/**
 * Hero Header Styles for Zensical
 * 
 * Creates a full-width hero image header with transparent navbar overlay,
 * similar to zensical.org and mkdocs-material landing pages.
 * 
 * Usage: Add frontmatter to any page:
 *   hero_image: path/to/image.jpg
 *   hero_title: "Optional Title"
 *   hero_subtitle: "Optional subtitle text"
 *   hero_height: 60vh (40vh, 50vh, 60vh, 80vh, 100vh)
 *   hero_overlay: 0.4 (0-1, darkness of overlay)
 *   hero_align: center (left, center, right)
 */

/* ==========================================================================
   CSS Custom Properties
   ========================================================================== */

:root {
  --hero-height: 60vh;
  --hero-overlay-opacity: 0.2;
  --hero-overlay-top-opacity: 0.4;  /* Top header-area fade — light mode */
  --hero-title-color: #1a1a1a;
  --hero-subtitle-color: rgba(30, 30, 30, 0.9);
  --hero-overlay-color: 255, 255, 255; /* White for light theme */
  --hero-transition-duration: 0.3s;
}

/* Dark theme overrides */
[data-md-color-scheme="slate"] {
  --hero-overlay-top-opacity: 0.65; /* Stronger top fade needed in dark mode */
  --hero-title-color: #ffffff;
  --hero-subtitle-color: rgba(255, 255, 255, 0.9);
  --hero-overlay-color: 0, 0, 0; /* Black for dark theme */
}

/* ==========================================================================
   Hero Section Base Styles
   ========================================================================== */

.md-hero {
  position: relative;
  width: 100%;
  margin-top: calc(-1 * var(--md-header-height, 64px)); /* Pull up behind header */
  overflow: hidden;
}

.md-hero__image {
  position: relative;
  width: 100%;
  height: var(--hero-height);
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  display: flex;
  align-items: flex-end; /* Push content to bottom */
  justify-content: flex-start;
}

/* Scroll-down arrow for 100vh heroes */
.md-hero__scroll-arrow {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  background: none;
  border: none;
  cursor: pointer;
  color: var(--hero-title-color);
  width: 3rem;
  height: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
  opacity: 0.6;
  transition: opacity 0.2s ease;
  animation: hero-arrow-bounce 2s ease-in-out infinite;
}

.md-hero__scroll-arrow:hover {
  opacity: 1;
}

.md-hero__scroll-arrow svg {
  width: 2.5rem;
  height: 2.5rem;
}

@keyframes hero-arrow-bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(10px); }
}

/* Video background for hero (replaces background-image when hero_image is a video) */
.md-hero__video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  pointer-events: none; /* Prevents controls from ever appearing, even on hover */
}

/* Theme-dependent overlay for text readability */
.md-hero__overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    180deg,
    rgba(var(--hero-overlay-color), var(--hero-overlay-top-opacity)) 0%,  /* top fade — stronger in dark mode */
    rgba(var(--hero-overlay-color), 0) 20%,
    rgba(var(--hero-overlay-color), 0) 55%,
    rgba(var(--hero-overlay-color), var(--hero-overlay-opacity)) 100%
  );
  pointer-events: none;
}

.md-hero__inner {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 61rem; /* Match md-grid max-width */
  padding: 0 .4rem; /* Match md-header__inner padding */
  padding-left: calc(.4rem + .2rem + .4rem); /* header padding + button margin + button padding = align with logo */
  padding-bottom: 10vh; /* 10vh from bottom of hero image */
  margin: 0 auto;
}

/* ==========================================================================
   Hero Content & Typography
   ========================================================================== */

.md-hero__content {
  width: 100%;
  max-width: 800px;
  text-align: left; /* Always left-aligned with logo */
}

.md-hero__content--left,
.md-hero__content--center,
.md-hero__content--right {
  text-align: left;
  margin: 0;
}

.md-hero__title {
  color: var(--hero-title-color);
  font-size: clamp(1.6rem, 4vw, 2.8rem); /* 20% smaller */
  font-weight: 600; /* SemiBold */
  line-height: 0.84; /* 30% less than 1.2 */
  margin: 0 0 0.5rem 0;
  text-shadow: 0 2px 8px rgba(var(--hero-overlay-color), 0.3);
}

.md-hero__subtitle {
  color: var(--hero-subtitle-color);
  font-size: clamp(0.8rem, 1.6vw, 1.12rem); /* 20% smaller */
  font-weight: 400; /* Regular */
  font-style: italic;
  line-height: 1.05; /* 30% less than 1.5 */
  margin: 0;
  text-shadow: 0 1px 4px rgba(var(--hero-overlay-color), 0.3);
}

/* ==========================================================================
   Hero Buttons
   ========================================================================== */

.md-hero__buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.md-hero__content--center .md-hero__buttons {
  justify-content: center;
}

.md-hero__content--right .md-hero__buttons {
  justify-content: flex-end;
}

.md-hero__buttons .md-button {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 0.25rem;
  text-decoration: none;
  transition: all var(--hero-transition-duration) ease;
}

.md-hero__buttons .md-button--primary {
  background: var(--md-primary-fg-color, #4051b5);
  color: var(--md-primary-bg-color, #ffffff);
  border: 2px solid var(--md-primary-fg-color, #4051b5);
}

.md-hero__buttons .md-button--primary:hover {
  background: transparent;
  color: #ffffff;
  border-color: #ffffff;
}

.md-hero__buttons .md-button--secondary {
  background: transparent;
  color: #ffffff;
  border: 2px solid rgba(255, 255, 255, 0.8);
}

.md-hero__buttons .md-button--secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: #ffffff;
}

/* ==========================================================================
   Transparent Header When Hero Present
   ========================================================================== */

/* Make header transparent when hero is present */
html.has-hero .md-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: transparent;
  box-shadow: none;
  transition: background-color var(--hero-transition-duration) ease,
              box-shadow var(--hero-transition-duration) ease;
}

/* Header becomes solid when scrolled */
html.has-hero .md-header.md-header--scrolled {
  background: var(--md-default-bg-color, #ffffff);
  box-shadow: 0 0 0.2rem rgba(0, 0, 0, 0.1),
              0 0.2rem 0.4rem rgba(0, 0, 0, 0.2);
}

/* Adjust header text colors for transparent state - Light theme: dark text */
html.has-hero .md-header:not(.md-header--scrolled) .md-header__title,
html.has-hero .md-header:not(.md-header--scrolled) .md-header__topic,
html.has-hero .md-header:not(.md-header--scrolled) .md-header-nav__button {
  color: var(--hero-title-color);
  text-shadow: 0 1px 3px rgba(var(--hero-overlay-color), 0.3);
}

html.has-hero .md-header:not(.md-header--scrolled) .md-logo {
  filter: none; /* Keep original logo colors */
}

html.has-hero .md-header:not(.md-header--scrolled) .md-search__icon {
  color: var(--hero-title-color);
}

/* Dark mode: white text on transparent header */
html.has-hero [data-md-color-scheme="slate"] .md-header:not(.md-header--scrolled) .md-header__title,
html.has-hero [data-md-color-scheme="slate"] .md-header:not(.md-header--scrolled) .md-header__topic,
html.has-hero [data-md-color-scheme="slate"] .md-header:not(.md-header--scrolled) .md-header-nav__button {
  color: #ffffff;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

html.has-hero [data-md-color-scheme="slate"] .md-header:not(.md-header--scrolled) .md-logo {
  filter: brightness(0) invert(1);
}

html.has-hero [data-md-color-scheme="slate"] .md-header:not(.md-header--scrolled) .md-search__icon {
  color: #ffffff;
}

/* Dark mode adjustments */
html.has-hero [data-md-color-scheme="slate"] .md-header.md-header--scrolled {
  background: var(--md-default-bg-color);
}

/* ==========================================================================
   Hero Height Variations
   ========================================================================== */

html[data-hero-height="40vh"] .md-hero__image {
  height: 40vh;
}

html[data-hero-height="50vh"] .md-hero__image {
  height: 50vh;
}

html[data-hero-height="60vh"] .md-hero__image {
  height: 60vh;
}

html[data-hero-height="80vh"] .md-hero__image {
  height: 80vh;
}

html[data-hero-height="100vh"] .md-hero__image {
  height: 100vh;
}

/* ==========================================================================
   Responsive Adjustments
   ========================================================================== */

/* Tablet and below */
@media screen and (max-width: 960px) {
  .md-hero__inner {
    padding: 0 1.5rem;
    padding-bottom: 10vh;
  }

  .md-hero__title {
    font-size: clamp(1.4rem, 4vw, 2rem);
  }

  .md-hero__subtitle {
    font-size: clamp(0.75rem, 1.6vw, 0.95rem);
  }
}

/* Mobile */
@media screen and (max-width: 600px) {
  .md-hero__image {
    min-height: 300px;
  }

  .md-hero__buttons {
    flex-direction: column;
    align-items: stretch;
  }

  .md-hero__content--center .md-hero__buttons,
  .md-hero__content--right .md-hero__buttons {
    align-items: stretch;
  }

  .md-hero__buttons .md-button {
    text-align: center;
    width: 100%;
  }
}

/* ==========================================================================
   Page Menu Links (Horizontal Navigation Below Hero)
   ========================================================================== */

.md-hero__nav {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.md-hero__nav-inner {
  max-width: var(--md-grid-max-width, 1440px);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  justify-content: center;
  gap: 2rem;
}

.md-hero__nav-link {
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  padding: 1rem 0;
  font-size: 0.875rem;
  font-weight: 500;
  border-bottom: 2px solid transparent;
  transition: all var(--hero-transition-duration) ease;
}

.md-hero__nav-link:hover,
.md-hero__nav-link--active {
  color: #ffffff;
  border-bottom-color: var(--md-primary-fg-color, #4051b5);
}

@media screen and (max-width: 600px) {
  .md-hero__nav-inner {
    gap: 1rem;
    overflow-x: auto;
    justify-content: flex-start;
    padding: 0 1rem;
  }

  .md-hero__nav-link {
    white-space: nowrap;
    font-size: 0.8rem;
  }
}

/* ==========================================================================
   Print Styles
   ========================================================================== */

@media print {
  .md-hero {
    display: none;
  }

  html.has-hero .md-header {
    position: static;
    background: var(--md-default-bg-color, #ffffff);
  }
}

/* ==========================================================================
   Gantt Zoom Lightbox
   ========================================================================== */

.gantt-zoom svg {
  cursor: zoom-in;
  pointer-events: auto;
}

/* Mermaid diagram horizontal scroll */
.md-typeset .mermaid,
.md-typeset pre.mermaid,
.md-typeset .superfences-content {
  overflow-x: auto !important;
  overflow-y: visible !important;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 1rem;
  max-width: 100%;
  display: block;
}

.md-typeset .mermaid svg,
.md-typeset pre.mermaid svg,
.md-typeset .superfences-content svg {
  min-width: 1600px;
  min-height: 900px;
  height: auto;
  max-width: none !important;
}

@media screen and (max-width: 900px) {
  .md-typeset .mermaid svg,
  .md-typeset pre.mermaid svg,
  .md-typeset .superfences-content svg {
    min-width: 1400px;
    min-height: 800px;
  }
}

.gantt-lightbox {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.gantt-lightbox--open {
  display: flex;
}

.gantt-lightbox__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
}

.gantt-lightbox__content {
  position: relative;
  z-index: 1;
  background: var(--md-default-bg-color, #ffffff);
  border-radius: 10px;
  padding: 1rem 1.25rem 1.25rem;
  max-width: 95vw;
  max-height: 90vh;
  overflow: auto;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}

.gantt-lightbox__inner svg {
  width: 90vw;
  height: auto;
  max-height: 80vh;
}

.gantt-lightbox__close {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  border: 0;
  border-radius: 999px;
  width: 2rem;
  height: 2rem;
  background: rgba(0, 0, 0, 0.08);
  color: inherit;
  font-size: 1.1rem;
  cursor: pointer;
}

.gantt-lightbox__close:hover {
  background: rgba(0, 0, 0, 0.16);
}

.gantt-lightbox-open {
  overflow: hidden;
}

/* ==========================================================================
   3D Model Viewer (STL / STEP / OBJ via 3dviewer.net)
   ========================================================================== */

.model-viewer-3d {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 aspect ratio */
  margin: 1rem 0;
  border-radius: 4px;
  overflow: hidden;
  background: var(--md-default-bg-color, #f5f5f5);
}

.model-viewer-3d iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* ==========================================================================
   YouTube Embed
   ========================================================================== */

.youtube-embed {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 aspect ratio */
  margin: 1rem 0;
  border-radius: 4px;
  overflow: hidden;
  background: var(--md-default-bg-color, #f5f5f5);
}

.youtube-embed iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* ==========================================================================
   Autodesk A360 Embed
   ========================================================================== */

.autodesk-embed {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 aspect ratio */
  margin: 1rem 0;
  border-radius: 4px;
  overflow: hidden;
  background: var(--md-default-bg-color, #f5f5f5);
}

.autodesk-embed iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* ==========================================================================
   Right Side Navigation Panel - Native Zensical Styling
   ========================================================================== */

/* Let Zensical handle TOC styling natively */
.md-sidebar--secondary {
  display: flex !important;
}

/* Expand TOC sections by default - minimal override */
.md-nav--secondary .md-nav__toggle ~ .md-nav__list {
  display: block;
}

/* Hide right sidebar on small screens */
@media (max-width: 1219px) {
  .md-sidebar--secondary {
    display: none !important;
  }
}