:root {
  --border-radius-m: 8px;
  --border-radius-s: 4px;
  --weight-regular: 400;
  --weight-medium: 500;
  --weight-semi-bold: 600;
  --weight-bold: 700;
  --fs-title-h3: 32px;
  --fs-title-h4: 24px;
  --fs-title-h5: 20px;
  --fs-text-t1: 18px;
  --fs-text-t2: 16px;
  --fs-text-t3: 14px;
  --fs-text-t4: 12px;
  --product-primary-50: #67b279;
  --product-primary-60: #5b9f6b;
  --product-primary-70: #4e8c5d;
  --gray-0: #fff;
  --gray-10: #f6f6f6;
  --gray-20: #e4e4e4;
  --gray-30: #d2d2d2;
  --gray-40: silver;
  --gray-50: #a4a4a4;
  --gray-60: #7f7f7f;
  --gray-70: #5b5b5b;
  --gray-80: #3d3d3d;
  --red-10: #f6c2b1;
  --red-50: #e9653a;
  --red-60: #e75727;
  --red-70: #dc4918;
  --default-page-background: var(--gray-0);
  --default-cards-background: var(--gray-0);
  --default-popup-background: var(--gray-0);
  --default-main-text: var(--gray-80);
  --default-description-text: var(--gray-70);
  --default-link: var(--product-primary-50);
  --default-input-background: var(--gray-10);
  --default-active-input-stroke: var(--gray-50);
  --default-inactive-input-stroke: var(--gray-30);
  --default-main-button: var(--product-primary-50);
  --hovered-main-button: var(--product-primary-60);
  --pressed-main-button: var(--product-primary-70);
  --default-danger-button: var(--red-50);
  --hovered-danger-button: var(--red-60);
  --modal-overlay: #00000050;
  --content-width-12-col: 1224px;
}

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

body {
  background-color: var(--default-page-background);
  color: var(--default-main-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  min-width: 360px;
}

.page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header Styles */
.header {
  background-color: var(--default-cards-background);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--gray-20);
}

.header__container {
  max-width: var(--content-width-12-col);
  margin: 0 auto;
  padding: 0 24px;
}

.header__in {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.header-logo__link svg {
  height: 40px;
  width: auto;
}

.header-nav {
  display: flex;
  gap: 8px;
}

.nav-link {
  color: var(--default-main-text);
  text-decoration: none;
  padding: 8px 16px;
  border-radius: var(--border-radius-s);
  font-weight: var(--weight-medium);
  transition: all 0.2s;
}

.nav-link:hover {
  background: var(--gray-10);
}

.nav-link.active {
  background: var(--product-primary-50);
  color: white;
}

/* Main Content */
.main {
  flex: 1;
  padding: 40px 0;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Page Title */
.page-title {
  text-align: center;
  margin-bottom: 40px;
}

.page-title h1 {
  font-size: var(--fs-title-h3);
  font-weight: var(--weight-bold);
  margin-bottom: 8px;
}

.page-title p {
  color: var(--default-description-text);
  font-size: var(--fs-text-t2);
}

/* Card Styles */
.card {
  background: var(--default-cards-background);
  border-radius: var(--border-radius-m);
  padding: 24px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  border: 1px solid var(--gray-20);
  margin-bottom: 24px;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.card-title {
  font-size: var(--fs-title-h4);
  font-weight: var(--weight-bold);
  color: var(--default-main-text);
}

/* Alias Display */
.alias-display {
  background: var(--gray-10);
  border-radius: var(--border-radius-s);
  padding: 20px;
  text-align: center;
  margin-bottom: 20px;
}

.alias-email-large {
  font-family: 'Monaco', 'Courier New', monospace;
  font-size: var(--fs-text-t1);
  color: var(--default-link);
  font-weight: var(--weight-semi-bold);
  word-break: break-all;
  margin-bottom: 12px;
}

.alias-meta-info {
  display: flex;
  justify-content: center;
  gap: 24px;
  font-size: var(--fs-text-t3);
  color: var(--default-description-text);
  margin-bottom: 16px;
}

.alias-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Generate Section */
.generate-section {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.generate-section input {
  flex: 1;
  min-width: 200px;
}

.domain-select {
  padding: 12px;
  border: 2px solid var(--default-inactive-input-stroke);
  border-radius: var(--border-radius-s);
  font-size: var(--fs-text-t2);
  background-color: var(--default-input-background);
  min-width: 150px;
}

/* Input Styles */
input[type="text"] {
  padding: 12px;
  border: 2px solid var(--default-inactive-input-stroke);
  border-radius: var(--border-radius-s);
  font-size: var(--fs-text-t2);
  background-color: var(--default-input-background);
  transition: border-color 0.2s;
}

input[type="text"]:focus,
.domain-select:focus {
  outline: none;
  border-color: var(--default-active-input-stroke);
}

/* Button Styles */
.btn {
  padding: 12px 24px;
  border: none;
  border-radius: var(--border-radius-s);
  font-size: var(--fs-text-t2);
  font-weight: var(--weight-semi-bold);
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.btn-primary {
  background: var(--default-main-button);
  color: white;
}

.btn-primary:hover {
  background: var(--hovered-main-button);
  transform: translateY(-1px);
}

.btn-secondary {
  background: white;
  color: var(--default-main-text);
  border: 1px solid var(--gray-30);
  padding: 8px 16px;
  font-size: var(--fs-text-t3);
}

.btn-secondary:hover {
  background: var(--gray-10);
}

.btn-danger {
  background: var(--default-danger-button);
  color: white;
  padding: 8px 16px;
  font-size: var(--fs-text-t3);
}

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

/* Email List */
.email-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.email-item {
  background: var(--gray-10);
  border-radius: var(--border-radius-s);
  padding: 16px;
  border: 1px solid var(--gray-20);
  cursor: pointer;
  transition: all 0.2s;
}

.email-item:hover {
  border-color: var(--product-primary-50);
  box-shadow: 0 2px 8px rgba(103, 178, 121, 0.1);
}

.email-item-header {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 16px;
}

.email-from {
  font-weight: var(--weight-semi-bold);
  color: var(--default-main-text);
  font-size: var(--fs-text-t2);
  margin-bottom: 4px;
}

.email-subject {
  color: var(--default-link);
  font-weight: var(--weight-medium);
  font-size: var(--fs-text-t3);
}

.email-time {
  font-size: var(--fs-text-t4);
  color: var(--gray-50);
  white-space: nowrap;
}

/* Email Detail Modal */
.email-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--modal-overlay);
  backdrop-filter: blur(4px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.email-modal.active {
  display: flex;
}

.email-modal-content {
  background: var(--default-popup-background);
  border-radius: var(--border-radius-m);
  max-width: 800px;
  width: 100%;
  max-height: 90vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
  from {
    transform: translateY(-50px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.email-modal-header {
  padding: 24px;
  border-bottom: 1px solid var(--gray-20);
  display: flex;
  justify-content: space-between;
  align-items: start;
}

.email-modal-info h3 {
  font-size: var(--fs-title-h5);
  font-weight: var(--weight-bold);
  margin-bottom: 8px;
}

.email-modal-meta {
  font-size: var(--fs-text-t3);
  color: var(--default-description-text);
  margin-bottom: 4px;
}

.email-modal-close {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--gray-50);
  padding: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--border-radius-s);
}

.email-modal-close:hover {
  background: var(--gray-10);
}

.email-modal-body {
  padding: 24px;
  overflow-y: auto;
  flex: 1;
}

.email-body-content {
  line-height: 1.6;
  word-break: break-word;
}

.email-body-content a {
  color: var(--default-link);
  text-decoration: underline;
}

.email-modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--gray-20);
  display: flex;
  gap: 12px;
  justify-content: flex-end;
}

/* Alias List Page */
.alias-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.alias-list-item {
  background: var(--gray-10);
  border-radius: var(--border-radius-s);
  padding: 16px;
  border: 1px solid var(--gray-20);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.alias-list-info {
  flex: 1;
  min-width: 200px;
}

.alias-list-email {
  font-family: 'Monaco', 'Courier New', monospace;
  font-size: var(--fs-text-t2);
  color: var(--default-link);
  font-weight: var(--weight-semi-bold);
  word-break: break-all;
  margin-bottom: 4px;
}

.alias-list-meta {
  font-size: var(--fs-text-t3);
  color: var(--default-description-text);
}

.alias-list-actions {
  display: flex;
  gap: 8px;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--default-description-text);
}

.empty-state svg {
  width: 64px;
  height: 64px;
  margin-bottom: 16px;
  opacity: 0.5;
  color: var(--gray-50);
}

.empty-state p {
  font-size: var(--fs-text-t2);
}

/* Loading Animation */
.loading {
  text-align: center;
  padding: 40px 20px;
  color: var(--default-description-text);
}

.loading-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 16px;
}

.loading-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--default-link);
  animation: loading 1.4s infinite ease-in-out both;
}

.loading-dot:nth-child(1) {
  animation-delay: -0.32s;
}

.loading-dot:nth-child(2) {
  animation-delay: -0.16s;
}

@keyframes loading {
  0%, 80%, 100% {
    transform: scale(0);
    opacity: 0.5;
  }
  40% {
    transform: scale(1);
    opacity: 1;
  }
}

/* Toast Notification */
.toast {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: var(--default-popup-background);
  padding: 16px 24px;
  border-radius: var(--border-radius-s);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  display: flex;
  align-items: center;
  gap: 12px;
  z-index: 2000;
  animation: toastSlideIn 0.3s ease-out;
  max-width: 400px;
}

@keyframes toastSlideIn {
  from {
    transform: translateX(400px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

.toast.removing {
  animation: toastSlideOut 0.3s ease-out forwards;
}

@keyframes toastSlideOut {
  to {
    transform: translateX(400px);
    opacity: 0;
  }
}

.toast-icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

.toast.success .toast-icon {
  color: var(--product-primary-50);
}

.toast.error .toast-icon {
  color: var(--red-50);
}

.toast-message {
  color: var(--default-main-text);
  font-weight: var(--weight-medium);
}

/* Confirmation Modal */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--modal-overlay);
  backdrop-filter: blur(4px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.modal-overlay.active {
  display: flex;
}

.modal {
  background: var(--default-popup-background);
  border-radius: var(--border-radius-m);
  padding: 30px;
  max-width: 400px;
  width: 90%;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  animation: modalSlideIn 0.3s ease-out;
}

.modal-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.modal-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--red-10);
  color: var(--red-50);
}

.modal-title {
  font-size: var(--fs-title-h4);
  font-weight: var(--weight-semi-bold);
}

.modal-body {
  color: var(--default-description-text);
  line-height: 1.6;
  margin-bottom: 25px;
}

.modal-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
}

/* Responsive Design */
@media (max-width: 768px) {
  .header__in {
    height: 56px;
  }
  
  .header-nav {
    flex-direction: column;
    width: 100%;
  }
  
  .container {
    padding: 0 16px;
  }
  
  .main {
    padding: 24px 0;
  }
  
  .card {
    padding: 16px;
  }
  
  .generate-section {
    flex-direction: column;
  }
  
  .generate-section input,
  .domain-select,
  .btn {
    width: 100%;
  }
  
  .alias-actions,
  .alias-list-actions {
    width: 100%;
  }
  
  .email-item-header {
    flex-direction: column;
  }
  
  .email-time {
    align-self: flex-start;
  }
  
  .alias-list-item {
    flex-direction: column;
    align-items: stretch;
  }
  
  .alias-list-actions {
    flex-wrap: wrap;
  }
  
  .email-modal-content {
    max-height: 100vh;
    border-radius: 0;
  }
}

/* ---- Custom Alias Mode Toggle ---- */
.alias-mode-toggle {
  display: flex;
  gap: 6px;
  margin-bottom: 14px;
}

.mode-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border: 2px solid var(--default-inactive-input-stroke);
  border-radius: var(--border-radius-s);
  background: var(--default-input-background);
  color: var(--default-description-text);
  font-size: var(--fs-text-t3);
  font-weight: var(--weight-medium);
  cursor: pointer;
  transition: all 0.18s ease;
}

.mode-btn:hover {
  border-color: var(--gray-50);
  color: var(--default-main-text);
}

.mode-btn.active {
  border-color: var(--product-primary-50);
  background: #edf7f0;
  color: var(--product-primary-60);
}

/* ---- Custom Username Row ---- */
.custom-username-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 12px;
  width: 100%;
}

.custom-username-input-wrap {
  display: flex;
  align-items: stretch;
  border: 2px solid var(--default-inactive-input-stroke);
  border-radius: var(--border-radius-s);
  overflow: hidden;
  background: var(--default-input-background);
  transition: border-color 0.2s;
}

.custom-username-input-wrap:focus-within {
  border-color: var(--default-active-input-stroke);
}

.custom-username-input-wrap input[type="text"] {
  flex: 1;
  border: none;
  background: transparent;
  padding: 10px 12px;
  font-family: 'Monaco', 'Courier New', monospace;
  font-size: var(--fs-text-t2);
  outline: none;
  min-width: 0;
}

.username-suffix {
  display: flex;
  align-items: center;
  padding: 0 14px;
  font-family: 'Monaco', 'Courier New', monospace;
  font-size: var(--fs-text-t3);
  color: var(--product-primary-60);
  background: #edf7f0;
  border-left: 1px solid var(--default-inactive-input-stroke);
  white-space: nowrap;
  font-weight: var(--weight-medium);
  user-select: none;
}

.username-hint {
  font-size: var(--fs-text-t4);
  color: var(--default-description-text);
  padding-left: 2px;
  transition: color 0.2s;
}

.username-hint code {
  background: var(--gray-20);
  padding: 1px 4px;
  border-radius: 3px;
  font-size: 11px;
}

/* Responsive: stack custom username row on mobile */
@media (max-width: 768px) {
  .custom-username-input-wrap input[type="text"] {
    font-size: var(--fs-text-t3);
  }
}