/* ============================================================
   OpenIntent Docs — Design System v4
   Light, readable, clean grayscale
   ============================================================ */

:root {
  --oi-surface: #ffffff;
  --oi-surface-raised: #f9f9f9;
  --oi-surface-sunken: #f4f4f5;

  --oi-text-primary: #18181b;
  --oi-text-secondary: #52525b;
  --oi-text-tertiary: #a1a1aa;

  --oi-border: #e4e4e7;
  --oi-border-light: #f0f0f2;

  --oi-radius-sm: 6px;
  --oi-radius-md: 8px;
  --oi-radius-lg: 12px;

  --md-primary-fg-color: #18181b;
  --md-primary-fg-color--light: #3f3f46;
  --md-primary-fg-color--dark: #09090b;
  --md-accent-fg-color: #3f3f46;
  --md-accent-fg-color--transparent: rgba(63,63,70,0.1);
}

[data-md-color-scheme="slate"] {
  --oi-surface: #18181b;
  --oi-surface-raised: #1f1f23;
  --oi-surface-sunken: #111114;

  --oi-text-primary: #fafafa;
  --oi-text-secondary: #a1a1aa;
  --oi-text-tertiary: #71717a;

  --oi-border: #27272a;
  --oi-border-light: #1f1f23;

  --md-default-bg-color: #18181b;
  --md-default-fg-color: #fafafa;
  --md-default-fg-color--light: #a1a1aa;
  --md-default-fg-color--lighter: #71717a;
  --md-primary-fg-color: #fafafa;
  --md-primary-fg-color--light: #d4d4d8;
  --md-primary-fg-color--dark: #fafafa;
}


/* --- Typography --- */

.md-typeset {
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--oi-text-primary);
  -webkit-font-smoothing: antialiased;
}

.md-typeset h1 {
  font-weight: 600;
  font-size: 1.6em;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 0.6em;
  color: var(--oi-text-primary);
}

.md-typeset h2 {
  font-weight: 600;
  font-size: 1.25em;
  letter-spacing: -0.015em;
  line-height: 1.3;
  margin-top: 2em;
  margin-bottom: 0.5em;
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--oi-border-light);
}

.md-typeset h3 {
  font-weight: 600;
  font-size: 1.05em;
  letter-spacing: -0.01em;
  line-height: 1.4;
  margin-top: 1.6em;
}

.md-typeset h4 {
  font-weight: 600;
  font-size: 0.92em;
}

.md-typeset p {
  margin-bottom: 1.1em;
}

.md-typeset a {
  color: var(--oi-text-primary);
  text-decoration: underline;
  text-decoration-color: var(--oi-border);
  text-underline-offset: 3px;
  transition: text-decoration-color 0.15s ease;
}

.md-typeset a:hover {
  text-decoration-color: var(--oi-text-secondary);
}

.md-content {
  max-width: 52rem;
}


/* --- Code --- */

.md-typeset code {
  font-family: "IBM Plex Mono", "JetBrains Mono", monospace;
  font-size: 0.84em;
  border-radius: 4px;
  padding: 0.15em 0.4em;
  background: var(--oi-surface-sunken);
  border: 1px solid var(--oi-border);
  color: var(--oi-text-primary);
  font-variant-ligatures: none;
}

.md-typeset pre {
  border-radius: var(--oi-radius-md);
  border: 1px solid var(--oi-border);
  overflow: hidden;
}

.md-typeset pre > code {
  font-size: 0.82em;
  line-height: 1.7;
  padding: 1.1em 1.3em;
  background: var(--oi-surface-sunken);
  border: none;
  border-radius: 0;
  color: var(--oi-text-primary);
  display: block;
}

.md-typeset pre > code::-webkit-scrollbar {
  height: 5px;
}

.md-typeset pre > code::-webkit-scrollbar-thumb {
  background: var(--oi-border);
  border-radius: 3px;
}

.md-clipboard {
  color: var(--oi-text-tertiary) !important;
  transition: color 0.15s ease;
}

.md-clipboard:hover {
  color: var(--oi-text-primary) !important;
}


/* --- Admonitions --- */

.md-typeset .admonition,
.md-typeset details {
  border-radius: var(--oi-radius-md);
  border: 1px solid var(--oi-border);
  border-left: 3px solid var(--oi-text-tertiary);
  overflow: hidden;
  margin: 1.4em 0;
  font-size: 0.94em;
}

.md-typeset .admonition .admonition-title,
.md-typeset details summary {
  font-weight: 600;
  font-size: 0.88em;
  padding: 0.6em 1em;
  border-bottom: 1px solid var(--oi-border-light);
}

.md-typeset .admonition > :last-child,
.md-typeset details > :last-child {
  margin-bottom: 0.7em;
}


/* --- Tables --- */

.md-typeset table:not([class]) {
  border-radius: var(--oi-radius-md);
  overflow: hidden;
  border: 1px solid var(--oi-border);
  border-collapse: separate;
  border-spacing: 0;
  width: 100%;
  font-size: 0.9em;
}

.md-typeset table:not([class]) thead {
  background: var(--oi-surface-raised);
}

.md-typeset table:not([class]) th {
  font-weight: 600;
  font-size: 0.82em;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--oi-text-secondary);
  padding: 0.7em 1em;
  border-bottom: 1px solid var(--oi-border);
  text-align: left;
}

.md-typeset table:not([class]) td {
  padding: 0.6em 1em;
  border-bottom: 1px solid var(--oi-border-light);
  vertical-align: top;
}

.md-typeset table:not([class]) tbody tr:last-child td {
  border-bottom: none;
}


/* --- Navigation --- */

.md-nav__link {
  font-size: 0.82rem;
}

.md-nav__item--active > .md-nav__link {
  font-weight: 600;
  color: var(--oi-text-primary) !important;
}

.md-tabs__link {
  font-weight: 500;
  font-size: 0.8rem;
  letter-spacing: 0.01em;
  opacity: 0.7;
  transition: opacity 0.15s ease;
}

.md-tabs__link--active,
.md-tabs__link:hover {
  opacity: 1;
}

.md-header {
  box-shadow: 0 1px 0 var(--oi-border);
}

[data-md-color-scheme="slate"] .md-header {
  background: #18181b;
  box-shadow: 0 1px 0 var(--oi-border);
}

[data-md-color-scheme="slate"] .md-tabs {
  background: #18181b;
}

[data-md-color-scheme="slate"] .md-tabs__link {
  color: #d4d4d8;
}

[data-md-color-scheme="slate"] .md-tabs__link--active {
  color: #fafafa;
}

[data-md-color-scheme="slate"] .md-header__topic {
  color: #fafafa;
}

[data-md-color-scheme="slate"] .md-header .md-icon {
  color: #d4d4d8;
}

[data-md-color-scheme="slate"] .md-search__input {
  background: #27272a;
  color: #fafafa;
}


/* --- Content Tabs --- */

.md-typeset .tabbed-set {
  border-radius: var(--oi-radius-md);
  border: 1px solid var(--oi-border);
  overflow: hidden;
  margin: 1.4em 0;
}

.md-typeset .tabbed-labels {
  background: var(--oi-surface-raised);
  border-bottom: 1px solid var(--oi-border);
}

.md-typeset .tabbed-labels > label {
  font-weight: 500;
  font-size: 0.84em;
  padding: 0.6em 1.1em;
  opacity: 0.5;
  transition: opacity 0.15s ease;
}

.md-typeset .tabbed-labels > label:hover {
  opacity: 0.8;
}

.md-typeset .tabbed-labels > .tabbed-labels__active {
  opacity: 1;
}

.md-typeset .tabbed-content {
  padding: 0;
}


/* --- Search --- */

.md-search__form {
  border-radius: var(--oi-radius-md);
}

.md-search-result__meta {
  font-size: 0.78em;
  color: var(--oi-text-tertiary);
}


/* --- Footer --- */

.md-footer {
  border-top: 1px solid var(--oi-border);
}


/* --- Announcement Bar --- */

.md-banner {
  background: #27272a;
  color: rgba(255,255,255,0.85);
  font-size: 0.78em;
  font-weight: 500;
}

.md-banner a {
  color: #ffffff;
  text-decoration: underline;
  text-underline-offset: 2px;
}

[data-md-color-scheme="slate"] .md-banner {
  background: #27272a;
  border-bottom: 1px solid #3f3f46;
}


/* --- Mermaid --- */

.md-typeset .mermaid {
  text-align: center;
  margin: 1.4em 0;
}


/* ============================================================
   HOMEPAGE — Full-width, no sidebar
   ============================================================ */

@media (min-width: 76.25em) {
  .oi-home .md-sidebar--primary {
    display: none !important;
  }
}

.oi-home .md-sidebar--secondary {
  display: none !important;
}

.oi-home .md-content {
  max-width: none;
  margin: 0;
}

.oi-home .md-content__inner {
  max-width: none;
  padding: 0;
  margin: 0;
}

.oi-home .md-typeset h2 {
  border-bottom: none;
  margin-top: 0;
}

.oi-home .md-main__inner {
  max-width: none;
}


/* --- Hero (Light Warm Gray) --- */

.oi-hero {
  background: linear-gradient(180deg, #f4f4f5 0%, #e4e4e7 100%);
  padding: 4.5rem 2rem 3.5rem;
  text-align: center;
  position: relative;
}

[data-md-color-scheme="slate"] .oi-hero {
  background: linear-gradient(180deg, #27272a 0%, #18181b 100%);
}

.oi-hero__badge {
  display: inline-block;
  background: rgba(0,0,0,0.06);
  color: var(--oi-text-secondary);
  padding: 0.3em 0.9em;
  border-radius: 999px;
  font-size: 0.78em;
  font-weight: 500;
  letter-spacing: 0.02em;
  margin-bottom: 1.4rem;
  border: 1px solid rgba(0,0,0,0.08);
}

[data-md-color-scheme="slate"] .oi-hero__badge {
  background: rgba(255,255,255,0.08);
  color: #a1a1aa;
  border-color: rgba(255,255,255,0.1);
}

.oi-hero__title {
  font-size: clamp(2.8rem, 6vw, 4rem);
  font-weight: 800;
  color: #18181b;
  line-height: 1.05;
  letter-spacing: -0.035em;
  margin: 0 auto 1.5rem;
  text-align: center;
}

[data-md-color-scheme="slate"] .oi-hero__title {
  color: #fafafa;
}

.oi-hero__subtitle {
  font-size: clamp(0.82rem, 1.2vw, 0.92rem);
  color: #71717a;
  line-height: 1.6;
  max-width: 480px;
  margin: 0 auto 2rem;
  font-weight: 400;
}

[data-md-color-scheme="slate"] .oi-hero__subtitle {
  color: #a1a1aa;
}

.oi-hero__actions {
  display: flex;
  gap: 0.7rem;
  justify-content: center;
  flex-wrap: wrap;
}


/* --- Buttons --- */

.oi-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.6em 1.5em;
  border-radius: var(--oi-radius-sm);
  font-weight: 600;
  font-size: 0.84em;
  text-decoration: none !important;
  border-bottom: none !important;
  transition: transform 0.1s ease, box-shadow 0.15s ease, background 0.15s ease;
  cursor: pointer;
}

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

.oi-btn--primary {
  background: #18181b;
  color: #ffffff !important;
  border: 1px solid #18181b;
}

.oi-btn--primary:hover {
  background: #27272a;
  box-shadow: 0 4px 12px rgba(0,0,0,0.12);
}

[data-md-color-scheme="slate"] .oi-btn--primary {
  background: #fafafa;
  color: #18181b !important;
  border-color: #fafafa;
}

[data-md-color-scheme="slate"] .oi-btn--primary:hover {
  background: #e4e4e7;
  box-shadow: 0 4px 12px rgba(255,255,255,0.08);
}

.oi-btn--secondary {
  background: transparent;
  color: #18181b !important;
  border: 1px solid #d4d4d8;
}

.oi-btn--secondary:hover {
  background: rgba(0,0,0,0.04);
  border-color: #a1a1aa;
}

[data-md-color-scheme="slate"] .oi-btn--secondary {
  color: #fafafa !important;
  border-color: #3f3f46;
}

[data-md-color-scheme="slate"] .oi-btn--secondary:hover {
  background: rgba(255,255,255,0.06);
  border-color: #52525b;
}


/* --- Stats --- */

.oi-stats {
  display: flex;
  justify-content: center;
  gap: 3rem;
  flex-wrap: wrap;
  padding: 1.4rem 0;
  margin: 0;
  background: var(--oi-surface);
  border-bottom: 1px solid var(--oi-border);
}

.oi-stat {
  text-align: center;
}

.oi-stat__number {
  font-size: 1.5em;
  font-weight: 800;
  color: var(--oi-text-primary);
  letter-spacing: -0.03em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.oi-stat__label {
  font-size: 0.68em;
  color: var(--oi-text-tertiary);
  font-weight: 600;
  margin-top: 0.25em;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}


/* --- Section --- */

.oi-section {
  max-width: 58rem;
  margin: 0 auto;
  padding: 0 2rem;
}

.oi-section__header {
  text-align: center;
  margin-bottom: 1.8rem;
}

.oi-section__title {
  font-size: 1.4em;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--oi-text-primary);
  margin: 0 0 0.25em;
}

.oi-section__subtitle {
  font-size: 0.92em;
  color: var(--oi-text-secondary);
  margin: 0;
}


/* --- Features --- */

.oi-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 0 0 3rem;
}

.oi-feature {
  background: var(--oi-surface);
  border: 1px solid var(--oi-border);
  border-radius: var(--oi-radius-md);
  padding: 1.4rem;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.oi-feature:hover {
  border-color: #d4d4d8;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

[data-md-color-scheme="slate"] .oi-feature:hover {
  border-color: #3f3f46;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.oi-feature__icon {
  width: 34px;
  height: 34px;
  border-radius: var(--oi-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.8rem;
  background: var(--oi-surface-sunken);
  color: var(--oi-text-secondary);
  border: 1px solid var(--oi-border);
}

.oi-feature__icon svg {
  width: 16px;
  height: 16px;
}

.oi-feature__title {
  font-weight: 600;
  font-size: 0.95em;
  margin-bottom: 0.35em;
  color: var(--oi-text-primary);
}

.oi-feature__desc {
  font-size: 0.85em;
  color: var(--oi-text-secondary);
  line-height: 1.6;
  margin: 0;
}

.oi-feature__link {
  display: inline-flex;
  align-items: center;
  gap: 0.25em;
  margin-top: 0.7em;
  font-size: 0.82em;
  font-weight: 500;
  color: var(--oi-text-primary) !important;
  text-decoration: none !important;
}

.oi-feature__link::after {
  content: "\2192";
  transition: transform 0.1s ease;
}

.oi-feature__link:hover::after {
  transform: translateX(3px);
}


/* --- Quick Start --- */

.oi-quickstart {
  background: var(--oi-surface-raised);
  border: 1px solid var(--oi-border);
  border-radius: var(--oi-radius-lg);
  padding: 1.8rem;
  margin: 0 0 3rem;
}

.oi-quickstart__title {
  font-size: 1.2em;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.25em;
  text-align: center;
  color: var(--oi-text-primary);
}

.oi-quickstart__subtitle {
  font-size: 0.88em;
  color: var(--oi-text-secondary);
  text-align: center;
  margin-bottom: 1.2rem;
}


/* --- Architecture --- */

.oi-architecture {
  margin: 3rem 0;
}

.oi-architecture__title {
  font-size: 1.2em;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.25em;
  text-align: center;
  color: var(--oi-text-primary);
}

.oi-architecture__subtitle {
  font-size: 0.88em;
  color: var(--oi-text-secondary);
  margin-bottom: 1.4rem;
  text-align: center;
}

.oi-arch-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.oi-arch-card {
  background: var(--oi-surface);
  border: 1px solid var(--oi-border);
  border-radius: var(--oi-radius-md);
  padding: 1.1rem 1.3rem;
}

.oi-arch-card__label {
  font-size: 0.68em;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--oi-text-tertiary);
  margin-bottom: 0.55rem;
}

.oi-arch-card__items {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.oi-arch-tag {
  display: inline-block;
  font-size: 0.76em;
  font-weight: 500;
  padding: 0.22em 0.65em;
  border-radius: 4px;
  background: var(--oi-surface-sunken);
  color: var(--oi-text-primary);
  border: 1px solid var(--oi-border);
}


/* --- Lifecycle Flow --- */

.oi-lifecycle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
  padding: 0.8rem 0;
  margin: 0.5rem 0 1rem;
}

.oi-lifecycle__step {
  display: flex;
  align-items: center;
  gap: 0;
}

.oi-lifecycle__node {
  font-size: 0.74em;
  font-weight: 600;
  padding: 0.35em 0.8em;
  border-radius: 4px;
  white-space: nowrap;
}

.oi-lifecycle__node--primary {
  background: #18181b;
  color: #ffffff;
}

[data-md-color-scheme="slate"] .oi-lifecycle__node--primary {
  background: #fafafa;
  color: #18181b;
}

.oi-lifecycle__node--accent {
  background: #52525b;
  color: #ffffff;
}

[data-md-color-scheme="slate"] .oi-lifecycle__node--accent {
  background: #71717a;
  color: #18181b;
}

.oi-lifecycle__arrow {
  color: var(--oi-text-tertiary);
  font-size: 0.74em;
  padding: 0 0.4em;
}


/* --- RFC Pills --- */

.oi-pill {
  display: inline-block;
  font-size: 0.74em;
  font-weight: 600;
  padding: 0.18em 0.55em;
  border-radius: 4px;
  letter-spacing: 0.02em;
}

.oi-pill--accepted {
  background: var(--oi-surface-sunken);
  color: var(--oi-text-primary);
  border: 1px solid var(--oi-border);
}

.oi-pill--proposed {
  background: transparent;
  color: var(--oi-text-secondary);
  border: 1px solid var(--oi-border);
}


/* --- Scrollbar --- */

::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-thumb {
  background: var(--oi-border);
  border-radius: 3px;
}

::-webkit-scrollbar-track {
  background: transparent;
}


/* --- Selection --- */

::selection {
  background: rgba(24,24,27,0.12);
  color: inherit;
}

[data-md-color-scheme="slate"] ::selection {
  background: rgba(250,250,250,0.18);
}


/* --- Responsive --- */

@media (max-width: 768px) {
  .oi-hero {
    padding: 3rem 1.2rem 2.5rem;
  }

  .oi-hero__title {
    font-size: 2.2rem;
  }

  .oi-features {
    grid-template-columns: 1fr;
  }

  .oi-arch-grid {
    grid-template-columns: 1fr;
  }

  .oi-stats {
    gap: 1.5rem;
  }

  .oi-quickstart {
    padding: 1.2rem;
  }

  .oi-lifecycle {
    flex-direction: column;
    gap: 0.3rem;
  }

  .oi-lifecycle__arrow {
    transform: rotate(90deg);
  }
}

@media (max-width: 480px) {
  .oi-features {
    gap: 0.75rem;
  }

  .oi-feature {
    padding: 1.1rem;
  }
}