:root {
  color-scheme: light;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --ink: #0b1725;
  --muted: #607083;
  --muted-strong: #415266;
  --line: #d9e2ea;
  --line-strong: #bccbd8;
  --panel: #ffffff;
  --surface: #eef3f7;
  --surface-2: #f7f9fb;
  --navy: #071521;
  --navy-2: #0d2233;
  --accent: #0b8f83;
  --accent-strong: #067368;
  --accent-soft: #e8f8f5;
  --cyan: #2bc7b8;
  --blue: #2667d8;
  --blue-soft: #edf4ff;
  --danger: #b42318;
  --danger-soft: #fff2f0;
  --warning: #9a4b12;
  --warning-soft: #fff6ec;
  --success: #16724d;
  --success-soft: #ecf9f2;
  --shadow: 0 18px 50px rgba(7, 21, 33, 0.09);
  --shadow-tight: 0 8px 22px rgba(7, 21, 33, 0.08);
  --radius-xl: 18px;
  --radius-lg: 14px;
  --radius-md: 10px;
  --radius-sm: 8px;
}

* { box-sizing: border-box; }

html { background: var(--surface); }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 8% 0%, rgba(43, 199, 184, 0.10), transparent 28rem),
    radial-gradient(circle at 95% 14%, rgba(38, 103, 216, 0.07), transparent 28rem),
    var(--surface);
  color: var(--ink);
}

button, input, select { font: inherit; }
button, select { cursor: pointer; }
button { color: inherit; }

.app-header {
  min-height: 64px;
  padding: 8px clamp(14px, 2.4vw, 34px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  background: linear-gradient(105deg, var(--navy), #0a1d2d 66%, #0d2937);
  color: #fff;
  border-bottom: 1px solid rgba(255,255,255,.09);
  box-shadow: 0 8px 30px rgba(7, 21, 33, 0.17);
  position: sticky;
  top: 0;
  z-index: 20;
}

.brand-block {
  display: flex;
  align-items: center;
  gap: 11px;
  min-width: 0;
}

.brand-icon {
  width: 46px;
  height: 46px;
  flex: 0 0 46px;
  border-radius: 11px;
  box-shadow: 0 5px 18px rgba(0,0,0,.22);
}

.brand-copy { min-width: 0; }
.brand-line { display: flex; align-items: baseline; gap: 10px; }
.brand-line strong { font-size: 1.18rem; letter-spacing: -.025em; }
.brand-line span {
  color: #8de6dc;
  font-size: .67rem;
  font-weight: 800;
  letter-spacing: .11em;
  text-transform: uppercase;
}
.brand-copy p {
  margin: 1px 0 0;
  color: #b7c7d5;
  font-size: .76rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-actions { display: flex; align-items: center; gap: 8px; }
.connection-status {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 4px 9px;
  border-radius: 999px;
  font-size: .72rem;
  font-weight: 750;
  white-space: nowrap;
}
.connection-status::before {
  content: "";
  width: 7px;
  height: 7px;
  margin-right: 6px;
  border-radius: 50%;
  background: currentColor;
}
.connection-status.online {
  color: #9bf0d0;
  background: rgba(22, 163, 106, .13);
  border: 1px solid rgba(52, 211, 153, .28);
}
.connection-status.offline {
  color: #ffd3a7;
  background: rgba(249, 115, 22, .13);
  border: 1px solid rgba(251, 146, 60, .28);
}
.icon-button {
  min-height: 30px;
  padding: 5px 10px;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,.22);
  background: rgba(255,255,255,.08);
  color: #fff;
  font-size: .73rem;
  font-weight: 750;
}
.icon-button:hover { background: rgba(255,255,255,.14); }

.app-shell {
  width: min(1480px, calc(100% - 28px));
  margin: 14px auto 26px;
  display: grid;
  gap: 12px;
}

.control-bar {
  min-height: 50px;
  padding: 8px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  background: rgba(255,255,255,.94);
  border: 1px solid rgba(194, 208, 220, .9);
  border-radius: 12px;
  box-shadow: var(--shadow-tight);
}
.control-primary { display: flex; align-items: center; gap: 10px; min-width: 0; }
.module-badge {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 4px 9px;
  border-radius: 8px;
  background: var(--navy);
  color: #fff;
  font-size: .69rem;
  font-weight: 800;
  letter-spacing: .02em;
  white-space: nowrap;
}
.size-control {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  white-space: nowrap;
}
.size-control > span {
  font-size: .75rem;
  font-weight: 800;
  color: var(--muted-strong);
}
.size-control select {
  min-height: 32px;
  padding: 0 30px 0 9px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  font-weight: 750;
  font-size: .78rem;
}
.control-hint {
  color: var(--muted);
  font-size: .72rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.control-meta { display: flex; align-items: center; gap: 6px; }
.control-meta span {
  padding: 4px 7px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--muted-strong);
  font-size: .66rem;
  font-weight: 750;
  white-space: nowrap;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(430px, .88fr);
  gap: 12px;
  align-items: start;
}

.work-panel {
  background: rgba(255,255,255,.98);
  border: 1px solid rgba(194, 208, 220, .92);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.input-panel { padding: 16px; }
.result-panel {
  padding: 16px;
  position: sticky;
  top: 78px;
  max-height: calc(100vh - 94px);
  overflow: auto;
  scrollbar-width: thin;
}

.panel-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 11px;
  margin-bottom: 10px;
  border-bottom: 1px solid #e6edf2;
}
.panel-header h1, .panel-header h2 {
  margin: 0;
  font-size: 1.04rem;
  letter-spacing: -.025em;
}
.eyebrow {
  margin: 0 0 2px;
  color: var(--accent-strong);
  font-size: .63rem;
  font-weight: 850;
  letter-spacing: .12em;
}
.panel-help {
  max-width: 455px;
  margin: 0;
  color: var(--muted);
  line-height: 1.35;
  font-size: .73rem;
  text-align: right;
}

.equations-host { display: grid; gap: 5px; }
.equation-card {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  align-items: center;
  gap: 7px;
  min-height: 45px;
  padding: 5px 7px;
  border: 1px solid #e1e8ee;
  border-radius: 9px;
  background: linear-gradient(90deg, #fafcfd, #fff 40%);
}
.equation-card:hover { border-color: #cad7e1; }
.equation-title {
  margin: 0;
  display: grid;
  place-items: center;
  height: 31px;
  border-radius: 7px;
  background: #edf3f6;
  color: #46596c;
  font-size: .67rem;
  font-weight: 850;
  letter-spacing: .02em;
}
.equation-scroll {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 1px 0 3px;
  scrollbar-width: thin;
}
.equation-scroll:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 6px;
}
.equation-line {
  min-width: max-content;
  display: flex;
  align-items: center;
  gap: 5px;
}
.term { display: inline-flex; align-items: center; gap: 3px; }
.coefficient-input, .rhs-input {
  width: 58px;
  height: 32px;
  padding: 0 6px;
  border: 1px solid #afbfcc;
  border-radius: 7px;
  background: #fff;
  color: var(--ink);
  font-size: .78rem;
  font-weight: 650;
  font-variant-numeric: tabular-nums;
  text-align: right;
  transition: border-color 120ms ease, box-shadow 120ms ease, background 120ms ease;
}
.rhs-input {
  width: 66px;
  border-color: #8ea4b5;
  background: #f4f8fa;
  font-weight: 800;
}
.coefficient-input:focus, .rhs-input:focus, .size-control select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(11, 143, 131, .12);
}
.field-error {
  border-color: var(--danger) !important;
  background: var(--danger-soft) !important;
  box-shadow: 0 0 0 2px rgba(180,35,24,.08) !important;
}
.variable {
  min-width: 22px;
  font-family: "Cambria Math", Cambria, Georgia, serif;
  font-size: .94rem;
  font-style: italic;
  color: #25384b;
}
.operator, .equals {
  min-width: 10px;
  text-align: center;
  font-family: "Cambria Math", Cambria, Georgia, serif;
  font-size: .94rem;
  color: #53687a;
}
.equals { font-weight: 800; color: var(--navy-2); }

.form-message {
  min-height: 0;
  margin-top: 7px;
  padding: 0;
  border-radius: 8px;
  font-size: .73rem;
}
.form-message:not(:empty) { padding: 7px 9px; }
.form-message.neutral:not(:empty) { background: #f5f8fa; color: #526579; }
.form-message.success:not(:empty) { background: var(--success-soft); color: var(--success); }
.form-message.error:not(:empty) { background: var(--danger-soft); color: var(--danger); }

.panel-actions, .result-actions {
  display: flex;
  align-items: center;
  gap: 7px;
  flex-wrap: wrap;
}
.panel-actions {
  margin-top: 9px;
  padding-top: 10px;
  border-top: 1px solid #e7edf2;
}
.button {
  min-height: 34px;
  padding: 7px 12px;
  border-radius: 8px;
  border: 1px solid transparent;
  font-weight: 800;
  font-size: .76rem;
  transition: transform 100ms ease, background 120ms ease, border-color 120ms ease, box-shadow 120ms ease;
}
.button:active { transform: translateY(1px); }
.button:focus-visible { outline: 3px solid rgba(11,143,131,.19); outline-offset: 2px; }
.button.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #fff;
  box-shadow: 0 6px 15px rgba(11,143,131,.17);
}
.button.primary:hover { filter: brightness(.96); }
.button.primary-soft {
  background: var(--navy);
  color: #fff;
}
.button.secondary {
  background: #fff;
  color: var(--ink);
  border-color: #c9d5de;
}
.button.secondary:hover, .button.ghost:hover { background: #f4f8fa; }
.button.ghost { background: transparent; color: #5c6d7e; }
.button.compact { min-height: 29px; padding: 5px 9px; font-size: .69rem; }

.result-empty {
  min-height: 290px;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 6px;
  text-align: center;
  color: var(--muted);
}
.result-empty-mark {
  width: 84px;
  height: 84px;
  display: grid;
  place-items: center;
  margin-bottom: 5px;
  border-radius: 22px;
  background: linear-gradient(145deg, var(--navy), #123149);
  color: #89e5dc;
  font-family: "Cambria Math", Cambria, Georgia, serif;
  font-size: 1.2rem;
  font-style: italic;
  box-shadow: 0 15px 30px rgba(7,21,33,.16);
}
.result-empty strong { color: #34495c; }
.result-empty p { max-width: 390px; margin: 0; font-size: .76rem; line-height: 1.45; }

.result-hero {
  position: relative;
  overflow: hidden;
  padding: 14px;
  border-radius: 13px;
  background: linear-gradient(128deg, #071521 0%, #0b2836 72%, #0c3c42 100%);
  color: #fff;
  box-shadow: 0 12px 26px rgba(7,21,33,.14);
}
.result-hero::after {
  content: "";
  position: absolute;
  width: 180px;
  height: 180px;
  right: -72px;
  top: -92px;
  border-radius: 50%;
  background: rgba(43,199,184,.14);
}
.result-hero.success { border-left: 4px solid #2bd39a; }
.result-hero.infinite { border-left: 4px solid #66a3ff; }
.result-hero.inconsistent { border-left: 4px solid #ffae66; }
.result-kicker {
  position: relative;
  z-index: 1;
  margin: 0 0 2px;
  color: #7ee4d9;
  font-size: .62rem;
  font-weight: 850;
  letter-spacing: .13em;
}
.result-hero h3 {
  position: relative;
  z-index: 1;
  margin: 0;
  font-size: 1.16rem;
  letter-spacing: -.025em;
}
.result-lead {
  position: relative;
  z-index: 1;
  max-width: 520px;
  margin: 4px 0 0;
  color: #c6d4df;
  font-size: .75rem;
  line-height: 1.45;
}

.solution-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(116px, 1fr));
  gap: 6px;
  margin-top: 8px;
}
.solution-chip {
  min-width: 0;
  padding: 9px 10px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  border: 1px solid #dce6ec;
  border-radius: 9px;
  background: #fff;
}
.solution-chip span {
  font-family: "Cambria Math", Cambria, Georgia, serif;
  font-size: .9rem;
  font-style: italic;
  color: #4b6072;
}
.solution-chip strong {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: .88rem;
  font-variant-numeric: tabular-nums;
  color: var(--navy);
}

.verify-strip {
  margin-top: 8px;
  padding: 8px 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border-radius: 9px;
  background: var(--success-soft);
  border: 1px solid #c8ead8;
}
.verify-strip.warning { background: var(--warning-soft); border-color: #f0d4b7; }
.verify-main { display: flex; align-items: center; gap: 8px; min-width: 0; }
.verify-icon {
  width: 26px;
  height: 26px;
  flex: 0 0 26px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--success);
  color: #fff;
  font-weight: 900;
  font-size: .72rem;
}
.verify-strip.warning .verify-icon { background: var(--warning); }
.verify-main strong { display: block; font-size: .75rem; color: #244638; }
.verify-main span { display: block; color: #587067; font-size: .67rem; }
.verify-value { text-align: right; white-space: nowrap; }
.verify-value small { display: block; color: #6a7f75; font-size: .61rem; }
.verify-value strong { font-size: .72rem; font-variant-numeric: tabular-nums; }

.result-actions { margin-top: 8px; }
.result-actions .button { flex: 1 1 150px; }

.analysis-tabs {
  display: flex;
  gap: 3px;
  margin-top: 10px;
  padding: 3px;
  border: 1px solid #dce5eb;
  border-radius: 9px;
  background: #f3f7f9;
  overflow-x: auto;
  scrollbar-width: none;
}
.analysis-tabs::-webkit-scrollbar { display: none; }
.analysis-tab {
  flex: 0 0 auto;
  min-height: 29px;
  padding: 5px 9px;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: #5a6d7e;
  font-size: .67rem;
  font-weight: 800;
  white-space: nowrap;
}
.analysis-tab.active {
  background: #fff;
  color: var(--navy);
  box-shadow: 0 2px 8px rgba(7,21,33,.08);
}
.analysis-stage { margin-top: 8px; }
.analysis-panel { display: none; }
.analysis-panel.active { display: block; }

.summary-card {
  display: grid;
  gap: 8px;
}
.summary-text {
  margin: 0;
  color: var(--muted-strong);
  font-size: .74rem;
  line-height: 1.5;
}
.metric-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
}
.metric {
  padding: 8px 9px;
  border: 1px solid #e0e8ee;
  border-radius: 8px;
  background: #fafcfd;
}
.metric span { display: block; color: var(--muted); font-size: .61rem; }
.metric strong { display: block; margin-top: 2px; color: var(--navy); font-size: .75rem; font-variant-numeric: tabular-nums; }

.section-intro {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: .72rem;
  line-height: 1.45;
}
.verification-list { display: grid; gap: 6px; }
.verification-row {
  padding: 8px 9px;
  border: 1px solid #dde7ed;
  border-radius: 8px;
  background: #fbfdfd;
}
.verification-row-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 4px;
}
.verification-row-head strong { font-size: .71rem; }
.verification-ok {
  color: var(--success);
  font-size: .65rem;
  font-weight: 850;
}
.verification-equation {
  overflow-x: auto;
  padding-bottom: 2px;
  color: #24394b;
  font-family: "Cambria Math", Cambria, Georgia, serif;
  font-size: .76rem;
  line-height: 1.45;
  white-space: nowrap;
}

.matrix-scroll { overflow-x: auto; padding: 5px 2px; }
.matrix-table {
  border-collapse: separate;
  border-spacing: 0;
  min-width: max-content;
  margin: 0 auto;
  font-family: "Cambria Math", Cambria, Georgia, serif;
  font-size: .75rem;
  font-variant-numeric: tabular-nums;
}
.matrix-table td { padding: 5px 9px; text-align: right; border-top: 1px solid #edf1f4; border-bottom: 1px solid #edf1f4; }
.matrix-table tr:first-child td { border-top: 2px solid #697e8e; }
.matrix-table tr:last-child td { border-bottom: 2px solid #697e8e; }
.matrix-table td:first-child { border-left: 2px solid #697e8e; }
.matrix-table td:last-child { border-right: 2px solid #697e8e; }
.matrix-divider { border-left: 1px solid #8fa1af !important; background: #f5f8fa; font-weight: 800; }

.procedure-stack { display: grid; gap: 6px; }
.procedure-phase {
  padding: 8px 9px;
  border-radius: 8px;
  background: #edf5f7;
  color: #315461;
  font-size: .68rem;
  font-weight: 850;
  letter-spacing: .03em;
}
.step-card {
  border: 1px solid #dce6ec;
  border-radius: 8px;
  background: #fff;
  overflow: hidden;
}
.step-card > summary {
  padding: 8px 9px;
  cursor: pointer;
  font-size: .71rem;
  font-weight: 820;
  background: #f9fbfc;
}
.step-card[open] > summary { background: #f2f7f8; color: #173e45; }
.step-detail {
  margin: 0;
  padding: 8px 9px 0;
  color: var(--muted);
  font-size: .69rem;
  line-height: 1.45;
}
.step-equation {
  margin: 7px 9px 0;
  padding: 7px 8px;
  border-radius: 7px;
  background: #f6f9fa;
  color: #203747;
  font-family: "Cambria Math", Cambria, Georgia, serif;
  font-size: .73rem;
  overflow-x: auto;
  white-space: nowrap;
}
.matrix-pre {
  overflow-x: auto;
  margin: 7px 9px 9px;
  padding: 9px;
  border-radius: 7px;
  background: #0c1c29;
  color: #d7e3eb;
  font-family: "Cascadia Code", "SFMono-Regular", Consolas, monospace;
  font-size: .66rem;
  line-height: 1.5;
  tab-size: 4;
}

.technical-card {
  padding: 10px;
  border: 1px solid #dce6ec;
  border-radius: 9px;
  background: #fafcfd;
}
.technical-card h3 { margin: 0 0 5px; font-size: .78rem; }
.technical-card p { margin: 0; color: var(--muted); font-size: .69rem; line-height: 1.45; }
.technical-metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px;
  margin-top: 8px;
}

.app-footer {
  width: min(1480px, calc(100% - 28px));
  margin: 0 auto 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px 14px;
  flex-wrap: wrap;
  color: #6b7c8c;
  font-size: .66rem;
}
.footer-credit {
  color: #46596a;
}
.footer-credit strong {
  color: var(--ink);
}
.about-dialog strong {
  color: var(--ink);
}
.footer-link {
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--accent-strong);
  font-size: inherit;
  font-weight: 800;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.method-dialog {
  width: min(560px, calc(100% - 28px));
  max-height: min(86vh, 760px);
  overflow: auto;
  padding: 0;
  border: 1px solid #cfdbe4;
  border-radius: 15px;
  background: #fff;
  box-shadow: 0 28px 80px rgba(7,21,33,.28);
  color: var(--ink);
}
.method-dialog[open] { background: #fff; color: var(--ink); }
.method-dialog.dialog-fallback-open {
  position: fixed;
  inset: 50% auto auto 50%;
  transform: translate(-50%, -50%);
  z-index: 3001;
  display: block;
}
html.dialog-fallback-active::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 3000;
  background: rgba(4,13,20,.57);
  backdrop-filter: blur(2px);
}
.method-dialog::backdrop { background: rgba(4,13,20,.57); backdrop-filter: blur(2px); }
.dialog-header {
  padding: 14px 16px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 1px solid #e3eaef;
}
.dialog-header h2 { margin: 0; font-size: 1rem; }
.dialog-close {
  width: 30px;
  height: 30px;
  border: 0;
  border-radius: 8px;
  background: #eef3f6;
  font-size: 1.25rem;
}
.method-dialog > p { margin: 0; padding: 12px 16px 0; color: var(--muted); font-size: .75rem; line-height: 1.55; }
.method-dialog > p:last-child { padding-bottom: 16px; }

[hidden] { display: none !important; }

@media (max-width: 1120px) {
  .workspace { grid-template-columns: minmax(0, 1fr) minmax(380px, .8fr); }
  .control-hint { display: none; }
  .panel-help { max-width: 360px; }
}

@media (max-width: 900px) {
  .app-header { position: static; }
  .workspace { grid-template-columns: 1fr; }
  .result-panel { position: static; max-height: none; }
  .panel-help { max-width: 52%; }
}

@media (max-width: 680px) {
  .app-shell { width: min(100% - 16px, 1480px); margin-top: 8px; }
  .app-header { min-height: 58px; padding: 7px 9px; }
  .brand-icon { width: 40px; height: 40px; flex-basis: 40px; border-radius: 9px; }
  .brand-line strong { font-size: 1rem; }
  .brand-line span, .brand-copy p { display: none; }
  .connection-status { max-width: 145px; white-space: normal; line-height: 1.15; }
  .control-bar { align-items: flex-start; }
  .control-primary { flex-wrap: wrap; }
  .module-badge { display: none; }
  .control-meta { display: none; }
  .size-control { width: 100%; }
  .size-control select { flex: 1; }
  .input-panel, .result-panel { padding: 11px; border-radius: 13px; }
  .panel-header { display: grid; gap: 5px; }
  .panel-help { max-width: none; text-align: left; }
  .equation-card { grid-template-columns: 34px minmax(0,1fr); padding-inline: 5px; }
  .equation-title { height: 29px; }
  .coefficient-input { width: 54px; }
  .rhs-input { width: 62px; }
  .solution-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .metric-grid { grid-template-columns: repeat(2,1fr); }
  .technical-metrics { grid-template-columns: 1fr; }
  .app-footer { width: calc(100% - 16px); flex-wrap: wrap; gap: 7px; }
}

@media (max-width: 430px) {
  .header-actions .icon-button { display: none; }
  .connection-status { max-width: 120px; font-size: .65rem; }
  .panel-actions .button { flex: 1 1 0; }
  .result-actions { display: grid; grid-template-columns: 1fr; }
  .result-actions .button { width: 100%; }
  .verify-strip { align-items: flex-start; }
  .verify-value { display: none; }
  .analysis-tab { padding-inline: 8px; }
}

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

/* RR LinEc v0.3.1 --------------------------------------------------------- */
.module-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  min-height: 42px;
  padding: 5px;
  border: 1px solid rgba(194, 208, 220, .92);
  border-radius: 12px;
  background: rgba(255,255,255,.95);
  box-shadow: var(--shadow-tight);
  overflow-x: auto;
  scrollbar-width: none;
}
.module-nav::-webkit-scrollbar { display: none; }
.module-tab {
  flex: 0 0 auto;
  min-height: 31px;
  padding: 6px 11px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--muted-strong);
  font-size: .72rem;
  font-weight: 820;
  white-space: nowrap;
}
.module-tab.active {
  background: var(--navy);
  color: #fff;
  box-shadow: 0 4px 12px rgba(7,21,33,.15);
}
.module-tab.disabled { opacity: .48; cursor: default; }
.adaptive-badge {
  margin-left: auto;
  flex: 0 0 auto;
  padding: 5px 8px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: .64rem;
  font-weight: 800;
  white-space: nowrap;
}
.module-view { display: grid; gap: 12px; }
.module-view:not(.active) { display: none; }
.variable-summary {
  max-width: 235px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: #294457;
  font-family: "Cambria Math", Cambria, Georgia, serif;
  font-size: .77rem;
  font-style: italic;
  font-weight: 700;
}

.dialog-copy {
  margin: 0;
  padding: 12px 16px 4px;
  color: var(--muted);
  font-size: .74rem;
  line-height: 1.5;
}
.variable-dialog { width: min(590px, calc(100% - 24px)); }
.variable-fields {
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 8px;
  max-height: min(50vh, 390px);
  overflow: auto;
  padding: 10px 16px 4px;
}
.variable-field,
.field-block {
  display: grid;
  gap: 5px;
}
.variable-field > span,
.field-block > span {
  color: var(--muted-strong);
  font-size: .69rem;
  font-weight: 800;
}
.variable-field input,
.field-block input,
.field-block select {
  width: 100%;
  min-height: 38px;
  padding: 7px 9px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  font-size: .78rem;
}
.variable-field input:focus,
.field-block input:focus,
.field-block select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(11,143,131,.12);
}
.variable-dialog .form-message { margin: 8px 16px 0; }
.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  padding: 12px 16px 16px;
}

.function-field {
  grid-template-columns: auto minmax(0,1fr);
  align-items: center;
  gap: 8px;
}
.function-field > span {
  font-family: "Cambria Math", Cambria, Georgia, serif;
  font-size: 1rem;
  color: var(--navy);
}
.function-field input {
  min-height: 44px;
  font-family: "Cambria Math", Cambria, Georgia, serif;
  font-size: .94rem;
}
.field-help {
  display: block;
  margin: 5px 0 12px 45px;
  color: var(--muted);
  font-size: .67rem;
  line-height: 1.45;
}
.nonlinear-config-grid {
  display: grid;
  grid-template-columns: 1.35fr .85fr .85fr;
  gap: 8px;
  margin-top: 8px;
}
.nonlinear-parameters {
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 8px;
  margin-top: 8px;
  padding: 10px;
  border: 1px solid #e0e8ee;
  border-radius: 10px;
  background: #f8fbfc;
}
.nonlinear-param[hidden] { display: none !important; }
.nonlinear-metrics { margin-top: 8px; }
.iteration-table-wrap {
  overflow: auto;
  max-height: 430px;
  border: 1px solid #dce6ec;
  border-radius: 9px;
}
.iteration-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 500px;
  font-size: .69rem;
  font-variant-numeric: tabular-nums;
}
.iteration-table th,
.iteration-table td {
  padding: 7px 8px;
  text-align: right;
  border-bottom: 1px solid #e8eef2;
  white-space: nowrap;
}
.iteration-table th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: #eef4f7;
  color: #344b5e;
  font-weight: 850;
}
.iteration-table th:first-child,
.iteration-table td:first-child { text-align: center; }
.nonlinear-canvas {
  display: block;
  width: 100%;
  min-height: 250px;
  border: 1px solid #dce6ec;
  border-radius: 10px;
  background: #fff;
}

/* Adaptive profiles are capability/layout based; no user-agent detection. */
html[data-pointer="touch"] .button,
html[data-pointer="touch"] .icon-button,
html[data-pointer="touch"] .module-tab,
html[data-pointer="touch"] .analysis-tab {
  min-height: 44px;
}
html[data-pointer="touch"] .coefficient-input,
html[data-pointer="touch"] .rhs-input,
html[data-pointer="touch"] .field-block input,
html[data-pointer="touch"] .field-block select {
  min-height: 44px;
}

@media (max-width: 1024px) and (min-width: 681px) {
  html[data-device="tablet"] .workspace {
    grid-template-columns: 1fr;
  }
  html[data-device="tablet"] .result-panel {
    position: static;
    max-height: none;
  }
  html[data-device="tablet"][data-orientation="landscape"] .workspace {
    grid-template-columns: minmax(0, 1.04fr) minmax(380px, .96fr);
  }
  html[data-device="tablet"][data-orientation="landscape"] .result-panel {
    position: sticky;
    top: 78px;
    max-height: calc(100vh - 92px);
  }
}

@media (max-width: 680px) {
  .module-nav { border-radius: 10px; padding: 4px; }
  .adaptive-badge { display: none; }
  .variable-summary { max-width: calc(100vw - 150px); }
  .variable-fields { grid-template-columns: 1fr; }
  .dialog-actions { position: sticky; bottom: 0; background: #fff; border-top: 1px solid #e6edf2; }
  .function-field { grid-template-columns: 1fr; }
  .field-help { margin-left: 0; }
  .nonlinear-config-grid { grid-template-columns: 1fr 1fr; }
  .nonlinear-config-grid .field-block:first-child { grid-column: 1 / -1; }
  .nonlinear-parameters { grid-template-columns: 1fr 1fr; }
  .mobile-sticky-actions {
    position: sticky;
    bottom: 0;
    z-index: 8;
    margin: 10px -11px -11px;
    padding: 9px 11px max(9px, env(safe-area-inset-bottom));
    background: rgba(255,255,255,.96);
    backdrop-filter: blur(10px);
    border-top: 1px solid #dce6ec;
  }
  .mobile-sticky-actions .button { min-height: 46px; }
  .iteration-table-wrap { max-height: 55vh; }
}

@media (max-width: 430px) {
  .module-tab { padding-inline: 9px; }
  .variable-summary { width: 100%; max-width: none; order: 5; }
  .nonlinear-config-grid,
  .nonlinear-parameters { grid-template-columns: 1fr; }
  .nonlinear-config-grid .field-block:first-child { grid-column: auto; }
  .mobile-sticky-actions { display: grid; grid-template-columns: 1.3fr 1fr .85fr; }
  .mobile-sticky-actions .button { min-width: 0; padding-inline: 7px; }
}

/* v0.3.2 · auto-update, session recovery and telemetry */
.app-toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 1200;
  max-width: min(420px, calc(100vw - 28px));
  padding: 12px 14px;
  border-radius: 12px;
  background: #071521;
  color: #fff;
  border: 1px solid rgba(255,255,255,.14);
  box-shadow: 0 16px 50px rgba(7,21,33,.28);
  font-size: .88rem;
  line-height: 1.45;
}

.telemetry-consent {
  position: fixed;
  left: 50%;
  bottom: 16px;
  transform: translateX(-50%);
  z-index: 1150;
  width: min(760px, calc(100vw - 24px));
  display: grid;
  grid-template-columns: minmax(0,1fr) auto;
  align-items: center;
  gap: 18px;
  padding: 14px 16px;
  border-radius: 14px;
  background: rgba(7,21,33,.98);
  color: #fff;
  box-shadow: 0 20px 60px rgba(7,21,33,.34);
  border: 1px solid rgba(255,255,255,.12);
}

.telemetry-consent[hidden] { display: none !important; }
.telemetry-consent strong { display: block; margin-bottom: 3px; }
.telemetry-consent p { margin: 0; color: #cbd5e1; font-size: .82rem; line-height: 1.45; }
.telemetry-consent-actions { display: flex; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }

.about-status-grid {
  display: grid;
  grid-template-columns: repeat(2,minmax(0,1fr));
  gap: 10px;
  margin: 16px 0;
}
.about-status-grid > div {
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #f8fafc;
}
.about-status-grid span { display: block; color: var(--muted); font-size: .75rem; margin-bottom: 3px; }
.about-status-grid strong { font-size: .86rem; }
.privacy-copy { font-size: .86rem; color: var(--muted); line-height: 1.5; }
.telemetry-actions { margin: 12px 0 16px; }

@media (max-width: 680px) {
  .telemetry-consent {
    grid-template-columns: 1fr;
    gap: 12px;
    bottom: 8px;
  }
  .telemetry-consent-actions { justify-content: stretch; }
  .telemetry-consent-actions .button { flex: 1 1 0; }
  .about-status-grid { grid-template-columns: 1fr; }
  .app-toast { left: 10px; right: 10px; bottom: 10px; max-width: none; }
}


/* RR LinEc v0.3.2-r2: robust native Acerca de + visible save state */
.save-status {
  color: #0f766e;
  border-color: #99d9cf !important;
  background: #ecfdf8 !important;
}
.save-status[data-state="error"] {
  color: #b42318;
  border-color: #fecaca !important;
  background: #fff1f2 !important;
}
.native-overlay {
  position: fixed;
  inset: 0;
  z-index: 5000;
  display: none;
  place-items: center;
  padding: 14px;
}
.native-overlay:target { display: grid; }
.native-overlay-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(4,13,20,.60);
  backdrop-filter: blur(2px);
}
.native-overlay-card {
  position: relative;
  z-index: 1;
  width: min(620px, calc(100vw - 28px));
  max-height: min(88vh, 780px);
  overflow: auto;
  border: 1px solid #cfdbe4;
  border-radius: 15px;
  background: #fff;
  box-shadow: 0 28px 80px rgba(7,21,33,.32);
  color: var(--ink);
}
.native-overlay-body { padding: 0 16px 16px; }
.native-overlay-body > p { margin: 12px 0 0; color: var(--muted); font-size: .78rem; line-height: 1.6; }
.native-overlay-body strong { color: var(--ink); }
.dialog-close-link { display: grid; place-items: center; color: var(--ink); text-decoration: none; }
@media (max-width: 680px) {
  .native-overlay { padding: 8px; align-items: end; }
  .native-overlay-card { width: 100%; max-height: 91vh; border-radius: 16px 16px 10px 10px; }
}