/* ==========================================================================
   LEX FEFEGHA PORTFOLIO
   CSS Variables + Light/Dark Mode
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Theming)
   -------------------------------------------------------------------------- */

:root {
  /* Typography */
  --font-sans: 'Instrument Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: 'Instrument Serif', serif;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  
  /* Layout */
  --max-width: 720px;
  --border-radius: 4px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
}

/* Light Mode (default) — Warm Paper + Olive Accent */
[data-theme="light"] {
  --color-bg: #F7F5F2;
  --color-bg-elevated: #FFFFFF;
  --color-text: #1A1918;
  --color-text-secondary: #0e0e0e;
  --color-text-tertiary: #9C9A96;
  --color-accent: #5C6B4A;
  --color-accent-hover: #4A5A3A;
  --color-border: #E5E3E0;
  --color-border-subtle: #F0EEEB;
  --color-highlight: rgba(92, 107, 74, 0.1);
  --color-model-bg: #EDEBE8;
}

/* Dark Mode — Warm Black + Olive Accent */
[data-theme="dark"] {
  --color-bg: #141312;
  --color-bg-elevated: #1E1D1B;
  --color-text: #F5F4F2;
  --color-text-secondary: #A8A6A2;
  --color-text-tertiary: #6B6966;
  --color-accent: #8FA574;
  --color-accent-hover: #A3B88A;
  --color-border: #2E2D2A;
  --color-border-subtle: #232220;
  --color-highlight: rgba(143, 165, 116, 0.12);
  --color-model-bg: #1A1918;
}

/* --------------------------------------------------------------------------
   Reset & Base
   -------------------------------------------------------------------------- */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color var(--transition-base), color var(--transition-base);
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 400;
  line-height: 1.2;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent-hover);
}

em {
  font-style: italic;
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
}

@media (max-width: 640px) {
  .container {
    padding: var(--space-lg) var(--space-md);
  }
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */

.header {
  margin-bottom: var(--space-xl);
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-sm);
}

.name {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 400;
  letter-spacing: -0.02em;
  margin: 0;
}

.tagline {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.bio {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-style: italic;
  color: var(--color-text);
  margin-bottom: var(--space-lg);
}

.status {
  margin-bottom: var(--space-lg);
}

.status p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
}

.status a {
  color: var(--color-text);
  text-decoration: underline;
  text-decoration-color: var(--color-border);
  text-underline-offset: 2px;
}

.status a:hover {
  text-decoration-color: var(--color-accent);
}

.links {
  font-size: 0.875rem;
}

.links a {
  color: var(--color-text);
  text-decoration: underline;
  text-decoration-color: var(--color-border);
  text-underline-offset: 2px;
}

.links a:hover {
  text-decoration-color: var(--color-accent);
  color: var(--color-accent);
}

.separator {
  color: var(--color-text-tertiary);
  margin: 0 var(--space-xs);
}

/* --------------------------------------------------------------------------
   Theme Toggle
   -------------------------------------------------------------------------- */

.theme-toggle {
  appearance: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  width: 36px;
  height: 36px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.theme-toggle:hover {
  border-color: var(--color-text-secondary);
  background-color: var(--color-bg-elevated);
}

.theme-icon {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background-color: var(--color-text);
  transition: transform var(--transition-fast), background-color var(--transition-base);
}

[data-theme="dark"] .theme-icon {
  transform: scale(0.6);
  background-color: var(--color-text);
  box-shadow: 4px -4px 0 0 var(--color-text);
}

/* --------------------------------------------------------------------------
   3D Model Section
   -------------------------------------------------------------------------- */

.model-section {
  margin-bottom: var(--space-xl);
}

.model-container {
  width: 100%;
  height: 300px;
  background-color: var(--color-model-bg);
  border-radius: var(--border-radius);
  overflow: hidden;
  position: relative;
}

.model-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-tertiary);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.model-container canvas {
  width: 100% !important;
  height: 100% !important;
}

/* --------------------------------------------------------------------------
   Sections
   -------------------------------------------------------------------------- */

.section-title {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border-subtle);
}

section {
  margin-bottom: var(--space-2xl);
}

/* --------------------------------------------------------------------------
   Projects
   -------------------------------------------------------------------------- */

.projects-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.project {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

.project-media {
  width: 100%;
  aspect-ratio: 16 / 10;
  background-color: var(--color-model-bg);
  border-radius: var(--border-radius);
  overflow: hidden;
  position: relative;
}

.project-media img,
.project-media video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background-color: var(--color-bg);
}

.project-media-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-tertiary);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.project-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.project-header {
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.project-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--color-text);
  margin: 0;
}

.project-title a {
  color: inherit;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
}

.project-title a:hover {
  color: var(--color-accent);
}

.external-link-icon {
  flex-shrink: 0;
  opacity: 0.5;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.project-title a:hover .external-link-icon {
  opacity: 1;
  transform: translateX(2px) translateY(-2px);
}

.project-year {
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
}

.project-type {
  display: inline-block;
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-accent);
  background-color: var(--color-highlight);
  padding: 2px 8px;
  border-radius: 2px;
}

.project-description {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.project-collaborators {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
}

.project-collaborators a {
  color: var(--color-text-secondary);
}

/* --------------------------------------------------------------------------
   Lists (Press, Talks, Teaching)
   -------------------------------------------------------------------------- */

.press-list,
.talks-list,
.teaching-list {
  list-style: none;
}

.press-list li,
.talks-list li,
.teaching-list li {
  font-size: 0.9375rem;
  margin-bottom: var(--space-sm);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border-subtle);
}

.press-list li:last-child,
.talks-list li:last-child,
.teaching-list li:last-child {
  border-bottom: none;
}

.press-list a,
.talks-list a,
.teaching-list a {
  color: var(--color-text);
  text-decoration: underline;
  text-decoration-color: var(--color-border);
  text-underline-offset: 2px;
}

.press-list a:hover,
.talks-list a:hover,
.teaching-list a:hover {
  text-decoration-color: var(--color-accent);
  color: var(--color-accent);
}

.year {
  color: var(--color-text-tertiary);
  font-size: 0.8125rem;
}

.teaching-list em {
  color: var(--color-text-secondary);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */

.footer {
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border-subtle);
}

.colophon {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
}

/* --------------------------------------------------------------------------
   Utilities
   -------------------------------------------------------------------------- */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */

@media (max-width: 640px) {
  .name {
    font-size: 2rem;
  }
  
  .bio {
    font-size: 1.125rem;
  }
  
  .project-title {
    font-size: 1.25rem;
  }
  
  .model-container {
    height: 240px;
  }
}