:root {
  --color-bg: #ffffff;
  --color-text: #111827;
  --color-muted: #6b7280;
  --color-border: #e5e7eb;
  --color-primary: #1d4ed8;
  --color-primary-dark: #1e40af;
  --color-success: #16a34a;
  --color-success-bg: #ecfdf5;
  --radius: 10px;
  --shadow: 0 4px 20px rgba(17, 24, 39, 0.08);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
}

a { color: var(--color-primary); text-decoration: none; }

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
}

.logo {
  font-weight: 700;
  font-size: 20px;
  color: var(--color-text);
}
.logo span { color: var(--color-primary); }

.nav-links a {
  margin-left: 24px;
  color: var(--color-text);
  font-weight: 500;
}

.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 15px;
  border: none;
  cursor: pointer;
  text-align: center;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover { background: var(--color-primary-dark); }

.btn-ghost {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.btn-block { width: 100%; }

/* Hero */
.hero {
  padding: 72px 0 56px;
  text-align: center;
}

.badge-free {
  display: inline-block;
  background: var(--color-success-bg);
  color: var(--color-success);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.02em;
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 20px;
  text-transform: uppercase;
}

.hero h1 {
  font-size: 42px;
  margin: 0 0 16px;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.hero p.subtitle {
  color: var(--color-muted);
  font-size: 18px;
  max-width: 620px;
  margin: 0 auto 32px;
}

.hero .no-cc {
  margin-top: 14px;
  font-size: 14px;
  color: var(--color-success);
  font-weight: 600;
}

/* Feature grid */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  padding: 24px 0 72px;
}

.feature-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
}

.feature-card h3 {
  margin-top: 0;
  font-size: 18px;
}

.feature-card p {
  color: var(--color-muted);
  font-size: 15px;
  margin-bottom: 0;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 32px 0;
  color: var(--color-muted);
  font-size: 14px;
  text-align: center;
}

.site-footer a { color: var(--color-primary); font-weight: 600; }

/* Modal */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(17, 24, 39, 0.5);
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 50;
}
.modal-overlay.open { display: flex; }

.modal {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  width: 100%;
  max-width: 440px;
  padding: 28px;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
}

.modal h2 { margin-top: 0; }

.modal-close {
  position: absolute;
  top: 16px;
  right: 18px;
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  color: var(--color-muted);
}

.form-group { margin-bottom: 14px; }
.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 6px;
}
.form-group input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 15px;
}
.form-group input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.captcha-row {
  display: flex;
  align-items: center;
  gap: 10px;
}
.captcha-question {
  background: #f3f4f6;
  padding: 10px 14px;
  border-radius: 8px;
  font-weight: 600;
  white-space: nowrap;
}

.form-hint {
  font-size: 12px;
  color: var(--color-muted);
  margin-top: 4px;
}

.form-error {
  background: #fef2f2;
  color: #b91c1c;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 14px;
  margin-bottom: 14px;
  display: none;
}
.form-error.show { display: block; }

.form-success {
  background: var(--color-success-bg);
  color: var(--color-success);
  padding: 14px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  text-align: center;
}

/* Auth pages */
.auth-page {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
}

.auth-card {
  width: 100%;
  max-width: 400px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
}

.auth-card h1 { font-size: 24px; margin-top: 0; }

.dashboard-page {
  max-width: 640px;
  margin: 80px auto;
  padding: 0 20px;
  text-align: center;
}

.verify-page {
  max-width: 480px;
  margin: 100px auto;
  padding: 0 20px;
  text-align: center;
}

@media (max-width: 720px) {
  .features { grid-template-columns: 1fr; }
  .hero h1 { font-size: 30px; }
}