/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--green);
  color: var(--contrast-text-2);
  font-weight: 600;
  padding: 12px 28px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  font-size: 0.95rem;
  font-family: var(--font-body);
  transition: transform .15s, box-shadow .15s, opacity .2s, background .2s, border-color .2s, color .2s;
}
.btn:hover {
  transform: translateY(-1px);
  background: var(--button-hover-bg, var(--green));
  box-shadow: 0 4px 20px var(--button-hover-shadow, rgba(0,229,122,0.25));
}
.btn:active { transform: scale(0.98); }
.btn-sm { padding: 8px 18px; font-size: 0.85rem; }
.btn-lg { padding: 16px 36px; font-size: 1.5rem; }
.btn-full { width: 100%; }
.btn-outline {
  background: transparent;
  color: var(--green);
  border: 1.5px solid var(--green);
}
.btn-outline:hover { background: var(--green-dim); }
.btn-ghost,
#navSignupBtn,
#navLoginBtn,
.site-nav-signup,
.site-nav-login {
  background: var(--contrast-bg);
  color: var(--contrast-text);
  border: 1px solid var(--surface-strong);
}
.btn-primary { background: var(--green); color: var(--contrast-text-2); }
.btn-primary:hover:not(:disabled) { opacity: 0.95; }
.btn-primary:disabled {
  background: var(--surface-soft-3);
  color: var(--text-muted, var(--muted));
  border: 1px solid var(--border);
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}
.arrow { transition: transform .2s; }
.btn:hover .arrow { transform: translateX(4px); }

/* Form primitives */
.auth-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border);
}
.auth-tab {
  flex: 1;
  padding: 10px;
  text-align: center;
  background: none;
  border: none;
  color: var(--text-dim, var(--muted));
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color .2s, border-color .2s;
}
.auth-tab.active { color: var(--text); border-bottom-color: var(--green); }
.form-field { display: flex; flex-direction: column; gap: 6px; }
.form-field label { font-size: 0.85rem; color: var(--text-dim, var(--muted)); font-weight: 500; }
.form-field input,
textarea,
input[type="text"],
input[type="email"],
input[type="password"] {
  width: 100%;
  border-radius: 8px;
  font-family: var(--font-body);
  outline: none;
  transition: border-color .2s, box-shadow .15s;
}
.auth-message { font-size: 0.88rem; text-align: center; min-height: 20px; }
.auth-message.success { color: var(--green); }
.auth-message.error { color: var(--danger); }

/* Shared surfaces */
.section-title { font-family: var(--font-head); font-weight: 800; }
.card,
.auth-box,
.account-card,
.plan-card,
.stat-card,
.analysis-card,
.feature-card,
.step,
.pricing-card,
.premium-card,
.auth-form-container {
  border-radius: var(--radius);
}
.badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.badge-free { background: var(--green-dim); color: var(--green); }