:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #16161f;
  --bg-hover: #1a1a25;
  --border: #2a2a3a;
  --text-primary: #e8e8ed;
  --text-secondary: #9090a8;
  --text-muted: #606078;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

.theme-light {
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f7;
  --bg-card: #ffffff;
  --bg-hover: #f9f9fb;
  --border: #e0e0e5;
  --text-primary: #1a1a2e;
  --text-secondary: #6b6b80;
  --text-muted: #9090a8;
}

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

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background 0.3s, color 0.3s;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 20px;
}

/* Header */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0;
  margin-bottom: 32px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.5rem;
  font-weight: 700;
}

.logo-icon {
  font-size: 1.8rem;
}

.logo-text {
  font-family: var(--font-mono);
}

.btn-icon {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-icon:hover {
  background: var(--bg-hover);
  border-color: var(--accent);
}

.theme-dark .icon-sun { display: none; }
.theme-light .icon-moon { display: none; }

/* Email Display */
.email-display {
  margin-bottom: 24px;
}

.email-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  transition: all 0.3s;
}

.email-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.email-address-wrapper {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
}

.email-address {
  flex: 1;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--text-primary);
  cursor: text;
}

.btn-copy {
  background: var(--accent);
  border: none;
  border-radius: 8px;
  padding: 12px 20px;
  color: white;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s;
  white-space: nowrap;
}

.btn-copy:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-copy.copied {
  background: var(--success);
}

.email-timer {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.timer-icon {
  font-size: 1.1rem;
}

/* Actions */
.actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 24px;
}

.btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 20px;
  color: var(--text-primary);
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all 0.2s;
  font-size: 0.95rem;
}

.btn:hover {
  background: var(--bg-hover);
  border-color: var(--accent);
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-secondary {
  background: var(--bg-secondary);
}

/* Custom Email */
.custom-email {
  margin-bottom: 32px;
}

.custom-email-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
}

.custom-email-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.custom-form {
  display: flex;
  gap: 12px;
  margin-bottom: 8px;
}

.input-group {
  flex: 1;
  display: flex;
  gap: 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 4px;
}

.input {
  flex: 1;
  background: transparent;
  border: none;
  padding: 8px 12px;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  outline: none;
}

.input-select {
  background: var(--bg-card);
  border-radius: 6px;
  cursor: pointer;
  min-width: 200px;
}

.input-separator {
  display: flex;
  align-items: center;
  color: var(--text-muted);
  font-family: var(--font-mono);
  padding: 0 4px;
}

.custom-email-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 8px;
}

/* Inbox */
.inbox {
  margin-bottom: 32px;
}

.inbox-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.inbox-header h2 {
  font-size: 1.25rem;
  font-weight: 700;
}

.inbox-stats {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.inbox-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.inbox-empty {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 48px 24px;
  text-align: center;
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: 16px;
}

.inbox-empty p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.message-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  cursor: pointer;
  transition: all 0.2s;
}

.message-item:hover {
  background: var(--bg-hover);
  border-color: var(--accent);
  transform: translateX(4px);
}

.message-from {
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--text-primary);
}

.message-subject-preview {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 4px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.message-date {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* Message Viewer */
.message-viewer {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 32px;
}

.btn-back {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 16px;
  color: var(--text-primary);
  cursor: pointer;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s;
  margin-bottom: 20px;
}

.btn-back:hover {
  background: var(--bg-hover);
}

.message-subject {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.message-meta {
  background: var(--bg-secondary);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 20px;
}

.meta-row {
  display: flex;
  gap: 12px;
  margin-bottom: 8px;
  font-size: 0.9rem;
}

.meta-row:last-child {
  margin-bottom: 0;
}

.meta-label {
  color: var(--text-secondary);
  font-weight: 600;
  min-width: 80px;
}

.meta-value {
  color: var(--text-primary);
  word-break: break-all;
}

.message-divider {
  height: 1px;
  background: var(--border);
  margin: 20px 0;
}

.message-body {
  line-height: 1.8;
  color: var(--text-primary);
}

.message-body img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
}

.message-body a {
  color: var(--accent);
}

/* Footer */
.footer {
  text-align: center;
  padding: 32px 0;
  border-top: 1px solid var(--border);
  margin-top: 48px;
}

.footer p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.footer-small {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Responsive */
@media (max-width: 640px) {
  .container {
    padding: 16px 12px;
  }

  .email-address-wrapper {
    flex-direction: column;
  }

  .actions {
    grid-template-columns: 1fr;
  }

  .custom-form {
    flex-direction: column;
  }

  .input-group {
    flex-direction: column;
  }

  .input-select {
    min-width: auto;
  }
}

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

.message-item {
  animation: fadeIn 0.3s ease-out;
}

/* Toast notification */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 20px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  animation: slideUp 0.3s ease-out;
  z-index: 1000;
}

@keyframes slideUp {
  from { transform: translateY(100%); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.toast.success {
  border-color: var(--success);
}

.toast.error {
  border-color: var(--danger);
}