/* MIZ OKI 3.5 — Executive Briefing design system
   Premium dark, decision-grade. No CDN dependency. */

:root {
  --bg: #0A1418;
  --bg-elevated: #0B1E26;
  --bg-subtle: #123039;
  --bg-muted: #16323C;
  --fg: #F4F6F7;
  --fg-muted: #93A0A6;
  --fg-subtle: #5E6E75;
  --border: color-mix(in oklab, var(--fg) 12%, transparent);
  --border-strong: color-mix(in oklab, var(--fg) 22%, transparent);
  --accent: #3FDCF2;
  --accent-fg: #06262C;
  --signal: #41D695;
  --signal-fg: #052e1c;
  --warn: #D9A83C;
  --danger: #FF6B7C;
  --info: #8FC2E8;
  --radius-sm: 2px;
  --radius-md: 2px;
  --radius-lg: 2px;
  --radius-xl: 2px;
  --font-sans: "DM Sans", ui-sans-serif, system-ui, -apple-system, sans-serif;
  --font-display: "Instrument Serif", Georgia, "Times New Roman", serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --shadow: none;
  --motion-fast: 250ms;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --max: 72rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  border-color: var(--border);
}

html {
  color-scheme: dark;
  -webkit-font-smoothing: antialiased;
}

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.5;
}

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.4;
}

#mizoki-briefing {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* Header */
.mb-header {
  position: sticky;
  top: 0;
  z-index: 40;
  border-bottom: 1px solid var(--border);
  background: color-mix(in oklab, var(--bg) 88%, transparent);
  backdrop-filter: blur(12px);
}

.mb-header-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.mb-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 0;
}

.mb-mark {
  width: 2rem;
  height: 2rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--bg-elevated);
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 500;
  flex-shrink: 0;
}

.mb-brand-text strong {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.mb-brand-text span {
  display: block;
  font-size: 0.75rem;
  color: var(--fg-subtle);
}

.mb-ghost {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  height: 2.25rem;
  padding: 0 0.875rem;
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  color: var(--fg-subtle);
  font-size: 0.8125rem;
  transition: color var(--motion-fast) var(--ease), background var(--motion-fast) var(--ease);
}

.mb-ghost:hover {
  color: var(--fg);
  background: var(--bg-subtle);
}

/* Progress */
.mb-progress {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1rem 0.75rem;
}

.mb-stages {
  display: flex;
  gap: 0.25rem;
  overflow-x: auto;
  padding-bottom: 0.25rem;
  scrollbar-width: thin;
}

.mb-stage-btn {
  flex: 1;
  min-width: 7.5rem;
  text-align: left;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: transparent;
  padding: 0.5rem 0.625rem;
  transition: background var(--motion-fast) var(--ease), border-color var(--motion-fast) var(--ease);
}

.mb-stage-btn:hover:not(:disabled) {
  background: var(--bg-subtle);
}

.mb-stage-btn.is-active {
  border-color: var(--border-strong);
  background: var(--bg-elevated);
}

.mb-stage-btn.is-done:not(.is-active) {
  background: color-mix(in oklab, var(--bg-subtle) 60%, transparent);
}

.mb-stage-btn:disabled {
  opacity: 0.4;
}

.mb-stage-meta {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.08em;
  color: var(--fg-subtle);
}

.mb-stage-btn.is-active .mb-stage-meta {
  color: var(--fg);
}

.mb-stage-label {
  display: block;
  margin-top: 0.25rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--fg-muted);
  line-height: 1.25;
}

.mb-stage-btn.is-active .mb-stage-label {
  color: var(--fg);
}

.mb-stage-bar {
  margin-top: 0.375rem;
  height: 2px;
  border-radius: 999px;
  background: var(--bg-muted);
  overflow: hidden;
}

.mb-stage-bar > span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--accent);
  transition: width var(--motion-fast) var(--ease);
}

.mb-stage-btn.is-active .mb-stage-bar > span,
.mb-stage-btn.is-done .mb-stage-bar > span {
  width: 100%;
}

.mb-purpose {
  margin: 0.5rem 0 0;
  font-size: 0.8125rem;
  color: var(--fg-subtle);
}

/* Main */
.mb-main {
  flex: 1;
  max-width: var(--max);
  margin: 0 auto;
  width: 100%;
  padding: 2rem 1rem 3rem;
}

.mb-footer {
  border-top: 1px solid var(--border);
  padding: 1rem;
}

.mb-footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-size: 0.75rem;
  color: var(--fg-subtle);
}

@media (min-width: 640px) {
  .mb-header-inner,
  .mb-progress,
  .mb-main {
    padding-left: 1.5rem;
    padding-right: 1.5rem;
  }
  .mb-footer-inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    padding: 0 0.5rem;
  }
}

/* Typography helpers */
.mb-kicker {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fg-subtle);
  margin: 0 0 0.5rem;
}

.mb-title {
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin: 0;
  text-wrap: balance;
}

.mb-title-lg {
  font-size: clamp(2rem, 4vw, 3.25rem);
}

.mb-title-md {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
}

.mb-lead {
  margin: 0.875rem 0 0;
  max-width: 36rem;
  color: var(--fg-muted);
  line-height: 1.6;
}

.mb-section-title {
  margin: 0;
  font-size: 0.875rem;
  font-weight: 500;
}

.mb-hint {
  margin: 0.25rem 0 0;
  font-size: 0.75rem;
  color: var(--fg-subtle);
}

/* Buttons */
.mb-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 2.75rem;
  padding: 0 1.25rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-size: 0.875rem;
  font-weight: 500;
  transition: background var(--motion-fast) var(--ease), border-color var(--motion-fast) var(--ease),
    transform 120ms var(--ease), opacity var(--motion-fast) var(--ease);
}

.mb-btn:active:not(:disabled) {
  transform: scale(0.98);
}

.mb-btn-primary {
  background: var(--accent);
  color: var(--accent-fg);
}

.mb-btn-primary:hover:not(:disabled) {
  background: color-mix(in oklab, var(--accent) 88%, white);
}

.mb-btn-secondary {
  background: var(--bg-subtle);
  border-color: var(--border);
  color: var(--fg);
}

.mb-btn-secondary:hover:not(:disabled) {
  background: var(--bg-muted);
  border-color: var(--border-strong);
}

.mb-btn-signal {
  background: var(--signal);
  color: var(--signal-fg);
}

.mb-btn-signal:hover:not(:disabled) {
  background: color-mix(in oklab, var(--signal) 90%, white);
}

.mb-btn-lg {
  min-height: 3rem;
  padding: 0 1.5rem;
  font-size: 1rem;
}

.mb-btn-sm {
  min-height: 2.25rem;
  padding: 0 0.875rem;
  font-size: 0.75rem;
}

.mb-btn-block {
  width: 100%;
}

@media (min-width: 640px) {
  .mb-btn-block-sm {
    width: auto;
  }
}

/* Cards / panels */
.mb-panel {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  padding: 1.25rem;
}

@media (min-width: 640px) {
  .mb-panel {
    padding: 1.5rem;
  }
}

.mb-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg-elevated);
  padding: 1rem 1.125rem;
}

.mb-card-muted {
  background: color-mix(in oklab, var(--bg-subtle) 40%, transparent);
}

.mb-card-select {
  width: 100%;
  text-align: left;
  cursor: pointer;
  transition: background var(--motion-fast) var(--ease), border-color var(--motion-fast) var(--ease);
}

.mb-card-select:hover {
  background: var(--bg-subtle);
}

.mb-card-select.is-selected {
  border-color: var(--border-strong);
  background: var(--bg-elevated);
}

/* Layout grids */
.mb-grid-2 {
  display: grid;
  gap: 1rem;
}

.mb-grid-3 {
  display: grid;
  gap: 1rem;
}

.mb-grid-domains {
  display: grid;
  gap: 0.5rem;
}

@media (min-width: 640px) {
  .mb-grid-domains {
    grid-template-columns: 1fr 1fr;
  }
  .mb-grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 960px) {
  .mb-grid-2 {
    grid-template-columns: 1.1fr 0.9fr;
  }
  .mb-grid-live {
    grid-template-columns: 0.95fr 1.05fr;
  }
  .mb-grid-case {
    grid-template-columns: 1.1fr 0.9fr;
  }
}

.mb-stack {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.mb-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.mb-actions {
  margin-top: 2rem;
  display: flex;
  flex-direction: column-reverse;
  gap: 0.75rem;
}

@media (min-width: 640px) {
  .mb-actions {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

/* Chips */
.mb-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-subtle);
  padding: 0.25rem 0.625rem;
  font-size: 0.6875rem;
  color: var(--fg-muted);
}

.mb-sev {
  display: inline-flex;
  border-radius: 999px;
  border: 1px solid;
  padding: 0.125rem 0.5rem;
  font-size: 0.625rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.mb-sev-critical {
  color: var(--danger);
  border-color: color-mix(in oklab, var(--danger) 30%, transparent);
  background: color-mix(in oklab, var(--danger) 10%, transparent);
}

.mb-sev-watch {
  color: var(--warn);
  border-color: color-mix(in oklab, var(--warn) 30%, transparent);
  background: color-mix(in oklab, var(--warn) 10%, transparent);
}

.mb-sev-info {
  color: var(--info);
  border-color: color-mix(in oklab, var(--info) 30%, transparent);
  background: color-mix(in oklab, var(--info) 10%, transparent);
}

/* Forms */
.mb-input {
  width: 100%;
  height: 2.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-subtle);
  color: var(--fg);
  padding: 0 0.875rem;
  font: inherit;
  font-size: 0.875rem;
}

.mb-input:focus {
  outline: none;
  border-color: var(--border-strong);
  box-shadow: 0 0 0 2px color-mix(in oklab, var(--accent) 35%, transparent);
}

.mb-input::placeholder {
  color: var(--fg-subtle);
}

/* Live progress */
.mb-live-progress {
  height: 4px;
  border-radius: 999px;
  background: var(--bg-muted);
  overflow: hidden;
  margin: 1rem 0 1.5rem;
}

.mb-live-progress > span {
  display: block;
  height: 100%;
  background: var(--signal);
  transition: width var(--motion-fast) var(--ease);
}

.mb-metric {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.5vw, 1.875rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  margin: 0.25rem 0 0;
}

.mb-metric-lg {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
}

.mb-signal-box {
  border: 1px solid color-mix(in oklab, var(--signal) 25%, transparent);
  background: color-mix(in oklab, var(--signal) 8%, transparent);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
}

.mb-signal-box p {
  margin: 0.35rem 0 0;
}

.mb-list-plain {
  list-style: none;
  margin: 0;
  padding: 0;
}

.mb-list-plain li {
  display: flex;
  gap: 0.75rem;
  font-size: 0.875rem;
  color: var(--fg-muted);
  line-height: 1.5;
}

.mb-list-plain li + li {
  margin-top: 0.75rem;
}

.mb-dot {
  width: 4px;
  height: 4px;
  border-radius: 999px;
  background: var(--fg-subtle);
  margin-top: 0.55rem;
  flex-shrink: 0;
}

.mb-check {
  width: 1rem;
  height: 1rem;
  flex-shrink: 0;
  margin-top: 0.15rem;
  color: var(--signal);
}

/* Welcome */
.mb-welcome {
  display: grid;
  gap: 3rem;
}

@media (min-width: 960px) {
  .mb-welcome {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: end;
  }
}

.mb-process-list {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
}

.mb-process-list li {
  position: relative;
  display: flex;
  gap: 0.75rem;
  padding-bottom: 1.25rem;
}

.mb-process-list li:last-child {
  padding-bottom: 0;
}

.mb-process-list li:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 11px;
  top: 1.5rem;
  bottom: 0;
  width: 1px;
  background: var(--border);
}

.mb-step-num {
  position: relative;
  z-index: 1;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: var(--bg-subtle);
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: var(--fg-muted);
  flex-shrink: 0;
}

.mb-hidden {
  display: none !important;
}

.mb-enter {
  animation: mb-enter var(--motion-fast) var(--ease) both;
}

@keyframes mb-enter {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .mb-enter {
    animation: none;
  }
}

/* Icon inline */
.mb-icon {
  width: 1rem;
  height: 1rem;
  flex-shrink: 0;
}

.mb-icon-lg {
  width: 1.25rem;
  height: 1.25rem;
}

.mb-domain-icon {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg);
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.mb-card-select.is-selected .mb-domain-icon {
  border-color: var(--border-strong);
  background: var(--bg-muted);
}

.mb-mono {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: var(--fg-subtle);
}

.mb-text-signal {
  color: var(--signal);
}

.mb-text-muted {
  color: var(--fg-muted);
}

.mb-text-subtle {
  color: var(--fg-subtle);
}

.mb-mt-1 {
  margin-top: 0.25rem;
}
.mb-mt-2 {
  margin-top: 0.5rem;
}
.mb-mt-3 {
  margin-top: 0.75rem;
}
.mb-mt-4 {
  margin-top: 1rem;
}
.mb-mt-6 {
  margin-top: 1.5rem;
}
.mb-mt-8 {
  margin-top: 2rem;
}