
  .status-row {
    grid-column: 1 / -1;
    justify-content: flex-start;
    margin-top: 14px;
  }
  .status-badge {
    max-width: min(100%, 520px);
    justify-content: flex-start;
    text-align: left;
  }
  .theme-toggle {
    width: 40px;
    height: 40px;
  }
  .theme-toggle-icon {
    width: 18px;
    height: 18px;
  }
  .status-badge {
    font-size: 9px;
    padding: 8px 12px;
    white-space: normal;
    overflow-wrap: anywhere;
    word-break: normal;
  }
}

.status-dot {
  width: 5px; height: 5px;
  background: var(--accent);
  border-radius: 50%;
  flex-shrink: 0;
  animation: pulse 2.4s ease-in-out infinite;
}
.spinner-xs {
  width: 7px;
  height: 7px;
  border-width: 1px;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.4; }
}

/* ── KPI STRIP ────────────────────────────────────────────────────────────── */
.kpi-strip-shell {
  background: transparent;
  border-bottom: none;
}
.kpi-strip {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  overflow: hidden;
}
.kpi-item {
  padding: 20px 22px;
  border-right: 1px solid var(--border);
  transition: background 0.15s;
  position: relative;
}
.kpi-item:first-child { border-left: none; }
.kpi-item:last-child  { border-right: none; }
.kpi-item:hover { background: var(--surface); }

.kpi-accent-line {
  position: absolute; top: 0; left: 0; right: 0; height: 2px;
}
.kpi-accent-line.accent-accent { background: var(--accent); }
.kpi-accent-line.accent-danger { background: var(--danger); }
.kpi-accent-line.accent-warning { background: var(--warning); }
.kpi-accent-line.accent-info { background: var(--info); }
.kpi-accent-line.accent-purple { background: var(--purple); }
.kpi-val {
  font-family: var(--font-head);
  font-size: 26px;
  font-weight: 700;
  color: var(--text-strong);
  line-height: 1;
  letter-spacing: -0.3px;
}
.kpi-lbl {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-faint);
  margin-top: 7px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.kpi-sub {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--accent);
  margin-top: 4px;
  opacity: 0.75;
}

/* ── TABS ─────────────────────────────────────────────────────────────────── */
.tabs-wrapper {
  background: transparent;
  border-bottom: none;
  position: sticky;
  top: 0;
  z-index: 100;
}
.tabs-wrapper .wrapper {
  padding-top: 0;
  padding-bottom: 0;
}
.tabs {
  display: flex;
  width: 100%;
  padding: 0 14px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--border2) transparent;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 var(--r-md) var(--r-md);
  overflow-y: hidden;
}
.tab-btn {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-faint);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 14px 18px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 8px;
  /* FIX: Ensure 44px touch target height */
  min-height: 44px;
}
.tab-btn:hover { color: var(--text-dim); }
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); }
.tab-icon { font-size: 12px; }
.tab-text { display: inline; }

/* Compact 5-tab strip for phones while preserving readability. */
@media (max-width: 640px) {
  .tabs { padding: 0 4px; }
  .tab-btn {
    padding: 11px 8px;
    font-size: 8px;
    gap: 4px;
    letter-spacing: 0.05em;
  }
  .tab-icon { font-size: 11px; }
}
@media (max-width: 420px) {
  .tabs { padding: 0; }
  .tab-btn {
    flex: 0 0 auto;
    justify-content: center;
    padding: 10px 7px;
    font-size: 7px;
    letter-spacing: 0.03em;
    gap: 4px;
  }
  .tab-icon {
    font-size: 10px;
  }
}

/* ── TAB PANELS ───────────────────────────────────────────────────────────── */
.tab-panel {
  display: none;
  padding: 34px 0 56px;
}
.tab-panel.active {
  display: block;
  animation: panelIn 0.2s ease;
}
/* FIX: Reduce tab panel top/bottom padding on phones */
@media (max-width: 640px) {
  .tab-panel { padding: 24px 0 40px; }
}
@keyframes panelIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* ── SECTION ──────────────────────────────────────────────────────────────── */
.section-head { margin-bottom: 24px; }
.section-block { margin-bottom: 16px; }
.section-block-lg { margin-bottom: 20px; }
.section-title {
  font-family: var(--font-head);
  font-size: 22px;
  font-weight: 700;
  color: var(--text-strong);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  display: flex;
  align-items: center;
  gap: 14px;
}
.section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}
.section-title em { font-style: normal; color: var(--accent); }
.section-cap {
  font-size: 12px;
  color: var(--text-dim);
  margin-top: 8px;
  font-weight: 300;
  line-height: 1.72;
}
.section-title-sm { font-size: 18px; margin-bottom: 14px; }
.section-title-tight { font-size: 18px; margin-bottom: 6px; }
.section-copy { color: var(--text-dim); font-size: 12px; margin-bottom: 18px; }

/* FIX: Hide the ::after decorative line on narrow phones — it causes
   the title text to be squashed into too little space. */
@media (max-width: 480px) {
  .section-title { font-size: 18px; }
  .section-title::after { display: none; }
  .section-title-sm { font-size: 16px; }
}

/* ── GRID ─────────────────────────────────────────────────────────────────── */
.grid-2      { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid-3      { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid-4      { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.grid-scorer { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 20px; align-items: start; }
.grid-scorer > * { min-width: 0; align-self: start; }

/* ── CARD ─────────────────────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: clamp(18px, 1.8vw, 22px);
}
.card-title {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-faint);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;          /* FIX: title + badge + button wrap on narrow cards */
}
.card-title::after {
  content: '';
  flex: 1;
  min-width: 20px;          /* FIX: prevent the line collapsing to 0px */
  height: 1px;
  background: var(--border);
}
.chart-frame { position: relative; }
.chart-h-170 { height: 170px; }
.chart-h-190 { height: 190px; }
.chart-h-210 { height: 210px; }
.chart-h-250 { height: 250px; }
.chart-h-270 { height: 270px; }
.chart-h-290 { height: 290px; }

/* ── DIVIDER ──────────────────────────────────────────────────────────────── */
.divider { border: none; border-top: 1px solid var(--border); margin: 28px 0; }

/* ── TABLE ────────────────────────────────────────────────────────────────── */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 11px;
}
.table-scroll {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.table-scroll .data-table { min-width: 620px; }
.data-table th {
  text-align: left; padding: 9px 14px;
  color: var(--text-faint); font-weight: 500; font-size: 9px;
  letter-spacing: 0.1em; text-transform: uppercase;
  border-bottom: 1px solid var(--border); background: var(--bg2);
}
.data-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: rgba(255,255,255,0.012); }
.data-table .best-row td { background: rgba(0, 200, 150, 0.03); }
.data-table .best-row td:first-child { border-left: 2px solid var(--accent); }
.badge-best {
  font-size: 9px;
  background: var(--accent-dim);
  color: var(--accent);
  border: 1px solid rgba(0,200,150,0.2);
  padding: 2px 8px;
  border-radius: 2px;
  letter-spacing: 0.06em;
}
.num { color: var(--accent); font-weight: 600; }
.num-red { color: var(--danger); font-weight: 600; }

/* ── INSIGHT CARDS ────────────────────────────────────────────────────────── */
.insight-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-top: 10px;
}
.insight-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 16px 18px;
  position: relative;
  overflow: hidden;
}
.insight-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--accent);
}
.insight-card:nth-child(2)::before { background: var(--warning); }
.insight-card:nth-child(3)::before { background: var(--danger); }
.insight-card:nth-child(4)::before { background: var(--purple); }
.insight-icon  { font-size: 17px; margin-bottom: 10px; opacity: 0.75; }
.insight-title {
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 700;
  color: var(--text-strong);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 7px;
}
.insight-body { font-size: 12px; color: var(--text-dim); line-height: 1.75; }
.insight-inline-code {
  font-size: 10px;
  color: var(--accent);
}

/* ── ABOUT TAB ─────────────────────────────────────────────────────────────── */
.about-profile-card {
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.about-name {
  font-family: var(--font-head);
  font-size: 40px;
  font-weight: 800;
  color: var(--text-strong);
  line-height: 0.95;
  letter-spacing: -0.5px;
  text-transform: uppercase;
}
.about-role {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 10px;
}
.about-summary {
  color: var(--text-dim);
  font-size: 12px;
  line-height: 1.9;
  margin-top: 14px;
  max-width: 58ch;
}
.about-link-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.about-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  min-height: 44px;
  padding: 10px 12px;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}
.about-link-icon {
  font-size: 13px;
  opacity: 0.85;
  flex-shrink: 0;
}
.about-link-svg {
  width: 13px;
  height: 13px;
  opacity: 0.9;
  flex-shrink: 0;
  display: block;
}
.about-link:hover {
  border-color: rgba(0, 200, 150, 0.4);
  color: var(--accent);
  background: rgba(0, 200, 150, 0.04);
}
.about-link:focus-visible {
  outline: 2px solid rgba(0, 200, 150, 0.75);
  outline-offset: 2px;
}
.about-note {
  margin-top: 12px;
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.04em;
}
.about-architecture {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
}
.about-step {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 12px;
  min-width: 0;
}
.about-step-title {
  font-family: var(--font-mono);
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 8px;
}
.about-step-copy {
  font-size: 11px;
  color: var(--text-dim);
  line-height: 1.75;
}
.about-list,
.about-paper-list {
  list-style: none;
  display: grid;
  gap: 10px;
}
.about-list li,
.about-paper-list li {
  position: relative;
  padding-left: 14px;
  color: var(--text-dim);
  font-size: 12px;
  line-height: 1.75;
}
.about-list li::before,
.about-paper-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.8;
}
.about-paper-list a {
  color: var(--accent);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.03em;
}
.about-paper-list a:hover {
  text-decoration: underline;
}

/* ── FORM ─────────────────────────────────────────────────────────────────── */
.form-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 20px;
}
.form-section-title {
  font-family: var(--font-mono);
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}
.form-grid   { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.form-grid-3 { grid-template-columns: 1fr 1fr 1fr; }
.form-spacer { margin-top: 8px; }

.field { display: flex; flex-direction: column; gap: 5px; }
.field-full { grid-column: 1 / -1; }
.field label {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.field input,
.field select {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 9px 11px;
  outline: none;
  appearance: none;
  transition: border-color 0.15s;
  /* FIX: min-height ensures 44px touch targets on all inputs/selects */
  min-height: 44px;
  width: 100%;
}
.field input:focus, .field select:focus { border-color: var(--accent); }
.field-helper {
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.03em;
  line-height: 1.6;
}
.field-hint {
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 10px;
  margin-top: 4px;
  line-height: 1.5;
}
.field-badge { color: var(--accent); font-size: 9px; }
.readonly-input {
  opacity: 0.72;
  cursor: default;
  background: rgba(255,255,255,0.02) !important;
}
.field select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%233D5270'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 28px;
}

/* ── BUTTONS ─────────────────────────────────────────────────────────────── */
.btn-primary {
  width: 100%;
  background: var(--accent);
  color: var(--on-accent);
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  border: none;
  border-radius: var(--r-sm);
  /* FIX: explicit min-height for 44px touch target */
  padding: 13px 24px;
  min-height: 44px;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.1s;
  margin-top: 14px;
}
.btn-primary:hover   { opacity: 0.88; }
.btn-primary:active  { transform: scale(0.99); }
.btn-primary:disabled { opacity: 0.3; cursor: not-allowed; }
.btn-primary-inline { max-width: 200px; }
.btn-score {
  width: auto;
  min-width: 248px;
  max-width: 100%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-ghost {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 9px;
  padding: 4px 12px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  /* FIX: 44px touch target */
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
.btn-ghost:hover { color: var(--text-dim); border-color: var(--text-faint); }
.btn-ghost-inline { margin-left: auto; font-size: 9px; }

/* ── RESULT PANEL ─────────────────────────────────────────────────────────── */
.result-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 22px;
  position: relative;
  overflow: hidden;
  transition: border-color 0.3s;
}
.result-panel.high   { border-color: rgba(232,69,90,0.3); }
.result-panel.medium { border-color: rgba(232,160,32,0.3); }
.result-panel.low    { border-color: rgba(0,200,150,0.2); }
.result-panel::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--border);
  transition: background 0.3s;
}
.result-panel.high::before   { background: var(--danger); }
.result-panel.medium::before { background: var(--warning); }
.result-panel.low::before    { background: var(--accent); }

.result-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 260px;
  gap: 12px;
  color: var(--text-faint);
}
.result-empty-icon { font-size: 34px; opacity: 0.35; }
.result-empty-text {
  font-family: var(--font-mono);
  font-size: 11px;
  text-align: center;
  line-height: 2;
  color: var(--text-faint);
}

.prob-label {
  font-family: var(--font-mono);
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-faint);
  margin-bottom: 8px;
}
/* FIX: Scale the large score number down for narrow screens */
.prob-number {
  font-family: var(--font-head);
  font-size: 66px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -1.5px;
  transition: color 0.3s;
}
.prob-number.high   { color: var(--danger); }
.prob-number.medium { color: var(--warning); }
.prob-number.low    { color: var(--accent); }

.tier-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 5px 12px;
  border-radius: var(--r-sm);
  margin-top: 12px;
}
.tier-badge.high   { background: var(--danger-dim);  color: var(--danger);  border: 1px solid rgba(232,69,90,0.22); }
.tier-badge.medium { background: var(--warning-dim); color: var(--warning); border: 1px solid rgba(232,160,32,0.22); }
.tier-badge.low    { background: var(--accent-dim);  color: var(--accent);  border: 1px solid rgba(0,200,150,0.18); }

.gauge-track {
  height: 2px;
  background: var(--border2);
  margin: 18px 0 6px;
  border-radius: 2px;
  overflow: hidden;
}
.gauge-fill {
  width: 0;
  height: 100%;
  border-radius: 2px;
  transition: width 0.55s cubic-bezier(0.4,0,0.2,1), background 0.3s;
}
.result-meta-line {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-faint);
  overflow-wrap: anywhere;
}

.flags-title {
  font-family: var(--font-mono);
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-faint);
  margin: 20px 0 10px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}
.flag-item {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 7px 0;
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  color: var(--text);
}
.flag-item:last-child { border-bottom: none; }
.flag-item .icon { flex-shrink: 0; font-size: 13px; margin-top: 1px; }

.result-meta {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-faint);
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
  letter-spacing: 0.04em;
}

/* ── DECISION TRACE ───────────────────────────────────────────────────────── */
.trace-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 4px 0;
  border-bottom: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 10px;
}
.trace-row:last-child { border-bottom: none; }
.trace-k {
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: .08em;
  flex-shrink: 0;
  margin-right: 12px;
}
.trace-v { color: var(--text); text-align: right; overflow-wrap: anywhere; }
.trace-panel {
  margin: 0 0 14px;
  padding: 12px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
}

/* ── THRESHOLD SLIDER ─────────────────────────────────────────────────────── */
.slider-row {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}
.slider-row label {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-faint);
  white-space: nowrap;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
#threshold-slider {
  flex: 1;
  -webkit-appearance: none;
  background: var(--border2);
  height: 2px;
  outline: none;
  border-radius: 2px;
  /* FIX: ensure slider touch area is tall enough */
  padding: 10px 0;
  cursor: pointer;
}
#threshold-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px; height: 20px;  /* FIX: larger thumb = easier to grab on touch */
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 0 0 4px rgba(0,200,150,0.12);
}
#threshold-slider::-moz-range-thumb {
  width: 20px; height: 20px;
  background: var(--accent);
  border-radius: 50%;
  border: none;
  cursor: pointer;
}
.slider-val {
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 700;
  color: var(--accent);
  min-width: 44px;
  text-align: right;
}

/* FIX: Stack slider label/value on very narrow screens */
@media (max-width: 480px) {
  .slider-row {
    flex-wrap: wrap;
    gap: 10px;
  }
  .slider-row label { width: 100%; }
  #threshold-slider { order: 1; }
  .slider-val { order: 2; min-width: 40px; }
}

.threshold-metrics {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  margin-bottom: 16px;
}
.t-metric {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 13px 10px;
  text-align: center;
  /* FIX: ensure 44px height on mobile */
  min-height: 44px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.t-metric-val {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  color: var(--text-strong);
}
.t-metric-lbl {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-faint);
  margin-top: 5px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.metric-warning { color: var(--warning); }
.metric-danger  { color: var(--danger); }
.text-warning { color: var(--warning); }
.text-faint { color: var(--text-faint); }

/* ── MODEL CARD ───────────────────────────────────────────────────────────── */
.model-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 2px solid var(--accent);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  padding: 20px 22px;
  font-size: 12px;
  line-height: 2.1;
  color: var(--text-dim);
}
.model-card strong {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
}
.model-card-title {
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  color: var(--text-strong);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 14px;
}

/* Classification report table is only 4 columns; avoid forcing a desktop width. */
#clf-report-wrap .table-scroll .data-table { min-width: 0; }

@media (max-width: 640px) {
  .model-card {
    padding: 14px;
    font-size: 11px;
    line-height: 1.85;
    border-left-width: 1px;
    border-radius: var(--r-md);
  }
  .model-card strong {
    font-size: 9px;
    letter-spacing: 0.04em;
  }
  .model-card-title {
    font-size: 13px;
    margin-bottom: 10px;
  }
  #clf-report-wrap .data-table {
    font-size: 10px;
  }
  #clf-report-wrap .data-table th,
  #clf-report-wrap .data-table td {
    padding: 8px 10px;
  }
}

@media (max-width: 420px) {
  .model-card {
    font-size: 10px;
    line-height: 1.75;
    padding: 12px;
  }
  .model-card-title {
    font-size: 12px;
  }
  #clf-report-wrap .data-table {
    font-size: 9px;
  }
  #clf-report-wrap .data-table th,
  #clf-report-wrap .data-table td {
    padding: 7px 8px;
  }
}

/* ── BUSINESS IMPACT ──────────────────────────────────────────────────────── */
.cost-inputs {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 20px;
  margin-bottom: 18px;
}
.cost-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }

/* Main 4-up KPI cards */
.biz-kpi-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 22px;
}
.biz-kpi {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 18px 18px 20px;
  position: relative;
  display: flex;
  flex-direction: column;
}
.biz-kpi::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 2px;
  border-radius: 0 0 var(--r-md) var(--r-md);
}
.biz-kpi.green::after { background: var(--accent); }
.biz-kpi.red::after   { background: var(--danger); }
.biz-kpi.amber::after { background: var(--warning); }
.biz-kpi.blue::after  { background: var(--info); }

.biz-kpi-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}
.biz-kpi-icon { font-size: 15px; opacity: 0.75; flex-shrink: 0; line-height: 1; }
.biz-kpi-lbl {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  line-height: 1.4;
}
.biz-kpi-val {
  font-family: var(--font-head);
  font-size: 24px;
  font-weight: 700;
  color: var(--text-strong);
  line-height: 1;
  margin-bottom: 6px;
}
.biz-kpi-sub {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-faint);
  letter-spacing: 0.04em;
  margin-top: auto;
}
.biz-kpi.green .biz-kpi-val { color: var(--accent); }
.biz-kpi.red   .biz-kpi-val { color: var(--danger); }
.biz-kpi.amber .biz-kpi-val { color: var(--warning); }
.biz-kpi.blue  .biz-kpi-val { color: var(--info); }

/* Impact interpretation helper */
.impact-guidance {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 16px 18px;
  margin-bottom: 18px;
}
.impact-guidance-title {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-faint);
  margin-bottom: 10px;
}
.impact-guidance-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}
.impact-guidance-item {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.impact-guidance-k {
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
}
.impact-guidance-v {
  font-family: var(--font-head);
  font-size: 22px;
  color: var(--text-strong);
  line-height: 1;
}

/* ── YEAR-END PROJECTION PANEL ────────────────────────────────────────────── */
.projection-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  overflow: hidden;
}
.projection-panel-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 16px 22px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 6px;
}
.projection-panel-title {
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 700;
  color: var(--text-strong);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.projection-panel-note {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-faint);
  letter-spacing: 0.03em;
}
.projection-grid {
  display: grid;
  grid-template-columns: 1fr 1px 1fr 1px 1fr;
  align-items: stretch;
}
.projection-divider { background: var(--border); width: 1px; }
.projection-item {
  padding: 24px 28px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.projection-item-top {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}
.projection-item-icon { font-size: 14px; opacity: 0.7; }
.projection-item-lbl {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.projection-item-val {
  font-family: var(--font-head);
  font-size: 30px;
  font-weight: 800;
  line-height: 1;
  color: var(--text-strong);
  margin-bottom: 6px;
}
.projection-item-sub {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-faint);
  letter-spacing: 0.04em;
}
.projection-item.p-blue  .projection-item-val { color: var(--info); }
.projection-item.p-green .projection-item-val { color: var(--accent); }
.projection-item.p-amber .projection-item-val { color: var(--warning); }

/* ── HISTORY ──────────────────────────────────────────────────────────────── */
.history-section { margin-top: 24px; }
.history-title {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-faint);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
#history-section .table-scroll .data-table { min-width: 540px; }
.section-block-22 { margin-bottom: 22px; }
.assumptions-note {
  font-size: 10px;
  color: var(--text-faint);
  font-family: var(--font-mono);
  margin-top: 18px;
  line-height: 1.9;
  border-top: 1px solid var(--border);
  padding-top: 14px;
  letter-spacing: 0.02em;
}
.shap-midline {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--border2);
}

/* ── LOADING ──────────────────────────────────────────────────────────────── */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px 0;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-faint);
  letter-spacing: 0.04em;
}
.spinner {
  width: 14px; height: 14px;
  border: 1.5px solid var(--border2);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── CONFUSION MATRIX ─────────────────────────────────────────────────────── */
.cm-grid {
  display: grid;
  grid-template-columns: auto 1fr 1fr;
  grid-template-rows: auto 1fr 1fr;
  gap: 3px;
  max-width: 290px;
  margin: 0 auto;
}
.cm-label {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4px 6px;
}
.cm-cell {
  aspect-ratio: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  padding: 14px;
  font-family: var(--font-head);
  font-size: 24px;
  font-weight: 700;
  color: var(--text-strong);
  border-radius: var(--r-sm);
}
.cm-cell.tp { background: rgba(0,200,150,0.1); }
.cm-cell.tn { background: rgba(59,130,246,0.1); }
.cm-cell.fp { background: rgba(232,160,32,0.07); }
.cm-cell.fn { background: rgba(232,69,90,0.1); }
.cm-cell-type {
  font-size: 9px;
  font-family: var(--font-mono);
  font-weight: 400;
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.cm-wrap { padding: 10px 0; }
.cm-thresh-label { color: var(--accent); margin-left: 6px; }

/* FIX: On small phones the confusion matrix at max-width 290px inside
   22px padding can overflow. Let it shrink to fit. */
@media (max-width: 420px) {
  .cm-grid { max-width: 100%; }
  .cm-cell { font-size: 18px; padding: 8px; }
}

/* ── SHAP ─────────────────────────────────────────────────────────────────── */
.shap-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 0;
  font-family: var(--font-mono);
  font-size: 11px;
}
.shap-feat {
  flex: 0 0 150px;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.shap-bar-track {
  flex: 1;
  height: 10px;
  background: var(--border);
  border-radius: 2px;
  position: relative;
  overflow: hidden;
}
.shap-bar-fill {
  position: absolute;
  height: 100%;
  top: 0;
  transition: width 0.5s ease;
}
.shap-val {
  flex: 0 0 60px;
  text-align: right;
  color: var(--text-faint);
  font-size: 10px;
}

/* ── API BANNER ───────────────────────────────────────────────────────────── */
.api-banner {
  background: rgba(232,160,32,0.05);
  border: 1px solid rgba(232,160,32,0.16);
  border-left: 2px solid var(--warning);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--warning);
  margin-bottom: 20px;
  line-height: 1.8;
  display: none;
  letter-spacing: 0.02em;
  word-break: break-word;    /* FIX: long URLs break on phones */
}
.api-banner.show { display: block; }
.api-banner code {
  background: rgba(232,160,32,0.1);
  padding: 1px 6px;
  border-radius: 2px;
  font-size: 11px;
  word-break: break-all;     /* FIX: code snippets break on phones */
}

/* ── FOCUS STATES ─────────────────────────────────────────────────────────── */
.tab-btn:focus-visible,
.btn-primary:focus-visible,
.btn-ghost:focus-visible,
.field input:focus-visible,
.field select:focus-visible,
#threshold-slider:focus-visible {
  outline: 2px solid rgba(0, 200, 150, 0.75);
  outline-offset: 2px;
}

/* ═══════════════════════════════════════════════════════════════════════════
   RESPONSIVE BREAKPOINTS — consolidated & commented
   960px  tablet landscape / small laptop
   768px  tablet portrait                      ← NEW in v3.1
   640px  large phone landscape / small tablet ← NEW in v3.1
   480px  phone portrait (most iPhones)        ← expanded in v3.1
   420px  small phone (SE, Moto G)             ← expanded in v3.1
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── 960px ────────────────────────────────────────────────────────────────── */
@media (max-width: 960px) {
  .grid-2,
  .grid-3,
  .grid-4,
  .grid-scorer     { grid-template-columns: 1fr; }

  .kpi-strip       { grid-template-columns: repeat(3, 1fr); }
  .kpi-item:nth-child(3)  { border-right: none; }
  .kpi-item:nth-child(4)  { border-left: 1px solid var(--border); }

  .insight-grid    { grid-template-columns: repeat(2, 1fr); }

  .biz-kpi-grid    { grid-template-columns: repeat(2, 1fr); }

  .projection-grid { grid-template-columns: 1fr; }
  .projection-divider    { display: none; }
  .projection-item       { border-bottom: 1px solid var(--border); }
  .projection-item:last-child { border-bottom: none; }

  .cost-grid             { grid-template-columns: 1fr 1fr; }
  .threshold-metrics     { grid-template-columns: 1fr 1fr 1fr; }
  .form-grid-3           { grid-template-columns: 1fr 1fr; }
  .about-architecture    { grid-template-columns: 1fr 1fr; }
  .impact-guidance-grid  { grid-template-columns: 1fr 1fr; }
}

/* ── 768px ────────────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  /* KPI strip: keep 3 cols but reduce padding so values don't overflow */
  .kpi-item { padding: 16px 14px; }
  .kpi-val  { font-size: 21px; }

  /* Tabs: tighten before the 640px icon-only mode kicks in */
  .tab-btn  { padding: 13px 14px; }

  /* Card padding slightly reduced */
  .card,
  .form-section,
  .cost-inputs,
  .result-panel { padding: 18px; }

  /* Prevent iOS auto-zoom on form focus (which makes panels look like they grow). */
  .field input,
  .field select {
    font-size: 16px;
  }
}

/* ── 640px ────────────────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  /* KPI strip: still 3 cols but text trimmed */
  .kpi-val  { font-size: 18px; }
  .kpi-lbl  { font-size: 8px; letter-spacing: 0.06em; }
  .kpi-sub  { display: none; }          /* hide sub-label to save vertical space */
  .kpi-item { padding: 14px 10px; }

  /* Tighten section head spacing */
  .section-head { margin-bottom: 18px; }

  /* form-grid-3 → 1 col at 640px (was 960px for some grids) */
  .form-grid-3 { grid-template-columns: 1fr; }

  /* threshold metrics → 3 cols fits reasonably at 640px */
  .threshold-metrics { grid-template-columns: 1fr 1fr 1fr; }

  .about-name       { font-size: 30px; }
  .about-link-grid  { grid-template-columns: 1fr; }
  .about-architecture { grid-template-columns: 1fr; }
}

/* ── 480px ────────────────────────────────────────────────────────────────── */
@media (max-width: 480px) {
  /* All major content grids → single column */
  .form-grid,
  .form-grid-3,
  .cost-grid,
  .insight-grid          { grid-template-columns: 1fr; }
  .impact-guidance-grid  { grid-template-columns: 1fr; }

  /* Threshold metrics: 2+2+1 → just go full single column */
  .threshold-metrics     { grid-template-columns: 1fr 1fr; }

  /* Business KPI: 2 → 1 col so values have room to breathe */
  .biz-kpi-grid          { grid-template-columns: 1fr; }

  /* FIX: Scale down large score number */
  .prob-number           { font-size: 48px; letter-spacing: -0.5px; }

  /* FIX: projection values too large on small phones */
  .projection-item-val   { font-size: 22px; }
  .projection-item       { padding: 18px 16px; }
  .projection-panel-head { align-items: flex-start; }
  .projection-panel-note { width: 100%; }

  .btn-primary-inline    { max-width: 100%; }
  .btn-score {
    min-width: 0;
    width: auto;
  }

  /* Cards and panels */
  .card,
  .form-section,
  .cost-inputs,
  .result-panel          { padding: 14px; }

  /* Divider spacing */
  .divider               { margin: 20px 0; }

  /* result-meta: stack instead of space-between */
  .result-meta           { flex-direction: column; gap: 4px; align-items: flex-start; }

  /* trace rows: stack on very small screens */
  .trace-row             { flex-direction: column; align-items: flex-start; gap: 2px; }
  .trace-v               { text-align: left; }

  /* SHAP: column layout */
  .shap-row              { flex-direction: column; align-items: flex-start; gap: 6px; }
  .shap-feat,
  .shap-val              { flex: initial; width: 100%; }
  .shap-bar-track        { width: 100%; }

  #history-section .table-scroll .data-table {
    min-width: 0;
    font-size: 10px;
  }
  #history-section .data-table th,
  #history-section .data-table td {
    padding: 8px 8px;
  }
  #history-section .data-table th:nth-child(1),
  #history-section .data-table td:nth-child(1) {
    display: none;
  }
}

/* ── 420px ────────────────────────────────────────────────────────────────── */
@media (max-width: 420px) {
  /* KPI strip: collapse to 2 cols on very small phones */
  .kpi-strip             { grid-template-columns: repeat(2, 1fr); }
  .kpi-item:nth-child(3) { border-right: 1px solid var(--border); }   /* reset 960px rule */
  .kpi-item:nth-child(4) { border-left: none; }                        /* reset 960px rule */
  .kpi-item:nth-child(2n)   { border-right: none; }
  .kpi-item:nth-child(2n+1) { border-left: 1px solid var(--border); }
  .kpi-item:first-child      { border-left: none; }

  /* FIX: further scale down score number */
  .prob-number           { font-size: 38px; }

  /* threshold metrics: single column */
  .threshold-metrics     { grid-template-columns: 1fr; }

  /* Tighter chart heights on small phones to reduce scrolling */
  .chart-h-270           { height: 220px; }
  .chart-h-290           { height: 240px; }
  .chart-h-250           { height: 200px; }

  .history-title {
    flex-wrap: wrap;
    gap: 8px;
  }

  .history-title .btn-ghost {
    width: 100%;
    justify-content: center;
  }
}

/* ── FOOTER ───────────────────────────────────────────────────────────────── */
footer {
  border-top: 1px solid var(--border);
  padding: 22px 0;
  margin-top: 48px;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}
.footer-copy {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-faint);
  letter-spacing: 0.04em;
}
.footer-stack { display: flex; gap: 6px; flex-wrap: wrap; }
.stack-tag {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-faint);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 3px 9px;
  letter-spacing: 0.06em;
}
/* FIX: Stack footer items on small phones */
@media (max-width: 480px) {
  .footer-inner  { flex-direction: column; align-items: flex-start; gap: 12px; }
  footer         { padding: 18px 0; margin-top: 32px; }
}