/* ==========================================================================
   SpinalfMRIprep Documentation Styles
   Best practices: responsive, accessible, performant
   ========================================================================== */

/* ==========================================================================
   1. CSS Custom Properties (Design Tokens)
   ========================================================================== */

:root {
  /* Primary Colors */
  --md-primary-fg-color: #0f172a;
  --md-accent-fg-color: #0e7490;

  /* Hero Section */
  --tx-hero-bg-light: #ffffff;
  --tx-hero-bg-dark: #020617;
  --tx-hero-text-light: #0f172a;

  /* Card Styling */
  --md-shadow-z1: none;
  --md-shadow-z2: none;

  /* SpinalfMRIprep Brand Colors */
  --tx-brand-spinal: rgb(120, 150, 200);
  --tx-brand-fmri: rgb(231, 130, 49);
  --tx-brand-prep: rgb(70, 130, 150);

  /* Focus Ring */
  --tx-focus-ring: 0 0 0 3px rgba(14, 116, 144, 0.5);

  /* Spacing */
  --tx-space-xs: 0.25rem;
  --tx-space-sm: 0.5rem;
  --tx-space-md: 1rem;
  --tx-space-lg: 2rem;
  --tx-space-xl: 3rem;
}

/* ==========================================================================
   2. Base Styles & Resets
   ========================================================================== */

/* Smooth scrolling (respects reduced motion) */
@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

/* Prevent horizontal overflow */
html, body {
  overflow-x: hidden;
}

/* ==========================================================================
   3. Skip Link (Accessibility)
   ========================================================================== */

.tx-skip-link {
  position: absolute;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--md-primary-fg-color);
  color: #fff !important;
  padding: 0.75rem 1.5rem;
  border-radius: 0 0 6px 6px;
  z-index: 9999;
  text-decoration: none;
  font-weight: 600;
  transition: top 0.2s ease;
}

.tx-skip-link:focus {
  top: 0;
  outline: none;
}

/* ==========================================================================
   4. Focus Styles (Accessibility)
   ========================================================================== */

/* Visible focus for keyboard navigation */
*:focus-visible {
  outline: none;
  box-shadow: var(--tx-focus-ring);
}

/* Links focus */
a:focus-visible {
  outline: 2px solid var(--md-accent-fg-color);
  outline-offset: 2px;
  box-shadow: none;
}

/* Buttons focus */
.tx-btn:focus-visible,
.md-button:focus-visible {
  outline: 2px solid var(--md-accent-fg-color);
  outline-offset: 2px;
  box-shadow: var(--tx-focus-ring);
}

/* ==========================================================================
   5. SpinalfMRIprep 3-Color Branding
   ========================================================================== */

.tx-brand-spinal {
  color: var(--tx-brand-spinal);
}

.tx-brand-fmri {
  color: var(--tx-brand-fmri);
}

.tx-brand-prep {
  color: var(--tx-brand-prep);
}

/* Header/Nav branding */
.md-header__title .tx-brand-spinal,
.md-header__title .tx-brand-fmri,
.md-header__title .tx-brand-prep {
  font-weight: 700;
}

/* Dark mode brand colors */
[data-md-color-scheme="slate"] .tx-brand-spinal {
  color: var(--tx-brand-spinal);
}

[data-md-color-scheme="slate"] .tx-brand-fmri {
  color: var(--tx-brand-fmri);
}

[data-md-color-scheme="slate"] .tx-brand-prep {
  color: var(--tx-brand-prep);
}

/* ==========================================================================
   6. Header Customizations
   ========================================================================== */

/* Logo sizing */
.md-header__button.md-logo {
  margin-right: 0.2rem;
}

.md-header__button.md-logo img,
.md-header__button.md-logo svg {
  height: 2.4rem;
  width: auto;
}

/* Hide default Material theme title (using custom branded one) */
.md-header__title:not(.tx-header__title--custom) {
  display: none;
}

/* Custom branded title */
.tx-header__title--custom {
  display: flex !important;
  align-items: center;
  margin-left: 0.4rem;
}

/* Hide header title on small screens (keep logo only) */
@media (max-width: 480px) {
  .tx-header__title--custom {
    display: none !important;
  }
}

/* ==========================================================================
   7. Hero Section
   ========================================================================== */

.tx-hero {
  min-height: 40vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: var(--tx-hero-bg-light);
  padding: clamp(2rem, 5vw, 4rem) var(--tx-space-md);
  position: relative;
  overflow: hidden;
}

[data-md-color-scheme="slate"] .tx-hero {
  background: var(--tx-hero-bg-dark);
}

/* Hero container: side-by-side on desktop, stacked on mobile */
.tx-hero__container {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  gap: clamp(1.5rem, 4vw, 3rem);
  max-width: 1200px;
  width: 100%;
}

.tx-hero__logo {
  flex-shrink: 0;
}

/* Fluid logo sizing (20% larger) */
.tx-hero__logo img,
.tx-hero__logo svg {
  height: clamp(144px, 30vw, 384px);
  width: auto;
  display: block;
}

.tx-hero__content {
  text-align: left;
  max-width: 100%;
  overflow: hidden;
}

/* Fluid hero title */
.tx-hero h1 {
  font-size: clamp(1.5rem, 5vw, 3.5rem);
  word-break: break-word;
  overflow-wrap: break-word;
  max-width: 100%;
  font-weight: 800;
  margin-bottom: var(--tx-space-md);
  letter-spacing: -0.02em;
  z-index: 2;
}

/* Hero subtitle */
.tx-hero p {
  font-size: clamp(1rem, 2vw, 1.25rem);
  max-width: 600px;
  margin-bottom: var(--tx-space-lg);
  color: #475569;
  line-height: 1.6;
  z-index: 2;
}

[data-md-color-scheme="slate"] .tx-hero p {
  color: #94a3b8;
}

/* ==========================================================================
   8. CTA Buttons
   ========================================================================== */

.tx-cta-buttons {
  display: flex;
  gap: var(--tx-space-md);
  z-index: 2;
  flex-wrap: wrap;
}

.tx-btn {
  padding: 0.875rem 2rem;
  border-radius: 6px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  min-height: 44px; /* Touch target */
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

/* Reduced motion: disable transforms */
@media (prefers-reduced-motion: no-preference) {
  .tx-btn {
    transition: all 0.2s ease;
  }
  
  .tx-btn:hover {
    transform: translateY(-1px);
  }
}

.tx-btn-primary {
  background: #0f172a;
  color: #fff !important;
}

.tx-btn-primary:hover {
  background: #1e293b;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

[data-md-color-scheme="slate"] .tx-btn-primary {
  background: #e2e8f0;
  color: #0f172a !important;
}

[data-md-color-scheme="slate"] .tx-btn-primary:hover {
  background: #f8fafc;
}

.tx-btn-secondary {
  border: 1px solid #e2e8f0;
  color: #0f172a;
  background: white;
}

.tx-btn-secondary:hover {
  border-color: #cbd5e1;
  background: #f8fafc;
}

[data-md-color-scheme="slate"] .tx-btn-secondary {
  background: transparent;
  border-color: #334155;
  color: #e2e8f0;
}

[data-md-color-scheme="slate"] .tx-btn-secondary:hover {
  border-color: #475569;
  background: rgba(255, 255, 255, 0.05);
}

/* ==========================================================================
   9. Hero Badges
   ========================================================================== */

.tx-badges {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.tx-badge {
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 500;
  color: white;
  white-space: nowrap;
}

.tx-badge--primary {
  background: #0e7490;
}

.tx-badge--secondary {
  background: #475569;
}

/* ==========================================================================
   10. Feature Cards Grid
   ========================================================================== */

.md-typeset .grid.cards > ul {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--tx-space-md);
}

.md-typeset .grid.cards > ul > li {
  margin: 0;
  height: 100%;
}

/* Card styling */
.md-typeset .grid > ul > li,
.md-typeset .grid > .card {
  border: 1px solid #e2e8f0;
  box-shadow: none !important;
  border-radius: 6px;
}

/* Card hover with reduced motion support */
@media (prefers-reduced-motion: no-preference) {
  .md-typeset .grid > ul > li,
  .md-typeset .grid > .card {
    transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
  }
  
  .md-typeset .grid > ul > li:hover,
  .md-typeset .grid > .card:hover {
    border-color: #0e7490;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  }
}

@media (prefers-reduced-motion: reduce) {
  .md-typeset .grid > ul > li:hover,
  .md-typeset .grid > .card:hover {
    border-color: #0e7490;
  }
}

[data-md-color-scheme="slate"] .md-typeset .grid > ul > li,
[data-md-color-scheme="slate"] .md-typeset .grid > .card {
  border-color: #1e293b;
}

[data-md-color-scheme="slate"] .md-typeset .grid > ul > li:hover,
[data-md-color-scheme="slate"] .md-typeset .grid > .card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* ==========================================================================
   11. Navigation Active States (Orange + Left Border)
   ========================================================================== */

/* Active state color variable */
:root {
  --tx-nav-active: rgb(231, 130, 49); /* Brand fMRI orange */
  --tx-nav-active-border: 3px solid rgb(231, 130, 49);
}

/* --- Sidebar Navigation --- */
.md-nav__item--active > .md-nav__link,
.md-nav__link--active {
  color: var(--tx-nav-active) !important;
  font-weight: 600;
  border-left: var(--tx-nav-active-border);
  margin-left: -0.6rem;
  padding-left: calc(0.6rem - 3px);
}

/* Current page indicator */
.md-nav__link[data-md-state="current"] {
  color: var(--tx-nav-active) !important;
  font-weight: 600;
  border-left: var(--tx-nav-active-border);
  margin-left: -0.6rem;
  padding-left: calc(0.6rem - 3px);
}

/* Hover state */
.md-nav__link:hover {
  color: var(--tx-nav-active) !important;
}

/* --- Top Tabs Navigation --- */
.md-tabs__link--active,
.md-tabs__item--active .md-tabs__link {
  color: var(--tx-nav-active) !important;
  border-bottom: 3px solid var(--tx-nav-active);
  font-weight: 600;
}

.md-tabs__link:hover {
  color: var(--tx-nav-active) !important;
}

/* --- Table of Contents (TOC) --- */
.md-nav--secondary .md-nav__link--active,
.md-nav--secondary .md-nav__item--active > .md-nav__link {
  color: var(--tx-nav-active) !important;
  border-left: var(--tx-nav-active-border);
  margin-left: -0.6rem;
  padding-left: calc(0.6rem - 3px);
}

/* --- Mobile Drawer Navigation --- */
@media (max-width: 76.1875em) {
  .md-nav--primary .md-nav__item--active > .md-nav__link,
  .md-nav--primary .md-nav__link--active {
    color: var(--tx-nav-active) !important;
    background: rgba(231, 130, 49, 0.1);
    border-left: var(--tx-nav-active-border);
    margin-left: 0;
    padding-left: calc(0.6rem + 9px);
  }
}

/* ==========================================================================
   12. Dark Mode Overrides
   ========================================================================== */

[data-md-color-scheme="slate"] {
  --md-primary-fg-color: #0f172a;
  --md-bg-color: #020617;
  /* Orange stays the same in dark mode - good contrast */
  --tx-nav-active: rgb(231, 130, 49);
}

/* Dark mode nav text (non-active) */
[data-md-color-scheme="slate"] .md-nav__link {
  color: #94a3b8;
}

[data-md-color-scheme="slate"] .md-nav__link:hover {
  color: var(--tx-nav-active) !important;
}

/* Dark mode active states inherit the orange */
[data-md-color-scheme="slate"] .md-nav__item--active > .md-nav__link,
[data-md-color-scheme="slate"] .md-nav__link--active,
[data-md-color-scheme="slate"] .md-nav__link[data-md-state="current"] {
  color: var(--tx-nav-active) !important;
}

/* Dark mode tabs */
[data-md-color-scheme="slate"] .md-tabs__link--active,
[data-md-color-scheme="slate"] .md-tabs__item--active .md-tabs__link {
  color: var(--tx-nav-active) !important;
}

/* ==========================================================================
   12. Typography
   ========================================================================== */

.md-typeset h1,
.md-typeset h2 {
  font-weight: 700;
}

/* Ensure readable body text on mobile */
.md-typeset {
  font-size: clamp(0.875rem, 2vw, 1rem);
}

/* ==========================================================================
   13. Homepage Specific Styles
   ========================================================================== */

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

.tx-home-content {
  max-width: 800px;
  margin: clamp(2rem, 5vw, 4rem) auto;
  padding: 0 var(--tx-space-md);
}

/* Hide redundant elements on homepage */
.tx-home-content > h1,
.tx-home-content > .md-typeset > h1,
.tx-home-content .md-content__inner > h1:first-of-type,
.tx-home-content h1,
.tx-home-content .md-typeset h1 {
  display: none !important;
}

/* Hide sidebar on homepage */
.tx-home-content ~ .md-sidebar,
body:has(.tx-home-content) .md-sidebar--primary {
  display: none !important;
}

.tx-home-content .md-source-file,
.tx-home-content .git-revision-date-localized-plugin,
.tx-home-content small:has(span) {
  display: none !important;
}

/* Hide edit icon on homepage */
.tx-home-content .md-content__button {
  display: none !important;
}

/* ==========================================================================
   14. Responsive Breakpoints
   ========================================================================== */

/* Large tablets and small desktops (≤1200px) */
@media (max-width: 1200px) {
  .tx-hero__container {
    max-width: 960px;
  }
}

/* Tablets (≤960px) - Stack hero */
@media (max-width: 960px) {
  .tx-hero__container {
    flex-direction: column;
    text-align: center;
  }

  .tx-hero__content {
    text-align: center;
  }

  .tx-cta-buttons {
    justify-content: center;
  }

  .tx-badges {
    justify-content: center;
  }
}

/* Small tablets (≤768px) */
@media (max-width: 768px) {
  .tx-hero {
    min-height: auto;
  }

  .tx-cta-buttons {
    flex-direction: column;
    width: 100%;
    max-width: 300px;
  }

  .tx-btn {
    width: 100%;
  }

  .tx-badges {
    flex-direction: column;
    align-items: center;
  }
}

/* Mobile (≤600px) - Single column cards */
@media (max-width: 600px) {
  .md-typeset .grid.cards > ul {
    grid-template-columns: 1fr;
  }
}

/* Small mobile (≤480px) */
@media (max-width: 480px) {
  .tx-hero {
    padding: var(--tx-space-lg) var(--tx-space-md);
  }

  .tx-hero__logo img,
  .tx-hero__logo svg {
    height: 120px;
  }

  .tx-btn {
    padding: 0.75rem 1.25rem;
    font-size: 0.9rem;
  }

  .tx-home-content {
    padding: 0 var(--tx-space-sm);
  }
}

/* Very small mobile (≤320px) */
@media (max-width: 320px) {
  .tx-hero h1 {
    font-size: 1.5rem;
  }

  .tx-hero p {
    font-size: 0.875rem;
  }

  .tx-badge {
    font-size: 0.75rem;
    padding: 0.2rem 0.5rem;
  }
}

/* ==========================================================================
   15. Print Styles
   ========================================================================== */

@media print {
  .tx-hero {
    min-height: auto;
    padding: 1rem;
  }

  .tx-hero__logo img,
  .tx-hero__logo svg {
    height: 96px;
  }

  .tx-cta-buttons,
  .tx-badges,
  .md-header,
  .md-tabs,
  .md-sidebar,
  .md-footer {
    display: none !important;
  }

  .md-typeset .grid.cards > ul {
    grid-template-columns: 1fr;
  }
}