:root {
  color-scheme: light;
  --bg: #f5f5f7;
  --surface: rgba(255, 255, 255, 0.72);
  --surface-alt: rgba(0, 0, 0, 0.05);
  --surface-opaque: #ffffff;
  --ink: #1d1d1f;
  --muted: #86868b;
  --line: rgba(0, 0, 0, 0.08);
  --glass-border: rgba(255, 255, 255, 0.8);
  --shadow: 0 20px 40px rgba(0, 0, 0, 0.06);
  --shadow-soft: 0 8px 24px rgba(0, 0, 0, 0.03);
  --radius: 28px;
  --radius-soft: 18px;
  --max-width: 1100px;
  --accent: #000000;
  --accent-blue: #0066cc;
}

[data-theme='dark'] {
  color-scheme: dark;
  --bg: #000000;
  --surface: rgba(28, 28, 30, 0.6);
  --surface-alt: rgba(255, 255, 255, 0.08);
  --surface-opaque: #1c1c1e;
  --ink: #f5f5f7;
  --muted: #a1a1a6;
  --line: rgba(255, 255, 255, 0.1);
  --glass-border: rgba(255, 255, 255, 0.1);
  --shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
  --shadow-soft: 0 8px 24px rgba(0, 0, 0, 0.3);
  --accent: #ffffff;
  --accent-blue: #0a84ff;
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
  text-decoration: none !important;
}

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
  position: relative;
  touch-action: pan-y; /* Disable double-tap zoom and horizontal gestures */
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Icons", "Helvetica Neue", Helvetica, Arial, sans-serif;
  background-color: var(--bg);
  color: var(--ink);
  line-height: 1.5;
  letter-spacing: -0.022em;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* Background Glass Orbs */
body::before, body::after {
  content: "";
  position: fixed;
  width: 60vw;
  height: 60vw;
  border-radius: 50%;
  filter: blur(100px);
  z-index: -1;
  opacity: 0.12;
  pointer-events: none;
  animation: orbFloat 20s infinite alternate ease-in-out;
}

body::before { background: radial-gradient(circle, #0066cc, #5ac8fa); top: -15vw; left: -15vw; }
body::after { background: radial-gradient(circle, #ff2d55, #ff375f); bottom: -15vw; right: -15vw; animation-delay: -10s; }

@keyframes orbFloat {
  from { transform: translate(0, 0) scale(1); }
  to { transform: translate(5vw, 5vw) scale(1.1); }
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  background: rgba(251, 251, 253, 0.72);
  border-bottom: 1px solid var(--line);
}

.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  height: 64px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink);
  z-index: 1100;
}

.nav-links {
  display: flex;
  gap: 24px;
  font-size: 0.85rem;
  font-weight: 500;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.nav-links a { color: var(--ink); opacity: 0.7; transition: all 0.2s ease; }
.nav-links a:hover, .nav-links a.active { opacity: 1; color: var(--accent-blue); }

.desktop-only { display: inline-flex !important; }
.mobile-only { display: none !important; }

.burger-menu {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 1100;
  padding: 0;
}

.burger-menu span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--ink);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.burger-menu.active span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.burger-menu.active span:nth-child(2) { opacity: 0; }
.burger-menu.active span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { transform: scale(1.04); background: #333; }
.btn-secondary {
  background: var(--surface);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  color: var(--ink);
}
.btn-secondary:hover { background: rgba(255, 255, 255, 0.9); transform: scale(1.04); }
.btn-large { padding: 16px 32px; font-size: 1rem; }

/* Layout Utilities */
.container { width: min(100% - 48px, var(--max-width)); margin: 0 auto; }
.text-center { text-align: center; }
.text-left { text-align: left; }
.mx-auto { margin-left: auto; margin-right: auto; }
.justify-center { justify-content: center; }

h1 { font-size: clamp(2.5rem, 8vw, 4.5rem); line-height: 1.05; letter-spacing: -0.03em; font-weight: 800; margin: 0 0 24px; }
h2 { font-size: clamp(1.8rem, 5vw, 2.8rem); line-height: 1.1; letter-spacing: -0.02em; font-weight: 700; margin: 0 0 16px; }
h3 { font-size: clamp(1.2rem, 3vw, 1.5rem); font-weight: 600; letter-spacing: -0.01em; margin: 0 0 12px; }
.lead { font-size: clamp(1.1rem, 3vw, 1.4rem); line-height: 1.45; color: var(--muted); max-width: 740px; margin-bottom: 48px; }
.eyebrow { text-transform: uppercase; letter-spacing: 0.15em; font-size: 0.7rem; font-weight: 700; color: var(--accent-blue); margin-bottom: 16px; }

.hero { padding: 160px 0 100px; animation: fadeUp 0.8s cubic-bezier(0.16, 1, 0.3, 1); }
@keyframes fadeUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }

.hero-centered { width: 100%; max-width: 840px; display: flex; flex-direction: column; align-items: center; }

.section { padding: clamp(80px, 12vw, 140px) 0; }
.section-head { margin-bottom: 64px; }

/* Glass Panels */
.feature-card, .timeline-card, .job-card, .lab-panel, .lab-sidebar, .modal-card, .community-cta, .glass-content {
  backdrop-filter: saturate(180%) blur(24px);
  -webkit-backdrop-filter: saturate(180%) blur(24px);
  background: var(--surface);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-soft);
  border-radius: var(--radius);
  padding: 40px;
  transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.feature-card:hover, .timeline-card:hover, .job-card:hover, .community-cta:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow: var(--shadow);
}

[data-theme='light'] .feature-card:hover, 
[data-theme='light'] .timeline-card:hover, 
[data-theme='light'] .job-card:hover, 
[data-theme='light'] .community-cta:hover {
  background: rgba(255, 255, 255, 0.85);
}

[data-theme='dark'] .feature-card:hover, 
[data-theme='dark'] .timeline-card:hover, 
[data-theme='dark'] .job-card:hover, 
[data-theme='dark'] .community-cta:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.2);
}

.feature-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.cta-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 32px; }
.text-link { color: var(--accent-blue); font-weight: 600; margin-top: 24px; display: inline-block; font-size: 0.95rem; }

/* Timeline */
.timeline { display: grid; gap: 32px; }
.timeline-index { font-size: 0.8rem; font-weight: 800; color: var(--muted); margin-bottom: 8px; }
.bullet-list { list-style: none; padding: 0; margin: 24px 0 0; }
.bullet-list li { margin-bottom: 12px; padding-left: 20px; position: relative; font-size: 1rem; }
.bullet-list li::before { content: "•"; position: absolute; left: 0; color: var(--accent-blue); }

/* Lab & Editor */
.lab-layout { display: grid; grid-template-columns: 300px 1fr; gap: 48px; }
.lab-grid { display: grid; grid-template-columns: 1fr; gap: 64px; }
.sidebar-group { font-size: 0.65rem; font-weight: 800; text-transform: uppercase; color: var(--muted); margin: 24px 0 8px 12px; letter-spacing: 0.1em; }
.problem-link { padding: 12px 16px; border-radius: 14px; text-align: left; background: transparent; border: none; cursor: pointer; font-size: 0.9rem; font-weight: 500; color: var(--ink); opacity: 0.6; }
.problem-link:hover, .problem-link.active { opacity: 1; background: var(--surface-alt); }
.problem-link.active { background: var(--accent-blue); color: #fff; }

.lab-meta { display: flex; gap: 32px; margin-top: 24px; }
.meta-label { font-size: 0.65rem; text-transform: uppercase; color: var(--muted); font-weight: 700; display: block; margin-bottom: 4px; }
.meta-value { font-weight: 600; font-size: 0.95rem; }
.hint-card { margin-top: 32px; padding: 20px; background: rgba(0,0,0,0.03); border-radius: 16px; font-size: 0.95rem; line-height: 1.5; }

.editor-panel { display: flex; flex-direction: column; min-height: 600px; background: #1e1e1e; border-radius: var(--radius); overflow: hidden; border: 1px solid rgba(255,255,255,0.1); }
.editor-header { padding: 12px 20px; display: flex; justify-content: space-between; align-items: center; background: rgba(255,255,255,0.05); border-bottom: 1px solid rgba(255,255,255,0.1); }
.tab { padding: 8px 16px; border-radius: 8px; font-size: 0.85rem; color: #aaa; cursor: pointer; }
.tab.active { background: rgba(255,255,255,0.1); color: #fff; }
#monaco-editor-container { flex-grow: 1; height: 450px; }
.console { background: rgba(0,0,0,0.3); padding: 20px; border-top: 1px solid rgba(255,255,255,0.1); font-family: 'SF Mono', Menlo, monospace; font-size: 0.85rem; color: #ddd; max-height: 250px; overflow-y: auto; }

/* Jobs Page */
.jobs-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 48px; gap: 24px; flex-wrap: wrap; }
.search-bar input { padding: 14px 24px; border-radius: 16px; border: 1px solid var(--line); background: var(--surface); width: 100%; max-width: 380px; outline: none; font-size: 1rem; }
.jobs-grid { display: flex; flex-direction: column; gap: 32px; }
.job-card { display: flex; justify-content: space-between; align-items: center; gap: 48px; padding: 40px; }
.job-info { flex: 1; }
.job-info h3 { font-size: 1.4rem; margin-bottom: 8px; }
.job-desc { margin-top: 16px; line-height: 1.6; }
.job-meta-list { display: flex; align-items: center; gap: 20px; }
.pill { padding: 6px 14px; border-radius: 999px; font-size: 0.75rem; font-weight: 700; background: var(--surface-alt); color: var(--ink); text-transform: uppercase; }

/* Modal System */
.modal-overlay { position: fixed; inset: 0; background: rgba(0, 0, 0, 0.3); backdrop-filter: blur(12px); display: none; align-items: center; justify-content: center; z-index: 2000; padding: 24px; }
.modal-overlay.active { display: flex; }
.modal-card { width: 100%; max-width: 540px; max-height: 90vh; overflow-y: auto; background: var(--surface-opaque); padding: 40px; box-shadow: 0 30px 60px rgba(0,0,0,0.15); border-radius: 24px; }
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 32px; }
.close-btn { background: none; border: none; font-size: 1.5rem; cursor: pointer; color: var(--muted); padding: 0; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 24px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 0.75rem; font-weight: 700; color: var(--muted); margin-bottom: 8px; text-transform: uppercase; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 14px 18px; border-radius: 14px; border: 1px solid var(--line); background: rgba(0,0,0,0.02); font-size: 1rem; outline: none; }

/* Community Page */
.community-page { display: grid; grid-template-columns: 1.25fr 0.75fr; gap: 48px; }

/* Footer */
.site-footer { padding: 80px 0; border-top: 1px solid var(--line); margin-top: 80px; position: relative; z-index: 1; }
.footer-grid { display: flex; justify-content: space-between; align-items: center; }
.muted { color: var(--muted); font-size: 0.9rem; }

@media (max-width: 1024px) {
  .lab-layout, .community-page { grid-template-columns: 1fr; gap: 32px; }
  .lab-sidebar { position: static; order: 2; }
}

@media (max-width: 768px) {
  .nav-bar { justify-content: space-between; }
  .logo { flex: 0; order: 1; }
  .burger-menu { display: flex !important; order: 2; }
  
  .nav-links { 
    position: fixed; top: 0; right: -100%; width: 100%; height: 100vh; 
    background: rgba(251, 251, 253, 0.98); backdrop-filter: blur(30px);
    flex-direction: column; align-items: center; justify-content: center; gap: 32px; padding: 40px; 
    transition: all 0.5s ease; z-index: 1050; opacity: 0; transform: none; left: auto;
  }
  .nav-links.active { right: 0; opacity: 1; }
  .nav-links a { font-size: 1.6rem; font-weight: 700; }
  
  .desktop-only { display: none !important; }
  .mobile-only { display: inline-flex !important; }
  
  .hero { padding: 100px 0 60px; }
  .feature-card, .timeline-card, .job-card, .lab-panel, .community-cta { padding: 32px 24px; }
  .job-card { flex-direction: column; align-items: flex-start; gap: 24px; }
  .job-meta-list { width: 100%; justify-content: space-between; }
  .form-grid { grid-template-columns: 1fr; }
  .jobs-header { flex-direction: column; align-items: stretch; }
  .feature-grid { grid-template-columns: 1fr; }
  .footer-grid { flex-direction: column; text-align: center; gap: 24px; }
  .modal-card { padding: 32px 24px; }
}