/* ===== TOKENS ===== */
:root {
  --bg: #fafafa;
  --bg-page: #ffffff;
  --bg-elevated: #ffffff;
  --bg-subtle: #f4f5f6;
  --text: #1a1a1a;
  --text-secondary: #4a4a4a;
  --text-tertiary: #8a8a8a;
  --border: #e8e8e8;
  --border-subtle: #f0f0f0;
  --accent: #0055dd;
  --accent-soft: rgba(0, 85, 221, 0.06);
  --accent-hover: #0044b3;
  --surface: #ffffff;
  --nav-bg: rgba(250, 250, 250, 0.92);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.05);
  --shadow-lg: 0 12px 48px rgba(0,0,0,0.07);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-xs: 4px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: 'Newsreader', Georgia, serif;
  --font-mono: 'JetBrains Mono', monospace;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1080px;
  --max-width-narrow: 720px;
}

[data-theme="dark"] {
  --bg: #0c0c0c;
  --bg-page: #111111;
  --bg-elevated: #1a1a1a;
  --bg-subtle: #161616;
  --text: #eeeeee;
  --text-secondary: #a8a8a8;
  --text-tertiary: #666666;
  --border: #252525;
  --border-subtle: #1e1e1e;
  --accent: #4d9fff;
  --accent-soft: rgba(77, 159, 255, 0.08);
  --accent-hover: #6db3ff;
  --surface: #161616;
  --nav-bg: rgba(12, 12, 12, 0.92);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 48px rgba(0,0,0,0.5);
}

/* ===== RESET ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* ===== LAYOUT ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}
.container-narrow {
  max-width: var(--max-width-narrow);
  margin: 0 auto;
  padding: 0 32px;
}

/* ===== NAVIGATION ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
}
.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 16px;
  letter-spacing: -0.02em;
}
.nav-logo-mark { color: var(--accent); }
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-link {
  font-size: 13px;
  font-weight: 450;
  color: var(--text-secondary);
  transition: color var(--transition);
  letter-spacing: 0.01em;
}
.nav-link:hover { color: var(--text); }
.nav-link.active { color: var(--accent); }
.theme-toggle {
  color: var(--text-tertiary);
  padding: 8px;
  border-radius: 6px;
  transition: color var(--transition), background var(--transition);
}
.theme-toggle:hover { color: var(--text); background: var(--bg-subtle); }

/* ===== HERO ===== */
.hero {
  padding: 160px 0 80px;
}
.hero-content {
  max-width: 680px;
}
.hero-overline {
  font-size: 13px;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 24px;
}
.hero-title {
  font-family: var(--font);
  font-size: clamp(40px, 5.5vw, 64px);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 24px;
}
.hero-subtitle {
  font-size: 18px;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 540px;
}

/* ===== EXPLORE SECTION (HOME) ===== */
.explore {
  padding: 40px 0 80px;
}
.explore-prompt {
  font-size: 14px;
  color: var(--text-tertiary);
  margin-bottom: 24px;
  font-weight: 450;
}
.explore-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.explore-card {
  display: flex;
  align-items: center;
  padding: 32px 36px;
  background: var(--bg-page);
  transition: background var(--transition);
  position: relative;
}
.explore-card:hover {
  background: var(--accent-soft);
}
.explore-question {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 400;
  font-style: italic;
  color: var(--text);
  flex: 1;
}
.explore-destination {
  font-size: 13px;
  font-weight: 500;
  color: var(--accent);
  margin-right: 12px;
}
.explore-arrow {
  color: var(--accent);
  opacity: 0;
  transform: translateX(-8px);
  transition: opacity var(--transition), transform var(--transition);
}
.explore-card:hover .explore-arrow {
  opacity: 1;
  transform: translateX(0);
}

/* ===== HOME STATEMENT ===== */
.home-statement {
  padding: 80px 0;
  border-top: 1px solid var(--border-subtle);
}
.statement-quote {
  max-width: 640px;
}
.statement-quote p {
  font-family: var(--font-serif);
  font-size: 24px;
  line-height: 1.6;
  color: var(--text);
  font-weight: 400;
}
.statement-attribution {
  margin-top: 24px;
  font-size: 14px;
  color: var(--text-tertiary);
  font-weight: 450;
}

/* ===== HOME CURRENT FOCUS ===== */
.home-current {
  padding: 80px 0 120px;
  border-top: 1px solid var(--border-subtle);
}
.home-section-title {
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-tertiary);
  margin-bottom: 40px;
}
.current-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
}
.current-label {
  display: block;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 12px;
}
.current-text {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* ===== PAGE HEADER (shared by inner pages) ===== */
.page-header {
  padding: 140px 0 60px;
  border-bottom: 1px solid var(--border-subtle);
}
.page-header-overline {
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 16px;
}
.page-header-title {
  font-size: clamp(32px, 4.5vw, 48px);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: var(--text);
  max-width: 600px;
}
.page-header-subtitle {
  margin-top: 20px;
  font-size: 17px;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 560px;
}

/* ===== PROSE (for essay/article content) ===== */
.prose {
  padding: 64px 0 120px;
}
.prose h2 {
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-top: 56px;
  margin-bottom: 20px;
  color: var(--text);
}
.prose h3 {
  font-size: 18px;
  font-weight: 600;
  margin-top: 40px;
  margin-bottom: 16px;
  color: var(--text);
}
.prose p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 24px;
}
.prose p:first-child {
  font-size: 18px;
  color: var(--text);
}
.prose blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 24px;
  margin: 32px 0;
  font-family: var(--font-serif);
  font-size: 18px;
  font-style: italic;
  color: var(--text);
  line-height: 1.7;
}
.prose ul, .prose ol {
  margin: 24px 0;
  padding-left: 24px;
}
.prose li {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 8px;
}
.prose a {
  color: var(--accent);
  border-bottom: 1px solid var(--accent-soft);
  transition: border-color var(--transition);
}
.prose a:hover {
  border-color: var(--accent);
}

/* ===== PRINCIPLES ===== */
.principles-list {
  list-style: none;
  padding: 0;
  margin: 48px 0;
}
.principles-list li {
  font-size: 18px;
  line-height: 1.6;
  color: var(--text);
  padding: 20px 0;
  border-bottom: 1px solid var(--border-subtle);
  font-weight: 450;
}
.principles-list li:first-child {
  border-top: 1px solid var(--border-subtle);
}

/* ===== OPEN QUESTIONS ===== */
.questions-list {
  list-style: none;
  padding: 0;
  margin: 48px 0;
}
.questions-list li {
  font-family: var(--font-serif);
  font-size: 20px;
  font-style: italic;
  line-height: 1.5;
  color: var(--text);
  padding: 24px 0;
  border-bottom: 1px solid var(--border-subtle);
}
.questions-list li:first-child {
  border-top: 1px solid var(--border-subtle);
}

/* ===== ESSAYS INDEX ===== */
.essays-list {
  margin: 48px 0;
}
.essay-item {
  display: block;
  padding: 28px 0;
  border-bottom: 1px solid var(--border-subtle);
  transition: padding-left var(--transition);
}
.essay-item:first-child {
  border-top: 1px solid var(--border-subtle);
}
.essay-item:hover {
  padding-left: 8px;
}
.essay-item-title {
  font-size: 18px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 6px;
}
.essay-item-excerpt {
  font-size: 14px;
  color: var(--text-tertiary);
  line-height: 1.6;
}

/* ===== PROJECTS ===== */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 48px 0;
}
.project-card {
  background: var(--bg-page);
  padding: 40px;
  transition: background var(--transition);
}
.project-card:hover {
  background: var(--accent-soft);
}
.project-status {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 4px 10px;
  border-radius: var(--radius-xs);
  background: var(--accent-soft);
  color: var(--accent);
  margin-bottom: 16px;
}
.project-title {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}
.project-description {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 560px;
}

/* ===== TECHNOLOGY ===== */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  margin: 48px 0;
}
.tech-card {
  padding: 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-page);
}
.tech-card-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 10px;
}
.tech-card-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* ===== CONTACT ===== */
.contact-split {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 80px;
  align-items: start;
  padding: 64px 0 120px;
}
.contact-left h2 {
  font-size: 32px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}
.contact-left p {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 380px;
}
.contact-meta {
  margin-top: 48px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.contact-meta-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
}
.contact-meta-value {
  font-size: 15px;
  color: var(--text);
}
.contact-form-card {
  background: var(--bg-page);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px;
  box-shadow: var(--shadow-md);
}
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.form-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-tertiary);
}
.form-input {
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  width: 100%;
}
.form-input::placeholder { color: var(--text-tertiary); font-weight: 300; }
.form-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.form-textarea {
  resize: vertical;
  min-height: 120px;
  line-height: 1.6;
}
.form-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 8px;
}
.btn-submit {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.02em;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: #ffffff;
  transition: all var(--transition);
}
.btn-submit:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0,85,221,0.2);
}
.btn-submit:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.form-status { font-size: 13px; color: var(--text-secondary); }
.form-status.success { color: #10b981; }
.form-status.error { color: #ef4444; }

/* ===== FOOTER ===== */
.footer {
  border-top: 1px solid var(--border);
  padding: 64px 0 40px;
}
.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: start;
  margin-bottom: 48px;
}
.footer-logo {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.02em;
}
.footer-tagline {
  margin-top: 8px;
  font-size: 14px;
  color: var(--text-tertiary);
  font-style: italic;
  font-family: var(--font-serif);
}
.footer-explore-prompt {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-tertiary);
  margin-bottom: 12px;
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer-links a {
  font-size: 14px;
  color: var(--text-secondary);
  transition: color var(--transition);
}
.footer-links a:hover { color: var(--accent); }
.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
}
.footer-copy {
  font-size: 12px;
  color: var(--text-tertiary);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .hero { padding: 120px 0 60px; }
  .current-grid { grid-template-columns: 1fr; gap: 32px; }
  .tech-grid { grid-template-columns: 1fr; }
  .contact-split { grid-template-columns: 1fr; gap: 40px; }
  .form-row { grid-template-columns: 1fr; }
  .footer-top { flex-direction: column; gap: 32px; }
}