:root {
  --primary: #0057B8;
  --primary-dark: #003F88;
  --primary-light: #E8F0FE;
  --success: #1B873F;
  --success-bg: #DAFBE1;
  --warning: #BF6A02;
  --warning-bg: #FFF4CC;
  --danger: #CF222E;
  --danger-bg: #FFEBE9;
  --gray: #57606A;
  --gray-bg: #F6F8FA;
  --border: #D0D7DE;
  --bg: #F0F2F5;
  --white: #FFFFFF;
  --shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.08);
  --shadow-lg: 0 4px 12px rgba(0,0,0,0.15);
  --radius: 8px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, sans-serif;
  background: var(--bg);
  color: #24292F;
  line-height: 1.6;
  min-height: 100vh;
}

/* ===== Header ===== */
.header {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: white;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: var(--shadow-lg);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header h1 { font-size: 1.35rem; font-weight: 600; }
.header small { opacity: 0.8; font-size: 0.8rem; display: block; font-weight: 400; }

/* ===== Container ===== */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 24px 16px 60px;
}

/* ===== Tab Bar ===== */
.tab-bar {
  display: flex;
  gap: 0;
  margin-bottom: 20px;
  border-bottom: 2px solid var(--border);
}
.tab-btn {
  padding: 10px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: var(--gray);
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: color 0.2s, border-color 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.tab-btn:hover {
  color: var(--primary);
}
.tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}
.tab-panel {
  display: none;
}
.tab-panel.active {
  display: block;
}

/* ===== Settings Panel ===== */
.settings-toggle {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 20px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.settings-toggle summary {
  padding: 12px 16px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--gray);
  user-select: none;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
}
.settings-toggle summary::before { content: '⚙️'; }
.settings-toggle summary::-webkit-details-marker { display: none; }
.settings-body {
  padding: 0 16px 16px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.settings-body .full-width { grid-column: 1 / -1; }

/* ===== Card / Fieldset ===== */
.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 20px;
  box-shadow: var(--shadow);
  overflow: hidden;
}
.card-header {
  background: var(--primary-light);
  border-bottom: 1px solid var(--border);
  padding: 12px 16px;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--primary-dark);
  display: flex;
  align-items: center;
  gap: 8px;
}
.card-header-urgent {
  background: var(--danger-bg);
  color: var(--danger);
  border-bottom-color: var(--danger);
}
.card-body { padding: 16px; }

/* ===== Form Grid ===== */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.form-grid .full-width { grid-column: 1 / -1; }

.form-group { display: flex; flex-direction: column; gap: 4px; }
.form-group label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--gray);
  text-transform: uppercase;
  letter-spacing: 0.3px;
}
.form-group label .req { color: var(--danger); }
.form-group input, .form-group select {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.92rem;
  font-family: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
  background: var(--white);
}
.form-group input:focus, .form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0,87,184,0.15);
}
.form-group input.invalid {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px rgba(207,34,46,0.12);
}

/* ===== Phone Rows ===== */
.phone-row {
  display: flex;
  gap: 8px;
  align-items: end;
  margin-bottom: 8px;
}
.phone-row .form-group { flex: 1; }
.phone-row .form-group:last-of-type { flex: 0 0 130px; }
.btn-remove-phone {
  background: var(--danger-bg);
  color: var(--danger);
  border: 1px solid var(--danger);
  border-radius: 6px;
  width: 34px;
  height: 34px;
  cursor: pointer;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1px;
  flex-shrink: 0;
}
.btn-add-phone {
  background: none;
  border: 1px dashed var(--primary);
  color: var(--primary);
  border-radius: 6px;
  padding: 6px 12px;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  margin-top: 4px;
}

/* ===== Checkbox ===== */
.checkbox-group {
  flex-direction: row;
  align-items: center;
  gap: 8px;
  padding-top: 6px;
}
.checkbox-group input[type="checkbox"] {
  width: 18px;
  height: 18px;
  margin: 4px;
  accent-color: var(--primary);
}
.checkbox-group label {
  font-size: 0.88rem;
  font-weight: 500;
  color: #24292F;
  text-transform: none;
  letter-spacing: 0;
}

/* ===== Buttons ===== */
.form-actions {
  display: flex;
  gap: 12px;
  margin-top: 8px;
}
.btn {
  padding: 10px 24px;
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  font-family: inherit;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; }
.btn-secondary {
  background: var(--white);
  color: var(--gray);
  border: 1px solid var(--border);
}
.btn-secondary:hover { background: var(--gray-bg); }
.btn-demo {
  background: var(--primary-light);
  color: var(--primary);
  border: 1px solid var(--primary);
}
.btn-demo:hover { background: #d0e3fc; }

/* ===== Sample Loader ===== */
.sample-bar {
  display: flex;
  margin-bottom: 20px;
}
.sample-select {
  display: block;
  width: 100%;
  text-align: left;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  cursor: pointer;
  padding-right: 32px;
  transition: background-color 0.2s, box-shadow 0.2s;
  background: var(--primary-light) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%230057B8' d='M2 4l4 4 4-4'/%3E%3C/svg%3E") no-repeat right 10px center;
}
.sample-select:hover {
  background: #d0e3fc url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%230057B8' d='M2 4l4 4 4-4'/%3E%3C/svg%3E") no-repeat right 10px center;
}
.sample-select:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(0,87,184,0.15);
}

/* ===== Spinner ===== */
.spinner {
  width: 18px; height: 18px;
  border: 2.5px solid rgba(255,255,255,0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: none;
}
.btn-primary.loading .spinner { display: inline-block; }
.btn-primary.loading .btn-text { display: none; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== Alert ===== */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius);
  margin-bottom: 16px;
  font-size: 0.9rem;
  display: none;
  align-items: start;
  gap: 8px;
}
.alert.show { display: flex; }
.alert-error { background: var(--danger-bg); color: var(--danger); border: 1px solid var(--danger); }
.alert-dismiss {
  margin-left: auto;
  background: none;
  border: none;
  color: inherit;
  cursor: pointer;
  font-size: 1.1rem;
  line-height: 1;
  padding: 0 4px;
}

/* ===== Results ===== */
.match-action-bar {
  margin-bottom: 20px;
}
.match-action-bar .btn-primary {
  width: 100%;
  justify-content: center;
}
#results-section { display: block; }

.result-status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 20px;
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.status-VERIFIED { background: var(--success-bg); color: var(--success); }
.status-NOT_VERIFIED { background: var(--primary-light); color: var(--primary); }
.status-OPT_OUT { background: var(--danger-bg); color: var(--danger); }
.status-NO_MATCH { background: var(--gray-bg); color: var(--gray); }
.tracking-id { font-size: 0.8rem; color: var(--gray); font-family: monospace; }

.result-card { margin-bottom: 16px; }
.result-card .card-body { padding: 16px; }

.info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 24px;
}
.info-item { padding: 4px 0; }
.info-label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  color: var(--gray);
  font-weight: 600;
}
.info-value { font-size: 0.95rem; color: #24292F; }
.info-value.empty { color: #999; font-style: italic; }

.result-banner {
  padding: 32px 24px;
  text-align: center;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--white);
  box-shadow: var(--shadow);
}
.result-banner .icon { font-size: 2.5rem; margin-bottom: 8px; }
.result-banner h3 { font-size: 1.1rem; margin-bottom: 4px; }
.result-banner p { color: var(--gray); font-size: 0.9rem; }

.section-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 12px 0;
}
.group-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--gray);
  text-transform: uppercase;
  letter-spacing: 0.3px;
  margin-bottom: 6px;
  display: block;
}

/* ===== Log Panel ===== */
.log-panel {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.log-body {
  max-height: 600px;
  overflow-y: auto;
  padding: 0 16px 16px;
}
.log-entry {
  font-family: 'Consolas', 'Courier New', monospace;
  font-size: 0.78rem;
  line-height: 1.5;
  padding: 6px 0;
  border-bottom: 1px solid var(--border);
  white-space: pre-wrap;
  word-break: break-all;
}
.log-entry:last-child { border-bottom: none; }
.log-entry.log-info { color: var(--primary); }
.log-entry.log-success { color: var(--success); }
.log-entry.log-error { color: var(--danger); }
.log-entry.log-warn { color: var(--warning); }
.log-entry .log-time { color: var(--gray); margin-right: 8px; }
.log-actions {
  padding: 8px 16px;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 8px;
}
.log-actions button {
  font-size: 0.78rem;
  padding: 4px 10px;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--gray-bg);
  cursor: pointer;
  font-family: inherit;
  color: var(--gray);
}
.log-actions button:hover { background: var(--border); }

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .form-grid, .settings-body, .info-grid { grid-template-columns: 1fr; }
  .form-grid .full-width, .settings-body .full-width { grid-column: 1; }
  .phone-row { flex-wrap: wrap; }
  .phone-row .form-group:last-of-type { flex: 1 1 100%; }
  .form-actions { flex-direction: column; }
  .btn { justify-content: center; }
  .result-status-bar { flex-direction: column; align-items: start; }
}