:root {
  /* AMOLED Pure Dark Theme */
  --bg-color: #000000;
  --surface-color: #111111;
  --surface-hover: #1a1a1a;
  --border-color: #2a2a2a;
  --text-primary: #ffffff;
  --text-secondary: #888888;
  
  /* Vibrant Accents */
  --accent-color: #6366f1; /* Indigo */
  --accent-glow: rgba(99, 102, 241, 0.4);
  
  /* Status Colors */
  --error-color: #ef4444;
  --error-bg: rgba(239, 68, 68, 0.1);
  --success-color: #10b981;
  --success-bg: rgba(16, 185, 129, 0.1);
  
  /* Metrics */
  --border-radius-lg: 16px;
  --border-radius-md: 12px;
  --border-radius-sm: 8px;
  --transition-speed: 0.2s;
  
  /* System Font Stack for Strict CSP */
  --font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-family: var(--font-family);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Animations */
@keyframes fadeIn { 
  from { opacity: 0; transform: translateY(10px); } 
  to { opacity: 1; transform: translateY(0); } 
}

@keyframes spin { 
  100% { transform: rotate(360deg); } 
}

@keyframes pulse { 
  0% { opacity: 0.6; } 
  50% { opacity: 1; transform: scale(1.05); } 
  100% { opacity: 0.6; } 
}

/* Layout */
.container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* Typography */
h1 { font-size: 1.75rem; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 0.5rem; }
h2 { font-size: 1.25rem; font-weight: 600; margin-bottom: 0.5rem; }
h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 1rem; color: var(--text-primary); }
p { color: var(--text-secondary); }

.truncate {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

/* Buttons */
button {
  background-color: var(--accent-color);
  color: #fff;
  border: 1px solid transparent;
  border-radius: var(--border-radius-sm);
  padding: 0.75rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-speed) ease;
  font-family: inherit;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  box-shadow: 0 4px 12px var(--accent-glow);
}

button:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px var(--accent-glow);
  filter: brightness(1.1);
}

button:active:not(:disabled) {
  transform: translateY(0);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  box-shadow: none;
}

button.secondary {
  background-color: var(--surface-color);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  box-shadow: none;
}

button.secondary:hover {
  background-color: var(--surface-hover);
  border-color: #444;
}

button.outline {
  background-color: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
}

button.outline:hover {
  color: var(--text-primary);
  border-color: var(--text-secondary);
}

button.icon-btn {
  padding: 0.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

button.danger {
  background-color: var(--error-bg);
  color: var(--error-color);
  box-shadow: none;
}

button.danger:hover {
  background-color: rgba(239, 68, 68, 0.2);
  border-color: var(--error-color);
}

/* Inputs */
input {
  width: 100%;
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: var(--border-radius-sm);
  padding: 0.85rem 1rem;
  font-size: 1rem;
  font-family: inherit;
  transition: all var(--transition-speed);
  margin-bottom: 1rem;
}

input:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* Login View */
#login-view {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-card {
  width: 100%;
  max-width: 400px;
  background: var(--surface-color);
  padding: 2.5rem 2rem;
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--border-color);
  text-align: center;
  animation: fadeIn 0.4s ease-out;
  box-shadow: 0 20px 40px rgba(0,0,0,0.8);
}

.logo-icon {
  color: var(--accent-color);
  margin-bottom: 1rem;
  display: inline-block;
}

.login-card .subtitle {
  margin-bottom: 2rem;
  font-size: 0.95rem;
}

.login-card button {
  width: 100%;
  margin-top: 0.5rem;
}

/* App View */
#app-view {
  animation: fadeIn 0.4s ease-out;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 0.75rem;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.25rem;
  color: var(--text-primary);
}

.header-actions {
  display: flex;
  gap: 0.5rem;
}

.view-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  gap: 1rem;
}

/* App Accordion Layout */
.single-column {
  max-width: 900px;
  margin: 0 auto;
  width: 100%;
}

.app-layout {
  display: flex;
  flex: 1;
  align-items: start;
}

#addresses-view {
  width: 100%;
}

.layout-col {
  display: flex;
  flex-direction: column;
  flex: 1;
  width: 100%;
  height: calc(100vh - 80px);
  overflow-y: auto;
  padding-right: 0.5rem;
}

.layout-col::-webkit-scrollbar {
  width: 6px;
}
.layout-col::-webkit-scrollbar-track {
  background: transparent;
}
.layout-col::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 10px;
}

/* Mobile defaults */
.mobile-only {
  display: none;
}

/* Admin Panel Layout */
.admin-section {
  margin-top: 0.5rem;
}

.admin-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.admin-user-card {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  overflow: hidden;
  transition: border-color var(--transition-speed);
}

.admin-user-card.active {
  border-color: var(--accent-color);
}

.admin-user-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  cursor: pointer;
  gap: 0.75rem;
}

.admin-user-header:hover {
  background: var(--surface-hover);
}

.admin-user-name {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.admin-user-date {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.admin-user-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.admin-token-badge {
  font-size: 0.7rem;
  padding: 0.15rem 0.5rem;
  border-radius: 2rem;
  background: var(--surface-hover);
  color: var(--text-secondary);
  font-weight: 500;
}

.admin-expand-icon {
  color: var(--text-secondary);
  transition: transform var(--transition-speed);
}

.admin-user-card.active .admin-expand-icon {
  transform: rotate(90deg);
}

.admin-user-body {
  display: none;
  border-top: 1px solid var(--border-color);
  padding: 1rem;
  background: rgba(255,255,255,0.02);
}

.admin-user-card.active .admin-user-body {
  display: block;
}

.admin-tokens-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.admin-tokens-header h4 {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin: 0;
}

.admin-token-card {
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  padding: 0.75rem;
  margin-bottom: 0.5rem;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.5rem;
}

.admin-token-info {
  flex: 1;
  min-width: 0;
}

.admin-token-label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.admin-token-value {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.75rem;
  color: var(--text-secondary);
  word-break: break-all;
  background: var(--surface-color);
  padding: 0.35rem 0.5rem;
  border-radius: 4px;
  margin-top: 0.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.admin-token-actions {
  display: flex;
  gap: 0.5rem;
  flex-shrink: 0;
  align-items: center;
}

/* Lists and Cards */
.address-list, .message-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  flex: 1;
}

.address-card, .message-card {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  cursor: pointer;
  transition: all var(--transition-speed);
}

.address-card:hover, .message-card:hover {
  border-color: var(--text-secondary);
  background-color: var(--surface-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(0,0,0,0.4);
}

.address-card.active {
  border-color: var(--accent-color);
  background: rgba(99, 102, 241, 0.05);
}

.address-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.actions {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.msg-header {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.msg-header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.message-card.active {
  border-color: var(--accent-color);
  background: rgba(99, 102, 241, 0.05);
}

.inbox-accordion {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  animation: slideDown 0.2s ease-out;
}

.mail-accordion-body {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  height: 500px;
  animation: slideDown 0.2s ease-out;
}

.mail-accordion-body iframe {
  flex: 1;
  width: 100%;
  border: none;
  background: var(--surface-color);
  border-radius: var(--border-radius-sm);
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Address Card Info */
.address-info {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  overflow: hidden;
}

.address-card .email {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.address-card .date {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.address-card .meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.address-card .status {
  font-size: 0.7rem;
  padding: 0.2rem 0.5rem;
  border-radius: 2rem;
  background: var(--success-bg);
  color: var(--success-color);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Message Card */
.message-card {
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
}

.msg-header {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
}

.message-card .sender {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.9rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.message-card .subject {
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.message-card .date {
  font-size: 0.75rem;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.message-card.unread {
  border-left: 4px solid var(--accent-color);
}

/* Mail Detail */
.mail-detail {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.mail-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  background: rgba(255,255,255,0.02);
  position: relative;
}

.mail-header .field {
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
}

.mail-header .field strong {
  width: 70px;
  color: var(--text-secondary);
  font-weight: 500;
  flex-shrink: 0;
}

.copy-btn {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  padding: 0.4rem 0.8rem;
  font-size: 0.8rem;
}

.mail-body {
  padding: 1.5rem;
  background: var(--bg-color);
  flex: 1;
  overflow-y: auto;
}

.mail-body iframe {
  width: 100%;
  height: 100%;
  min-height: 400px;
  border: none;
  background: transparent;
  border-radius: var(--border-radius-sm);
  color-scheme: dark;
}

.mail-body pre {
  white-space: pre-wrap;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, monospace;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text-primary);
}

/* Utilities */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  background: var(--surface-color);
  border: 1px dashed var(--border-color);
  border-radius: var(--border-radius-md);
  color: var(--text-secondary);
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.error-banner {
  padding: 1rem 1.25rem;
  background: var(--error-bg);
  color: var(--error-color);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--border-radius-sm);
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  animation: fadeIn 0.3s;
}

.loading-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: var(--accent-color);
  z-index: 9999;
  animation: loading-bar-anim 1.5s infinite linear;
  transform-origin: left;
}
@keyframes loading-bar-anim {
  0% { transform: scaleX(0); opacity: 1; }
  50% { transform: scaleX(0.5); opacity: 0.8; }
  100% { transform: scaleX(1); opacity: 0; }
}

.live-dot {
  width: 8px;
  height: 8px;
  background-color: var(--success-color);
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 8px var(--success-color);
  animation: pulse 1.5s infinite;
}

/* Mobile Adjustments */
@media (max-width: 1023px) {
  .app-layout {
    display: block; /* Stack on mobile */
  }

  .layout-col {
    height: auto;
    overflow-y: visible;
    padding-right: 0;
  }

  .mobile-only {
    display: inline-flex;
  }

  .admin-user-header {
    flex-wrap: wrap;
  }

  .admin-token-card {
    flex-direction: column;
  }

  .admin-token-actions {
    width: 100%;
    justify-content: flex-end;
  }
}

/* Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 1rem;
}

.modal-content {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  width: 100%;
  max-width: 800px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 40px rgba(0,0,0,0.5);
  animation: modalPop 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

@keyframes modalPop {
  0% { transform: scale(0.9); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

.modal-header {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h3 {
  margin: 0;
  font-size: 1.2rem;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.modal-actions {
  padding: 1rem 1.5rem 0;
}

.modal-body {
  padding: 1rem 1.5rem 1.5rem;
  flex: 1;
  overflow-y: auto;
}

.modal-body iframe {
  width: 100%;
  height: 60vh;
  min-height: 400px;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  background-color: transparent;
  color-scheme: dark;
}

@media (max-width: 600px) {
  .container {
    padding: 1rem;
  }
  
  .header-actions {
    justify-content: flex-end;
  }
  
  .header-actions button {
    flex: none;
    padding: 0.75rem 0.65rem;
  }
  
  .btn-text {
    display: none;
  }
  
  .address-search-row {
    margin-bottom: 0.75rem;
  }
  .address-search-row input {
    max-width: 100%;
  }

  .mail-header .field {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .mail-header .field strong {
    width: auto;
    margin-bottom: 0.2rem;
  }
  
  .copy-btn {
    position: static;
    margin-top: 1rem;
    width: 100%;
  }
}

/* CSP Utility Classes */
.d-none { display: none !important; }
.mb-1rem { margin-bottom: 1rem; }
.opacity-50 { opacity: 0.5; }
.opacity-30 { opacity: 0.3; }
.m-0 { margin: 0; }
.flex-1 { flex: 1; }
.admin-form { display: flex; gap: 0.5rem; margin-bottom: 1rem; }
.admin-btn-sm { padding: 0.35rem 0.75rem; font-size: 0.8rem; }
.mt-025 { margin-top: 0.25rem; }
.p-2rem { padding: 2rem; }
.address-search-row {
  margin-bottom: 0.75rem;
}
.address-search-row input {
  max-width: 300px;
}
.font-bold { font-weight: 700; }
.accent-color { color: var(--accent-color); }