/* ═══════════════════════════════════════════════════════════════
   NOTHING DESIGN SYSTEM — LIGHT THEME DEFAULT
   Fonts: Doto (display), Space Grotesk (body), Space Mono (data)
   ═══════════════════════════════════════════════════════════════ */

/* --- TOKENS --- */
:root {
  /* Light mode (default) */
  --black: #F5F5F5;
  --surface: #FFFFFF;
  --surface-raised: #F0F0F0;
  --border: #E8E8E8;
  --border-visible: #CCCCCC;
  --text-disabled: #999999;
  --text-secondary: #666666;
  --text-primary: #1A1A1A;
  --text-display: #000000;
  --accent: #D71921;
  --accent-subtle: rgba(215,25,33,0.08);
  --success: #4A9E5C;
  --warning: #D4A843;
  --interactive: #007AFF;

  /* Spacing */
  --space-2xs: 2px;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;

  /* Motion */
  --ease: cubic-bezier(0.25, 0.1, 0.25, 1);
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 400ms;
}

/* Dark mode */
body.dark {
  --black: #000000;
  --surface: #111111;
  --surface-raised: #1A1A1A;
  --border: #222222;
  --border-visible: #333333;
  --text-disabled: #666666;
  --text-secondary: #999999;
  --text-primary: #E8E8E8;
  --text-display: #FFFFFF;
  --interactive: #5B9BF6;
  --accent-subtle: rgba(215,25,33,0.15);
}

/* --- RESET --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-weight: 400;
  font-size: 16px;
  line-height: 1.5;
  color: var(--text-primary);
  background: var(--black);
  transition: background var(--duration-slow) var(--ease), color var(--duration-slow) var(--ease);
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* --- ICONS --- */
.icon-sm { width: 16px; height: 16px; flex-shrink: 0; }
.icon-md { width: 24px; height: 24px; flex-shrink: 0; }

/* --- THEME TOGGLE --- */
.theme-toggle {
  position: fixed;
  top: var(--space-lg);
  right: var(--space-lg);
  z-index: 1000;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  background: var(--surface);
  border: 1px solid var(--border-visible);
  border-radius: 999px;
  padding: 6px 14px;
  cursor: pointer;
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
  transition: all var(--duration-normal) var(--ease);
}
.theme-toggle:hover {
  color: var(--text-display);
  border-color: var(--text-primary);
}
.theme-toggle svg { transition: transform var(--duration-normal) var(--ease); }
.theme-toggle:hover svg { transform: rotate(30deg); }

/* --- CHAPTER NAV --- */
.chapter-nav {
  position: fixed;
  right: var(--space-lg);
  top: 50%;
  transform: translateY(-50%);
  z-index: 100;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}
.chapter-nav__items { display: flex; flex-direction: column; gap: var(--space-md); }
.chapter-nav__item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  transition: all var(--duration-normal) var(--ease);
}
.chapter-nav__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border-visible);
  transition: all var(--duration-normal) var(--ease);
}
.chapter-nav__label {
  font-family: 'Space Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--text-disabled);
  opacity: 0;
  transform: translateX(8px);
  transition: all var(--duration-normal) var(--ease);
  white-space: nowrap;
}
.chapter-nav__item:hover .chapter-nav__label,
.chapter-nav__item.active .chapter-nav__label {
  opacity: 1;
  transform: translateX(0);
}
.chapter-nav__item.active .chapter-nav__dot {
  background: var(--accent);
  transform: scale(1.4);
}
.chapter-nav__item:hover .chapter-nav__dot {
  background: var(--text-primary);
  transform: scale(1.2);
}

@media (max-width: 768px) {
  .chapter-nav { display: none; }
  .theme-toggle { top: var(--space-md); right: var(--space-md); }
}

/* --- HERO --- */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding: var(--space-4xl) var(--space-3xl);
  position: relative;
  overflow: hidden;
}
.dot-grid-bg {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, var(--border-visible) 0.8px, transparent 0.8px);
  background-size: 24px 24px;
  opacity: 0.4;
  pointer-events: none;
}
.hero__content { position: relative; z-index: 1; max-width: 900px; }
.hero__label {
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}
.hero__name {
  font-family: 'Doto', 'Space Mono', monospace;
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--text-display);
  margin-bottom: var(--space-lg);
}
.hero__name-line {
  display: block;
  font-size: clamp(56px, 12vw, 120px);
}
.hero__tagline {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(18px, 3vw, 28px);
  font-weight: 300;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}
.hero__location {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: 'Space Mono', monospace;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
}

/* Scroll hint */
.hero__scroll-hint {
  position: absolute;
  bottom: var(--space-2xl);
  left: var(--space-3xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  font-family: 'Space Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--text-disabled);
  animation: fadeInUp 1s var(--ease) 1s both;
}
.hero__scroll-line {
  width: 1px;
  height: 48px;
  background: var(--border-visible);
  position: relative;
  overflow: hidden;
}
.hero__scroll-line::after {
  content: '';
  position: absolute;
  top: -100%;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--text-display);
  animation: scrollLine 2s var(--ease) infinite;
}

@keyframes scrollLine {
  0% { top: -100%; }
  50% { top: 100%; }
  100% { top: 100%; }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
  .hero { padding: var(--space-3xl) var(--space-lg); }
  .hero__scroll-hint { left: var(--space-lg); bottom: var(--space-xl); }
}

/* --- SECTIONS --- */
.section {
  padding: var(--space-4xl) var(--space-3xl);
  position: relative;
}
.container { max-width: 1000px; margin: 0 auto; }
.section__chapter {
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: var(--space-sm);
}
.section__title {
  font-family: 'Doto', 'Space Mono', monospace;
  font-size: clamp(36px, 6vw, 56px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-display);
  margin-bottom: var(--space-md);
  line-height: 1.05;
}
.section__subtitle {
  font-size: 18px;
  font-weight: 300;
  color: var(--text-secondary);
  max-width: 560px;
  margin-bottom: var(--space-2xl);
  line-height: 1.5;
}

@media (max-width: 768px) {
  .section { padding: var(--space-3xl) var(--space-lg); }
}

/* --- ABOUT --- */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: start;
}
.about__text p {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}
.about__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  transition: border-color var(--duration-normal) var(--ease);
}
.stat-card:hover { border-color: var(--text-secondary); }
.stat-card__number {
  font-family: 'Doto', 'Space Mono', monospace;
  font-size: 48px;
  font-weight: 700;
  color: var(--text-display);
  line-height: 1;
  display: inline;
}
.stat-card__unit {
  font-family: 'Space Mono', monospace;
  font-size: 24px;
  color: var(--text-secondary);
  vertical-align: super;
}
.stat-card__label {
  font-family: 'Space Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  margin-top: var(--space-sm);
}

@media (max-width: 768px) {
  .about__grid { grid-template-columns: 1fr; }
  .about__stats { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .about__stats { grid-template-columns: 1fr; }
}

/* --- TIMELINE --- */
.timeline {
  position: relative;
  padding-left: var(--space-2xl);
}
.timeline__line {
  position: absolute;
  left: 7px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--border-visible);
}
.timeline__item {
  position: relative;
  padding-bottom: var(--space-2xl);
}
.timeline__item:last-child { padding-bottom: 0; }
.timeline__marker {
  position: absolute;
  left: calc(-1 * var(--space-2xl) + 2px);
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border-visible);
  border: 2px solid var(--black);
  transition: all var(--duration-normal) var(--ease);
  z-index: 1;
}
.timeline__item:hover .timeline__marker {
  background: var(--accent);
  transform: scale(1.4);
}
.timeline__marker--origin {
  background: var(--accent);
  width: 12px;
  height: 12px;
  left: calc(-1 * var(--space-2xl) + 1px);
}
.timeline__content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: var(--space-lg);
  transition: border-color var(--duration-normal) var(--ease);
}
.timeline__item:hover .timeline__content { border-color: var(--text-secondary); }
.timeline__date {
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--text-disabled);
}
.timeline__role {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 20px;
  font-weight: 500;
  color: var(--text-display);
  margin-top: var(--space-xs);
  line-height: 1.3;
}
.timeline__company {
  font-family: 'Space Mono', monospace;
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: var(--space-2xs);
}
.timeline__desc {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: var(--space-sm);
  line-height: 1.6;
}

/* --- CRAFT --- */
.craft__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
}
.craft__category-title {
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
}
.craft__tags { display: flex; flex-wrap: wrap; gap: var(--space-sm); }

/* Tags */
.tag {
  font-family: 'Space Mono', monospace;
  font-size: 12px;
  letter-spacing: 0.04em;
  padding: 6px 14px;
  border: 1px solid var(--border-visible);
  border-radius: 999px;
  color: var(--text-primary);
  transition: all var(--duration-normal) var(--ease);
  cursor: default;
  white-space: nowrap;
}
.tag:hover {
  border-color: var(--text-display);
  color: var(--text-display);
  transform: translateY(-2px);
}
.tag--accent {
  border-color: var(--accent);
  color: var(--accent);
}
.tag--accent:hover {
  background: var(--accent-subtle);
  border-color: var(--accent);
  color: var(--accent);
}
.tag--sm { font-size: 10px; padding: 3px 10px; }

@media (max-width: 768px) {
  .craft__grid { grid-template-columns: 1fr; }
}

/* --- PROJECTS --- */
.project-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: var(--space-lg);
  transition: all var(--duration-normal) var(--ease);
  cursor: pointer;
}
.project-card:hover {
  border-color: var(--text-secondary);
  transform: translateY(-4px);
}
.project-card--hero {
  padding: var(--space-2xl);
  margin-bottom: var(--space-xl);
  border-color: var(--border-visible);
}
.project-card--hero:hover {
  border-color: var(--accent);
}
.project-card--hero .project-card__title {
  font-family: 'Doto', 'Space Mono', monospace;
  font-size: 36px;
}
.project-card__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-md);
}
.project-card__label {
  font-family: 'Space Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--text-disabled);
}
.project-card__header .icon-sm {
  color: var(--text-disabled);
  transition: all var(--duration-normal) var(--ease);
}
.project-card:hover .project-card__header .icon-sm {
  color: var(--text-display);
  transform: translate(2px, -2px);
}
.project-card__title {
  font-size: 22px;
  font-weight: 500;
  color: var(--text-display);
  margin-bottom: var(--space-sm);
  line-height: 1.2;
}
.project-card__desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-md);
}
.project-card__tags { display: flex; flex-wrap: wrap; gap: 6px; }

.projects__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

@media (max-width: 768px) {
  .projects__grid { grid-template-columns: 1fr; }
}

/* --- VOICE --- */
.voice__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
}
.voice__heading {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--border);
}

/* Writing cards */
.writing-card {
  display: flex;
  flex-direction: column;
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--border);
  transition: all var(--duration-normal) var(--ease);
}
.writing-card:hover { padding-left: var(--space-md); }
.writing-card__pub {
  font-family: 'Space Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--text-disabled);
  margin-bottom: var(--space-xs);
}
.writing-card__title {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-display);
  line-height: 1.4;
  margin-bottom: var(--space-xs);
  transition: color var(--duration-normal) var(--ease);
}
.writing-card:hover .writing-card__title { color: var(--accent); }
.writing-card__date {
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  color: var(--text-disabled);
}

/* Speaking cards */
.speaking-card {
  display: flex;
  flex-direction: column;
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--border);
  transition: all var(--duration-normal) var(--ease);
}
.speaking-card:hover { padding-left: var(--space-md); }
.speaking-card__date {
  font-family: 'Space Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: var(--space-xs);
}
.speaking-card__title {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-display);
  line-height: 1.4;
  margin-bottom: var(--space-xs);
}
.speaking-card__event {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.4;
}

@media (max-width: 768px) {
  .voice__grid { grid-template-columns: 1fr; }
}

/* --- CONNECT --- */
.connect { min-height: 100vh; display: flex; flex-direction: column; justify-content: center; }
.connect__content { max-width: 700px; }
.connect__title {
  font-family: 'Doto', 'Space Mono', monospace;
  font-size: clamp(42px, 8vw, 72px);
  font-weight: 700;
  line-height: 1.0;
  letter-spacing: -0.03em;
  color: var(--text-display);
  margin-bottom: var(--space-lg);
}
.connect__subtitle {
  font-size: 18px;
  font-weight: 300;
  color: var(--text-secondary);
  margin-bottom: var(--space-2xl);
  line-height: 1.6;
}
.connect__links { display: flex; flex-direction: column; gap: 0; }
.connect__link {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--border);
  transition: all var(--duration-normal) var(--ease);
}
.connect__link:first-child { border-top: 1px solid var(--border); }
.connect__link:hover { padding-left: var(--space-md); }
.connect__link svg {
  color: var(--text-disabled);
  transition: color var(--duration-normal) var(--ease);
}
.connect__link:hover svg { color: var(--text-display); }
.connect__link-label {
  font-family: 'Space Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--text-disabled);
  display: block;
}
.connect__link-value {
  font-size: 15px;
  color: var(--text-display);
  display: block;
  margin-top: 2px;
  transition: color var(--duration-normal) var(--ease);
}
.connect__link:hover .connect__link-value { color: var(--accent); }

/* --- FOOTER --- */
.footer {
  padding: var(--space-3xl) 0 var(--space-2xl);
  margin-top: auto;
  text-align: center;
}
.footer__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: 'Space Mono', monospace;
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
  padding: 14px 32px;
  border: 1px solid var(--border-visible);
  border-radius: 999px;
  transition: all var(--duration-normal) var(--ease);
}
.footer__cta:hover {
  color: var(--text-display);
  border-color: var(--text-display);
  transform: translateY(-2px);
}
.footer__cta:hover svg {
  transform: translate(2px, -2px);
}
.footer__cta svg {
  transition: transform var(--duration-normal) var(--ease);
}

/* --- REVEAL ANIMATIONS --- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children */
.reveal:nth-child(2) { transition-delay: 0.08s; }
.reveal:nth-child(3) { transition-delay: 0.16s; }
.reveal:nth-child(4) { transition-delay: 0.24s; }
.reveal:nth-child(5) { transition-delay: 0.32s; }
.reveal:nth-child(6) { transition-delay: 0.40s; }
.reveal:nth-child(7) { transition-delay: 0.48s; }
.reveal:nth-child(8) { transition-delay: 0.56s; }
.reveal:nth-child(9) { transition-delay: 0.64s; }

/* Hero specific stagger */
.hero .reveal:nth-child(1) { animation: fadeInUp 0.8s var(--ease) 0.2s both; }
.hero .reveal:nth-child(2) { animation: fadeInUp 0.8s var(--ease) 0.4s both; }
.hero .reveal:nth-child(3) { animation: fadeInUp 0.8s var(--ease) 0.6s both; }
.hero .reveal:nth-child(4) { animation: fadeInUp 0.8s var(--ease) 0.8s both; }

/* Timeline stagger */
.timeline .timeline__item.reveal:nth-child(2) { transition-delay: 0.05s; }
.timeline .timeline__item.reveal:nth-child(3) { transition-delay: 0.10s; }
.timeline .timeline__item.reveal:nth-child(4) { transition-delay: 0.15s; }
.timeline .timeline__item.reveal:nth-child(5) { transition-delay: 0.20s; }
.timeline .timeline__item.reveal:nth-child(6) { transition-delay: 0.25s; }
.timeline .timeline__item.reveal:nth-child(7) { transition-delay: 0.30s; }
.timeline .timeline__item.reveal:nth-child(8) { transition-delay: 0.35s; }
.timeline .timeline__item.reveal:nth-child(9) { transition-delay: 0.40s; }
.timeline .timeline__item.reveal:nth-child(10) { transition-delay: 0.45s; }

/* Tag hover stagger */
.craft__tags .tag { transition-delay: calc(var(--tag-index, 0) * 30ms); }

/* --- SCROLLBAR --- */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--black); }
::-webkit-scrollbar-thumb { background: var(--border-visible); border-radius: 2px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-disabled); }

/* --- SELECTION --- */
::selection { background: var(--accent); color: #fff; }