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

:root {
  --bg: #0a0a0a;
  --surface: #111111;
  --border: #222222;
  --text: #e8e8e8;
  --text-muted: #888888;
  --accent: #4f8ef7;
  --accent-hover: #3a7ae8;
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
}

.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Nav */
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 40px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 100;
}

.logo {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
}

.nav-cta {
  font-size: 14px;
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}

.nav-cta:hover {
  text-decoration: underline;
}

/* Hero */
.hero {
  padding: 120px 24px 100px;
  text-align: center;
}

.hero-inner {
  max-width: 720px;
  margin: 0 auto;
}

.hero h1 {
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.hero-sub {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

/* Buttons */
.btn-primary {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 12px 28px;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background 0.15s;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

/* For Who */
.for-who {
  padding: 80px 24px;
  border-top: 1px solid var(--border);
  text-align: center;
}

.for-who h2 {
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.for-who p {
  color: var(--text-muted);
  max-width: 580px;
  margin: 0 auto;
  font-size: 17px;
}

/* How */
.how {
  padding: 80px 24px;
  border-top: 1px solid var(--border);
}

.how h2 {
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 48px;
  text-align: center;
}

.steps {
  display: flex;
  flex-direction: column;
  gap: 40px;
  max-width: 620px;
  margin: 0 auto;
}

.step {
  display: flex;
  gap: 24px;
  align-items: flex-start;
}

.step-num {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 2px;
}

.step-text h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 6px;
}

.step-text p {
  color: var(--text-muted);
  font-size: 16px;
}

/* Difference */
.difference {
  padding: 80px 24px;
  border-top: 1px solid var(--border);
}

.difference h2 {
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 48px;
  text-align: center;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  max-width: 860px;
  margin: 0 auto;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 28px 24px;
}

.card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 10px;
}

.card p {
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.65;
}

/* Waitlist */
.waitlist {
  padding: 100px 24px;
  border-top: 1px solid var(--border);
  text-align: center;
}

.waitlist h2 {
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.waitlist > .container > p {
  color: var(--text-muted);
  margin-bottom: 32px;
}

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

.waitlist-form input {
  padding: 12px 16px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: 15px;
  width: 280px;
  outline: none;
  transition: border-color 0.15s;
}

.waitlist-form input:focus {
  border-color: var(--accent);
}

.waitlist-form input::placeholder {
  color: var(--text-muted);
}

.form-confirm {
  margin-top: 16px;
  color: var(--accent);
  font-size: 15px;
  min-height: 22px;
}

/* Footer */
footer {
  padding: 32px 40px;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-muted);
  font-size: 14px;
}