/* ==========================================================================
   CSS Custom Properties & Theme
   ========================================================================== */

:root {
  /* Palette */
  --lavender: #EEEBFE;
  --lavender-2: #EBEAFE;
  --lavender-3: #E5E6FE;
  --pale-slate: #BCC7D8;
  --blue-slate: #4D7784;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Sizing */
  --max-width: 720px;
  --stepper-width: 100px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;

  /* Light theme (default) */
  --color-bg: var(--lavender);
  --color-bg-alt: var(--lavender-2);
  --color-surface: var(--lavender-3);
  --color-border: var(--pale-slate);
  --color-text: #1a1a2e;
  --color-text-muted: #4a4a5a;
  --color-accent: var(--blue-slate);
  --color-accent-hover: #3d6570;
  --step-marker-bg: var(--blue-slate);
  --step-marker-border: var(--pale-slate);
  --step-connector: var(--pale-slate);
}

/* Dark theme */
[data-theme="dark"] {
  --color-bg: #1a1a2e;
  --color-bg-alt: #25253a;
  --color-surface: #2d2d44;
  --color-border: #3d3d5c;
  --color-text: var(--lavender);
  --color-text-muted: var(--pale-slate);
  --color-accent: var(--lavender-3);
  --color-accent-hover: #ffffff;
  --step-marker-bg: var(--lavender-3);
  --step-marker-border: var(--pale-slate);
  --step-connector: var(--pale-slate);
}

/* System preference fallback */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #1a1a2e;
    --color-bg-alt: #25253a;
    --color-surface: #2d2d44;
    --color-border: #3d3d5c;
    --color-text: var(--lavender);
    --color-text-muted: var(--pale-slate);
    --color-accent: var(--lavender-3);
    --color-accent-hover: #ffffff;
    --step-marker-bg: var(--lavender-3);
    --step-marker-border: var(--pale-slate);
    --step-connector: var(--pale-slate);
  }
}

/* ==========================================================================
   Base Styles
   ========================================================================== */

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

html {
  font-size: 16px;
  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);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-base), color var(--transition-base);
}

/* ==========================================================================
   Typography
   ========================================================================== */

.heading-primary {
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.heading-secondary {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.subtitle {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.text {
  color: var(--color-text);
  max-width: 55ch;
}

.mono {
  font-family: var(--font-mono);
}

/* ==========================================================================
   Header
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md) var(--space-lg);
  transition: background-color var(--transition-base), border-color var(--transition-base);
}

.header-content {
  max-width: calc(var(--max-width) + var(--stepper-width) + var(--space-xl));
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-accent);
}

/* Theme Toggle */
.theme-toggle {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 9999px;
  padding: var(--space-xs) var(--space-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 1rem;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.theme-toggle:hover {
  background-color: var(--color-bg-alt);
}

.theme-toggle .sun,
.theme-toggle .moon {
  display: inline-block;
  transition: opacity var(--transition-fast);
}

/* Light mode: show sun, hide moon */
:root:not([data-theme="dark"]) .theme-toggle .moon {
  opacity: 0.3;
}

:root:not([data-theme="dark"]) .theme-toggle .sun {
  opacity: 1;
}

/* Dark mode: show moon, hide sun */
[data-theme="dark"] .theme-toggle .sun {
  opacity: 0.3;
}

[data-theme="dark"] .theme-toggle .moon {
  opacity: 1;
}

/* System dark preference */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .sun {
    opacity: 0.3;
  }
  :root:not([data-theme="light"]) .theme-toggle .moon {
    opacity: 1;
  }
}

/* ==========================================================================
   Main Content
   ========================================================================== */

.main-content {
  flex: 1;
  padding: var(--space-2xl) var(--space-lg);
}

.pipeline-layout {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-2xl);
}

/* ==========================================================================
   Content Column
   ========================================================================== */

.content-column {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xl);
}

.section {
  padding-bottom: var(--space-lg);
}

.section--intro {
  padding-top: var(--space-sm);
}

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

.intro-text {
  flex: 1;
}

/* Location */
.location {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

.location__icon {
  font-size: 1rem;
}

/* Links */
.link-list {
  list-style: none;
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.link-list li {
  margin-bottom: 0;
}

/* Profile Image */
.profile-image {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--color-border);
  flex-shrink: 0;
  transition: border-color var(--transition-base);
}

.link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 500;
  padding: var(--space-sm) var(--space-md);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  transition: all var(--transition-fast);
}

.link__icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.link:hover {
  color: var(--color-accent-hover);
  background-color: var(--color-bg-alt);
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.link__label {
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  padding: var(--space-lg);
  border-top: 1px solid var(--color-border);
  text-align: center;
  transition: border-color var(--transition-base);
}

.footer-text {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* ==========================================================================
   Responsive Styles
   ========================================================================== */

/* Mobile */
@media (max-width: 480px) {
  html {
    font-size: 15px;
  }

  .site-header {
    padding: var(--space-sm) var(--space-md);
  }

  .main-content {
    padding: var(--space-xl) var(--space-md);
  }

  .intro-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-lg);
  }

  .profile-image {
    width: 100px;
    height: 100px;
  }

  .content-column {
    gap: var(--space-xl);
  }

  .link-list {
    flex-direction: column;
  }

  .link {
    width: 100%;
  }
}