:root {
  --bg: #f4f6f9;
  --surface: #ffffff;
  --border: #e2e8f0;
  --text: #1e293b;
  --text-muted: #64748b;
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --danger: #dc2626;
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.08);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
}

.hidden { display: none !important; }

.auth-view {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.auth-card {
  background: var(--surface);
  border-radius: 16px;
  padding: 40px;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-lg);
}

.auth-brand { text-align: center; margin-bottom: 32px; }
.auth-brand h1 { font-size: 24px; margin: 12px 0 4px; }
.auth-brand p { color: var(--text-muted); font-size: 14px; }

.brand-icon {
  width: 56px; height: 56px;
  background: var(--primary);
  color: #fff;
  border-radius: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 20px;
}

.auth-card label {
  display: block;
  margin-bottom: 16px;
}
.auth-card label span {
  display: block;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text-muted);
}
.auth-card input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 15px;
  transition: border-color 0.15s;
}
.auth-card input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

.form-error {
  color: var(--danger);
  font-size: 13px;
  margin-bottom: 12px;
}

.form-success {
  color: #059669;
  font-size: 13px;
  margin-bottom: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 9px 18px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--primary-hover); }
.btn-block { width: 100%; }

.auth-footer {
  margin-top: 20px;
  font-size: 13px;
  color: var(--text-muted);
  text-align: center;
}
.auth-footer a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}
.auth-footer a:hover { text-decoration: underline; }

.auth-hint {
  margin-top: 16px;
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.6;
}

.captcha-row {
  display: flex;
  gap: 10px;
  align-items: center;
}
.captcha-row input {
  flex: 1;
  min-width: 0;
}
.captcha-image {
  width: 120px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  flex-shrink: 0;
  background: #f5f0ff;
}