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

:root {
  --bg: #f5f5f5;
  --card-bg: #ffffff;
  --text: #1a1a1a;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --danger: #dc2626;
  --danger-hover: #b91c1c;
  --danger-light: #fef2f2;
  --danger-border: #fecaca;
  --success: #16a34a;
  --success-light: #f0fdf4;
  --success-border: #bbf7d0;
  --focus: #3b82f6;
  --input-bg: #f9fafb;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111827;
    --card-bg: #1f2937;
    --text: #f9fafb;
    --text-muted: #9ca3af;
    --border: #374151;
    --danger-light: #451a1a;
    --danger-border: #7f1d1d;
    --success-light: #14532d;
    --success-border: #166534;
    --input-bg: #374151;
  }
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

.container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 1rem;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  width: 100%;
  max-width: 440px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.header {
  text-align: center;
  margin-bottom: 1.5rem;
}

.header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.subtitle {
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* Warning Box */
.warning-box {
  display: flex;
  gap: 0.75rem;
  padding: 1rem;
  background: var(--danger-light);
  border: 1px solid var(--danger-border);
  border-radius: 8px;
  margin-bottom: 1.5rem;
  font-size: 0.875rem;
}

.warning-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--danger);
  margin-top: 2px;
}

.warning-box strong {
  color: var(--danger);
}

.warning-box p {
  margin-top: 0.25rem;
  color: var(--text-muted);
}

/* Form */
.form-group {
  margin-bottom: 1.25rem;
}

label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.375rem;
}

input[type="tel"],
input[type="password"],
input[type="text"] {
  width: 100%;
  padding: 0.625rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  background: var(--input-bg);
  color: var(--text);
  transition: border-color 0.15s;
}

input:focus {
  outline: none;
  border-color: var(--focus);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

input.invalid {
  border-color: var(--danger);
}

input.invalid:focus {
  box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.15);
}

.error-text {
  display: block;
  font-size: 0.8rem;
  color: var(--danger);
  min-height: 1.2rem;
  margin-top: 0.25rem;
}

/* Password Toggle */
.password-wrapper {
  position: relative;
}

.password-wrapper input {
  padding-right: 2.75rem;
}

.toggle-password {
  position: absolute;
  right: 0.5rem;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.25rem;
  color: var(--text-muted);
}

.toggle-password:hover {
  color: var(--text);
}

.eye-icon {
  width: 20px;
  height: 20px;
}

/* Buttons */
.btn-delete {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--danger);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.15s;
}

.btn-delete:hover {
  background: var(--danger-hover);
}

.btn-delete:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Result Messages */
.result-message {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem;
  border-radius: 8px;
  margin-top: 1rem;
  font-size: 0.875rem;
  background: var(--success-light);
  border: 1px solid var(--success-border);
  color: var(--success);
}

.result-message svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.result-message.error {
  background: var(--danger-light);
  border-color: var(--danger-border);
  color: var(--danger);
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 1rem;
  z-index: 100;
}

.modal {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  width: 100%;
  max-width: 400px;
  text-align: center;
}

.modal h2 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.modal p {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.modal-detail {
  margin-top: 0.5rem;
  font-size: 0.8rem !important;
}

.modal-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.btn-cancel,
.btn-confirm {
  flex: 1;
  padding: 0.625rem 1rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.15s;
}

.btn-cancel {
  background: var(--input-bg);
  border: 1px solid var(--border);
  color: var(--text);
}

.btn-cancel:hover {
  background: var(--border);
}

.btn-confirm {
  background: var(--danger);
  border: none;
  color: #fff;
}

.btn-confirm:hover {
  background: var(--danger-hover);
}

.btn-confirm:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Utility */
.hidden {
  display: none !important;
}

/* Loading spinner */
.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  vertical-align: middle;
  margin-right: 0.5rem;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}