:root {
  /* Colors — Apple Dark Theme */
  --color-apple-blue: #0071e3;
  --color-link-blue: #2997ff;
  --color-signal-blue: #64d2ff;
  --color-carbon: #f5f5f7;
  --color-frost: #000000;
  --color-ice: #1c1c1e;
  --color-smoke: #e5e5ea;
  --color-graphite: #a1a1a6;
  --color-ash: #86868b;
  --color-mist: #333336;
  --color-onyx: #ffffff;
  --color-pebble: #2c2c2e;

  /* Typography */
  --font-sf-pro-display: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-sf-pro-text: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  /* Scale */
  --text-caption: 12px;
  --leading-caption: 1.33;
  --text-body-sm: 14px;
  --leading-body-sm: 1.29;
  --text-body: 17px;
  --leading-body: 1.47;
  --text-subheading: 21px;
  --leading-subheading: 1.24;
  --text-heading-sm: 28px;
  --leading-heading-sm: 1.18;
  --text-heading: 40px;
  --leading-heading: 1.14;
  --text-display: 56px;
  --leading-display: 1.07;

  /* Weights */
  --font-weight-light: 300;
  --font-weight-regular: 400;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Spacing */
  --spacing-4: 4px;
  --spacing-8: 8px;
  --spacing-12: 12px;
  --spacing-16: 16px;
  --spacing-20: 20px;
  --spacing-24: 24px;
  --spacing-40: 40px;
  --spacing-48: 48px;
  --spacing-56: 56px;
  --section-gap: 64px;

  /* Radii */
  --radius-cards: 12px;
  --radius-buttons: 980px;

  /* Dark Surfaces */
  --surface-canvas: #000000;
  --surface-elevated: #161617;
  --surface-card: #1c1c1e;
  --surface-card-hover: #2c2c2e;
}

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

body {
  font-family: var(--font-sf-pro-text);
  background-color: var(--surface-canvas);
  color: var(--color-carbon);
  font-size: var(--text-body);
  line-height: var(--leading-body);
  -webkit-font-smoothing: antialiased;
}

/* Global Nav */
.global-nav {
  width: 100%;
  background-color: rgba(22, 22, 23, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.global-nav.scrolled {
  background-color: rgba(0, 0, 0, 0.95);
  border-bottom-color: rgba(255, 255, 255, 0.15);
}

.nav-container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  font-family: var(--font-sf-pro-display);
  font-weight: var(--font-weight-bold);
  font-size: 18px;
  color: #ffffff;
  text-decoration: none;
  letter-spacing: -0.5px;
}

.nav-tabs {
  display: flex;
  gap: var(--spacing-24);
}

.nav-tab {
  font-size: var(--text-body-sm);
  font-weight: var(--font-weight-regular);
  color: var(--color-graphite);
  text-decoration: none;
  padding: var(--spacing-4) 0;
  position: relative;
  transition: color 0.2s ease;
}

.nav-tab:hover {
  color: #ffffff;
}

.nav-tab.active {
  color: #ffffff;
  font-weight: var(--font-weight-semibold);
}

.nav-tab.active::after {
  content: '';
  position: absolute;
  bottom: -15px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-apple-blue);
  box-shadow: 0 0 8px rgba(0, 113, 227, 0.6);
}

.social-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-16);
}

.social-links a {
  color: var(--color-graphite);
  transition: color 0.2s ease, transform 0.2s ease;
  display: flex;
  align-items: center;
}

.social-links a:hover {
  color: var(--color-link-blue);
  transform: translateY(-2px);
}

/* Disclaimer Bar */
.disclaimer-bar {
  background-color: #1c1c1e;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding: 10px 24px;
}

.disclaimer-content {
  max-width: 1140px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-12);
  font-size: var(--text-caption);
  color: var(--color-ash);
}

.disclaimer-badge {
  background-color: rgba(41, 151, 255, 0.15);
  color: var(--color-link-blue);
  font-weight: var(--font-weight-semibold);
  padding: 3px 10px;
  border-radius: var(--radius-buttons);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border: 1px solid rgba(41, 151, 255, 0.3);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 22px;
  border-radius: var(--radius-buttons);
  font-size: var(--text-body-sm);
  font-weight: var(--font-weight-regular);
  text-decoration: none;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
}

.btn-filled {
  background-color: var(--color-apple-blue);
  color: #ffffff;
  border: none;
}

.btn-filled:hover {
  background-color: #0077ed;
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(0, 113, 227, 0.4);
}

.btn-outlined {
  background-color: transparent;
  color: var(--color-link-blue);
  border: 1px solid var(--color-link-blue);
}

.btn-outlined:hover {
  background-color: rgba(41, 151, 255, 0.1);
  transform: translateY(-1px);
}

.btn-large {
  padding: 14px 28px;
  font-size: var(--text-body);
}

/* Hero Section */
.hero-section {
  padding: 100px 24px 70px;
  text-align: center;
  background-color: var(--surface-canvas);
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.hero-eyebrow {
  font-size: var(--text-body-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-signal-blue);
  text-transform: uppercase;
  letter-spacing: 1px;
  display: block;
  margin-bottom: var(--spacing-12);
}

.hero-headline {
  font-family: var(--font-sf-pro-display);
  font-size: var(--text-display);
  line-height: var(--leading-display);
  font-weight: var(--font-weight-semibold);
  color: #ffffff;
  margin-bottom: var(--spacing-16);
  letter-spacing: -1px;
}

.hero-subhead {
  font-size: var(--text-subheading);
  line-height: var(--leading-subheading);
  font-weight: var(--font-weight-light);
  color: var(--color-graphite);
  margin-bottom: var(--spacing-40);
  min-height: 32px;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: var(--spacing-16);
}

/* Stats Section */
.stats-section {
  padding: var(--section-gap) 24px;
  background-color: var(--surface-elevated);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.section-container {
  max-width: 1140px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-48);
}

.section-title {
  font-family: var(--font-sf-pro-display);
  font-size: var(--text-heading);
  line-height: var(--leading-heading);
  font-weight: var(--font-weight-semibold);
  color: #ffffff;
  margin-bottom: var(--spacing-8);
}

.section-subtitle {
  font-size: var(--text-body);
  font-weight: var(--font-weight-light);
  color: var(--color-ash);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--spacing-24);
  margin-bottom: var(--spacing-48);
}

.stat-card {
  background-color: var(--surface-card);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-cards);
  padding: 28px 24px;
  text-align: center;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.stat-card:hover {
  transform: translateY(-3px);
  border-color: rgba(41, 151, 255, 0.4);
}

.stat-value {
  font-family: var(--font-sf-pro-display);
  font-size: 38px;
  font-weight: var(--font-weight-semibold);
  color: #ffffff;
  line-height: 1.1;
  display: block;
  margin-bottom: var(--spacing-4);
}

.stat-label {
  font-size: var(--text-body-sm);
  color: var(--color-ash);
}

.github-card-wrapper {
  text-align: center;
  margin-top: var(--spacing-24);
}

.github-stat-img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-cards);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

/* About / Bio Section */
.about-section {
  padding: var(--section-gap) 24px;
  background-color: var(--surface-canvas);
}

.bio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-24);
}

.bio-card {
  background-color: var(--surface-card);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-cards);
  padding: 32px;
  transition: border-color 0.25s ease;
}

.bio-card:hover {
  border-color: rgba(255, 255, 255, 0.15);
}

.bio-card h3 {
  font-family: var(--font-sf-pro-display);
  font-size: var(--text-heading-sm);
  font-weight: var(--font-weight-semibold);
  color: #ffffff;
  margin-bottom: var(--spacing-16);
}

.bio-card p {
  font-size: var(--text-body);
  color: var(--color-graphite);
  margin-bottom: var(--spacing-16);
  line-height: 1.6;
}

.skills-wrapper {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-8);
  margin-top: var(--spacing-16);
}

.skill-pill {
  background-color: #2c2c2e;
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--color-carbon);
  font-size: var(--text-body-sm);
  padding: 6px 14px;
  border-radius: var(--radius-buttons);
  transition: all 0.2s ease;
}

.skill-pill:hover {
  background-color: var(--color-apple-blue);
  color: #ffffff;
  border-color: var(--color-apple-blue);
}

/* Projects Page */
.page-header {
  padding: 80px 24px 40px;
  text-align: center;
  background-color: var(--surface-canvas);
}

.header-content {
  max-width: 800px;
  margin: 0 auto;
}

.header-eyebrow {
  font-size: var(--text-body-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-signal-blue);
  text-transform: uppercase;
  letter-spacing: 1px;
  display: block;
  margin-bottom: var(--spacing-8);
}

.header-headline {
  font-family: var(--font-sf-pro-display);
  font-size: var(--text-heading);
  line-height: var(--leading-heading);
  font-weight: var(--font-weight-semibold);
  color: #ffffff;
  margin-bottom: var(--spacing-12);
}

.header-subhead {
  font-size: var(--text-subheading);
  font-weight: var(--font-weight-light);
  color: var(--color-graphite);
}

.projects-section {
  padding: 20px 24px var(--section-gap);
  background-color: var(--surface-canvas);
}

.projects-container {
  max-width: 1140px;
  margin: 0 auto;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-24);
  margin-bottom: var(--spacing-56);
}

.project-card {
  background-color: var(--surface-card);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-cards);
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.25s ease;
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: rgba(41, 151, 255, 0.4);
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-16);
}

.project-tag {
  font-size: var(--text-caption);
  color: var(--color-link-blue);
  background-color: rgba(41, 151, 255, 0.12);
  padding: 4px 10px;
  border-radius: var(--radius-buttons);
  font-weight: var(--font-weight-semibold);
}

.project-meta-top {
  font-size: var(--text-caption);
  color: var(--color-ash);
}

.project-title {
  font-family: var(--font-sf-pro-display);
  font-size: var(--text-heading-sm);
  line-height: var(--leading-heading-sm);
  font-weight: var(--font-weight-semibold);
  color: #ffffff;
  margin-bottom: var(--spacing-12);
}

.project-description {
  font-size: var(--text-body-sm);
  line-height: var(--leading-body-sm);
  color: var(--color-graphite);
  margin-bottom: var(--spacing-20);
  flex-grow: 1;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-8);
  margin-bottom: var(--spacing-24);
}

.tech-tag {
  font-size: 12px;
  color: var(--color-ash);
  background-color: #2c2c2e;
  padding: 3px 10px;
  border-radius: 4px;
}

.project-actions {
  display: flex;
  gap: var(--spacing-12);
}

.more-projects-callout {
  background-color: var(--surface-card);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-cards);
  padding: var(--spacing-48) 24px;
  text-align: center;
}

.callout-title {
  font-family: var(--font-sf-pro-display);
  font-size: var(--text-heading-sm);
  font-weight: var(--font-weight-semibold);
  color: #ffffff;
  margin-bottom: var(--spacing-8);
}

.callout-sub {
  font-size: var(--text-body);
  font-weight: var(--font-weight-light);
  color: var(--color-ash);
  margin-bottom: var(--spacing-24);
}

/* Footer */
.site-footer {
  background-color: var(--surface-elevated);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: var(--spacing-40) 24px;
  text-align: center;
}

.footer-container p {
  font-size: var(--text-caption);
  color: var(--color-ash);
  margin-bottom: var(--spacing-4);
}

/* Scroll Animations */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 768px) {
  .hero-headline {
    font-size: 40px;
  }
  .nav-container {
    flex-direction: column;
    gap: var(--spacing-12);
  }
  .disclaimer-content {
    flex-direction: column;
    text-align: center;
  }
}