/* CSS Variables */
:root {
  /* Typography */
  --font-family-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --tracking-body: -0.01em;
  --tracking-tight: -0.03em;
  --line-height-body: 1.55;
  --line-height-compact: 1.35;

  /* Font Sizes */
  --font-size-small: 15px;
  --font-size-medium: 17px;
  --font-size-large: 20px;
  --font-size-extra-large: 28px;
  --font-size-extra-extra-large: 32px;

  /* Colors */
  --color-background: #fff;
  --color-background-secondary: #f1f1f1;
  --color-background-tertiary: #f5f5f5;
  --color-background-media: #f1f1f1; /* Always light for image/video containers */
  --color-text-primary: #000;
  --color-text-secondary: #666;
  --color-border: #e7e7e7;
  --color-shadow: rgba(0, 0, 0, 0.12);
  --color-selection-background: #000;
  --color-selection-text: #fff;

  /* 4px spacing grid */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-15: 60px;
  --space-20: 80px;
  --space-30: 120px;
  --content-margin: var(--space-20);
  --home-content-width: 560px;
  --home-primary-column: 180px;
  --home-column-gap: var(--space-5);
  --work-logo-size: var(--space-6);

  /* Border Radius */
  --border-radius-small: 4px;
  --border-radius-medium: 8px;
  --border-radius-large: 16px;
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
  :root {
    --color-background: #000;
    --color-background-secondary: #101010;
    --color-background-tertiary: #181818;
    --color-text-primary: #f2f2f2;
    --color-text-secondary: #a3a3a3;
    --color-border: #262626;
    --color-shadow: rgba(0, 0, 0, 0.7);
    --color-selection-background: #fff;
    --color-selection-text: #000;
  }

  /* Invert dark icons for visibility */
  .view-toggle img {
    filter: invert(1);
  }
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: var(--font-size-medium);
  scroll-behavior: smooth;
  font-family: var(--font-family-sans);
  color: var(--color-text-primary);
  text-rendering: optimizeLegibility;
  font-kerning: normal;
}

::selection {
  background: var(--color-selection-background);
  color: var(--color-selection-text);
}

body {
  font-weight: var(--font-weight-regular);
  line-height: var(--line-height-body);
  letter-spacing: var(--tracking-body);
  color: var(--color-text-primary);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  animation: page-fade-in 0.9s ease both;
}

@keyframes page-fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  body {
    animation: none;
  }

  .work-description-reveal {
    transition: none;
  }
}

/* Remove all focus outlines globally */
button:focus,
a:focus {
  outline: none;
}

p a {
  font-weight: var(--font-weight-medium);
  text-decoration: underline;
  color: var(--color-text-primary);
  text-decoration-thickness: 1px;
  text-underline-offset: var(--space-1);
}

/* Container */
.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Bookshelf gets full width container */
.bookshelf-container {
  max-width: 100%;
  padding: 0;
  overflow: visible;
}

/* Header */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-15) 0;
  max-width: 600px;
  margin: 0 auto;
  width: 100%;
}

.header-identity {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.header-photo {
  width: var(--space-8);
  height: var(--space-8);
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.name {
  font-size: var(--font-size-large);
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-compact);
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: var(--space-8);
}

.nav-link {
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-compact);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color 160ms ease;
}

.nav-link:hover {
  color: var(--color-text-primary);
}

/* Breadcrumb Header for Sub-pages */
.breadcrumb {
  font-size: var(--font-size-small);
  line-height: var(--line-height-compact);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
}

.header:has(.breadcrumb) {
  max-width: var(--home-content-width);
  padding-top: var(--space-15);
  padding-bottom: var(--space-15);
}

.breadcrumb-name {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  text-decoration: none;
  padding-right: var(--space-3);
  display: inline-flex;
  align-items: center;
}

.breadcrumb-name-thumb {
  display: block;
  width: var(--space-8);
  height: var(--space-8);
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.breadcrumb-name-text {
  display: none;
}

.breadcrumb-project {
  font-weight: var(--font-weight-regular);
  position: relative;
  display: inline-block;
}

.breadcrumb-project-trigger {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  padding: var(--space-1) var(--space-3);
  margin: -4px 0;
  border-radius: var(--border-radius-small);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  line-height: inherit;
  transition: background-color 120ms ease;
}

.breadcrumb-project-trigger:focus-visible {
  background-color: var(--color-background-secondary);
  outline: none;
}

.breadcrumb-project-trigger:active,
.breadcrumb-project.is-open .breadcrumb-project-trigger {
  background-color: var(--color-background-secondary);
}

@media (hover: hover) {
  .breadcrumb-project-trigger:hover {
    background-color: var(--color-background-secondary);
  }
}

.breadcrumb-project-label {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: calc(100vw - 200px);
}

.breadcrumb-chevron {
  flex-shrink: 0;
  transition: transform 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
  opacity: 0.7;
}

.breadcrumb-project.is-open .breadcrumb-chevron {
  transform: rotate(180deg);
}

.breadcrumb-menu {
  position: absolute;
  top: calc(100% + var(--space-2));
  left: 0;
  min-width: 280px;
  max-width: 360px;
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-large);
  box-shadow: 0 12px 32px var(--color-shadow);
  padding: var(--space-2);
  z-index: 50;
  opacity: 0;
  transform: translateY(-4px) scale(0.98);
  transform-origin: top left;
  pointer-events: none;
  transition: opacity 180ms ease, transform 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.breadcrumb-project.is-open .breadcrumb-menu {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.breadcrumb-menu-section {
  display: flex;
  flex-direction: column;
  padding: var(--space-1) 0;
}

.breadcrumb-menu-heading {
  font-size: 12px;
  font-weight: var(--font-weight-medium);
  letter-spacing: var(--tracking-body);
  color: var(--color-text-secondary);
  padding: var(--space-2) var(--space-3) var(--space-1);
}

.breadcrumb-menu-item {
  display: block;
  font-size: var(--font-size-small);
  color: var(--color-text-primary);
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--border-radius-medium);
  transition: background-color 120ms ease;
}

.breadcrumb-menu-item:focus-visible {
  background-color: var(--color-background-secondary);
  outline: none;
}

.breadcrumb-menu-item:active {
  background-color: var(--color-background-tertiary);
}

@media (hover: hover) {
  .breadcrumb-menu-item:hover {
    background-color: var(--color-background-secondary);
  }
}

.breadcrumb-menu-item.is-current {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  pointer-events: none;
}

.breadcrumb-menu-divider {
  height: 1px;
  background-color: var(--color-border);
  margin: var(--space-1) var(--space-2);
}

@media (max-width: 600px) {
  .breadcrumb-menu {
    min-width: 240px;
    max-width: calc(100vw - 48px);
  }

  .breadcrumb-project-trigger {
    padding: var(--space-2) var(--space-3);
    margin: -8px 0;
  }

  .breadcrumb-name {
    padding: var(--space-1) var(--space-3) var(--space-1) 0;
    margin: -4px 0;
  }

  .breadcrumb-menu-item {
    padding: var(--space-3);
  }
}

/* Main Content */
.home-page .container {
  max-width: var(--home-content-width);
}

.home-page .header {
  max-width: none;
  margin: 0;
}

.main {
  flex: 1;
  width: 100%;
  margin: 0;
}

/* Intro Section */
.intro {
  margin-bottom: var(--space-15);
}

/* Projects Section */
.projects {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-15);
}

/* Home page section label */
.section-label {
  font-size: var(--font-size-medium);
  font-weight: var(--font-weight-medium);
  letter-spacing: var(--tracking-body);
  line-height: var(--line-height-compact);
  color: var(--color-text-secondary);
  margin: 0 0 var(--space-1);
}

.project-card {
  display: grid;
  grid-template-columns: var(--home-primary-column) 1fr;
  column-gap: var(--home-column-gap);
  align-items: baseline;
  margin: 0;
  text-decoration: none;
  color: inherit;
}

.project-title {
  font-size: var(--font-size-medium);
  color: var(--color-text-primary);
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-compact);
}

.project-description {
  font-size: var(--font-size-medium);
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-regular);
  line-height: var(--line-height-compact);
  justify-self: end;
  text-align: right;
}

.page-title {
  font-size: var(--font-size-extra-extra-large);
  font-weight: var(--font-weight-medium);
  line-height: 1.1;
  letter-spacing: var(--tracking-tight);
  text-decoration: none;
  display: block;
  transition: opacity 0.2s ease;
  margin-bottom: 0;
  flex: 1;
}

/* Remove focus outlines */
*:focus,
*:focus-visible {
  outline: none;
}

.nav-link:focus,
.project-link:focus,
.page-title:focus {
  outline: none;
}

/* ===== PROJECT PAGE STYLES ===== */

/* Project Page Layout */
.project-main {
  flex: 1;
  width: 100%;
  max-width: var(--home-content-width);
  padding: 0 0 var(--space-15);
  margin: 0 auto;
}

.project-header {
  margin: 0 0 var(--space-6);
}

.project-header .page-title {
  margin-bottom: var(--space-6);
}

.project-section {
  margin-bottom: var(--space-10);
}

.section-header {
  font-size: var(--font-size-medium);
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-body);
  margin: 0 0 var(--space-2);
}

.section-text {
  font-size: var(--font-size-medium);
  font-weight: var(--font-weight-regular);
  line-height: 1.6;
  margin: 0 0 var(--space-8);
}

.section-list {
  font-size: var(--font-size-medium);
  font-weight: var(--font-weight-regular);
  line-height: 1.6;
  margin: 0 0 var(--space-8) 0;
  padding-left: var(--space-6);
}

.section-list li {
  margin-bottom: var(--space-4);
}

/* Project media shares the same column as the surrounding text. */
.project-image-full,
.project-image-centered,
.video-container,
.project-image-grid,
.project-image-grid-three,
.project-image-placeholder {
  width: 100%;
  max-width: 100%;
  margin-left: 0;
  margin-right: 0;
}

.project-image-full {
  display: block;
  height: auto;
  object-fit: contain;
  object-position: center;
  border-radius: var(--border-radius-large);
}
.project-video-small {
  width: auto;
  max-width: 100%;
  max-height: 520px;
}

.video-spaced {
  margin-top: var(--space-6);
  margin-bottom: var(--space-6);
}

.project-image-centered {
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: var(--color-background-media);
  border-radius: var(--border-radius-large);
}

.project-image-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  margin-top: var(--space-6);
  margin-bottom: var(--space-6);
  background-color: var(--color-background-media);
  border-radius: var(--border-radius-large);
}

.project-image-grid-three {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--space-6);
  margin-top: var(--space-15);
  margin-bottom: var(--space-15);
  background-color: var(--color-background-media);
  border-radius: var(--border-radius-large);
}

.project-image-grid-item {
  width: 100%;
  height: auto;
  object-fit: contain;
  display: block;
  border-radius: var(--border-radius-large);
}

.project-image-placeholder {
  min-height: 300px;
  background-color: var(--color-background-tertiary);
  border: 2px dashed var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: var(--space-15);
  margin-bottom: var(--space-15);
  border-radius: var(--border-radius-large);
}

.project-image-grid .project-image-placeholder {
  margin-top: 0;
  margin-bottom: 0;
  min-height: 200px;
}

.image-caption {
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-regular);
  line-height: 1.45;
  color: var(--color-text-secondary);
  text-align: center;
  font-style: italic;
  margin: 0;
  padding-top: var(--space-2);
}

.project-figure {
  margin: 0 0 var(--space-6);   /* space below the caption: 24px */
}

/* shrink the gap between a paragraph and an image that follows it */
.section-text:has(+ .project-figure) {
  margin-bottom: var(--space-4); /* 16px */
}

/* Button-style link for project pages */
.link-button {
  display: inline-block;
  background-color: var(--color-background-secondary);
  color: var(--color-text-primary);
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  padding: var(--space-1) var(--space-4);
  border-radius: var(--border-radius-medium);
  transition:
    background-color 0.2s ease,
    opacity 0.2s ease;
}

.link-button::after {
  content: ' ↗';
}

.link-button:hover {
  background-color: var(--color-background-tertiary);
  opacity: 0.9;
}

/* Hover-reveal controls over a video */
.video-container {
  position: relative;
}

.video-controls {
  position: absolute;
  bottom: var(--space-3);
  right: var(--space-3);
  display: flex;
  gap: var(--space-2);
  transition: opacity 0.15s ease;
}

@media (hover: hover) {
  .video-controls {
    opacity: 0;
    pointer-events: none;
  }

  .video-container:hover .video-controls {
    opacity: 1;
    pointer-events: auto;
  }
}

.video-control-button {
  background-color: rgba(0, 0, 0, 0.6);
  color: #fff;
  font: inherit;
  font-size: 14px;
  font-weight: var(--font-weight-medium);
  border: 0;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--border-radius-medium);
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.video-control-button:hover {
  background-color: rgba(0, 0, 0, 0.8);
}

/* ===== WORK HISTORY STYLES ===== */

.work-entry {
  margin: 0;
}

.work-item {
  display: grid;
  grid-template-columns: var(--home-primary-column) 1fr;
  column-gap: var(--home-column-gap);
  align-items: start;
  text-align: left;
  width: 100%;
  margin: 0;
  padding: 0;
  border: 0;
  background: none;
  color: inherit;
  font: inherit;
  appearance: none;
  cursor: pointer;
  text-decoration: none;
}

.work-item:focus-visible {
  outline: 1px solid var(--color-border);
  outline-offset: var(--space-1);
  border-radius: var(--border-radius-small);
}

.work-primary {
  display: flex;
  align-items: start;
  gap: var(--space-2);
}

.work-logo {
  display: none;
  width: var(--work-logo-size);
  height: var(--work-logo-size);
  border-radius: var(--border-radius-small);
  object-fit: contain;
  flex-shrink: 0;
}

.work-logo.border {
  border: 0.5px solid var(--color-border);
  background: transparent;
}

.work-company {
  font-size: var(--font-size-medium);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

/* Row hover underlines the primary label only. */
.project-title,
.work-company {
  text-decoration-line: underline;
  text-decoration-color: transparent;
  text-decoration-thickness: 1px;
  text-underline-offset: var(--space-1);
  transition: text-decoration-color 160ms ease;
}

.project-card:hover .project-title,
.work-item:hover .work-company,
.work-entry.is-open .work-company {
  text-decoration-color: currentColor;
}

.work-dates {
  font-size: var(--font-size-medium);
  font-weight: var(--font-weight-regular);
  line-height: var(--line-height-compact);
  color: var(--color-text-secondary);
  font-family: var(--font-family-sans);
  font-variant-numeric: tabular-nums;
  justify-self: end;
  text-align: right;
}

.work-description-reveal {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  transition:
    grid-template-rows 260ms cubic-bezier(0.2, 0.8, 0.2, 1),
    opacity 180ms ease;
}

.work-entry.is-open .work-description-reveal {
  grid-template-rows: 1fr;
  opacity: 1;
}

.work-description-inner {
  min-height: 0;
  overflow: hidden;
}

.work-description {
  margin: var(--space-2) 0 0;
  color: var(--color-text-secondary);
  font-size: var(--font-size-medium);
  font-weight: var(--font-weight-regular);
  line-height: var(--line-height-body);
  text-align: left;
}

/* ===== MOBILE BREAKPOINT ===== */
@media (max-width: 768px) {
  :root {
    --content-margin: var(--space-6);
  }

  /* Header stacks vertically with padding */
  .header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
    padding-left: var(--content-margin);
    padding-right: var(--content-margin);
    margin-left: 0;
    margin-right: 0;
  }

  .header-identity {
    width: 100%;
    justify-content: space-between;
  }

  .header-photo {
    order: 2;
  }

  .name {
    order: 1;
  }

  .home-page .main {
    padding-left: var(--content-margin);
    padding-right: var(--content-margin);
  }

  .project-main {
    padding-left: var(--content-margin);
    padding-right: var(--content-margin);
  }

  /* Project cards stack: description drops below the title */
  .project-card {
    grid-template-columns: 1fr;
    column-gap: 0;
    row-gap: var(--space-1);
  }

  .work-item {
    grid-template-columns: 1fr;
    row-gap: var(--space-1);
  }

  .project-description,
  .work-dates {
    justify-self: start;
    text-align: left;
  }

  /* More breathing room between stacked projects (kept on the 4px grid) */
   .projects {
    gap: var(--space-5);
  }
  }