/* ============================================================
   DESIGN SYSTEM — Direct Send Email Tool
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  /* Colors — Dark theme with electric blue accent */
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-card: #1a1f35;
  --bg-card-hover: #1e2440;
  --bg-input: #0d1220;
  --bg-input-focus: #111830;

  --border-color: rgba(99, 132, 255, 0.15);
  --border-focus: rgba(99, 132, 255, 0.5);
  --border-subtle: rgba(255, 255, 255, 0.06);

  --accent: #6366f1;
  --accent-hover: #818cf8;
  --accent-glow: rgba(99, 102, 241, 0.3);
  --accent-bg: rgba(99, 102, 241, 0.08);

  --success: #10b981;
  --success-bg: rgba(16, 185, 129, 0.1);
  --success-border: rgba(16, 185, 129, 0.3);
  --error: #ef4444;
  --error-bg: rgba(239, 68, 68, 0.1);
  --error-border: rgba(239, 68, 68, 0.3);
  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.1);

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-accent: #a5b4fc;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(99, 102, 241, 0.15);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Ambient background */
body::before {
  content: '';
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background:
    radial-gradient(ellipse at 20% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(139, 92, 246, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 50%, rgba(59, 130, 246, 0.04) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
  animation: ambientDrift 30s ease-in-out infinite alternate;
}

@keyframes ambientDrift {
  0% { transform: translate(0, 0) rotate(0deg); }
  100% { transform: translate(-3%, -3%) rotate(2deg); }
}

/* ============================================================
   LAYOUT
   ============================================================ */
.app-container {
  position: relative;
  z-index: 1;
  max-width: 1400px;
  margin: 0 auto;
  padding: 24px 32px 60px;
}

/* ============================================================
   HEADER
   ============================================================ */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0 32px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 32px;
}

.app-logo {
  display: flex;
  align-items: center;
  gap: 14px;
}

.logo-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--accent) 0%, #8b5cf6 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  box-shadow: var(--shadow-glow);
}

.logo-text h1 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-text p {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 400;
  margin-top: 1px;
}

.header-status {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: background var(--transition-base);
}

.status-dot.connected {
  background: var(--success);
  box-shadow: 0 0 8px rgba(16, 185, 129, 0.5);
  animation: pulse 2s infinite;
}

.status-dot.error {
  background: var(--error);
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ============================================================
   TABS NAVIGATION
   ============================================================ */
.tabs-nav {
  display: flex;
  gap: 4px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 5px;
  margin-bottom: 28px;
  width: fit-content;
}

.tab-btn {
  position: relative;
  padding: 10px 24px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  display: flex;
  align-items: center;
  gap: 8px;
}

.tab-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
}

.tab-btn.active {
  color: var(--text-primary);
  background: var(--bg-card);
  box-shadow: var(--shadow-sm);
}

.tab-btn .tab-icon {
  font-size: 1rem;
}

.tab-panel {
  display: none;
  animation: fadeIn 0.3s ease;
}

.tab-panel.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============================================================
   GRID LAYOUT
   ============================================================ */
.main-grid {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 24px;
  align-items: start;
}

@media (max-width: 1100px) {
  .main-grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================================
   CARDS
   ============================================================ */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
  border-color: rgba(99, 132, 255, 0.25);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  border-bottom: 1px solid var(--border-subtle);
}

.card-header h2 {
  font-size: 0.95rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-header h2 .icon {
  font-size: 1.1rem;
}

.card-body {
  padding: 22px;
}

/* ============================================================
   FORM ELEMENTS
   ============================================================ */
.form-group {
  margin-bottom: 18px;
}

.form-group:last-child {
  margin-bottom: 0;
}

.form-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 7px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 11px 14px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
  outline: none;
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-muted);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  background: var(--bg-input-focus);
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-textarea {
  resize: vertical;
  min-height: 80px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.5;
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2394a3b8' viewBox='0 0 16 16'%3E%3Cpath d='M4.646 5.646a.5.5 0 0 1 .708 0L8 8.293l2.646-2.647a.5.5 0 0 1 .708.708l-3 3a.5.5 0 0 1-.708 0l-3-3a.5.5 0 0 1 0-.708z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.form-helper {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 5px;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  outline: none;
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent) 0%, #8b5cf6 100%);
  color: white;
  box-shadow: 0 2px 12px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.5);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

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

.btn-secondary:hover {
  border-color: var(--border-focus);
  color: var(--text-primary);
  background: var(--bg-card-hover);
}

.btn-success {
  background: linear-gradient(135deg, #059669 0%, #10b981 100%);
  color: white;
  box-shadow: 0 2px 12px rgba(16, 185, 129, 0.25);
}

.btn-success:hover {
  box-shadow: 0 4px 20px rgba(16, 185, 129, 0.4);
  transform: translateY(-1px);
}

.btn-success:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-danger {
  background: linear-gradient(135deg, #dc2626 0%, #ef4444 100%);
  color: white;
}

.btn-sm {
  padding: 7px 14px;
  font-size: 0.8rem;
}

.btn-lg {
  padding: 14px 32px;
  font-size: 0.95rem;
}

.btn-block {
  width: 100%;
}

.btn-icon {
  font-size: 1rem;
}

/* Loading spinner in button */
.btn .spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

/* ============================================================
   CONNECTION PANEL
   ============================================================ */
.connection-card {
  position: sticky;
  top: 24px;
}

.connection-status-bar {
  margin-top: 14px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  display: none;
  align-items: center;
  gap: 8px;
}

.connection-status-bar.visible {
  display: flex;
}

.connection-status-bar.success {
  background: var(--success-bg);
  border: 1px solid var(--success-border);
  color: var(--success);
}

.connection-status-bar.error {
  background: var(--error-bg);
  border: 1px solid var(--error-border);
  color: var(--error);
}

/* ============================================================
   RECIPIENTS
   ============================================================ */
.recipient-mode-toggle {
  display: flex;
  gap: 4px;
  background: var(--bg-input);
  border-radius: var(--radius-sm);
  padding: 3px;
  margin-bottom: 16px;
}

.mode-btn {
  flex: 1;
  padding: 8px 12px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 500;
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mode-btn.active {
  background: var(--accent);
  color: white;
}

.recipient-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 8px;
  min-height: 46px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-fast);
}

.recipient-tags:focus-within {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.recipient-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: var(--accent-bg);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: 20px;
  font-size: 0.78rem;
  color: var(--text-accent);
  animation: tagIn 0.2s ease;
}

@keyframes tagIn {
  from { opacity: 0; transform: scale(0.8); }
  to { opacity: 1; transform: scale(1); }
}

.recipient-tag .remove-tag {
  cursor: pointer;
  opacity: 0.6;
  transition: opacity var(--transition-fast);
  font-size: 1rem;
  line-height: 1;
}

.recipient-tag .remove-tag:hover {
  opacity: 1;
}

.recipient-tags input {
  border: none;
  background: transparent;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  outline: none;
  flex: 1;
  min-width: 150px;
  padding: 4px;
}

.recipient-tags input::placeholder {
  color: var(--text-muted);
}

.csv-upload-zone {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px 20px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-base);
}

.csv-upload-zone:hover {
  border-color: var(--accent);
  background: var(--accent-bg);
}

.csv-upload-zone .upload-icon {
  font-size: 2rem;
  margin-bottom: 8px;
}

.csv-upload-zone p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.csv-upload-zone .hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ============================================================
   EMAIL COMPOSER
   ============================================================ */
.composer-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.editor-toggle {
  display: flex;
  gap: 4px;
  background: var(--bg-input);
  border-radius: var(--radius-sm);
  padding: 3px;
}

.editor-toggle-btn {
  padding: 6px 14px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 500;
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.editor-toggle-btn.active {
  background: var(--accent);
  color: white;
}

.html-editor-container {
  position: relative;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  min-height: 350px;
  background: var(--bg-input);
}

/* Quill overrides */
.ql-toolbar.ql-snow {
  border: none !important;
  border-bottom: 1px solid var(--border-subtle) !important;
  background: var(--bg-card) !important;
  padding: 10px 14px !important;
}

.ql-container.ql-snow {
  border: none !important;
  font-family: var(--font-sans) !important;
  font-size: 0.92rem !important;
}

.ql-editor {
  min-height: 280px;
  padding: 20px !important;
  color: var(--text-primary) !important;
  background: var(--bg-input) !important;
}

.ql-editor.ql-blank::before {
  color: var(--text-muted) !important;
  font-style: normal !important;
}

.ql-snow .ql-stroke {
  stroke: var(--text-secondary) !important;
}

.ql-snow .ql-fill {
  fill: var(--text-secondary) !important;
}

.ql-snow .ql-picker-label {
  color: var(--text-secondary) !important;
}

.ql-snow .ql-picker-options {
  background: var(--bg-card) !important;
  border-color: var(--border-color) !important;
  border-radius: var(--radius-sm) !important;
  box-shadow: var(--shadow-lg) !important;
}

.ql-snow .ql-picker-item {
  color: var(--text-primary) !important;
}

.ql-snow .ql-active .ql-stroke {
  stroke: var(--accent) !important;
}

.ql-snow .ql-active .ql-fill {
  fill: var(--accent) !important;
}

.ql-snow .ql-active {
  color: var(--accent) !important;
}

.ql-snow a {
  color: var(--accent) !important;
}

.raw-html-editor {
  display: none;
  width: 100%;
  min-height: 350px;
  padding: 20px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.6;
  resize: vertical;
  outline: none;
  transition: border-color var(--transition-fast);
}

.raw-html-editor:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.raw-html-editor.visible {
  display: block;
}

/* ============================================================
   PREVIEW PANEL
   ============================================================ */
.preview-frame {
  width: 100%;
  min-height: 400px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: white;
  overflow: hidden;
}

.preview-frame iframe {
  width: 100%;
  height: 400px;
  border: none;
}

/* ============================================================
   ATTACHMENTS
   ============================================================ */
.attachment-zone {
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-sm);
  padding: 16px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-base);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.attachment-zone:hover {
  border-color: var(--accent);
  background: var(--accent-bg);
}

.attachment-list {
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.attachment-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  background: var(--bg-input);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
}

.attachment-item .file-info {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
}

.attachment-item .file-size {
  color: var(--text-muted);
  font-size: 0.75rem;
}

.attachment-item .remove-file {
  cursor: pointer;
  color: var(--error);
  opacity: 0.7;
  transition: opacity var(--transition-fast);
}

.attachment-item .remove-file:hover {
  opacity: 1;
}

/* ============================================================
   SEND ACTIONS BAR
   ============================================================ */
.send-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 24px;
  padding: 20px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
}

.send-actions .action-info {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.send-actions .action-info strong {
  color: var(--text-secondary);
}

.send-actions .action-buttons {
  display: flex;
  gap: 10px;
}

/* ============================================================
   BULK SETTINGS
   ============================================================ */
.bulk-settings {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 18px;
  background: var(--warning-bg);
  border: 1px solid rgba(245, 158, 11, 0.2);
  border-radius: var(--radius-sm);
  margin-top: 14px;
  font-size: 0.82rem;
  color: var(--warning);
}

.bulk-settings input {
  width: 80px;
  padding: 6px 10px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  text-align: center;
}

/* ============================================================
   SEND LOG
   ============================================================ */
.send-log {
  margin-top: 24px;
}

.log-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.log-header h3 {
  font-size: 0.9rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.log-entries {
  max-height: 300px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.log-entries::-webkit-scrollbar {
  width: 6px;
}

.log-entries::-webkit-scrollbar-track {
  background: transparent;
}

.log-entries::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

.log-entry {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--bg-input);
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  animation: slideIn 0.3s ease;
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(-8px); }
  to { opacity: 1; transform: translateX(0); }
}

.log-entry .log-status {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}

.log-entry .log-status.sent {
  background: var(--success);
}

.log-entry .log-status.failed {
  background: var(--error);
}

.log-entry .log-recipient {
  color: var(--text-primary);
  font-weight: 500;
  flex: 1;
}

.log-entry .log-message {
  color: var(--text-muted);
  font-size: 0.78rem;
}

.log-entry .log-time {
  color: var(--text-muted);
  font-size: 0.75rem;
  font-family: var(--font-mono);
}

/* ============================================================
   PROGRESS BAR
   ============================================================ */
.progress-container {
  display: none;
  margin-top: 16px;
}

.progress-container.visible {
  display: block;
}

.progress-bar-wrapper {
  height: 6px;
  background: var(--bg-input);
  border-radius: 3px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent) 0%, #8b5cf6 100%);
  border-radius: 3px;
  transition: width 0.3s ease;
  width: 0%;
}

.progress-text {
  display: flex;
  justify-content: space-between;
  margin-top: 6px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ============================================================
   TOAST NOTIFICATIONS
   ============================================================ */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column-reverse;
  gap: 8px;
}

.toast {
  padding: 14px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: 0.85rem;
  max-width: 400px;
  display: flex;
  align-items: center;
  gap: 10px;
  animation: toastIn 0.3s ease;
}

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

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

@keyframes toastIn {
  from { opacity: 0; transform: translateY(20px) scale(0.95); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes toastOut {
  from { opacity: 1; transform: translateY(0) scale(1); }
  to { opacity: 0; transform: translateY(20px) scale(0.95); }
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
  .app-container {
    padding: 16px;
  }

  .app-header {
    flex-direction: column;
    gap: 16px;
    align-items: flex-start;
  }

  .tabs-nav {
    width: 100%;
    overflow-x: auto;
  }

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

  .form-row {
    grid-template-columns: 1fr;
  }

  .send-actions {
    flex-direction: column;
    gap: 14px;
    text-align: center;
  }

  .connection-card {
    position: static;
  }
}