/* ===========================================
   46elks SMS — Claude Design System
   Clean, minimal, modern messaging UI
   =========================================== */

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

:root {
  --bg: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-sidebar: #111111;
  --bg-sidebar-hover: rgba(255, 255, 255, 0.06);
  --bg-sidebar-active: rgba(255, 255, 255, 0.1);
  --fg: #030213;
  --fg-muted: #717182;
  --fg-faint: #a1a1aa;
  --fg-sidebar: rgba(255, 255, 255, 0.88);
  --fg-sidebar-muted: rgba(255, 255, 255, 0.45);
  --border: rgba(0, 0, 0, 0.1);
  --border-light: rgba(0, 0, 0, 0.06);
  --primary: #030213;
  --primary-fg: #ffffff;
  --accent: #6366f1;
  --accent-light: #eef2ff;
  --destructive: #ef4444;
  --success: #22c55e;
  --warning: #f59e0b;
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  font-size: 14px;
  font-weight: 400;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.text-muted { color: var(--fg-muted); }
.text-sm { font-size: 12px; }

/* ===================== Layout ===================== */

.app {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* ===================== Sidebar ===================== */

.sidebar {
  width: 320px;
  min-width: 320px;
  background: var(--bg-sidebar);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 16px 12px;
}

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

.logo {
  font-size: 16px;
  font-weight: 600;
  color: var(--fg-sidebar);
  letter-spacing: -0.02em;
}

.sidebar-search {
  position: relative;
  padding: 0 12px 12px;
}

.search-icon {
  position: absolute;
  left: 22px;
  top: 50%;
  transform: translateY(calc(-50% - 6px));
  color: var(--fg-sidebar-muted);
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: 8px 12px 8px 36px;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius);
  color: var(--fg-sidebar);
  font-family: var(--font);
  font-size: 13px;
  outline: none;
  transition: all 0.2s var(--ease);
}

.search-input::placeholder {
  color: var(--fg-sidebar-muted);
}

.search-input:focus {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.15);
}

.conversation-list {
  flex: 1;
  overflow-y: auto;
  padding: 0 8px 8px;
}

.conversation-list::-webkit-scrollbar { width: 4px; }
.conversation-list::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
}

.conversation-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 12px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.15s var(--ease);
}

.conversation-item:hover {
  background: var(--bg-sidebar-hover);
}

.conversation-item.active {
  background: var(--bg-sidebar-active);
}

.conversation-item .conv-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.conversation-item.unread .conv-phone {
  font-weight: 600;
}

.conversation-item.unread .conv-preview {
  color: var(--fg-sidebar);
  font-weight: 500;
}

.unread-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #ef4444;
  flex-shrink: 0;
  margin-right: 2px;
}

.conversation-item .conv-phone {
  font-size: 13px;
  font-weight: 500;
  color: var(--fg-sidebar);
}

.conversation-item .conv-time {
  font-size: 11px;
  color: var(--fg-sidebar-muted);
}

.conversation-item .conv-preview {
  font-size: 12px;
  color: var(--fg-sidebar-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.conversation-item .conv-count {
  font-size: 10px;
  font-weight: 500;
  color: var(--fg-sidebar-muted);
  background: rgba(255, 255, 255, 0.08);
  padding: 1px 6px;
  border-radius: var(--radius-full);
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  text-align: center;
  color: var(--fg-sidebar-muted);
  font-size: 13px;
  padding: 48px 20px;
}

/* ===================== Buttons ===================== */

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 500;
  padding: 10px 20px;
  background: var(--primary);
  color: var(--primary-fg);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: opacity 0.15s var(--ease);
}

.sidebar .btn-primary.btn-icon-round {
  background: rgba(255, 255, 255, 0.12);
  color: #ffffff;
}

.sidebar .btn-primary.btn-icon-round svg {
  stroke: #ffffff;
}

.sidebar .btn-primary.btn-icon-round:hover {
  background: rgba(255, 255, 255, 0.2);
}

.btn-primary:hover { opacity: 0.85; }
.btn-primary:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  color: var(--fg-sidebar-muted);
  cursor: pointer;
  transition: color 0.15s var(--ease);
}

.btn-ghost:hover { color: var(--fg-sidebar); }

.main .btn-ghost {
  color: var(--fg-muted);
}
.main .btn-ghost:hover {
  color: var(--fg);
}

.btn-icon-round {
  width: 34px;
  height: 34px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
}

.sidebar .btn-icon-round:hover {
  background: var(--bg-sidebar-hover);
}

.main .btn-icon-round:hover {
  background: var(--bg-secondary);
}

.btn-full { width: 100%; }
.btn-sm { padding: 8px 14px; font-size: 13px; }

.btn-back { display: none; }

.btn-send {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--primary);
  color: var(--primary-fg);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: opacity 0.15s var(--ease);
  flex-shrink: 0;
}

.btn-send:hover { opacity: 0.85; }

/* ===================== Main area ===================== */

.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  position: relative;
}

/* ===================== Compose ===================== */

.compose-view {
  flex: 1;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 48px 24px;
  overflow-y: auto;
}

.compose-view.hidden,
.conversation-view.hidden,
.empty-main.hidden {
  display: none;
}

.compose-card {
  width: 100%;
  max-width: 480px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.compose-card-header {
  padding: 24px 24px 0;
}

.compose-card-header h2 {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--fg);
  margin-bottom: 4px;
}

.compose-card-header .text-muted {
  font-size: 13px;
}

.compose-form {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* ===================== Form elements ===================== */

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 13px;
  font-weight: 500;
  color: var(--fg);
}

.form-control {
  font-family: var(--font);
  font-size: 14px;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--fg);
  outline: none;
  transition: border-color 0.15s var(--ease), box-shadow 0.15s var(--ease);
}

.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(3, 2, 19, 0.06);
}

.form-control.error {
  border-color: var(--destructive);
}

.form-control::placeholder {
  color: var(--fg-faint);
}

select.form-control {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1.5 1.75L6 6.25L10.5 1.75' stroke='%23717182' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 34px;
}

.input-group {
  display: flex;
  align-items: stretch;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  overflow: hidden;
  transition: border-color 0.15s var(--ease), box-shadow 0.15s var(--ease);
}

.input-group:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(3, 2, 19, 0.06);
}

.input-group.error {
  border-color: var(--destructive);
}

.input-group-prefix {
  display: flex;
  align-items: center;
  padding: 0 0 0 12px;
  font-size: 14px;
  font-weight: 500;
  color: var(--fg-muted);
  user-select: none;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-light);
  padding-right: 10px;
}

.input-group-field {
  border: none;
  border-radius: 0;
  flex: 1;
  padding-left: 10px;
  background: transparent;
}

.input-group-field:focus {
  box-shadow: none;
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
  line-height: 1.6;
}

.form-hint {
  font-size: 12px;
  color: var(--fg-muted);
}

.form-error {
  color: var(--destructive);
  min-height: 16px;
}

.form-warning {
  color: var(--warning);
}

.form-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* ===================== Conversation ===================== */

.conversation-view {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.conversation-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-light);
  background: var(--bg);
}

.conversation-header-info {
  flex: 1;
  min-width: 0;
}

.conversation-header-info h2 {
  font-size: 15px;
  font-weight: 600;
  color: var(--fg);
  letter-spacing: -0.01em;
}

/* ===================== Messages ===================== */

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--bg-secondary);
}

.messages::-webkit-scrollbar { width: 4px; }
.messages::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.1);
  border-radius: 4px;
}

.message-row {
  display: flex;
  flex-direction: column;
  max-width: 72%;
}

.message-row.outgoing {
  align-self: flex-end;
  align-items: flex-end;
}

.message-row.incoming {
  align-self: flex-start;
  align-items: flex-start;
}

.message-bubble {
  padding: 10px 14px;
  font-size: 14px;
  line-height: 1.5;
  word-break: break-word;
  white-space: pre-wrap;
}

.message-row.outgoing .message-bubble {
  background: var(--primary);
  color: var(--primary-fg);
  border-radius: var(--radius-xl) var(--radius-xl) 6px var(--radius-xl);
}

.message-row.incoming .message-bubble {
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl) var(--radius-xl) var(--radius-xl) 6px;
}

.message-footer {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 3px 4px 0;
}

.message-time {
  font-size: 11px;
  color: var(--fg-faint);
}

.message-status {
  font-size: 11px;
  color: var(--fg-faint);
}

.message-status.delivered {
  color: var(--success);
}

/* ===================== Reply bar ===================== */

.reply-bar {
  border-top: 1px solid var(--border-light);
  background: var(--bg);
  padding: 12px 16px;
}

.reply-form {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.reply-input-wrap {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 4px 4px 4px 16px;
  transition: border-color 0.15s var(--ease);
}

.reply-input-wrap:focus-within {
  border-color: var(--primary);
}

.reply-input {
  flex: 1;
  border: none;
  background: transparent;
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.5;
  color: var(--fg);
  outline: none;
  resize: none;
  padding: 6px 0;
  max-height: 120px;
}

.reply-input::placeholder {
  color: var(--fg-faint);
}

.reply-meta {
  padding: 0 4px;
}

/* ===================== Empty state ===================== */

.empty-main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
}

.empty-main-content {
  text-align: center;
}

.empty-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border-radius: var(--radius-full);
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--fg-faint);
  margin-bottom: 16px;
}

.empty-main-content h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 4px;
}

.empty-main-content p {
  font-size: 13px;
}

/* ===================== Send button & schedule popup ===================== */

.send-btn-wrap {
  position: relative;
}

.schedule-popup {
  position: absolute;
  bottom: 100%;
  right: 0;
  margin-bottom: 8px;
  width: 260px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 16px;
  z-index: 50;
}
.schedule-popup.hidden {
  display: none;
}

.schedule-popup-header {
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 10px;
}

.schedule-popup input[type="datetime-local"] {
  margin-bottom: 10px;
  font-size: 13px;
}

.schedule-cancel-on-reply {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--fg-muted);
  cursor: pointer;
  margin-bottom: 12px;
  user-select: none;
}

.schedule-cancel-on-reply input {
  width: 15px;
  height: 15px;
  accent-color: var(--primary);
}

.reply-schedule-banner {
  padding: 8px 16px;
  background: var(--accent-light);
  border-bottom: 1px solid var(--border-light);
  font-size: 12px;
  color: var(--fg-muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.reply-schedule-banner.hidden { display: none; }

.reply-schedule-banner button {
  font-family: var(--font);
  font-size: 12px;
  font-weight: 500;
  color: var(--destructive);
  background: none;
  border: none;
  cursor: pointer;
  padding: 2px 6px;
}

/* ===================== Scheduling ===================== */

.schedule-toggle-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--fg-muted);
  cursor: pointer;
  user-select: none;
}

.schedule-toggle-label input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--primary);
}

.schedule-picker {
  margin-top: 8px;
}

.schedule-picker input[type="datetime-local"] {
  width: 100%;
}

.scheduled-list {
  max-width: 480px;
  margin: 24px auto 0;
}

.scheduled-list h3 {
  font-size: 13px;
  font-weight: 600;
  color: var(--fg-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}

.scheduled-item {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-bottom: 8px;
}

.scheduled-item-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

.scheduled-item-to {
  font-size: 13px;
  font-weight: 600;
  color: var(--fg);
}

.scheduled-item-time {
  font-size: 12px;
  color: var(--fg-muted);
}

.scheduled-item-message {
  font-size: 13px;
  color: var(--fg-muted);
  line-height: 1.4;
  margin-bottom: 10px;
  white-space: pre-wrap;
}

.scheduled-item-actions {
  display: flex;
  gap: 8px;
}

.scheduled-item-actions button {
  font-family: var(--font);
  font-size: 12px;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg-muted);
  cursor: pointer;
  transition: all 0.15s;
}

.scheduled-item-actions button:hover {
  background: var(--bg-secondary);
  color: var(--fg);
}

.scheduled-item-actions .btn-delete-scheduled:hover {
  color: var(--destructive);
  border-color: var(--destructive);
}

.scheduled-edit-time {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
}

.scheduled-edit-time input {
  flex: 1;
  font-size: 13px;
}

/* ===================== Settings ===================== */

.settings-view {
  flex: 1;
  overflow-y: auto;
  padding: 40px 24px;
  background: var(--bg-secondary);
}

.settings-card {
  max-width: 520px;
  margin: 0 auto;
}

.settings-header {
  margin-bottom: 32px;
}

.settings-header h2 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}

.settings-section {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 16px;
}

.settings-section h3 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 4px;
}

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

.toggle {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 22px;
  flex-shrink: 0;
}

.toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background: var(--border);
  border-radius: 11px;
  transition: background 0.2s;
}

.toggle-slider::before {
  content: '';
  position: absolute;
  height: 16px;
  width: 16px;
  left: 3px;
  bottom: 3px;
  background: white;
  border-radius: 50%;
  transition: transform 0.2s;
}

.toggle input:checked + .toggle-slider {
  background: var(--success);
}

.toggle input:checked + .toggle-slider::before {
  transform: translateX(18px);
}

.forwarding-numbers {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.forwarding-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.forwarding-row .input-group {
  flex: 1;
}

.btn-remove-number {
  width: 32px;
  height: 32px;
  border: none;
  background: none;
  color: var(--fg-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  transition: color 0.15s, background 0.15s;
}

.btn-remove-number:hover {
  color: var(--destructive);
  background: rgba(239, 68, 68, 0.1);
}

.btn-add-number {
  margin-top: 8px;
  font-size: 13px;
  color: var(--fg-muted);
  padding: 6px 0;
}

.btn-add-number:hover {
  color: var(--fg);
}

.settings-status {
  margin-top: 12px;
  font-size: 13px;
  color: var(--fg-muted);
  min-height: 20px;
}

.settings-status.success { color: var(--success); }
.settings-status.error { color: var(--destructive); }

.number-info {
  margin-top: 8px;
  font-size: 13px;
  color: var(--fg-muted);
  line-height: 1.6;
}

.number-info .info-row {
  display: flex;
  justify-content: space-between;
  padding: 4px 0;
  border-bottom: 1px solid var(--border-light);
}

.number-info .info-label {
  color: var(--fg-muted);
}

.number-info .info-value {
  color: var(--fg);
  font-weight: 500;
}

/* ===================== Toast ===================== */

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px 20px;
  border-radius: var(--radius-full);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 500;
  color: #fff;
  background: var(--fg);
  box-shadow: var(--shadow-md);
  z-index: 100;
  transition: opacity 0.25s var(--ease), transform 0.25s var(--ease);
}

.toast.hidden {
  opacity: 0;
  transform: translateX(-50%) translateY(8px);
  pointer-events: none;
}

.toast.error { background: var(--destructive); }
.toast.success { background: var(--fg); }

/* ===================== Dark mode ===================== */

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0a0a0a;
    --bg-secondary: #111111;
    --bg-sidebar: #000000;
    --bg-sidebar-hover: rgba(255, 255, 255, 0.06);
    --bg-sidebar-active: rgba(255, 255, 255, 0.1);
    --fg: #ececf0;
    --fg-muted: #8e8ea0;
    --fg-faint: #5a5a6e;
    --fg-sidebar: rgba(255, 255, 255, 0.88);
    --fg-sidebar-muted: rgba(255, 255, 255, 0.4);
    --border: rgba(255, 255, 255, 0.1);
    --border-light: rgba(255, 255, 255, 0.06);
    --primary: #ececf0;
    --primary-fg: #0a0a0a;
    --accent: #818cf8;
    --accent-light: rgba(129, 140, 248, 0.1);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4), 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  }

  .search-input {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.06);
  }

  .search-input:focus {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.12);
  }

  .form-control:focus {
    box-shadow: 0 0 0 3px rgba(236, 236, 240, 0.08);
  }

  .input-group:focus-within {
    box-shadow: 0 0 0 3px rgba(236, 236, 240, 0.08);
  }

  .input-group-prefix {
    background: rgba(255, 255, 255, 0.04);
    border-right-color: rgba(255, 255, 255, 0.06);
  }

  select.form-control {
    background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1.5 1.75L6 6.25L10.5 1.75' stroke='%238e8ea0' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  }

  .message-row.outgoing .message-bubble {
    background: var(--primary);
    color: var(--primary-fg);
  }

  .message-row.incoming .message-bubble {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.08);
  }

  .reply-input-wrap {
    background: rgba(255, 255, 255, 0.04);
  }

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

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

  .messages::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.08);
  }

  .toast {
    background: var(--fg);
    color: var(--bg);
  }

  .toast.success {
    background: var(--fg);
    color: var(--bg);
  }
}

/* Explicit dark mode via toggle */
:root[data-theme="dark"] {
  --bg: #0a0a0a;
  --bg-secondary: #111111;
  --bg-sidebar: #000000;
  --bg-sidebar-hover: rgba(255, 255, 255, 0.06);
  --bg-sidebar-active: rgba(255, 255, 255, 0.1);
  --fg: #ececf0;
  --fg-muted: #8e8ea0;
  --fg-faint: #5a5a6e;
  --fg-sidebar: rgba(255, 255, 255, 0.88);
  --fg-sidebar-muted: rgba(255, 255, 255, 0.4);
  --border: rgba(255, 255, 255, 0.1);
  --border-light: rgba(255, 255, 255, 0.06);
  --primary: #ececf0;
  --primary-fg: #0a0a0a;
  --accent: #818cf8;
  --accent-light: rgba(129, 140, 248, 0.1);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.4), 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
}

:root[data-theme="dark"] .search-input {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.06);
}
:root[data-theme="dark"] .search-input:focus {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.12);
}
:root[data-theme="dark"] .form-control:focus { box-shadow: 0 0 0 3px rgba(236, 236, 240, 0.08); }
:root[data-theme="dark"] .input-group:focus-within { box-shadow: 0 0 0 3px rgba(236, 236, 240, 0.08); }
:root[data-theme="dark"] .input-group-prefix { background: rgba(255, 255, 255, 0.04); border-right-color: rgba(255, 255, 255, 0.06); }
:root[data-theme="dark"] select.form-control { background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1.5 1.75L6 6.25L10.5 1.75' stroke='%238e8ea0' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E"); }
:root[data-theme="dark"] .message-row.outgoing .message-bubble { background: var(--primary); color: var(--primary-fg); }
:root[data-theme="dark"] .message-row.incoming .message-bubble { background: rgba(255, 255, 255, 0.06); border-color: rgba(255, 255, 255, 0.08); }
:root[data-theme="dark"] .reply-input-wrap { background: rgba(255, 255, 255, 0.04); }
:root[data-theme="dark"] .compose-card { background: var(--bg-secondary); }
:root[data-theme="dark"] .empty-icon { background: var(--bg-secondary); }
:root[data-theme="dark"] .messages::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.08); }
:root[data-theme="dark"] .toast, :root[data-theme="dark"] .toast.success { background: var(--fg); color: var(--bg); }

/* ===================== Responsive ===================== */

@media (max-width: 768px) {
  .sidebar {
    width: 100%;
    min-width: 0;
    position: absolute;
    inset: 0;
    z-index: 10;
    transition: transform 0.3s var(--ease);
  }

  .sidebar.sidebar-hidden {
    transform: translateX(-100%);
  }

  .btn-back { display: flex; }

  .compose-view { padding: 24px 16px; }
  .empty-main { display: none; }
}