/* ---------------------------------------------------------------------------
   AI Agent Roadmap - clean learning UI on top of Material for MkDocs.
   Keep the system calm, readable, and contributor-friendly.
--------------------------------------------------------------------------- */

.md-typeset h1 {
  font-weight: 800;
  letter-spacing: 0;
}

.md-typeset h2 {
  margin-top: 2.2rem;
  font-weight: 750;
  letter-spacing: 0;
}

.md-typeset a {
  text-underline-offset: 0.16em;
}

.md-main__inner {
  margin-top: 1.1rem;
}

@media screen and (min-width: 76.25em) {
  .md-grid {
    max-width: 72rem;
  }
}

/* ----------------------------- Hero banner ------------------------------ */

.hero {
  position: relative;
  overflow: hidden;
  margin: 0 0 2.25rem;
  padding: 3.2rem 1.5rem;
  border-radius: 12px;
  background: var(--md-primary-fg-color);
  color: #fff;
  text-align: center;
  box-shadow: 0 14px 36px rgba(17, 24, 39, 0.16);
}

.hero::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 5px;
  background: #22c55e;
  content: "";
}

[data-md-color-scheme="slate"] .hero {
  background: #101827;
  box-shadow: none;
}

.hero__eyebrow {
  display: inline-block;
  margin-bottom: 0.8rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  opacity: 0.85;
}

.md-typeset .hero h1 {
  margin: 0 auto 0.8rem;
  max-width: 18ch;
  color: #fff;
  font-size: 2.75rem;
  line-height: 1.1;
}

.md-typeset .hero p {
  margin: 0 auto 1.6rem;
  max-width: 52ch;
  color: rgba(255, 255, 255, 0.92);
  font-size: 1.05rem;
}

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

.md-typeset .hero .md-button {
  margin: 0;
  border-color: rgba(255, 255, 255, 0.7);
  color: #fff;
}

.md-typeset .hero .md-button--primary,
.md-typeset .hero .md-button:hover {
  border-color: #fff;
  background: #fff;
  color: var(--md-primary-fg-color);
}

/* ----------------------------- Phase flow ------------------------------- */

.phase-flow {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.7rem;
  margin: 1.4rem 0 2rem;
}

.flow-step {
  position: relative;
  min-height: 5.4rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--md-default-fg-color--lightest);
  border-radius: 8px;
  background: var(--md-default-bg-color);
}

.flow-step:not(:last-child)::after {
  position: absolute;
  top: 50%;
  right: -0.58rem;
  z-index: 2;
  width: 0.7rem;
  height: 0.7rem;
  border-top: 2px solid var(--md-primary-fg-color);
  border-right: 2px solid var(--md-primary-fg-color);
  transform: translateY(-50%) rotate(45deg);
  content: "";
}

.flow-step__number {
  display: block;
  margin-bottom: 0.25rem;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--md-primary-fg-color);
}

.flow-step__title {
  display: block;
  font-size: 1rem;
  font-weight: 750;
}

.flow-step__text {
  display: block;
  margin-top: 0.25rem;
  font-size: 0.76rem;
  color: var(--md-default-fg-color--light);
}

/* --------------------------- Phase overview ----------------------------- */

.phases {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  margin: 1.5rem 0 2rem;
}

.phase {
  padding: 1rem;
  border: 1px solid var(--md-default-fg-color--lightest);
  border-top: 4px solid var(--md-primary-fg-color);
  border-radius: 8px;
  background: var(--md-default-bg-color);
  transition: border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

.phase:hover {
  border-color: color-mix(in srgb, var(--md-primary-fg-color) 34%, var(--md-default-fg-color--lightest));
  box-shadow: 0 10px 22px rgba(17, 24, 39, 0.08);
  transform: translateY(-2px);
}

.phase__label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--md-primary-fg-color);
}

.md-typeset .phase h3 {
  margin: 0.2rem 0 0.4rem;
  font-size: 1.05rem;
}

.md-typeset .phase p {
  margin: 0;
  font-size: 0.8rem;
  color: var(--md-default-fg-color--light);
}

@media screen and (max-width: 800px) {
  .phase-flow,
  .phases {
    grid-template-columns: repeat(2, 1fr);
  }

  .flow-step:not(:last-child)::after {
    display: none;
  }
}

@media screen and (max-width: 480px) {
  .phase-flow,
  .phases {
    grid-template-columns: 1fr;
  }

  .md-typeset .hero h1 {
    font-size: 1.95rem;
  }
}

/* ----------------------------- Stage lists ------------------------------ */

.stage-list {
  margin: 1rem 0 2rem;
}

.stage-list ul {
  display: grid;
  gap: 0.65rem;
  margin-left: 0;
  padding-left: 0;
}

.stage-list li {
  position: relative;
  margin: 0;
  padding: 0.78rem 0.9rem 0.78rem 1rem;
  border: 1px solid var(--md-default-fg-color--lightest);
  border-left: 4px solid var(--md-primary-fg-color);
  border-radius: 8px;
  background: var(--md-default-bg-color);
  list-style: none;
  transition: background 160ms ease, border-color 160ms ease, transform 160ms ease;
}

.stage-list li:hover {
  border-color: color-mix(in srgb, var(--md-primary-fg-color) 28%, var(--md-default-fg-color--lightest));
  background: color-mix(in srgb, var(--md-primary-fg-color) 4%, var(--md-default-bg-color));
  transform: translateX(2px);
}

.stage-list a {
  font-weight: 750;
  text-decoration: none;
}

.stage-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 2rem;
}

/* -------------------------- Topic learning pages ------------------------ */

.md-typeset .topic-page {
  --topic-border: color-mix(in srgb, var(--md-default-fg-color) 12%, transparent);
  --topic-soft: color-mix(in srgb, var(--md-primary-fg-color) 4%, var(--md-default-bg-color));
  max-width: 100%;
}

.md-typeset .topic-page > h2 {
  margin-top: 3.2rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--topic-border);
  font-size: 1.45rem;
}

.md-typeset .topic-page > h2[id^="part-"] {
  position: relative;
  margin-top: 3.8rem;
  padding: 1.25rem 1.35rem;
  border: 1px solid var(--topic-border);
  border-left: 5px solid var(--md-primary-fg-color);
  border-radius: 8px;
  background: linear-gradient(90deg, var(--topic-soft), var(--md-default-bg-color));
  box-shadow: 0 8px 20px rgba(17, 24, 39, 0.04);
}

.md-typeset .topic-page > h2[id^="part-"]::before {
  display: block;
  margin-bottom: 0.3rem;
  color: var(--md-primary-fg-color);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  content: "Current learning section";
}

.md-typeset .topic-page > h3 {
  margin-top: 2.2rem;
  font-size: 1.08rem;
}

.md-typeset .topic-page > h4 {
  margin-top: 1.8rem;
  color: var(--md-default-fg-color);
  font-size: 0.98rem;
  font-weight: 800;
}

.md-typeset .topic-page > p,
.md-typeset .topic-page > ul,
.md-typeset .topic-page > ol {
  max-width: 82ch;
  line-height: 1.75;
}

.md-typeset .topic-page table {
  display: table;
  width: 100%;
  margin: 1.2rem 0 2.2rem;
  overflow: hidden;
  border: 1px solid var(--topic-border);
  border-radius: 8px;
  box-shadow: 0 8px 20px rgba(17, 24, 39, 0.04);
}

.md-typeset .topic-page table th {
  background: var(--topic-soft);
  color: var(--md-default-fg-color);
  font-weight: 800;
}

.md-typeset .topic-page table td,
.md-typeset .topic-page table th {
  padding: 0.78rem 0.9rem;
  vertical-align: top;
}

.md-typeset .topic-page pre {
  border-radius: 8px;
}

.topic-hero {
  position: relative;
  overflow: hidden;
  margin: 0.75rem 0 2.8rem;
  padding: 2.75rem;
  border: 1px solid var(--md-default-fg-color--lightest);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(63, 81, 181, 0.13), rgba(0, 188, 212, 0.08) 52%, rgba(34, 197, 94, 0.07)),
    var(--md-default-bg-color);
  box-shadow: 0 16px 34px rgba(17, 24, 39, 0.08);
}

.topic-hero::after {
  position: absolute;
  inset: auto 0 0;
  height: 5px;
  background: linear-gradient(90deg, #3f51b5, #00bcd4, #22c55e, #f59e0b);
  content: "";
}

.topic-hero__eyebrow {
  display: inline-block;
  margin-bottom: 0.65rem;
  color: var(--md-primary-fg-color);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.md-typeset .topic-hero__lead {
  max-width: 66rem;
  margin: 0;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--md-default-fg-color);
  font-size: 1.12rem;
  line-height: 1.75;
}

.topic-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.45rem;
}

.topic-hero__facts span {
  padding: 0.38rem 0.72rem;
  border: 1px solid color-mix(in srgb, var(--md-primary-fg-color) 24%, var(--md-default-fg-color--lightest));
  border-radius: 999px;
  background: color-mix(in srgb, var(--md-primary-fg-color) 7%, var(--md-default-bg-color));
  color: var(--md-default-fg-color);
  font-size: 0.76rem;
  font-weight: 700;
}

.learning-grid,
.practice-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin: 1.35rem 0 2.4rem;
}

.learning-card,
.practice-grid article {
  min-height: 8rem;
  padding: 1.25rem;
  border: 1px solid var(--md-default-fg-color--lightest);
  border-top: 4px solid var(--md-primary-fg-color);
  border-radius: 8px;
  background: var(--md-default-bg-color);
  transition: border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

.md-typeset a.learning-card {
  color: inherit;
  text-decoration: none;
}

.learning-grid--path .learning-card {
  min-height: 9rem;
}

.learning-grid--path .learning-card strong {
  color: var(--md-primary-fg-color);
}

.learning-card:nth-child(2),
.practice-grid article:nth-child(2) {
  border-top-color: #00acc1;
}

.learning-card:nth-child(3),
.practice-grid article:nth-child(3) {
  border-top-color: #22c55e;
}

.learning-card:nth-child(4),
.practice-grid article:nth-child(4) {
  border-top-color: #f59e0b;
}

.learning-card:hover,
.practice-grid article:hover {
  border-color: color-mix(in srgb, var(--md-primary-fg-color) 26%, var(--md-default-fg-color--lightest));
  box-shadow: 0 10px 22px rgba(17, 24, 39, 0.08);
  transform: translateY(-2px);
}

.learning-card strong,
.practice-grid strong {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

.learning-card span,
.practice-grid span {
  display: block;
  color: var(--md-default-fg-color--light);
  font-size: 0.84rem;
  line-height: 1.6;
}

.visual-checklist {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin: 1.35rem 0 2.4rem;
}

.visual-checklist > div {
  padding: 1.25rem;
  border: 1px solid var(--md-default-fg-color--lightest);
  border-left: 4px solid #ef4444;
  border-radius: 8px;
  background: var(--md-default-bg-color);
}

.visual-checklist > div:nth-child(2) {
  border-left-color: #22c55e;
}

.visual-checklist strong {
  display: block;
  margin-bottom: 0.45rem;
}

.md-typeset .visual-checklist ul {
  margin: 0;
  padding-left: 1rem;
}

.prompt-compare {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin: 1.35rem 0 2.4rem;
}

.prompt-compare section {
  min-width: 0;
  padding: 1.25rem;
  border: 1px solid var(--md-default-fg-color--lightest);
  border-radius: 8px;
  background: var(--md-default-bg-color);
}

.prompt-compare__label {
  display: inline-block;
  margin-bottom: 0.65rem;
  padding: 0.2rem 0.52rem;
  border-radius: 999px;
  color: #fff;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.prompt-compare__label--bad {
  background: #dc2626;
}

.prompt-compare__label--good {
  background: #16a34a;
}

.md-typeset .prompt-compare pre {
  margin: 0 0 0.75rem;
}

.md-typeset .prompt-compare p {
  margin: 0;
  color: var(--md-default-fg-color--light);
  font-size: 0.84rem;
  line-height: 1.55;
}

.md-typeset .topic-page .mermaid {
  margin: 1.4rem 0 2.4rem;
  padding: 1.35rem;
  border: 1px solid var(--md-default-fg-color--lightest);
  border-radius: 8px;
  background: var(--topic-soft);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, #fff 40%, transparent);
}

@media screen and (max-width: 620px) {
  .topic-hero {
    padding: 1.35rem;
  }

  .learning-grid,
  .practice-grid,
  .visual-checklist,
  .prompt-compare {
    grid-template-columns: 1fr;
  }
}

/* ---------------------------- Stage pages ------------------------------- */

.md-typeset > h1 + p {
  padding: 0.9rem 1rem;
  border: 1px solid var(--md-default-fg-color--lightest);
  border-left: 4px solid var(--md-primary-fg-color);
  border-radius: 8px;
  background: color-mix(in srgb, var(--md-primary-fg-color) 5%, var(--md-default-bg-color));
}

.md-typeset h2 + ul li {
  margin-bottom: 0.2rem;
}

.md-typeset h2#learn + ul,
.md-typeset h2#exit-criteria + ul {
  padding: 0.35rem 0 0.35rem 1.05rem;
}

.md-typeset h2#learn + ul a {
  font-weight: 650;
}

/* ----------------------------- Motion ----------------------------------- */

@media (prefers-reduced-motion: no-preference) {
  .md-content__inner {
    animation: page-soft-enter 180ms ease-out both;
  }

  .hero,
  .phase-flow,
  .phases,
  .stage-list li,
  .md-typeset > h1 + p {
    animation: roadmap-fade-up 420ms ease both;
  }

  .phase:nth-child(2),
  .flow-step:nth-child(2) {
    animation-delay: 60ms;
  }

  .phase:nth-child(3),
  .flow-step:nth-child(3) {
    animation-delay: 120ms;
  }

  .phase:nth-child(4),
  .flow-step:nth-child(4) {
    animation-delay: 180ms;
  }

  @keyframes roadmap-fade-up {
    from {
      opacity: 0;
      transform: translateY(8px);
    }

    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  @keyframes page-soft-enter {
    from {
      opacity: 0.72;
      transform: translateY(4px);
    }

    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}