:root {
  --bg: #f5f7fa;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --primary: #1976d2;
  --primary-dark: #1259a8;
  --error: #b91c1c;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 2px 8px rgba(0,0,0,0.04);
}

* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--bg); color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px; line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Topbar */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 24px;
  background: white;
  border-bottom: 1px solid var(--border);
}
.topnav { display: flex; gap: 8px; align-items: center; }
.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}

/* Buttons */
.btn-primary, .btn-ghost, .btn-link, .btn-icon {
  display: inline-block;
  font-weight: 600;
  border-radius: 8px;
  text-decoration: none;
  cursor: pointer;
  border: none;
  font-size: 1rem;
  text-align: center;
  transition: background 0.1s, opacity 0.1s;
}
.btn-primary {
  background: var(--primary);
  color: white;
  padding: 14px 28px;
}
.btn-primary:hover:not(:disabled) { background: var(--primary-dark); }
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; }
.btn-ghost {
  background: transparent;
  color: var(--primary);
  padding: 8px 16px;
  border: 1px solid var(--primary);
}
.btn-ghost:hover { background: var(--bg); }
.btn-link {
  color: var(--primary);
  padding: 8px 16px;
  background: transparent;
  font-size: 0.95rem;
}
.btn-link:hover { text-decoration: underline; }
.btn-icon {
  background: white;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 16px;
  font-size: 0.9rem;
}
.btn-icon:hover { background: var(--bg); }

/* Hero */
.hero {
  max-width: 720px;
  margin: 0 auto;
  padding: 60px 24px;
  text-align: center;
}
.hero h1 {
  font-size: 2.5rem;
  line-height: 1.15;
  margin: 0 0 20px;
  letter-spacing: -0.02em;
}
.lead {
  font-size: 1.15rem;
  color: var(--muted);
  margin: 0 auto 32px;
  max-width: 540px;
}
.features {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 0 auto 32px;
  max-width: 460px;
  text-align: left;
  font-size: 1.05rem;
}
.cta {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
}
.cta .btn-primary { min-width: 260px; }

/* Footer */
.footer {
  text-align: center;
  padding: 24px;
  color: var(--muted);
  font-size: 0.9rem;
}

/* Auth pages (register, success) */
.auth {
  max-width: 480px;
  margin: 0 auto;
  padding: 40px 24px;
}
.auth h1 {
  text-align: center;
  margin: 0 0 12px;
  font-size: 1.8rem;
}
.auth .lead {
  font-size: 1rem;
  margin-bottom: 24px;
}
.auth form {
  background: var(--card);
  padding: 24px;
  border-radius: 12px;
  box-shadow: var(--shadow);
}
.auth form label {
  display: block;
  margin-bottom: 14px;
  font-size: 0.9rem;
  color: var(--muted);
}
.auth input[type="text"],
.auth input[type="tel"],
.auth input[type="email"],
.auth input[type="password"] {
  display: block;
  width: 100%;
  padding: 12px;
  font-size: 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: white;
  color: var(--text);
  margin-top: 4px;
}
.auth input:focus { outline: 2px solid var(--primary); outline-offset: -1px; border-color: var(--primary); }
.auth .btn-primary { width: 100%; padding: 14px; margin-top: 8px; }

.error { color: var(--error); margin-top: 8px; font-size: 0.9rem; min-height: 1.2em; }
.muted { color: var(--muted); }
.small { font-size: 0.85rem; }
.terms { text-align: center; margin-top: 16px; }

/* Success page */
.done-card {
  background: var(--card);
  padding: 32px 24px;
  border-radius: 12px;
  box-shadow: var(--shadow);
  text-align: center;
}
.done-icon { font-size: 3rem; margin-bottom: 8px; }
.url-block {
  margin: 20px 0;
  text-align: left;
}
.url-block label {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 6px;
}
.url-row {
  display: flex;
  gap: 8px;
}
.url-row input {
  flex: 1;
  padding: 10px;
  font-size: 0.85rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: white;
  font-family: monospace;
  color: var(--text);
}
.url-row .btn-primary,
.url-row .btn-icon {
  padding: 10px 16px;
  margin-top: 0;
  flex-shrink: 0;
  width: auto;
}
.qr-block {
  margin: 24px 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.qr-block img {
  max-width: 240px;
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: white;
}
.next-steps {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  text-align: left;
}
.next-steps h3 { margin: 0 0 12px; font-size: 1rem; }
.next-steps ol {
  padding-left: 20px;
  color: var(--muted);
  font-size: 0.9rem;
}
.next-steps li { margin-bottom: 6px; }

/* 404 */
.notfound {
  text-align: center;
  padding: 80px 24px;
}
.notfound h1 {
  font-size: 4rem;
  margin: 0 0 12px;
  color: var(--primary);
  letter-spacing: -0.04em;
}

@media (max-width: 600px) {
  .hero { padding: 40px 16px; }
  .hero h1 { font-size: 1.9rem; }
  .lead { font-size: 1rem; }
  .features { font-size: 0.95rem; }
}