:root {
  --bg: #e8eeed;
  --bg-strong: #d8e3e1;
  --panel: rgba(255, 252, 247, 0.92);
  --panel-strong: rgba(255, 255, 255, 0.96);
  --panel-dark: rgba(10, 26, 37, 0.92);
  --line: rgba(18, 46, 65, 0.12);
  --line-strong: rgba(18, 46, 65, 0.2);
  --ink: #122e41;
  --muted: #5f7383;
  --primary: #1f6671;
  --primary-strong: #103f47;
  --accent: #b96b3a;
  --accent-soft: rgba(185, 107, 58, 0.14);
  --success: #1f7a5a;
  --warning: #b67c2e;
  --danger: #b2463e;
  --shadow: 0 22px 52px rgba(18, 46, 65, 0.12);
  --radius-xl: 30px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --radius-sm: 12px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "IBM Plex Sans", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 11% 16%, rgba(31, 102, 113, 0.18), transparent 28%),
    radial-gradient(circle at 88% 11%, rgba(185, 107, 58, 0.12), transparent 24%),
    linear-gradient(160deg, #f4f1eb 0%, var(--bg) 46%, var(--bg-strong) 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(rgba(18, 46, 65, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(18, 46, 65, 0.03) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.92), transparent 96%);
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

a {
  color: inherit;
}

#app {
  position: relative;
  z-index: 1;
}

.app-shell {
  width: min(1500px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 24px 0 40px;
}

.hero,
.toolbar,
.workflow-panel,
.workspace-panel,
.panel-card,
.summary-card,
.metric-card,
.result-card,
.chart-card,
.equation-card,
.diagram-card,
.report-preview {
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(320px, 0.88fr);
  gap: 24px;
  padding: 28px;
  border-radius: var(--radius-xl);
  background:
    linear-gradient(145deg, rgba(9, 25, 37, 0.98), rgba(20, 67, 77, 0.94)),
    radial-gradient(circle at top right, rgba(255, 255, 255, 0.1), transparent 32%);
  color: #f1f7f8;
}

.eyebrow,
.section-tag,
.diagram-tag {
  margin: 0 0 12px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.17em;
  text-transform: uppercase;
}

.hero .eyebrow {
  color: rgba(180, 225, 231, 0.9);
}

.hero h1,
.section-heading h2,
.panel-heading h3,
.metric-card strong,
.result-card strong {
  margin: 0;
  font-family: "Space Grotesk", sans-serif;
  letter-spacing: -0.04em;
}

.hero h1 {
  font-size: clamp(2.5rem, 4.6vw, 4.5rem);
  line-height: 0.96;
}

.hero-subtitle {
  margin: 14px 0 0;
  max-width: 18ch;
  font-size: clamp(1.2rem, 2vw, 1.8rem);
  line-height: 1.14;
  color: #f6fbfc;
}

.hero-copy {
  margin: 18px 0 0;
  max-width: 64ch;
  color: rgba(232, 244, 246, 0.82);
  font-size: 1rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-top: 24px;
}

.button,
.module-chip,
.ghost-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 0.8rem 1.2rem;
  border-radius: 999px;
  border: none;
  text-decoration: none;
  transition: transform 160ms ease, box-shadow 160ms ease, background-color 160ms ease;
}

.button:hover,
.module-chip:hover,
.ghost-button:hover,
.button:focus-visible,
.module-chip:focus-visible,
.ghost-button:focus-visible {
  transform: translateY(-1px);
}

.button {
  background: linear-gradient(135deg, var(--accent), #8c4e2b);
  color: white;
  box-shadow: 0 14px 28px rgba(140, 78, 43, 0.22);
}

.ghost-button {
  background: rgba(255, 255, 255, 0.08);
  color: #edf7f8;
  border: 1px solid rgba(255, 255, 255, 0.16);
}

.hero-summary {
  display: grid;
  gap: 14px;
  align-content: start;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.metric-card {
  padding: 18px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.metric-card span {
  display: block;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(202, 232, 236, 0.78);
}

.metric-card strong {
  display: block;
  margin-top: 8px;
  font-size: 1.1rem;
  color: white;
}

.metric-card p {
  margin: 10px 0 0;
  color: rgba(223, 241, 243, 0.76);
  line-height: 1.55;
}

.toolbar {
  margin-top: 18px;
  padding: 16px 18px;
  border-radius: var(--radius-lg);
  background: var(--panel);
}

.toolbar-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: start;
}

.toolbar-copy h2 {
  margin: 4px 0 0;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.45rem;
}

.toolbar-copy p {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.6;
}

.module-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.module-chip {
  background: rgba(31, 102, 113, 0.08);
  color: var(--ink);
  border: 1px solid rgba(31, 102, 113, 0.12);
  font-weight: 600;
}

.module-chip.is-active {
  background: linear-gradient(135deg, var(--primary), var(--primary-strong));
  color: white;
  box-shadow: 0 14px 28px rgba(16, 63, 71, 0.16);
}

.toolbar-stats {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
}

.summary-card {
  padding: 16px;
  border-radius: 18px;
  background: var(--panel-strong);
}

.summary-card span {
  display: block;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.73rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--primary);
}

.summary-card strong {
  display: block;
  margin-top: 8px;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.2rem;
}

.summary-card p {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.5;
}

.workspace {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: 22px;
  align-items: start;
  margin-top: 18px;
}

.workflow-panel,
.workspace-panel {
  background: var(--panel);
  border-radius: var(--radius-lg);
}

.workflow-panel {
  position: sticky;
  top: 20px;
  padding: 20px;
  max-height: calc(100vh - 40px);
  overflow: auto;
}

.workflow-panel h3,
.workspace-panel h2,
.workspace-panel h3 {
  margin: 4px 0 0;
}

.workflow-panel p,
.workflow-panel li,
.panel-copy,
.section-description,
.result-subtitle,
.field-hint,
.report-copy {
  color: var(--muted);
  line-height: 1.58;
}

.workflow-list,
.module-notes {
  display: grid;
  gap: 10px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.workflow-list li,
.module-notes li {
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.56);
  overflow: hidden;
}

.workflow-list strong,
.module-notes strong {
  display: block;
  margin-bottom: 4px;
  color: var(--ink);
}

.workflow-link {
  display: block;
  width: 100%;
  padding: 12px 14px;
  border: none;
  border-radius: 14px;
  background: transparent;
  text-align: left;
  color: inherit;
}

.workflow-link strong,
.workflow-link span {
  display: block;
  overflow-wrap: anywhere;
}

.workflow-link:hover,
.workflow-link:focus-visible {
  background: rgba(31, 102, 113, 0.08);
  outline: none;
}

.workflow-actions {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.primary-action,
.secondary-action {
  min-height: 48px;
  border-radius: 16px;
  border: none;
  font-weight: 600;
}

.primary-action {
  background: linear-gradient(135deg, var(--primary), var(--primary-strong));
  color: white;
}

.secondary-action {
  background: rgba(31, 102, 113, 0.08);
  color: var(--primary-strong);
  border: 1px solid rgba(31, 102, 113, 0.12);
}

.workspace-panel {
  padding: 20px;
}

.section-stack {
  display: grid;
  gap: 16px;
}

.accordion-panel {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel-strong);
}

.accordion-panel[open] {
  box-shadow: var(--shadow);
}

.accordion-summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 14px;
  align-items: center;
  list-style: none;
  padding: 18px 20px;
  cursor: pointer;
}

.accordion-summary::-webkit-details-marker {
  display: none;
}

.accordion-index {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(31, 102, 113, 0.12), rgba(31, 102, 113, 0.04));
  color: var(--primary);
  font-family: "IBM Plex Mono", monospace;
  font-weight: 600;
}

.accordion-copy h3 {
  margin: 0;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.22rem;
}

.accordion-copy p {
  margin: 6px 0 0;
  color: var(--muted);
}

.accordion-chevron {
  width: 14px;
  height: 14px;
  border-right: 2px solid var(--primary);
  border-bottom: 2px solid var(--primary);
  transform: rotate(45deg);
  transition: transform 160ms ease;
}

.accordion-panel[open] .accordion-chevron {
  transform: rotate(225deg);
}

.accordion-body {
  padding: 0 20px 20px;
}

.panel-grid,
.analysis-grid,
.result-grid,
.diagram-grid,
.report-grid {
  display: grid;
  gap: 16px;
}

.panel-grid {
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
}

.analysis-grid,
.result-grid,
.diagram-grid,
.report-grid {
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
}

.panel-card,
.chart-card,
.equation-card,
.diagram-card,
.result-card,
.report-preview {
  padding: 18px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.72);
  min-width: 0;
  overflow: hidden;
}

.panel-heading {
  margin-bottom: 14px;
}

.panel-heading h3 {
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.08rem;
  overflow-wrap: anywhere;
}

.panel-heading p,
.section-heading p {
  margin: 6px 0 0;
  color: var(--muted);
}

.field-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.field-grid--three {
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field span {
  font-weight: 600;
  color: var(--ink);
}

.field small {
  color: var(--muted);
}

.field input,
.field select,
.field textarea {
  width: 100%;
  min-height: 46px;
  padding: 0.78rem 0.85rem;
  border-radius: 12px;
  border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.88);
  color: var(--ink);
}

.field textarea {
  min-height: 110px;
  resize: vertical;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: 2px solid rgba(31, 102, 113, 0.18);
  border-color: rgba(31, 102, 113, 0.32);
}

.kpi-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
}

.result-card strong {
  display: block;
  font-size: 1.35rem;
  line-height: 1;
}

.result-card span {
  display: block;
  margin-top: 6px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.75rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--primary);
}

.status-ok,
.status-review,
.status-ng {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0.45rem 0.7rem;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.84rem;
}

.status-ok {
  color: var(--success);
  background: rgba(31, 122, 90, 0.12);
}

.status-review {
  color: var(--warning);
  background: rgba(182, 124, 46, 0.12);
}

.status-ng {
  color: var(--danger);
  background: rgba(178, 70, 62, 0.12);
}

.table-scroll {
  overflow-x: auto;
}

.table-scroll table {
  min-width: 540px;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  padding: 0.85rem 0.7rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  overflow-wrap: anywhere;
}

th {
  font-size: 0.84rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary);
}

.equation-list {
  display: grid;
  gap: 14px;
}

.equation-card h4,
.diagram-card h4,
.report-preview h4 {
  margin: 0 0 8px;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.05rem;
}

.equation-render {
  overflow-x: auto;
  padding: 0.25rem 0 0.35rem;
}

.equation-render .katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  padding-bottom: 0.1rem;
}

.equation-section + .equation-section {
  margin-top: 12px;
}

.equation-label {
  display: block;
  margin-bottom: 6px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--primary);
}

.equation-copy {
  margin: 0;
  color: var(--muted);
}

.plot-surface,
.diagram-surface {
  min-height: 320px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(246, 249, 248, 0.9)),
    linear-gradient(180deg, rgba(31, 102, 113, 0.03), transparent);
  overflow: hidden;
}

.plot-surface .js-plotly-plot,
.plot-surface .plot-container,
.plot-surface .svg-container {
  width: 100% !important;
  height: 100% !important;
}

.diagram-surface {
  display: grid;
  place-items: center;
  padding: 12px;
}

.diagram-surface svg {
  width: 100%;
  height: auto;
}

.bullet-list {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--muted);
}

.bullet-list li + li {
  margin-top: 8px;
}

.report-preview {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(250, 244, 236, 0.84)),
    linear-gradient(145deg, var(--accent-soft), transparent 56%);
}

.report-meta {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.report-meta div {
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

.report-meta dt {
  margin: 0 0 4px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.11em;
  color: var(--primary);
}

.report-meta dd {
  margin: 0;
  color: var(--muted);
}

.footer-note {
  margin-top: 18px;
  font-size: 0.92rem;
  color: var(--muted);
  text-align: center;
}

@media (max-width: 1180px) {
  .hero,
  .workspace {
    grid-template-columns: 1fr;
  }

  .workflow-panel {
    position: static;
  }

  .toolbar-head,
  .toolbar-stats {
    grid-template-columns: 1fr;
  }

  .toolbar-stats {
    display: grid;
  }
}

@media (max-width: 860px) {
  .app-shell {
    width: min(calc(100vw - 24px), 1500px);
    padding-top: 12px;
  }

  .hero,
  .toolbar,
  .workflow-panel,
  .workspace-panel {
    padding: 18px;
  }

  .metric-grid,
  .toolbar-stats,
  .panel-grid,
  .analysis-grid,
  .result-grid,
  .diagram-grid,
  .report-grid,
  .kpi-strip,
  .field-grid,
  .field-grid--three {
    grid-template-columns: 1fr;
  }

  .accordion-summary {
    grid-template-columns: auto 1fr;
  }

  .accordion-chevron {
    justify-self: end;
  }
}