/* ==========================================================================
   TI Mindmap HUB — Custom Theme
   Matches the app's indigo-to-purple gradient design system.
   ========================================================================== */

/* ---------- Design Tokens ---------- */
:root {
  --hub-indigo: #667eea;
  --hub-purple: #764ba2;
  --hub-slate:  #4a5568;
  --hub-amber:  #f59e0b;
  --hub-radius: 12px;
  --hub-gradient: linear-gradient(135deg, #4a5568 0%, #667eea 50%, #764ba2 100%);
}

/* ==========================================================================
   Dark (Slate) Scheme — Default
   ========================================================================== */
[data-md-color-scheme="slate"] {
  --md-hue: 230;
  --md-primary-fg-color:        #667eea;
  --md-primary-fg-color--light: #8299ee;
  --md-primary-fg-color--dark:  #4f6ce6;
  --md-primary-bg-color:        #ffffff;
  --md-accent-fg-color:         #9f7aea;
  --md-default-bg-color:        #1a1b2e;
  --md-default-bg-color--light: #22243a;
  --md-default-bg-color--lighter: #2a2d47;
  --md-default-bg-color--lightest: #333654;
  --md-code-bg-color:           #22243a;
  --md-typeset-a-color:         #667eea;
  --md-footer-bg-color:         #13142380;
  --md-footer-bg-color--dark:   #0f1017;
}

/* ==========================================================================
   Light Scheme — Harmonized
   ========================================================================== */
[data-md-color-scheme="default"] {
  --md-primary-fg-color:        #667eea;
  --md-primary-fg-color--light: #8299ee;
  --md-primary-fg-color--dark:  #4f6ce6;
  --md-accent-fg-color:         #764ba2;
  --md-typeset-a-color:         #5a6fd6;
}

/* ==========================================================================
   Header — Gradient Banner
   ========================================================================== */
.md-header {
  background: var(--hub-gradient);
  box-shadow: 0 2px 16px rgba(102, 126, 234, 0.25);
}

.md-header[data-md-state="shadow"] {
  box-shadow: 0 4px 24px rgba(102, 126, 234, 0.35);
}

/* Ensure tabs bar matches */
.md-tabs {
  background: rgba(0, 0, 0, 0.15);
}

/* ==========================================================================
   Hero Section (homepage)
   ========================================================================== */
.hero {
  background: var(--hub-gradient);
  border-radius: var(--hub-radius);
  padding: 3rem 2.5rem;
  margin-bottom: 2rem;
  color: #ffffff;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -8%;
  width: 280px;
  height: 280px;
  background: rgba(255, 255, 255, 0.07);
  border-radius: 50%;
  filter: blur(60px);
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  bottom: -30%;
  left: -5%;
  width: 200px;
  height: 200px;
  background: rgba(118, 75, 162, 0.2);
  border-radius: 50%;
  filter: blur(50px);
  pointer-events: none;
}

.hero > * {
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: 2.4rem;
  font-weight: 800;
  margin: 0 0 0.5rem 0;
  color: #ffffff;
  line-height: 1.15;
}

.hero .hero__subtitle {
  font-size: 1.15rem;
  opacity: 0.92;
  margin-bottom: 1.25rem;
  max-width: 720px;
  line-height: 1.6;
}

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

.hero__chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.85rem;
  background: rgba(255, 255, 255, 0.18);
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 600;
  color: #ffffff;
  backdrop-filter: blur(4px);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

@media (max-width: 768px) {
  .hero {
    padding: 2rem 1.5rem;
  }
  .hero h1 {
    font-size: 1.7rem;
  }
}

/* ==========================================================================
   Feature Cards Grid
   ========================================================================== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin: 1.5rem 0;
}

@media (max-width: 768px) {
  .feature-grid {
    grid-template-columns: 1fr;
  }
}

.feature-card {
  padding: 1.5rem;
  border-radius: var(--hub-radius);
  border: 1px solid rgba(102, 126, 234, 0.12);
  transition: all 0.3s ease-in-out;
  position: relative;
  overflow: hidden;
}

[data-md-color-scheme="slate"] .feature-card {
  background: rgba(34, 36, 58, 0.7);
  backdrop-filter: blur(10px);
}

[data-md-color-scheme="default"] .feature-card {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(10px);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(102, 126, 234, 0.18);
  border-color: rgba(102, 126, 234, 0.3);
}

.feature-card .feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.2), rgba(118, 75, 162, 0.2));
  font-size: 1.4rem;
  margin-bottom: 0.85rem;
}

.feature-card h3 {
  margin: 0 0 0.4rem 0;
  font-size: 1.05rem;
  font-weight: 700;
}

.feature-card p {
  margin: 0;
  font-size: 0.88rem;
  opacity: 0.82;
  line-height: 1.55;
}

/* Wide card spanning 2 columns */
.feature-card--wide {
  grid-column: span 2;
}

@media (max-width: 768px) {
  .feature-card--wide {
    grid-column: span 1;
  }
}

/* ==========================================================================
   Use-Case / Audience Cards
   ========================================================================== */
.audience-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin: 1.5rem 0;
}

@media (max-width: 900px) {
  .audience-grid {
    grid-template-columns: 1fr;
  }
}

.audience-card {
  padding: 1.5rem;
  border-radius: var(--hub-radius);
  border: 1px solid rgba(102, 126, 234, 0.1);
  transition: all 0.25s ease-in-out;
}

[data-md-color-scheme="slate"] .audience-card {
  background: rgba(102, 126, 234, 0.06);
}

[data-md-color-scheme="default"] .audience-card {
  background: rgba(102, 126, 234, 0.04);
}

.audience-card:hover {
  transform: translateX(4px);
  border-color: rgba(102, 126, 234, 0.25);
}

[data-md-color-scheme="slate"] .audience-card:hover {
  background: rgba(102, 126, 234, 0.12);
}

[data-md-color-scheme="default"] .audience-card:hover {
  background: rgba(102, 126, 234, 0.08);
}

.audience-card h3 {
  margin: 0 0 0.35rem 0;
  font-size: 1rem;
  font-weight: 700;
}

.audience-card p {
  margin: 0;
  font-size: 0.88rem;
  opacity: 0.82;
  line-height: 1.5;
}

/* ==========================================================================
   Quick-Link Cards
   ========================================================================== */
.link-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.85rem;
  margin: 1.5rem 0;
}

@media (max-width: 768px) {
  .link-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .link-grid {
    grid-template-columns: 1fr;
  }
}

.link-card {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.85rem 1rem;
  border-radius: 8px;
  text-decoration: none !important;
  font-weight: 600;
  font-size: 0.88rem;
  border: 1px solid rgba(102, 126, 234, 0.15);
  transition: all 0.2s ease;
}

[data-md-color-scheme="slate"] .link-card {
  background: rgba(102, 126, 234, 0.07);
  color: var(--md-default-fg-color);
}

[data-md-color-scheme="default"] .link-card {
  background: rgba(102, 126, 234, 0.05);
  color: var(--md-default-fg-color);
}

.link-card:hover {
  border-color: rgba(102, 126, 234, 0.4);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.12);
}

/* ==========================================================================
   Admonitions — Rounded card style
   ========================================================================== */
.md-typeset .admonition,
.md-typeset details {
  border-radius: var(--hub-radius);
  border: none;
  border-left: 4px solid;
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.08);
}

[data-md-color-scheme="slate"] .md-typeset .admonition,
[data-md-color-scheme="slate"] .md-typeset details {
  box-shadow: 0 1px 8px rgba(0, 0, 0, 0.2);
}

.md-typeset .admonition-title,
.md-typeset summary {
  border-radius: var(--hub-radius) var(--hub-radius) 0 0;
}

/* ==========================================================================
   Code Blocks — Rounded to match cards
   ========================================================================== */
.md-typeset pre > code {
  border-radius: var(--hub-radius);
}

.md-typeset code {
  border-radius: 4px;
}

[data-md-color-scheme="slate"] .md-typeset pre > code {
  border: 1px solid rgba(102, 126, 234, 0.1);
}

/* ==========================================================================
   Navigation Sidebar
   ========================================================================== */
.md-nav__link--active {
  font-weight: 600;
}

[data-md-color-scheme="slate"] .md-nav__link:hover {
  color: var(--hub-indigo);
}

/* ==========================================================================
   Footer
   ========================================================================== */
[data-md-color-scheme="slate"] .md-footer {
  border-top: 1px solid rgba(102, 126, 234, 0.1);
}

/* ==========================================================================
   Tables — subtle styling
   ========================================================================== */
.md-typeset table:not([class]) {
  border-radius: 8px;
  overflow: hidden;
}

[data-md-color-scheme="slate"] .md-typeset table:not([class]) th {
  background: rgba(102, 126, 234, 0.12);
}

/* ==========================================================================
   Responsive YouTube Embed
   ========================================================================== */
.video-wrapper {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  max-width: 100%;
  margin: 1.5em 0;
  border-radius: var(--hub-radius);
}

.video-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
  border-radius: var(--hub-radius);
}

/* ==========================================================================
   Smooth transitions for scheme toggle
   ========================================================================== */
body,
.md-header,
.md-tabs,
.md-main,
.md-footer {
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* ==========================================================================
   Section separator — subtle gradient line
   ========================================================================== */
.md-typeset hr {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(102, 126, 234, 0.3), transparent);
  margin: 2rem 0;
}