:root {
  --slide-transition: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  --primary-blue: #0078d4;
  --accent-hover: #106ebe;
}

/* Light Theme (Default) */
body {
  --bg-primary: #ffffff;
  --card-bg: #ffffff;
  --card-secondary: #f5f5f5;
  --text-primary: #000000;
  --text-secondary: #616161;
  --border-color: #e0e0e0;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.15);
}

/* Dark Theme */
body[data-theme="dark"] {
  --bg-primary: #1e1e1e;
  --card-bg: #2d2d30;
  --card-secondary: #252526;
  --text-primary: #e0e0e0;
  --text-secondary: #a0a0a0;
  --border-color: #3e3e42;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.6);
}

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

html, body { 
  height: 100%; 
  min-height: 100vh;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--bg-primary);
  min-height: 100vh;
  color: var(--text-primary);
  position: relative;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  transition: background-color 0.3s, color 0.3s;
}

a { color: inherit; text-decoration: none; }
a:hover { opacity: 0.92; }

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 16px;
}

.top {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(10px);
  background: transparent;
  padding: 14px 0;
  transition: padding 0.25s ease;
}

.top.scrolled {
  padding: 8px 0;
}

.top .container {
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-pill {
  width: min(1040px, 100%);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.70);
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.10);
  transition: padding 0.25s ease, gap 0.25s ease;
}

.top.scrolled .nav-pill {
  padding: 7px 12px;
  gap: 10px;
}

html[data-theme="dark"] .nav-pill {
  background: rgba(17, 24, 39, 0.66);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.28);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 750;
  letter-spacing: 0.1px;
}

.brand-dot {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, rgba(22, 119, 255, 0.9), rgba(37, 99, 235, 0.45));
  box-shadow: 0 10px 25px rgba(22, 119, 255, 0.25);
  transition: width 0.25s ease, height 0.25s ease;
}

.top.scrolled .brand-dot {
  width: 24px;
  height: 24px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 14px;
  transition: gap 0.25s ease;
}

.top.scrolled .nav {
  gap: 10px;
}

.nav a {
  color: var(--muted);
  font-size: 14px;
  transition: font-size 0.25s ease;
}

.top.scrolled .nav a {
  font-size: 13px;
}

.nav a:hover { color: var(--text); opacity: 1; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 14pxvar(--border);
  background: var(--card-bg);
  color: var(--text);
  font-weight: 600;
  font-size: 14px;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  user-select: none;
}

.top.scrolled .btn {
  padding: 8px 12px;
  font-size: 13px;
}

.icon-btn {
  width: 42px;
  height: 42px;
  padding: 0 !important;
  border-radius: 999px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  font-size: 1.3rem;
}

.top.scrolled .icon-btn {
  width: 38px;
  height: 38px;
}

.btn:hover {
  transform: scale(1.05);
  border-color: var(--accent);
  box-shadow: var(--shadow-hover);
}

.icon-btn:hover {
  transform: scale(1.1
  border-color: rgba(15, 23, 42, 0.18);
  background: rgba(255, 255, 255, 0.92);
}

.btn.ghost {
  border-color: rgba(15, 23, 42, 0.12);
  background: transparent;
  box-shadow: none;
}

.btn.ghost:hover {
  background: rgba(255, 255, 255, 0.65);
}

.btn.primary {
  border-color: rgba(22, 119, 255, 0.35);
  background: rgba(22, 119, 255, 0.12);
}

.btn.primary:hover {
  border-color: rgba(22, 119, 255, 0.50);
  background: rgba(22, 119, 255, 0.16);
}

.hero {
  padding: 70px 0 40px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 22px;
  align-items: start;
}

.hero-center {
  text-align: center;
  max-width: 880px;
  margin: 0 auto;
}

.hero-logo {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  margin: 0 auto 16px;
  background: radial-gradient(circle at 35% 35%, rgba(22, 119, 255, 0.95), rgba(37, 99, 235, 0.45));
  box-shadow: 0 18px 40px rgba(22, 119, 255, 0.22);
  border: 1px solid rgba(15, 23, 42, 0.08);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid rgba(15, 23, 42, 0.10);
  background: rgba(255, 255, 255, 0.75);
  border-radius: 999px;
  padding: 6px 10px;
  color: var(--muted);
  font-size: 13px;
}

h1 {
  margin: 14px 0 10px;
  font-size: clamp(34px, 4vw, 52px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 600;
  color: var(--text);
}

h2 {
  margin: 0 0 8px;
  font-size: 28px;
  letter-spacing: -0.01em;
  font-weight: 600;
  color: var(--text);
}

h3 {
  margin: 0 0 6px;
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
}

.muted { color: var(--muted); font-weight: 650; }

.accent { color: var(--accent); }

.lead {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
  max-width: 66ch;
  margin-left: auto;
  margin-right: auto;
}

.cta-row {
  display: flex;
  gap: 12px;
  margin-top: 18px;
  flex-wrap: wrap;
  justify-content: center;
}

.waitlist {
  margin: 26px auto 0;
  max-width: 680px;
}

.waitlist .card-title {
  font-size: 22px;
  margin-bottom: 6px;
}

.waitlist .sub {
  margin: 0 0 14px;
}

.waitlist-row {
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
}

.input {
  width: min(420px, 100%);
  height: 44px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(15, 23, 42, 0.12);
  background: rgba(255, 255, 255, 0.85);
  padding: 0 14px;
  outline: none;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.08);
}

.input:focus {
  border-color: rgba(22, 119, 255, 0.35);
  box-shadow: 0 10px 24px rgba(22, 119, 255, 0.14);
}

.hero-card .card {
  border: 1px solid rgba(15, 23, 42, 0.10);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow);
  padding: 14px;
}

.card-title {
  font-weight: 700;
  margin-bottom: 8px;
}

.bullets {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}

.section {
  padding: 44px 0;
}

.section h2 {
  margin: 0 0 8px;
  font-size: 28px;
  letter-spacing: -0.3px;
}

.sub {
  margin: 0 0 16px;
  color: var(--muted);
}

.grid {var(--border);
  border-radius: var(--radius);
  background: var(--card-bg);
  padding: 24px;
  box-shadow: var(--shadow);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
}

.tile:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: var(--shadow-hover

.tile {
  border: 1px solid rgba(15, 23, 42, 0.10);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.72);
  padding: 16px;
  box-shadow: var(--shadow-soft);
}

.tile h3 {
  margin: 0 0 6px;
  font-size: 18px;
}

.tile p {
  margin: 0;
  color: var(--muted);
}

.link {
  display: inline-block;
  margin-top: 10px;
  color: var(--accent);
  font-weight: 600;
  font-size: 14px;
}

.quote {
  border: 1px solid rgba(15, 23, 42, 0.10);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.72);
  padding: 16px;
  box-shadow: var(--shadow-soft);
}

.quote p {
  margin: 0;
  color: var(--text);
}

.who {
  margin-top: 10px;
  color: var(--muted-2);
  font-size: 14px;
}

.faq {
  border: 1px solid rgba(15, 23, 42, 0.10);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.72);
  padding: 10px 14px;
  box-shadow: var(--shadow-soft);
}

details {
  padding: 10px 0;
  border-bottom: 1px solid rgba(15, 23, 42, 0.08);
}

details:last-child { border-bottom: 0; }

summary {
  cursor: pointer;
  font-weight: 650;
}

details p { color: var(--muted); margin: 10px 0 0; }

.contact {
  border: 1px solid rgba(15, 23, 42, 0.10);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.72);
  padding: 16px;
  box-shadow: var(--shadow-soft);
}

.fine {
  margin-top: 14px;
  color: var(--muted-2);
  font-size: 13px;
}

.footer {
  border-top: 1px solid rgba(15, 23, 42, 0.10);
  padding: 22px 0;
  color: var(--muted-2);
}

.footer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.footer-links {
  display: flex;
  gap: 12px;
}

/* Card Grid Layout */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
  gap: 30px;
  margin: 40px 0;
}

/* Content Cards */
.content-card {
  background: var(--card-bg);
  border-radius: 8px;
  padding: 32px;
  border: 1px solid var(--border);
  text-align: left;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow);
}

.content-card:hover {
  border-color: var(--brand);
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.card-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
  display: block;
  text-align: center;
}

.card-title {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--text);
  text-align: center;
  letter-spacing: 0;
}

.card-section {
  margin-bottom: 20px;
}

.card-section:last-child {
  margin-bottom: 0;
}

.section-label {
  font-size: 0.75rem;
  color: var(--brand);
  margin-bottom: 8px;
  margin-top: 0;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.section-text {
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--muted);
  margin-top: 0;
  margin-bottom: 0;
}

.analogy-box {
  padding: 16px;
  background: var(--card-secondary);
  border-radius: 6px;
  border-left: 3px solid var(--brand);
}

.analogy-box .section-text {
  font-style: italic;
  color: var(--text-secondary);
}

@media (max-width: 860px) {
  .hero { padding: 56px 0 26px; }
  .hero-grid { grid-template-columns: 1fr; }
  .grid { grid-template-columns: 1fr; }
  .cards-grid { grid-template-columns: 1fr; }
  .nav { gap: 10px; }
  .nav a { font-size: 13px; }
  .nav-pill { padding: 10px 12px; }
}