/* ========================================
   DESIGN TOKENS
   ======================================== */

:root {
  /* Color — Light Mode */
  --surface-primary: #F6F5F1;
  --surface-secondary: #EDECEA;
  --surface-elevated: #FFFFFF;
  --text-primary: #1A1918;
  --text-secondary: #5C5A56;
  --text-tertiary: #8F8C87;
  --accent-primary: #2D5BDA;
  --accent-warm: #C45D3E;
  --accent-success: #2A7B5B;
  --border-subtle: #D8D6D2;
  --border-strong: #B0ADA8;

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

  --type-display: 3.5rem;
  --type-h1: 2.25rem;
  --type-h2: 1.5rem;
  --type-h3: 1.25rem;
  --type-body: 1rem;
  --type-small: 0.875rem;
  --type-label: 0.75rem;
  --type-code: 0.875rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Layout */
  --content-width: 720px;
  --content-wide: 1080px;

  /* Transitions */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
}

/* Dark Mode */
[data-theme="dark"] {
  --surface-primary: #131211;
  --surface-secondary: #1C1B19;
  --surface-elevated: #242320;
  --text-primary: #E8E6E1;
  --text-secondary: #A09D97;
  --text-tertiary: #6B6862;
  --accent-primary: #5B8AF5;
  --accent-warm: #E07558;
  --accent-success: #3DA87A;
  --border-subtle: #2A2926;
  --border-strong: #3D3B37;
}

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

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--type-body);
  line-height: 1.6;
  color: var(--text-secondary);
  background-color: var(--surface-primary);
  transition: background-color 300ms, color 300ms;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color 200ms;
}

a:hover {
  color: var(--text-primary);
}

a:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
  border-radius: 2px;
}

ul, ol {
  list-style: none;
}

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

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

/* ========================================
   SCROLL PROGRESS BAR
   ======================================== */

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0%;
  background: var(--accent-primary);
  z-index: 1000;
  transition: none;
}

/* ========================================
   NAVIGATION
   ======================================== */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--surface-primary) 80%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color 300ms, border-color 300ms;
}

.nav__inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.nav__home {
  font-family: var(--font-mono);
  font-size: var(--type-small);
  font-weight: 500;
  color: var(--text-primary);
  text-decoration: none;
  white-space: nowrap;
  letter-spacing: -0.01em;
  transition: color 200ms;
}

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

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.nav__links::-webkit-scrollbar {
  display: none;
}

.nav__link {
  font-family: var(--font-mono);
  font-size: var(--type-label);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: lowercase;
  color: var(--text-tertiary);
  text-decoration: none;
  white-space: nowrap;
  padding: var(--space-1) 0;
  transition: color 200ms;
}

.nav__link:hover,
.nav__link--active {
  color: var(--text-primary);
}

.theme-toggle {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  color: var(--text-tertiary);
  transition: color 200ms, background-color 200ms;
}

.theme-toggle:hover {
  color: var(--text-primary);
  background: var(--surface-secondary);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon,
.theme-toggle .icon-system {
  display: none;
}

[data-theme="light"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }
.theme-toggle .icon-system { display: block; }
[data-theme="light"] .theme-toggle .icon-system,
[data-theme="dark"] .theme-toggle .icon-system { display: none; }

/* Mobile dot indicator */
.mobile-progress {
  display: none;
}

@media (max-width: 1023px) {
  .mobile-progress {
    display: flex;
    position: fixed;
    top: 57px;
    left: 0;
    right: 0;
    z-index: 99;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-2) 0;
    background: color-mix(in srgb, var(--surface-primary) 80%, transparent);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
  }

  .mobile-progress__dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--border-subtle);
    transition: background-color 300ms, transform 300ms;
  }

  .mobile-progress__dot--active {
    background: var(--accent-primary);
    transform: scale(1.4);
  }
}

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

.main {
  position: relative;
}

.section {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--space-24) var(--space-6);
}

.section--wide {
  max-width: var(--content-wide);
}

.section-label {
  font-family: var(--font-mono);
  font-size: var(--type-label);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: var(--space-4);
}

.section-rule {
  border: none;
  height: 1px;
  background: var(--border-subtle);
  margin-bottom: var(--space-8);
  transition: background-color 300ms;
}

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

.hero {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--space-24) var(--space-6) var(--space-12);
}

.hero__bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 39px,
      var(--border-subtle) 39px,
      var(--border-subtle) 40px
    ),
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 39px,
      var(--border-subtle) 39px,
      var(--border-subtle) 40px
    );
  opacity: 0.03;
  z-index: -1;
}

[data-theme="dark"] .hero__bg {
  opacity: 0.05;
}

.hero__cursor {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  transition: opacity 300ms;
  z-index: 0;
}

.hero__content {
  position: relative;
  z-index: 1;
}

.hero__prompt {
  font-family: var(--font-mono);
  font-size: var(--type-label);
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  margin-bottom: var(--space-4);
}

.hero__name {
  font-family: var(--font-sans);
  font-size: var(--type-display);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: var(--space-4);
  transition: color 300ms;
}

.hero__tagline {
  font-size: var(--type-h3);
  font-weight: 400;
  color: var(--text-secondary);
  margin-bottom: var(--space-8);
  line-height: 1.4;
  transition: color 300ms;
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
}

.hero__meta-item {
  font-family: var(--font-mono);
  font-size: var(--type-small);
  color: var(--text-secondary);
  padding-left: var(--space-3);
  border-left: 3px solid var(--accent-primary);
  transition: color 300ms, border-color 300ms;
}

.hero__scroll-indicator {
  display: flex;
  justify-content: center;
  margin-top: var(--space-16);
}

.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: var(--text-tertiary);
  animation: pulse-line 2s ease-in-out infinite;
}

@keyframes pulse-line {
  0%, 100% { opacity: 0.2; }
  50% { opacity: 0.8; }
}

/* Hero stagger animation */
.hero__content > * {
  opacity: 0;
  transform: translateY(8px);
}

.hero--loaded .hero__content > * {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 300ms var(--ease-out-expo), transform 300ms var(--ease-out-expo);
}

.hero--loaded .hero__content > *:nth-child(1) { transition-delay: 200ms; }
.hero--loaded .hero__content > *:nth-child(2) { transition-delay: 240ms; }
.hero--loaded .hero__content > *:nth-child(3) { transition-delay: 280ms; }
.hero--loaded .hero__content > *:nth-child(4) { transition-delay: 320ms; }

.hero--loaded .hero__scroll-indicator {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 300ms var(--ease-out-expo) 400ms, transform 300ms var(--ease-out-expo) 400ms;
}

.hero__scroll-indicator {
  opacity: 0;
  transform: translateY(8px);
}

/* ========================================
   EXPERIENCE CARDS
   ======================================== */

.exp-card {
  display: grid;
  grid-template-columns: 30% 1fr;
  gap: var(--space-8);
  padding: var(--space-6) 0;
  border-left: 3px solid transparent;
  padding-left: var(--space-6);
  transition: border-color 300ms;
}

.exp-card:not(:last-child) {
  margin-bottom: var(--space-4);
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: var(--space-8);
}

.exp-card:hover {
  border-left-color: var(--accent-primary);
}

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

.exp-card__company {
  font-size: var(--type-code);
  font-weight: 500;
  color: var(--text-primary);
  transition: color 300ms;
}

.exp-card__location,
.exp-card__date {
  font-size: var(--type-label);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-top: var(--space-1);
  transition: color 300ms;
}

.exp-card__title {
  font-size: var(--type-h3);
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--space-3);
  line-height: 1.2;
  transition: color 300ms;
}

.exp-card__bullets {
  list-style: none;
}

.exp-card__bullets li {
  position: relative;
  padding-left: var(--space-4);
  margin-bottom: var(--space-2);
  color: var(--text-secondary);
  font-size: var(--type-body);
  line-height: 1.6;
  transition: color 300ms;
}

.exp-card__bullets li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--text-tertiary);
}

/* ========================================
   PROJECT CARDS
   ======================================== */

.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.project-card {
  padding: var(--space-6);
  background: var(--surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  transition: border-color 300ms, background-color 300ms, transform 200ms;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

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

.project-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.project-card__name {
  font-size: var(--type-h3);
  font-weight: 600;
  color: var(--text-primary);
  transition: color 300ms;
}

.project-card__status {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.project-card__status--active {
  background: var(--accent-success);
}

.project-card__status--archived {
  background: #C4960F;
}

[data-theme="dark"] .project-card__status--archived {
  background: #D4A72C;
}

.project-card__desc {
  color: var(--text-secondary);
  font-size: var(--type-body);
  line-height: 1.6;
  transition: color 300ms;
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: auto;
}

.tag {
  font-family: var(--font-mono);
  font-size: var(--type-label);
  font-weight: 500;
  letter-spacing: 0.04em;
  padding: var(--space-1) var(--space-2);
  background: var(--surface-secondary);
  color: var(--text-tertiary);
  border-radius: 4px;
  transition: background-color 300ms, color 300ms;
}

.project-card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--type-small);
  color: var(--accent-primary);
  margin-top: var(--space-2);
  transition: color 200ms;
}

.project-card__link:hover {
  color: var(--text-primary);
}

.project-card__link svg {
  width: 14px;
  height: 14px;
}

.project-card__links {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.project-card__links .project-card__link {
  margin-top: 0;
}

.project-card__link-sep {
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: var(--type-small);
  user-select: none;
}

.project-card__link--live {
  color: var(--accent-success);
}

.project-card__link--live:hover {
  color: var(--text-primary);
}

.projects-grid__note {
  grid-column: 1 / -1;
  font-family: var(--font-mono);
  font-size: var(--type-small);
  color: var(--text-tertiary);
  margin-bottom: var(--space-2);
}

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

.oss-card {
  padding: var(--space-6);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  transition: border-color 300ms, background-color 300ms;
}

.oss-card:not(:last-child) {
  margin-bottom: var(--space-4);
}

.oss-card:hover {
  border-color: var(--border-strong);
}

.oss-card__name {
  font-size: var(--type-h3);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
  transition: color 300ms;
}

.oss-card__desc {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-3);
  transition: color 300ms;
}

.oss-card__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.oss-card__link {
  font-family: var(--font-mono);
  font-size: var(--type-small);
  color: var(--accent-primary);
  transition: color 200ms;
}

.oss-card__link:hover {
  color: var(--text-primary);
}

/* ========================================
   COMMUNITY
   ======================================== */

.community-quote {
  font-size: var(--type-h2);
  font-style: italic;
  font-weight: 400;
  color: var(--text-secondary);
  line-height: 1.5;
  border-left: 3px solid var(--accent-warm);
  padding-left: var(--space-6);
  margin-bottom: var(--space-12);
  transition: color 300ms, border-color 300ms;
}

.timeline {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.timeline__item {
  padding-left: var(--space-6);
  border-left: 2px solid var(--border-subtle);
  position: relative;
  transition: border-color 300ms;
}

.timeline__item::before {
  content: '';
  position: absolute;
  left: -5px;
  top: 6px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-warm);
}

.timeline__title {
  font-size: var(--type-body);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-1);
  transition: color 300ms;
}

.timeline__desc {
  color: var(--text-secondary);
  font-size: var(--type-small);
  line-height: 1.6;
  transition: color 300ms;
}

/* ========================================
   CONTACT
   ======================================== */

.contact {
  text-align: center;
  padding-top: var(--space-32);
  padding-bottom: var(--space-32);
}

.contact__heading {
  font-size: var(--type-h1);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-8);
  transition: color 300ms;
}

.contact__links {
  display: flex;
  justify-content: center;
  gap: var(--space-8);
}

.contact__link {
  font-family: var(--font-mono);
  font-size: var(--type-body);
  color: var(--text-secondary);
  position: relative;
  padding-bottom: 2px;
  transition: color 200ms;
}

.contact__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent-primary);
  transition: width 300ms var(--ease-out-expo);
}

.contact__link:hover {
  color: var(--text-primary);
}

.contact__link:hover::after {
  width: 100%;
}

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

.footer {
  text-align: center;
  padding: var(--space-8) var(--space-6);
  border-top: 1px solid var(--border-subtle);
  transition: border-color 300ms;
}

.footer__text {
  font-size: var(--type-small);
  color: var(--text-tertiary);
  transition: color 300ms;
}

.footer__link {
  font-size: var(--type-small);
  color: var(--text-tertiary);
  transition: color 200ms;
}

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

/* ========================================
   COMMIT GRAPH SIDEBAR (Desktop)
   ======================================== */

.commit-graph {
  position: fixed;
  left: 60px;
  top: 0;
  height: 100vh;
  z-index: 50;
  pointer-events: none;
}

.commit-graph svg {
  height: 100%;
}

.commit-graph__dot {
  pointer-events: all;
  cursor: pointer;
  transition: fill 300ms, stroke 300ms;
}

@media (max-width: 1023px) {
  .commit-graph {
    display: none;
  }
}

@media (max-width: 1200px) and (min-width: 1024px) {
  .commit-graph {
    left: 20px;
  }
}

/* ========================================
   SCROLL REVEAL
   ======================================== */

.reveal {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 300ms var(--ease-out-expo), transform 300ms var(--ease-out-expo);
}

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

/* ========================================
   REDUCED MOTION
   ======================================== */

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

  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }

  .hero__content > * {
    opacity: 1;
    transform: none;
  }

  .hero__scroll-indicator {
    opacity: 1;
    transform: none;
  }

  .hero__cursor {
    display: none;
  }
}

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

@media (max-width: 768px) {
  :root {
    --type-display: 2.5rem;
    --type-h1: 1.75rem;
    --type-h2: 1.25rem;
    --type-h3: 1.125rem;
  }

  .nav__inner {
    padding: var(--space-3) var(--space-4);
  }

  .section {
    padding: var(--space-16) var(--space-4);
  }

  .hero {
    padding: var(--space-16) var(--space-4) var(--space-8);
  }

  .hero__meta {
    flex-direction: column;
    gap: var(--space-3);
  }

  .exp-card {
    grid-template-columns: 1fr;
    gap: var(--space-3);
    padding-left: var(--space-4);
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .contact__links {
    flex-direction: column;
    gap: var(--space-4);
  }
}

@media (max-width: 480px) {
  :root {
    --type-display: 2rem;
  }

  .nav__links {
    gap: var(--space-4);
  }
}