:root {
  --red: #C0281C; --red-dark: #9e1f15; --dark: #191922;
  --bg: #f7f7f8; --border: #e5e7eb; --text: #1f2430; --muted: #8a8f9c;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'Segoe UI', Arial, sans-serif; background: var(--bg); color: var(--text); min-height: 100vh; display: flex; flex-direction: column; }
a { color: var(--red); text-decoration: none; }
main { flex: 1; }

.site-header { background: #fff; border-bottom: 3px solid var(--red); padding: 14px 24px; display: flex; align-items: center; gap: 16px; }
.site-header .logo { font-weight: 800; font-size: 20px; color: var(--red); letter-spacing: .5px; }
.site-header .logo small { display: block; font-size: 10px; color: var(--muted); font-weight: 400; letter-spacing: 0; }
.site-header nav { margin-left: auto; display: flex; gap: 18px; font-size: 14px; }
.site-header nav a { color: var(--text); }
.site-header nav a:hover { color: var(--red); }

.site-footer { background: var(--dark); color: #cfd2dc; padding: 24px; text-align: center; font-size: 13px; margin-top: 40px; }

/* Auth kartları */
.auth-wrap { display: flex; justify-content: center; padding: 48px 16px; }
.auth-card { background: #fff; border: 1px solid var(--border); border-radius: 14px; padding: 32px; width: 100%; max-width: 420px; box-shadow: 0 2px 10px rgba(0,0,0,.05); }
.auth-card h1 { font-size: 20px; margin-bottom: 4px; }
.auth-card .sub { color: var(--muted); font-size: 13px; margin-bottom: 22px; }
.form-group { margin-bottom: 14px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 5px; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; font-size: 14px; background: #fff;
}
.form-group input:focus { outline: 2px solid rgba(192,40,28,.25); border-color: var(--red); }
.btn { display: inline-block; background: var(--red); color: #fff; border: none; border-radius: 8px; padding: 11px 18px; font-size: 14px; font-weight: 600; cursor: pointer; width: 100%; }
.btn:hover { background: var(--red-dark); }
.auth-links { margin-top: 16px; font-size: 13px; text-align: center; }
.error { color: var(--red-dark); font-size: 12.5px; margin-top: 4px; }
.alert { padding: 12px 14px; border-radius: 8px; font-size: 13.5px; margin-bottom: 16px; }
.alert-success { background: #d6f5e3; color: #0d7a44; }
.alert-error { background: #fde2e0; color: var(--red-dark); }
.checkbox-row { display: flex; align-items: center; gap: 8px; font-size: 13px; margin-bottom: 14px; }
.checkbox-row input { width: auto; }

.whatsapp-btn { position: fixed; right: 20px; bottom: 20px; background: #25D366; color: #fff; width: 56px; height: 56px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 28px; box-shadow: 0 4px 14px rgba(0,0,0,.25); z-index: 999; }