/* ==========================================================================
   Luca Cioria — Personal Site
   Minimal, responsive, accessible. Light + dark themes.
   ========================================================================== */

/* --- Custom Properties (Light Theme) --- */
:root {
  --color-bg: #FAFAF9;
  --color-surface: #FFFFFF;
  --color-text: #1A1A1A;
  --color-text-secondary: #525252;
  --color-text-tertiary: #737373;
  --color-accent: #2563EB;
  --color-accent-hover: #1D4ED8;
  --color-border: #E5E5E5;
  --color-border-light: #F0F0F0;
  --color-code-bg: #F5F5F4;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'Cascadia Code', 'Fira Code', monospace;
  --max-width: 680px;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --radius: 8px;
  --transition: 150ms ease;
}

/* --- Dark Theme --- */
[data-theme="dark"] {
  --color-bg: #0A0A0A;
  --color-surface: #141414;
  --color-text: #E5E5E5;
  --color-text-secondary: #A3A3A3;
  --color-text-tertiary: #737373;
  --color-accent: #60A5FA;
  --color-accent-hover: #93C5FD;
  --color-border: #262626;
  --color-border-light: #1A1A1A;
  --color-code-bg: #1A1A1A;
}

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

/* --- Base --- */
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 5rem;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --- Skip Link --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  background: var(--color-accent);
  color: #fff;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius);
  z-index: 1000;
  font-weight: 500;
  text-decoration: none;
}

.skip-link:focus {
  top: var(--space-md);
}

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

/* --- Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border-light);
  backdrop-filter: blur(8px);
}

[data-theme="dark"] .site-header {
  background-color: rgba(10, 10, 10, 0.85);
}

[data-theme="light"] .site-header,
:root:not([data-theme]) .site-header {
  background-color: rgba(250, 250, 249, 0.85);
}

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

.logo {
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--color-text);
  text-decoration: none;
  font-family: var(--font-mono);
  letter-spacing: -0.02em;
}

.logo:hover {
  color: var(--color-accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition);
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--color-text);
}

#theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-sm);
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: color var(--transition), border-color var(--transition);
  width: 36px;
  height: 36px;
}

#theme-toggle:hover,
#theme-toggle:focus-visible {
  color: var(--color-text);
  border-color: var(--color-text-tertiary);
}

#theme-toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Show/hide sun/moon icons */
[data-theme="dark"] .icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: block; }
[data-theme="light"] .icon-sun,
:root:not([data-theme]) .icon-sun { display: none; }
[data-theme="light"] .icon-moon,
:root:not([data-theme]) .icon-moon { display: block; }

/* --- Hero --- */
.hero {
  padding: var(--space-4xl) 0 var(--space-3xl);
}

.hero-greeting {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-sm);
}

.hero h1 {
  font-size: clamp(2.25rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-md);
}

.hero-tagline {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
}

.hero-tagline a {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 500;
}

.hero-tagline a:hover {
  text-decoration: underline;
}

.hero-description {
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  max-width: 560px;
  line-height: 1.7;
}

/* --- Sections --- */
.section {
  padding: var(--space-3xl) 0;
  border-top: 1px solid var(--color-border-light);
}

.section h2 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-xl);
}

/* --- About --- */
.about-content p {
  margin-bottom: var(--space-md);
  color: var(--color-text-secondary);
}

.about-content p:last-child {
  margin-bottom: 0;
}

.about-content a {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 500;
}

.about-content a:hover {
  text-decoration: underline;
}

/* --- Work --- */
.work-item {
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-2xl);
  border-bottom: 1px solid var(--color-border-light);
}

.work-item:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.work-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-bottom: var(--space-xs);
}

.work-header h3 {
  font-size: 1.125rem;
  font-weight: 600;
}

.work-header h3 a {
  color: var(--color-text);
  text-decoration: none;
}

.work-header h3 a:hover {
  color: var(--color-accent);
}

.work-period {
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  color: var(--color-text-tertiary);
  white-space: nowrap;
}

.work-role {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.work-item > p:not(.work-role) {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

.work-highlights {
  list-style: none;
  padding: 0;
}

.work-highlights li {
  position: relative;
  padding-left: var(--space-lg);
  margin-bottom: var(--space-sm);
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
}

.work-highlights li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-accent);
  opacity: 0.6;
}

.work-highlights a {
  color: var(--color-accent);
  text-decoration: none;
}

.work-highlights a:hover {
  text-decoration: underline;
}

/* --- Writing --- */
.writing-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.writing-item {
  display: block;
  text-decoration: none;
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color var(--transition), background-color var(--transition);
}

.writing-item:hover,
.writing-item:focus-visible {
  border-color: var(--color-accent);
  background-color: var(--color-surface);
}

.writing-item:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.writing-meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.writing-meta time {
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  color: var(--color-text-tertiary);
}

.writing-source {
  font-size: 0.75rem;
  color: var(--color-accent);
  background: color-mix(in srgb, var(--color-accent) 10%, transparent);
  padding: 0.125rem 0.5rem;
  border-radius: 999px;
  font-weight: 500;
}

.writing-item h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.writing-item p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* --- Projects --- */
.projects-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.project-item {
  display: block;
  text-decoration: none;
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color var(--transition), background-color var(--transition);
}

a.project-item:hover,
a.project-item:focus-visible {
  border-color: var(--color-accent);
  background-color: var(--color-surface);
}

a.project-item:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.project-item h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.project-item h3 a {
  color: var(--color-text);
  text-decoration: none;
}

.project-item h3 a:hover {
  color: var(--color-accent);
}

.project-item p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* --- Contact --- */
.contact-text {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  max-width: 500px;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--color-text);
  font-size: 0.875rem;
  font-weight: 500;
  transition: border-color var(--transition), color var(--transition), background-color var(--transition);
}

.contact-link:hover,
.contact-link:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background-color: var(--color-surface);
}

.contact-link:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* --- Footer --- */
.site-footer {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--color-border-light);
}

.site-footer p {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
  text-align: center;
}

/* --- Focus Styles --- */
a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

/* --- Selection --- */
::selection {
  background-color: color-mix(in srgb, var(--color-accent) 25%, transparent);
}

/* --- Responsive --- */
@media (max-width: 480px) {
  .nav-links {
    gap: var(--space-md);
  }

  .nav-links a {
    font-size: 0.8125rem;
  }

  .hero {
    padding: var(--space-2xl) 0;
  }

  .section {
    padding: var(--space-2xl) 0;
  }

  .work-header {
    flex-direction: column;
    gap: var(--space-xs);
  }

  .contact-links {
    flex-direction: column;
  }

  .contact-link {
    justify-content: center;
  }
}