:root {
  --bg: #0A0A0A;
  --text-primary: #FFFFFF;
  --text-secondary: #A1A1AA;
  --accent: #00FF85;
  --card: #27272A;
  --border: #3F3F46;
  --error: #F87171;
}

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

html, body {
  height: 100%;
}

body {
  background-color: var(--bg);
  color: var(--text-primary);
  font-family: Calibri, system-ui, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Header ── */
header {
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.logo-monogram {
  font-family: "Arial Black", Arial, system-ui, sans-serif;
  font-weight: 900;
  font-size: 28px;
  color: var(--accent);
  line-height: 1;
}

.logo-wordmark {
  font-family: Arial, system-ui, sans-serif;
  font-weight: 700;
  font-size: 11px;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--text-secondary);
  line-height: 1;
}

/* ── Main / Hero ── */
main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px 24px;
}

.hero {
  max-width: 680px;
  width: 100%;
  text-align: center;
}

.headline {
  font-family: "Arial Black", Arial, system-ui, sans-serif;
  font-weight: 900;
  font-size: 40px;
  line-height: 1.1;
  margin-bottom: 20px;
}

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

.subhead {
  font-family: Calibri, system-ui, sans-serif;
  font-size: 18px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 32px;
}

.cta-label {
  font-size: 14px;
  color: var(--text-primary);
  margin-bottom: 14px;
}

/* ── Form ── */
.signup-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
}

.signup-form input[type="email"] {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-family: Calibri, system-ui, sans-serif;
  font-size: 15px;
  padding: 14px 16px;
  border-radius: 4px;
  outline: none;
  width: 100%;
  transition: border-color 0.15s ease;
}

.signup-form input[type="email"]::placeholder {
  color: var(--text-secondary);
}

.signup-form input[type="email"]:focus {
  border-color: var(--accent);
}

.signup-form button[type="submit"] {
  background: var(--accent);
  color: #000000;
  font-family: Arial, system-ui, sans-serif;
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 14px 28px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  white-space: nowrap;
  transition: opacity 0.15s ease;
}

.signup-form button[type="submit"]:hover {
  opacity: 0.88;
}

.signup-form button[type="submit"]:active {
  opacity: 0.75;
}

/* ── Footer ── */
footer {
  flex-shrink: 0;
  padding: 0 24px 20px;
}

.footer-copy {
  font-size: 10px;
  color: var(--text-secondary);
  text-align: center;
}

/* ── Desktop ── */
@media (min-width: 640px) {
  .headline {
    font-size: 64px;
  }

  .signup-form {
    flex-direction: row;
    align-items: stretch;
  }

  .signup-form input[type="email"] {
    flex: 1;
  }

  .signup-form button[type="submit"] {
    flex-shrink: 0;
  }
}