/* =================================================================
   COLOR PALETTE & VARIABLES
   ================================================================= */

:root {
  /* Light mode colors */
  --bg-primary: #fafafa;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f4f4f5;
  --text-primary: #1a1a1a;
  --text-secondary: #52525b; /* Zinc-600 */
  --accent: #0d9488;
  --accent-hover: #0f766e;
  --border: #e4e4e7; /* Zinc-200 */
  --code-bg: #f4f4f5;

  /* Spacing scale */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
    sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --line-height: 1.6;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.2s ease;
  --transition-slow: 0.3s ease;
}

[data-theme='dark'] {
  /* Dark mode colors */
  --bg-primary: #09090b; /* Zinc-950 */
  --bg-secondary: #18181b; /* Zinc-900 */
  --bg-tertiary: #27272a; /* Zinc-800 */
  --text-primary: #f4f4f5; /* Zinc-100 */
  --text-secondary: #a1a1aa; /* Zinc-400 */
  --accent: #2dd4bf;
  --accent-hover: #5eead4;
  --border: #27272a; /* Zinc-800 */
  --code-bg: #27272a;
}

/* =================================================================
   RESET & BASE STYLES
   ================================================================= */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color var(--transition-slow),
    color var(--transition-slow);
}

/* Color transitions for all elements on theme change */
* {
  transition: background-color var(--transition-slow),
    color var(--transition-slow), border-color var(--transition-slow);
}

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

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

button {
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* =================================================================
   HEADER
   ================================================================= */

.header {
  position: sticky;
  top: 0;
  background-color: rgba(var(--bg-primary), 0.8); /* Fallback */
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 100;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-slow), background-color var(--transition-slow);
}

/* Add border only on scroll? Or always keep it subtle. */
.header {
  border-bottom: 1px solid var(--border);
}

.header-content {
  max-width: 720px;
  margin: 0 auto;
  padding: var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text-primary);
  text-decoration: none;
}

.logo:hover {
  color: var(--text-primary); /* No color change on hover */
}

.brand-slash {
  color: var(--accent);
  margin-right: 2px;
}

.theme-toggle {
  font-size: 18px;
  padding: 6px;
  border-radius: 50%;
  color: var(--text-secondary);
  transition: color var(--transition-base);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.8;
}

.theme-toggle:hover {
  color: var(--text-primary);
  background-color: var(--bg-tertiary);
  opacity: 1;
}

.theme-icon {
  display: inline-block;
  transition: transform 0.5s ease;
  color: currentColor; /* Force inheritance */
  font-family: sans-serif; /* Avoid emoji fonts */
}

[data-theme='dark'] .theme-icon {
  transform: rotate(180deg);
}

/* =================================================================
   MAIN LAYOUT
   ================================================================= */

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

section {
  margin: var(--space-3xl) 0;
}

.section-header {
  margin-bottom: var(--space-lg);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}

.section-header h2 {
  font-size: 20px;
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
}

.section-label {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent);
  margin-bottom: var(--space-md);
}

/* =================================================================
   HERO SECTION
   ================================================================= */

.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  /* Compressed vertical spacing */
  margin: var(--space-xl) 0;
}

.hero-photo {
  margin-bottom: var(--space-md);
}

.hero-photo img {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border); 
}

.hero-content {
  margin-bottom: var(--space-md);
}

.hero-name {
  font-size: 24px;
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-xs);
  letter-spacing: -0.5px;
  color: var(--text-primary);
}

.hero-tagline {
  font-size: 16px;
  font-weight: var(--font-weight-medium);
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
}

.hero-description {
  font-size: 15px;
  color: var(--text-secondary);
  max-width: 420px;
  margin: 0 auto;
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  justify-content: center;
  margin-top: var(--space-md);
}

.hero-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--text-secondary);
  font-weight: var(--font-weight-medium);
}

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

.link-icon {
  font-size: 16px;
}

/* =================================================================
   ABOUT SECTION (New Position)
   ================================================================= */

.about {
  margin: var(--space-xl) 0;
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--border);
}

.about-content {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-secondary);
}

.about-content p + p {
  margin-top: var(--space-md);
}

/* =================================================================
   LATEST SHIPS SECTION
   ================================================================= */

.ships-grid {
  display: grid;
  /* Force 3 equal columns */
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.ship-item {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px; /* Slightly tighter radius */
  overflow: hidden;
  display: flex;
  flex-direction: column;
  padding: var(--space-md);
  transition: all var(--transition-base);
}

.ship-item:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

/* Removed special styling for video-ship */

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

.ship-title {
  font-size: 15px;
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  margin-bottom: 4px;
  display: block;
}

.ship-badge {
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  color: var(--accent);
  background: rgba(13, 148, 136, 0.1);
  padding: 2px 6px;
  border-radius: 4px;
  margin-bottom: 2px;
}

[data-theme='dark'] .ship-badge {
  background: rgba(45, 212, 191, 0.1);
}

.ship-description {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  flex-grow: 1;
  line-height: 1.5;
}

.ship-actions {
  display: flex;
  margin-top: auto;
}

.ship-cta {
  width: 100%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  text-align: center;
  transition: all var(--transition-base);
  text-decoration: none;
}

.ship-cta.primary {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid transparent;
}

.ship-cta.primary:hover {
  background-color: var(--accent);
  color: white;
}


/* =================================================================
   PROJECTS SECTION (Grid)
   ================================================================= */

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-md);
}

.project-card {
  padding: var(--space-lg);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: border-color var(--transition-base), transform var(--transition-base);
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.project-title {
  font-size: 16px;
  font-weight: var(--font-weight-semibold);
  margin-bottom: 4px;
  color: var(--text-primary);
}

.project-subtitle {
  font-size: 13px;
  color: var(--accent);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-md);
}

.project-description {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
  flex-grow: 1;
  line-height: 1.6;
}

.project-link {
  font-size: 13px;
  font-weight: var(--font-weight-medium);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.external-link {
  font-size: 12px;
}

/* =================================================================
   OPEN SOURCE SECTION
   ================================================================= */

.open-source-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.open-source-item {
  display: block; /* Reset */
  padding: var(--space-md);
  border: 1px solid var(--border);
  border-radius: 8px;
  background-color: var(--bg-secondary);
}

.open-source-item:hover {
  border-color: var(--accent);
}

.open-source-item h4 {
  display: flex;
  align-items: center;
  margin-bottom: 4px;
  font-size: 15px;
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
}

.star-count {
  font-size: 12px;
  color: var(--text-secondary);
  margin-left: 8px;
  font-weight: normal;
}

.open-source-item p {
  display: block;
  margin-bottom: var(--space-sm);
  font-size: 14px;
  color: var(--text-secondary);
}

.open-source-item a {
  font-size: 13px;
  font-weight: var(--font-weight-medium);
}


/* =================================================================
   PAST TALKS (Expando)
   ================================================================= */

.past-talks-section {
  text-align: center;
  margin-top: var(--space-3xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--border);
}

.toggle-button {
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: var(--font-weight-medium);
  padding: 8px 16px;
  border-radius: 99px;
  border: 1px solid var(--border);
  transition: all var(--transition-base);
}

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

.past-talks-container {
  margin-top: var(--space-lg);
  text-align: left;
}

.past-talks-container.hidden {
  display: none;
}

.past-talks-container h4 {
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  text-align: center;
}

.past-talks-list {
  list-style: none;
  max-width: 500px;
  margin: 0 auto;
}

.past-talks-list li {
  font-size: 14px;
  color: var(--text-secondary);
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  text-align: center;
}

.past-talks-list li:last-child {
  border-bottom: none;
}


/* =================================================================
   FOOTER
   ================================================================= */

.footer {
  margin-top: var(--space-3xl);
  padding: var(--space-xl) var(--space-md);
  text-align: center;
  /* border-top handled by past talks section if visible, 
     but let's keep footer distinct */
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
  margin-bottom: var(--space-md);
}

.footer-links a {
  font-size: 13px;
  color: var(--text-secondary);
}

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

.footer-text {
  font-size: 12px;
  color: var(--text-secondary);
  opacity: 0.6;
}

/* =================================================================
   ANIMATIONS
   ================================================================= */

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.reveal {
  opacity: 0;
  animation: fadeIn 0.6s ease-out forwards;
}

.reveal:nth-child(1) { animation-delay: 0.1s; }
.reveal:nth-child(2) { animation-delay: 0.15s; }
.reveal:nth-child(3) { animation-delay: 0.2s; }
.ships-grid .reveal:nth-child(1) { animation-delay: 0.1s; }
.ships-grid .reveal:nth-child(2) { animation-delay: 0.2s; }
.ships-grid .reveal:nth-child(3) { animation-delay: 0.3s; }

/* =================================================================
   RESPONSIVE
   ================================================================= */

@media (max-width: 640px) {
  .ships-grid {
    grid-template-columns: 1fr; /* Stack on mobile */
  }
  
  .hero-name {
    font-size: 24px;
  }
  
  .hero-tagline {
    font-size: 16px;
  }
}