:root {
  --bg0: #e8eef3;
  --bg1: #f4f7fa;
  --ink: #12263a;
  --ink-soft: #3d5368;
  --line: #b7c7d6;
  --cyan: #0077a8;
  --cyan-deep: #005f86;
  --signal: #c45d1a;
  --paper: rgba(255, 255, 255, 0.72);
  --shadow: 0 18px 50px rgba(18, 38, 58, 0.08);
  --radius: 2px;
  --font-display: "Sora", system-ui, sans-serif;
  --font-body: "IBM Plex Sans", system-ui, sans-serif;
}

/* ── Dark theme ──────────────────────────────────────── */
[data-theme="dark"] {
  --bg0: #0d1117;
  --bg1: #161b22;
  --ink: #e6edf3;
  --ink-soft: #8b949e;
  --line: #30363d;
  --cyan: #58a6ff;
  --cyan-deep: #79c0ff;
  --signal: #f0883e;
  --paper: rgba(22, 27, 34, 0.85);
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] body {
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(88, 166, 255, 0.06), transparent 55%),
    radial-gradient(900px 500px at 90% 0%, rgba(240, 136, 62, 0.04), transparent 50%),
    linear-gradient(165deg, var(--bg1), var(--bg0));
}

[data-theme="dark"] .grain {
  opacity: 0.15;
}

[data-theme="dark"] .top {
  background: rgba(22, 27, 34, 0.85);
}

[data-theme="dark"] .canvas {
  background: #0d1117;
}

[data-theme="dark"] textarea {
  background: rgba(13, 17, 23, 0.8);
}

[data-theme="dark"] textarea:focus {
  outline-color: rgba(88, 166, 255, 0.4);
}

[data-theme="dark"] .beta-badge {
  background: var(--cyan);
  color: var(--bg0);
}

[data-theme="dark"] .c4-diagram-block {
  background: rgba(13, 17, 23, 0.8);
  border-color: var(--line);
}

[data-theme="dark"] .c4-diagram-block h3 {
  color: var(--ink-soft);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  color: var(--ink);
  font-family: var(--font-body);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(0, 119, 168, 0.12), transparent 55%),
    radial-gradient(900px 500px at 90% 0%, rgba(196, 93, 26, 0.08), transparent 50%),
    linear-gradient(165deg, var(--bg1), var(--bg0));
}

body {
  min-height: 100vh;
}

.grain {
  pointer-events: none;
  position: fixed;
  inset: 0;
  opacity: 0.35;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.45'/%3E%3C/svg%3E");
  mix-blend-mode: multiply;
  z-index: 0;
}

.top,
main,
.overlay {
  position: relative;
  z-index: 1;
}

.top {
  display: flex;
  flex-direction: column;
  padding: 0;
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
  background: rgba(244, 247, 250, 0.75);
}

.top-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 1.4rem;
}

.top-row.pipeline-row {
  padding: 0.45rem 1.4rem;
  border-top: 1px solid var(--line);
  justify-content: center;
}

.top-nav {
  display: flex;
  gap: 0.35rem;
  margin-left: 0.5rem;
}

.nav-link {
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-decoration: none;
  color: var(--cyan-deep);
  border: 1px solid var(--line);
  padding: 0.3rem 0.55rem;
  border-radius: var(--radius);
  transition: background 0.15s, border-color 0.15s;
}

.nav-link:hover {
  background: var(--bg1);
  border-color: var(--cyan);
}

.top-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
}

.logo {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  color: var(--ink);
  font-size: 0.95rem;
}

.steps {
  display: flex;
  gap: 0.35rem;
  margin: 0 auto;
}

.step {
  appearance: none;
  border: 1px solid transparent;
  background: transparent;
  color: var(--ink-soft);
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
  padding: 0.45rem 0.7rem;
  cursor: pointer;
  font: inherit;
  transition: color 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}

.step span {
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.step em {
  font-style: normal;
  font-size: 0.85rem;
}

.step.is-active {
  color: var(--ink);
  border-color: var(--line);
  background: var(--paper);
}

.step:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.token-meter {
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 0.32rem 0.55rem;
  white-space: nowrap;
  transition: border-color 0.25s ease, color 0.25s ease;
}

.token-meter.is-live {
  color: var(--ink);
  border-color: var(--cyan);
}

.token-meter .token-label {
  text-transform: uppercase;
  opacity: 0.75;
}

.token-meter strong {
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--cyan-deep);
}

.token-meter .token-last {
  font-size: 0.65rem;
  color: var(--ink-soft);
  max-width: 9rem;
  overflow: hidden;
  text-overflow: ellipsis;
}

.lang {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  padding: 0.4rem 0.65rem;
  font: 600 0.75rem var(--font-display);
  letter-spacing: 0.06em;
  cursor: pointer;
}

.demo-pill {
  font: 600 0.68rem var(--font-display);
  letter-spacing: 0.08em;
  color: var(--signal);
  border: 1px solid var(--signal);
  padding: 0.28rem 0.45rem;
}

.panel {
  display: none;
  animation: rise 0.55s ease both;
}

.panel.is-active {
  display: block;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.hero {
  max-width: 920px;
  margin: 0 auto;
  padding: clamp(3rem, 10vh, 6rem) 1.4rem 2rem;
  min-height: min(72vh, 640px);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.brand-mark {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.14em;
  font-size: clamp(2.4rem, 7vw, 4.8rem);
  line-height: 0.95;
  color: var(--ink);
  animation: brandIn 0.9s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

@keyframes brandIn {
  from {
    opacity: 0;
    letter-spacing: 0.28em;
    filter: blur(4px);
  }
  to {
    opacity: 1;
    letter-spacing: 0.14em;
    filter: none;
  }
}

.hero h1 {
  margin: 0;
  max-width: 16ch;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.35rem, 2.8vw, 1.85rem);
  line-height: 1.25;
}

.lede {
  margin: 1rem 0 0;
  max-width: 42ch;
  color: var(--ink-soft);
  font-size: 1.05rem;
  line-height: 1.55;
  animation: rise 0.7s 0.15s ease both;
}

.cta-row {
  margin-top: 1.6rem;
  animation: rise 0.7s 0.28s ease both;
}

.compose {
  max-width: 920px;
  margin: 0 auto 3rem;
  padding: 0 1.4rem 2rem;
  scroll-margin-top: 5rem;
}

.field-label {
  display: block;
  margin-bottom: 0.45rem;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-soft);
  font-weight: 600;
}

textarea {
  width: 100%;
  resize: vertical;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  padding: 0.9rem 1rem;
  font: 400 0.98rem/1.5 var(--font-body);
  box-shadow: var(--shadow);
  border-radius: var(--radius);
}

textarea:focus {
  outline: 2px solid rgba(0, 119, 168, 0.35);
  border-color: var(--cyan);
}

.md-editor {
  min-height: calc(100vh - 12rem);
  font-family: ui-monospace, "IBM Plex Mono", monospace;
  font-size: 0.86rem;
  line-height: 1.55;
}

.row-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 0.85rem;
}

.btn {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  padding: 0.7rem 1.1rem;
  font: 600 0.88rem var(--font-display);
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:disabled {
  opacity: 0.5;
  cursor: wait;
  transform: none;
}

.btn.primary {
  background: var(--cyan);
  border-color: var(--cyan-deep);
  color: #fff;
}

.btn.primary:hover {
  background: var(--cyan-deep);
}

.btn.ghost {
  background: transparent;
}

.hint {
  min-height: 1.25rem;
  margin: 0.75rem 0 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.split {
  display: grid;
  grid-template-columns: 1.35fr 0.9fr;
  gap: 1rem;
  padding: 1rem 1.4rem 2rem;
  min-height: calc(100vh - 4rem);
}

.col-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.1rem;
}

.col-head p {
  margin: 0.35rem 0 0.8rem;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.questions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1rem;
  max-height: 46vh;
  overflow: auto;
}

.q-card {
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 0.8rem 0.9rem;
}

.q-card .q-text {
  margin: 0 0 0.35rem;
  font-weight: 600;
}

.q-card .q-why {
  margin: 0 0 0.55rem;
  color: var(--ink-soft);
  font-size: 0.82rem;
}

.q-card input,
.q-card textarea {
  box-shadow: none;
}

.ready-badge {
  display: inline-block;
  margin-top: 0.75rem;
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--cyan);
  color: var(--cyan-deep);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.ready-badge.operator {
  border-color: var(--signal);
  color: var(--signal);
}

.btn.signal {
  background: transparent;
  border-color: var(--signal);
  color: var(--signal);
}

.btn.signal:hover {
  background: rgba(196, 93, 26, 0.08);
}

.case-ideas,
.saved-cases {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-top: 1rem;
  max-height: 28vh;
  overflow: auto;
}

.saved-cases-head {
  margin-top: 1.5rem;
}

.saved-cases-head h2 {
  font-size: 0.88rem;
  color: var(--ink-softer);
}

#caseSaveRow {
  margin-top: 0.8rem;
}

#caseSaveStatus {
  min-height: 1.2em;
}

.idea-card {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  justify-content: space-between;
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 0.75rem 0.85rem;
}

.idea-card p {
  margin: 0.35rem 0 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.idea-card .tag {
  margin-left: 0.4rem;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--cyan-deep);
}

.case-sequence {
  margin-top: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.seq-step {
  display: grid;
  grid-template-columns: 2.4rem 1fr;
  gap: 0.65rem;
  border-left: 2px solid var(--cyan);
  padding: 0.55rem 0.75rem;
  background: rgba(255, 255, 255, 0.55);
  animation: rise 0.45s ease both;
  animation-delay: calc(var(--i, 0) * 45ms);
}

.seq-step code {
  margin-left: 0.4rem;
  font-size: 0.75rem;
  color: var(--ink-soft);
}

.seq-step p {
  margin: 0.25rem 0 0;
  color: var(--ink-soft);
  font-size: 0.88rem;
}

.seq-idx {
  font-family: var(--font-display);
  font-size: 0.78rem;
  color: var(--cyan);
}

.narrative {
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--line);
  background: var(--paper);
  line-height: 1.5;
}

.end-state {
  margin: 0.5rem 0 0;
  font-size: 0.9rem;
}

.schema-issues {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-bottom: 0.85rem;
  max-height: 32vh;
  overflow: auto;
}

.issue-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.65rem;
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 0.75rem 0.85rem;
  cursor: pointer;
}

.issue-card.sev-warn {
  border-color: #c9a227;
}

.issue-card.sev-blocker {
  border-color: var(--signal);
}

.issue-card em {
  font-style: normal;
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--signal);
  margin-left: 0.35rem;
}

.issues-head {
  margin-top: 1.25rem;
}

.bpmn-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 1rem 1.4rem 0.4rem;
}

.bpmn-toolbar h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.15rem;
}

.bpmn-toolbar .row-actions {
  margin-top: 0;
}

.notes {
  padding: 0 1.4rem;
}

.canvas {
  height: calc(100vh - 10rem);
  margin: 0.5rem 1.4rem 1rem;
  border: 1px solid var(--line);
  background: #fcfdff;
  box-shadow: var(--shadow);
}

.canvas .djs-palette {
  background: var(--paper);
  border: 1px solid var(--line);
}

.overlay {
  position: fixed;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 0.75rem;
  background: rgba(232, 238, 243, 0.72);
  backdrop-filter: blur(6px);
  z-index: 20;
  text-align: center;
  font-family: var(--font-display);
}

.overlay[hidden] {
  display: none;
}

.spinner {
  width: 42px;
  height: 42px;
  margin: 0 auto;
  border: 2px solid var(--line);
  border-top-color: var(--cyan);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ── Sidebar ─────────────────────────────────────────── */
.sidebar-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(18, 38, 58, 0.25);
  backdrop-filter: blur(2px);
  z-index: 14;
}

.sidebar-backdrop[hidden] {
  display: none;
}

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 280px;
  background: var(--bg1);
  border-right: 1px solid var(--line);
  z-index: 15;
  display: flex;
  flex-direction: column;
  transform: translateX(-100%);
  transition: transform 0.3s ease;
  backdrop-filter: blur(10px);
}

.sidebar.is-open {
  transform: translateX(0);
}

.sidebar-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1rem;
  border-bottom: 1px solid var(--line);
}

.sidebar-head h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.sidebar-close {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--ink-soft);
  font-size: 1.1rem;
  cursor: pointer;
  padding: 0.25rem;
  line-height: 1;
}

.sidebar-close:hover {
  color: var(--ink);
}

.sidebar-list {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.sidebar-toggle {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  font-size: 1.1rem;
  padding: 0.35rem 0.5rem;
  cursor: pointer;
  line-height: 1;
  transition: background 0.2s ease;
}

.sidebar-toggle:hover {
  background: rgba(0, 119, 168, 0.08);
}

.history-item {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0.65rem 0.7rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.history-item:hover {
  background: var(--paper);
  border-color: var(--line);
}

.history-item.is-active {
  background: var(--paper);
  border-color: var(--cyan);
}

.history-item-body {
  flex: 1;
  min-width: 0;
}

.history-item-title {
  margin: 0;
  font-weight: 600;
  font-size: 0.85rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.history-item-desc {
  margin: 0.15rem 0 0;
  font-size: 0.78rem;
  color: var(--ink-soft);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.history-item-meta {
  margin: 0.2rem 0 0;
  font-size: 0.72rem;
  color: var(--ink-soft);
  display: flex;
  gap: 0.5rem;
}

.history-item-del {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--ink-soft);
  font-size: 0.8rem;
  cursor: pointer;
  padding: 0.2rem;
  opacity: 0;
  transition: opacity 0.2s ease, color 0.2s ease;
}

.history-item:hover .history-item-del {
  opacity: 1;
}

.history-item-del:hover {
  color: var(--signal);
}

/* ── Theme toggle ────────────────────────────────────── */
.theme-toggle {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  padding: 0.4rem 0.6rem;
  font-size: 1rem;
  cursor: pointer;
  line-height: 1;
  transition: background 0.2s ease, transform 0.2s ease;
}

.theme-toggle:hover {
  transform: translateY(-1px);
}

/* ── Templates panel ─────────────────────────────────── */
.templates-panel {
  margin-bottom: 0.85rem;
  border: 1px solid var(--line);
  background: var(--paper);
}

.templates-panel summary {
  padding: 0.6rem 0.9rem;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--cyan-deep);
  user-select: none;
  transition: background 0.2s ease;
}

.templates-panel summary:hover {
  background: rgba(0, 119, 168, 0.06);
}

.templates-panel[open] summary {
  border-bottom: 1px solid var(--line);
}

.templates-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding: 0.6rem 0.9rem 0;
}

.template-chip {
  appearance: none;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink-soft);
  padding: 0.3rem 0.6rem;
  font: 500 0.78rem var(--font-display);
  cursor: pointer;
  transition: all 0.2s ease;
}

.template-chip:hover,
.template-chip.is-active {
  border-color: var(--cyan);
  color: var(--cyan-deep);
  background: rgba(0, 119, 168, 0.06);
}

.templates-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 0.65rem;
  padding: 0.6rem 0.9rem 0.9rem;
  max-height: 42vh;
  overflow: auto;
}

.template-card {
  display: flex;
  gap: 0.65rem;
  align-items: flex-start;
  border: 1px solid var(--line);
  background: var(--bg1);
  padding: 0.7rem 0.8rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.template-card:hover {
  border-color: var(--cyan);
  background: var(--paper);
  transform: translateY(-1px);
}

.template-card .tpl-icon {
  font-size: 1.5rem;
  line-height: 1;
  flex-shrink: 0;
}

.template-card .tpl-body {
  flex: 1;
  min-width: 0;
}

.template-card .tpl-name {
  margin: 0;
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--ink);
}

.template-card .tpl-industry {
  margin: 0.1rem 0 0;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--cyan-deep);
}

.template-card .tpl-desc {
  margin: 0.3rem 0 0;
  font-size: 0.82rem;
  color: var(--ink-soft);
  line-height: 1.4;
}

/* ── Howto panel ─────────────────────────────────────── */
.howto-panel {
  margin-top: 1.5rem;
  border: 1px solid var(--line);
  background: var(--paper);
}

.howto-panel summary {
  padding: 0.75rem 1rem;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--cyan-deep);
  user-select: none;
  transition: background 0.2s ease;
}

.howto-panel summary:hover {
  background: rgba(0, 119, 168, 0.06);
}

.howto-panel[open] summary {
  border-bottom: 1px solid var(--line);
}

.howto-content {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.howto-step {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.howto-num {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 2.2rem;
  height: 2.2rem;
  font-family: "Sora", sans-serif;
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  background: var(--cyan);
  border-radius: 50%;
  flex-shrink: 0;
}

.howto-step strong {
  display: block;
  font-size: 0.9rem;
  margin-bottom: 0.2rem;
  color: var(--ink);
}

.howto-step p {
  margin: 0;
  font-size: 0.82rem;
  color: var(--ink-soft);
  line-height: 1.5;
}

.howto-tip {
  margin: 0.5rem 0 0;
  padding: 0.6rem 0.85rem;
  background: var(--cyan-glow);
  border-left: 3px solid var(--cyan);
  font-size: 0.82rem;
  color: var(--ink-soft);
}

/* ── Hints panel ─────────────────────────────────────── */
.hints-panel {
  margin-top: 0.65rem;
  border: 1px solid var(--line);
  background: var(--paper);
}

.hints-panel summary {
  padding: 0.6rem 0.9rem;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--cyan-deep);
  user-select: none;
  transition: background 0.2s ease;
}

.hints-panel summary:hover {
  background: rgba(0, 119, 168, 0.06);
}

.hints-panel[open] summary {
  border-bottom: 1px solid var(--line);
}

.hints-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  padding: 0.75rem 0.9rem;
}

.hint-group h4 {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.hint-group ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.hint-group li {
  margin-bottom: 0.3rem;
  font-size: 0.85rem;
  line-height: 1.45;
}

.hint-group code {
  font-family: ui-monospace, "IBM Plex Mono", monospace;
  font-size: 0.82rem;
  color: var(--cyan-deep);
  background: rgba(0, 119, 168, 0.07);
  padding: 0.1rem 0.35rem;
  border-radius: 2px;
}

.hint-group span {
  color: var(--ink-soft);
}

/* ── Validation results ──────────────────────────────── */
.validation-results {
  margin-top: 1.25rem;
}

.validation-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  max-height: 36vh;
  overflow: auto;
}

.validation-item {
  border: 1px solid var(--signal);
  background: rgba(196, 93, 26, 0.04);
  padding: 0.7rem 0.85rem;
  animation: rise 0.35s ease both;
}

.validation-item.sev-error {
  border-color: #c0392b;
  background: rgba(192, 57, 43, 0.05);
}

.validation-item.sev-warn {
  border-color: #c9a227;
  background: rgba(201, 162, 39, 0.05);
}

.validation-item.sev-ok {
  border-color: var(--cyan);
  background: rgba(0, 119, 168, 0.04);
}

.validation-item .v-title {
  margin: 0 0 0.3rem;
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--ink);
}

.validation-item.sev-error .v-title {
  color: #c0392b;
}

.validation-item.sev-warn .v-title {
  color: #8a6d00;
}

.validation-item .v-detail {
  margin: 0 0 0.35rem;
  font-size: 0.84rem;
  color: var(--ink-soft);
  line-height: 1.45;
}

.validation-item .v-fix {
  margin: 0;
  font-size: 0.82rem;
  color: var(--cyan-deep);
  font-weight: 500;
}

.validation-item .v-fix::before {
  content: "💡 ";
}

.validation-pass {
  border: 1px solid var(--cyan);
  background: rgba(0, 119, 168, 0.04);
  padding: 0.7rem 0.85rem;
  text-align: center;
  font-weight: 600;
  color: var(--cyan-deep);
  font-size: 0.88rem;
}

/* C4 Diagram Styles (beta) */
.beta-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-left: 0.35rem;
  padding: 0.1rem 0.35rem;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  background: var(--cyan);
  color: #fff;
  border-radius: 3px;
  vertical-align: middle;
  line-height: 1;
}

.c4-block {
  margin-top: 2rem;
  border: 1px solid var(--line);
  background: var(--paper);
}

.c4-block-header {
  padding: 1rem 1.25rem;
  cursor: pointer;
  list-style: none;
}

.c4-block-header::-webkit-details-marker {
  display: none;
}

.c4-block-header::before {
  content: "▸ ";
  font-size: 0.8rem;
  color: var(--ink-soft);
  transition: transform 0.2s;
}

.c4-block[open] .c4-block-header::before {
  content: "▾ ";
}

.c4-block-header h2 {
  display: inline;
  margin: 0;
  font-size: 1rem;
}

.c4-hint {
  padding: 0 1.25rem;
  margin: 0 0 1rem;
  color: var(--ink-soft);
  font-size: 0.88rem;
}

.c4-editor-row {
  padding: 0 1.25rem 1rem;
}

.c4-template {
  width: 100%;
  min-height: 200px;
  font-family: "SF Mono", "Fira Code", "Consolas", monospace;
  font-size: 0.82rem;
  line-height: 1.55;
  padding: 0.85rem;
  border: 1px solid var(--line);
  background: var(--bg0);
  color: var(--ink);
  resize: vertical;
  tab-size: 4;
}

.c4-template:focus {
  outline: 2px solid var(--cyan);
  outline-offset: -1px;
}

.c4-diagrams {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  padding: 0 1.25rem 1.5rem;
}

.c4-diagram-block {
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 1rem 1.25rem;
}

.c4-diagram-block h3 {
  margin: 0 0 0.75rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.c4-diagram-container {
  overflow-x: auto;
}

.c4-diagram-container .mermaid {
  margin: 0;
}

.c4-diagram-container svg {
  max-width: 100%;
  height: auto;
}

/* ── History diagram preview ─────────────────────────── */
.history-item-preview {
  margin: 0.35rem 0 0;
  border: 1px solid var(--line);
  background: #fcfdff;
  height: 72px;
  overflow: hidden;
  position: relative;
}

.history-item-preview svg {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.history-item-preview .preview-placeholder {
  display: grid;
  place-content: center;
  height: 100%;
  font-size: 0.72rem;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

@media (max-width: 900px) {
  .steps em {
    display: none;
  }

  .token-meter .token-last {
    display: none;
  }

  .split {
    grid-template-columns: 1fr;
  }

  .md-editor {
    min-height: 50vh;
  }

  .hero {
    min-height: auto;
    padding-top: 2.5rem;
  }

  .canvas {
    height: 70vh;
  }

  .top-nav {
    display: none;
  }

  .top-row {
    padding: 0.5rem 1rem;
    gap: 0.5rem;
  }

  .top-row.pipeline-row {
    padding: 0.35rem 1rem;
  }
}

/* ── Auth Area ──────────────────────────────────────── */
.auth-area {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: 0.5rem;
}

.auth-area .btn-sm {
  font-size: 0.75rem;
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  cursor: pointer;
  white-space: nowrap;
}

.auth-area .btn-sm:hover {
  background: var(--bg1);
}

.auth-user {
  font-size: 0.75rem;
  color: var(--ink-soft);
  white-space: nowrap;
}

/* ── Login Modal ────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0, 0, 0, 0.45);
  display: grid;
  place-items: center;
  backdrop-filter: blur(4px);
}

.modal-overlay[hidden] {
  display: none;
}

.modal-box {
  background: var(--bg1);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 2rem;
  width: 340px;
  max-width: 90vw;
  box-shadow: var(--shadow);
}

.modal-box h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 1.25rem;
}

.modal-field {
  margin-bottom: 1rem;
}

.modal-field label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--ink-soft);
  margin-bottom: 0.3rem;
}

.modal-field input {
  width: 100%;
  padding: 0.55rem 0.75rem;
  font-size: 0.9rem;
  font-family: var(--font-body);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg0);
  color: var(--ink);
  outline: none;
  box-sizing: border-box;
}

.modal-field input:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 2px rgba(0, 119, 168, 0.15);
}

.modal-error {
  font-size: 0.8rem;
  color: var(--signal);
  margin-bottom: 0.75rem;
}

.modal-error[hidden] {
  display: none;
}

.modal-actions {
  display: flex;
  gap: 0.5rem;
  justify-content: flex-end;
  margin-top: 1.25rem;
}

[data-theme="dark"] .auth-area .btn-sm {
  background: var(--bg1);
  border-color: var(--line);
  color: var(--ink);
}

[data-theme="dark"] .auth-area .btn-sm:hover {
  background: var(--bg0);
}

[data-theme="dark"] .modal-box {
  background: var(--bg1);
  border-color: var(--line);
}

[data-theme="dark"] .modal-field input {
  background: var(--bg0);
  border-color: var(--line);
  color: var(--ink);
}

/* ── Beta Badge Small ─────────────────────────── */
.beta-badge-sm {
  display: inline-block;
  font-size: 0.55rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 0.05rem 0.3rem;
  border-radius: 2px;
  background: var(--signal);
  color: #fff;
  vertical-align: super;
  line-height: 1;
  margin-left: 0.15rem;
}

/* ── C4 Link Block ────────────────────────────── */
.c4-link-block {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: center;
}

.c4-link-block .btn {
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}