/* ============================================================================
   D4RK BUDGETING PLATFORM — MODERN WEB CSS
   Applies Modern Web Guidance:
   - dark-mode (color-scheme: light dark, light-dark(), @media fallback)
   - customize-scrollbar-color-and-thickness (scrollbar-color, scrollbar-width, @supports fallback)
   - prevent-page-scroll-under-modal-dialog (overscroll-behavior: contain on dialog:modal & ::backdrop)
   - responsive-table (@container (width < 600px) with accessible ::before content slash syntax)
   - validate-input-after-interaction (:user-invalid, :user-valid, :has() rules highlight)
   ============================================================================ */

:root {
  /* Raw Light / Dark palette tokens */
  --bg-canvas-light: #f4f6fb;
  --bg-canvas-dark: #090b10;

  --bg-surface-light: #ffffff;
  --bg-surface-dark: #111520;

  --bg-elevated-light: #eef2ff;
  --bg-elevated-dark: #181e2e;

  --text-primary-light: #0f172a;
  --text-primary-dark: #f1f5f9;

  --text-muted-light: #475569;
  --text-muted-dark: #94a3b8;

  --border-subtle-light: #e2e8f0;
  --border-subtle-dark: #1e293b;

  --brand-primary-light: #4f46e5;
  --brand-primary-dark: #818cf8;

  --brand-accent-light: #0d9488;
  --brand-accent-dark: #2dd4bf;

  --danger-light: #dc2626;
  --danger-dark: #f87171;

  --danger-bg-light: #fef2f2;
  --danger-bg-dark: #2d1215;

  --success-light: #15803d;
  --success-dark: #4ade80;

  --warning-light: #d97706;
  --warning-dark: #fbbf24;

  --scrollbar-thumb-light: #94a3b8;
  --scrollbar-thumb-dark: #334155;
  --scrollbar-track-light: #e2e8f0;
  --scrollbar-track-dark: #0f172a;

  /* Default fallback assignments (Light) */
  --bg-canvas: var(--bg-canvas-light);
  --bg-surface: var(--bg-surface-light);
  --bg-elevated: var(--bg-elevated-light);
  --text-primary: var(--text-primary-light);
  --text-muted: var(--text-muted-light);
  --border-subtle: var(--border-subtle-light);
  --brand-primary: var(--brand-primary-light);
  --brand-accent: var(--brand-accent-light);
  --danger: var(--danger-light);
  --danger-bg: var(--danger-bg-light);
  --success: var(--success-light);
  --warning: var(--warning-light);
  --scrollbar-thumb: var(--scrollbar-thumb-light);
  --scrollbar-track: var(--scrollbar-track-light);

  /* MANDATORY fallback for browsers without light-dark() support */
  @media (prefers-color-scheme: dark) {
    --bg-canvas: var(--bg-canvas-dark);
    --bg-surface: var(--bg-surface-dark);
    --bg-elevated: var(--bg-elevated-dark);
    --text-primary: var(--text-primary-dark);
    --text-muted: var(--text-muted-dark);
    --border-subtle: var(--border-subtle-dark);
    --brand-primary: var(--brand-primary-dark);
    --brand-accent: var(--brand-accent-dark);
    --danger: var(--danger-dark);
    --danger-bg: var(--danger-bg-dark);
    --success: var(--success-dark);
    --warning: var(--warning-dark);
    --scrollbar-thumb: var(--scrollbar-thumb-dark);
    --scrollbar-track: var(--scrollbar-track-dark);
  }

  /* Modern light-dark() automatic adaptation */
  @supports (color: light-dark(white, black)) {
    --bg-canvas: light-dark(var(--bg-canvas-light), var(--bg-canvas-dark));
    --bg-surface: light-dark(var(--bg-surface-light), var(--bg-surface-dark));
    --bg-elevated: light-dark(var(--bg-elevated-light), var(--bg-elevated-dark));
    --text-primary: light-dark(var(--text-primary-light), var(--text-primary-dark));
    --text-muted: light-dark(var(--text-muted-light), var(--text-muted-dark));
    --border-subtle: light-dark(var(--border-subtle-light), var(--border-subtle-dark));
    --brand-primary: light-dark(var(--brand-primary-light), var(--brand-primary-dark));
    --brand-accent: light-dark(var(--brand-accent-light), var(--brand-accent-dark));
    --danger: light-dark(var(--danger-light), var(--danger-dark));
    --danger-bg: light-dark(var(--danger-bg-light), var(--danger-bg-dark));
    --success: light-dark(var(--success-light), var(--success-dark));
    --warning: light-dark(var(--warning-light), var(--warning-dark));
    --scrollbar-thumb: light-dark(var(--scrollbar-thumb-light), var(--scrollbar-thumb-dark));
    --scrollbar-track: light-dark(var(--scrollbar-track-light), var(--scrollbar-track-dark));
  }

  /* MANDATORY: Apply color-scheme to :root for viewport-wide theming */
  color-scheme: light dark;
  accent-color: var(--brand-primary);
  scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
  scrollbar-width: thin;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg-canvas: var(--bg-canvas-dark);
  --bg-surface: var(--bg-surface-dark);
  --bg-elevated: var(--bg-elevated-dark);
  --text-primary: var(--text-primary-dark);
  --text-muted: var(--text-muted-dark);
  --border-subtle: var(--border-subtle-dark);
  --brand-primary: var(--brand-primary-dark);
  --brand-accent: var(--brand-accent-dark);
  --danger: var(--danger-dark);
  --danger-bg: var(--danger-bg-dark);
  --success: var(--success-dark);
  --warning: var(--warning-dark);
  --scrollbar-thumb: var(--scrollbar-thumb-dark);
  --scrollbar-track: var(--scrollbar-track-dark);
}

html[data-theme="light"] {
  color-scheme: light;
  --bg-canvas: var(--bg-canvas-light);
  --bg-surface: var(--bg-surface-light);
  --bg-elevated: var(--bg-elevated-light);
  --text-primary: var(--text-primary-light);
  --text-muted: var(--text-muted-light);
  --border-subtle: var(--border-subtle-light);
  --brand-primary: var(--brand-primary-light);
  --brand-accent: var(--brand-accent-light);
  --danger: var(--danger-light);
  --danger-bg: var(--danger-bg-light);
  --success: var(--success-light);
  --warning: var(--warning-light);
  --scrollbar-thumb: var(--scrollbar-thumb-light);
  --scrollbar-track: var(--scrollbar-track-light);
}

/* Scrollbar customization on scrollable containers */
.scroller,
.table-wrapper,
.chat-messages {
  scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
  scrollbar-width: thin;
}

/* Legacy fallback for WebKit/Blink browsers that do not support scrollbar-color */
@supports not (scrollbar-color: auto) {
  .scroller::-webkit-scrollbar,
  .table-wrapper::-webkit-scrollbar,
  .chat-messages::-webkit-scrollbar {
    width: 10px;
    height: 10px;
  }
  .scroller::-webkit-scrollbar-thumb,
  .table-wrapper::-webkit-scrollbar-thumb,
  .chat-messages::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
  }
  .scroller::-webkit-scrollbar-track,
  .table-wrapper::-webkit-scrollbar-track,
  .chat-messages::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100dvh;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================================================
   MODAL DIALOGS (light-dismiss-a-dialog + prevent-page-scroll-under-modal-dialog)
   ============================================================================ */
dialog {
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 1.5rem;
  max-width: 560px;
  width: calc(100% - 2rem);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

dialog:modal {
  /* MANDATORY: Prevent scroll gestures inside the modal from chaining to the underlying page */
  overscroll-behavior: contain;
}

dialog::backdrop {
  /* MANDATORY: Set overflow: hidden so ::backdrop becomes a non-scrollable scroll container
     that honors overscroll-behavior: contain */
  overflow: hidden;
  overscroll-behavior: contain;
  background-color: rgba(5, 8, 18, 0.72);
  backdrop-filter: blur(4px);
}

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

.dialog-header h2 {
  margin: 0;
  font-size: 1.2rem;
}

/* ============================================================================
   AUTH VIEW & VALIDATION (:user-invalid, :user-valid, :has())
   ============================================================================ */
.auth-screen {
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  background:
    radial-gradient(circle at 15% 20%, rgba(99, 102, 241, 0.16), transparent 40%),
    radial-gradient(circle at 85% 80%, rgba(20, 184, 166, 0.14), transparent 40%),
    var(--bg-canvas);
}

.auth-container {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  max-width: 1040px;
  width: 100%;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 24px;
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
}

@media (max-width: 860px) {
  .auth-container {
    grid-template-columns: 1fr;
  }
}

.auth-hero {
  padding: 2.5rem;
  background: linear-gradient(145deg, #131829 0%, #0b0f19 100%);
  color: #f8fafc;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border-right: 1px solid rgba(255, 255, 255, 0.08);
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}

.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, #6366f1, #14b8a6);
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 900;
  font-size: 1.1rem;
  box-shadow: 0 8px 20px rgba(99, 102, 241, 0.35);
}

.auth-feature-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0;
  display: grid;
  gap: 1rem;
}

.auth-feature-list li {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  font-size: 0.92rem;
  color: #cbd5e1;
}

.auth-panel {
  padding: 2.25rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.auth-tabs {
  display: flex;
  gap: 0.5rem;
  background: var(--bg-elevated);
  padding: 0.35rem;
  border-radius: 12px;
  margin-bottom: 1.25rem;
}

.auth-tab {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--text-muted);
  padding: 0.6rem 1rem;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
}

.auth-tab.active {
  background: var(--bg-surface);
  color: var(--text-primary);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
}

.field {
  margin-bottom: 1rem;
}

.field label {
  display: block;
  font-weight: 600;
  font-size: 0.88rem;
  margin-bottom: 0.25rem;
}

.hint {
  display: block;
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-bottom: 0.3rem;
}

.rules-list {
  color: var(--text-muted);
  font-size: 0.78rem;
  margin: 0.2rem 0 0.45rem;
  padding-left: 1.2rem;
}

.password-row {
  position: relative;
  display: flex;
  align-items: center;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="date"],
input[type="search"],
select,
textarea {
  width: 100%;
  padding: 0.68rem 0.85rem;
  border-radius: 10px;
  border: 1.5px solid var(--border-subtle);
  background: var(--bg-canvas);
  color: var(--text-primary);
  font-size: 0.94rem;
  font-family: inherit;
  transition: border-color 0.15s ease;
}

input:focus,
select:focus,
textarea:focus {
  outline: 2px solid var(--brand-primary);
  outline-offset: 1px;
}

.password-toggle-btn {
  position: absolute;
  right: 0.5rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  border-radius: 6px;
  padding: 0.25rem 0.55rem;
  font-size: 0.76rem;
  font-weight: 600;
  cursor: pointer;
}

.error-msg {
  display: none;
  color: var(--danger);
  font-size: 0.82rem;
  margin-top: 0.3rem;
  font-weight: 500;
}

/* Validate Input After Interaction (:user-invalid & :user-valid + WeakMap fallback) */
input:user-invalid,
input.user-invalid-fallback {
  border-color: var(--danger);
  background-color: var(--danger-bg);
}

input:user-invalid + .error-msg,
input.user-invalid-fallback + .error-msg,
.password-row:has(input:user-invalid) + .error-msg,
.password-row:has(input.user-invalid-fallback) + .error-msg {
  display: block;
}

input:user-valid,
input.user-valid-fallback {
  border-color: var(--success);
}

/* Highlight rules list when error is shown using :has() */
.field:has(input:user-invalid) .rules-list,
.field:has(input.user-invalid-fallback) .rules-list {
  color: var(--danger);
  font-weight: 600;
}

/* Hide rules once satisfied */
.field:has(input:user-valid) .rules-list,
.field:has(input.user-valid-fallback) .rules-list {
  display: none;
}

/* ============================================================================
   APP SHELL & DASHBOARD LAYOUT
   ============================================================================ */
.app-shell {
  display: grid;
  grid-template-columns: 260px 1fr;
  min-height: 100dvh;
}

@media (max-width: 980px) {
  .app-shell {
    grid-template-columns: 1fr;
  }
}

.sidebar {
  background: var(--bg-surface);
  border-right: 1px solid var(--border-subtle);
  padding: 1.35rem 1rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: sticky;
  top: 0;
  height: 100dvh;
}

@media (max-width: 980px) {
  .sidebar {
    position: static;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border-subtle);
  }
}

.nav-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

@media (max-width: 980px) {
  .nav-list {
    flex-direction: row;
    flex-wrap: wrap;
    margin: 0.75rem 0;
  }
}

.nav-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.7rem 0.9rem;
  border-radius: 10px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.92rem;
  text-align: left;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

@media (max-width: 980px) {
  .nav-btn {
    width: auto;
  }
}

.nav-btn:hover {
  background: var(--bg-elevated);
  color: var(--text-primary);
}

.nav-btn.active {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.18), rgba(20, 184, 166, 0.14));
  color: var(--brand-primary);
  border: 1px solid rgba(99, 102, 241, 0.3);
}

.main-area {
  padding: 1.5rem 2rem 4rem;
  max-width: 1440px;
  width: 100%;
  margin: 0 auto;
}

@media (max-width: 680px) {
  .main-area {
    padding: 1rem;
  }
}

.topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-subtle);
}

.topbar-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.6rem 1.05rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.88rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.1s ease, opacity 0.15s ease;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: linear-gradient(135deg, #4f46e5, #6366f1);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(79, 70, 229, 0.35);
}

.btn-accent {
  background: linear-gradient(135deg, #0d9488, #14b8a6);
  color: #ffffff;
}

.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border-color: var(--border-subtle);
}

.btn-danger {
  background: rgba(239, 68, 68, 0.14);
  color: var(--danger);
  border-color: rgba(239, 68, 68, 0.3);
}

.btn-sm {
  padding: 0.4rem 0.75rem;
  font-size: 0.8rem;
}

/* KPI Grid */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 1.25rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.kpi-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.kpi-value {
  font-size: 1.75rem;
  font-weight: 800;
  margin: 0.35rem 0;
  letter-spacing: -0.02em;
}

.kpi-sub {
  font-size: 0.82rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

@media (max-width: 500px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.section-header h3 {
  margin: 0;
  font-size: 1.05rem;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-ai {
  background: rgba(99, 102, 241, 0.16);
  color: var(--brand-primary);
  border: 1px solid rgba(99, 102, 241, 0.3);
}

.badge-high {
  background: rgba(239, 68, 68, 0.15);
  color: var(--danger);
}

.badge-medium {
  background: rgba(245, 158, 11, 0.16);
  color: var(--warning);
}

.badge-good {
  background: rgba(34, 197, 94, 0.15);
  color: var(--success);
}

/* Progress Bars */
.progress-track {
  width: 100%;
  height: 8px;
  background: var(--bg-elevated);
  border-radius: 999px;
  overflow: hidden;
  margin: 0.4rem 0;
}

.progress-fill {
  height: 100%;
  border-radius: 999px;
  transition: width 0.3s ease;
}

/* ============================================================================
   RESPONSIVE TABLE (Modern Web Guidance: responsive-table)
   ============================================================================ */
.table-wrapper {
  overflow: auto;
  max-inline-size: 100%;
  max-block-size: min(560px, 78vh);
  container-type: inline-size;
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  background: var(--bg-surface);
}

table.tx-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 0.9rem;
  --label-1: "Merchant";
  --label-2: "Date";
  --label-3: "Account";
  --label-4: "Category";
  --label-5: "AI Status";
  --label-6: "Amount";
}

table.tx-table thead {
  position: sticky;
  inset-block-start: 0;
  z-index: 2;
  background: var(--bg-elevated);
}

table.tx-table th,
table.tx-table td {
  padding: 0.8rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-subtle);
}

table.tx-table tbody th {
  position: sticky;
  inset-inline-start: 0;
  background: var(--bg-surface);
  font-weight: 600;
  z-index: 1;
}

@container (width < 600px) {
  table.tx-table,
  table.tx-table thead,
  table.tx-table tbody,
  table.tx-table tr,
  table.tx-table th,
  table.tx-table td {
    display: block;
  }

  table.tx-table thead {
    /* MANDATORY: Hide column header from layout and screen readers */
    display: none;
  }

  table.tx-table tr {
    margin-block-end: 1rem;
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    overflow: hidden;
  }

  table.tx-table tbody th {
    position: sticky;
    inset-block-start: 0;
    z-index: 2;
    background: var(--bg-elevated);
  }

  table.tx-table td:nth-child(2)::before {
    content: var(--label-2) ": " / var(--label-2);
    font-weight: 600;
    color: var(--text-muted);
  }
  table.tx-table td:nth-child(3)::before {
    content: var(--label-3) ": " / var(--label-3);
    font-weight: 600;
    color: var(--text-muted);
  }
  table.tx-table td:nth-child(4)::before {
    content: var(--label-4) ": " / var(--label-4);
    font-weight: 600;
    color: var(--text-muted);
  }
  table.tx-table td:nth-child(5)::before {
    content: var(--label-5) ": " / var(--label-5);
    font-weight: 600;
    color: var(--text-muted);
  }
  table.tx-table td:nth-child(6)::before {
    content: var(--label-6) ": " / var(--label-6);
    font-weight: 600;
    color: var(--text-muted);
  }
}

/* ============================================================================
   SAVINGS INSIGHT CARDS & AI ADVISOR CHAT
   ============================================================================ */
.insight-card {
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  padding: 1.15rem;
  background: var(--bg-canvas);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.insight-savings-pill {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--success);
}

.chat-panel {
  display: flex;
  flex-direction: column;
  height: 480px;
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  overflow: hidden;
  background: var(--bg-canvas);
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.chat-bubble {
  max-width: 85%;
  padding: 0.75rem 1rem;
  border-radius: 14px;
  font-size: 0.9rem;
  line-height: 1.45;
  white-space: pre-wrap;
}

.chat-bubble.user {
  align-self: flex-end;
  background: var(--brand-primary);
  color: #ffffff;
}

.chat-bubble.assistant {
  align-self: flex-start;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
}

.chat-input-bar {
  display: flex;
  gap: 0.6rem;
  padding: 0.75rem;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
}

.chat-input-bar textarea {
  resize: none;
  height: 44px;
}

/* ============================================================================
   INTERACTIVE MOBILE APP SIMULATOR PREVIEW
   ============================================================================ */
.mobile-preview-layout {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 2rem;
  align-items: start;
}

@media (max-width: 900px) {
  .mobile-preview-layout {
    grid-template-columns: 1fr;
  }
}

.phone-frame {
  width: 360px;
  height: 720px;
  margin: 0 auto;
  border: 10px solid #1e293b;
  border-radius: 44px;
  background: #090b10;
  color: #f8fafc;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.5);
  position: relative;
}

.phone-notch {
  width: 120px;
  height: 22px;
  background: #1e293b;
  border-radius: 0 0 14px 14px;
  margin: 0 auto;
}

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

.phone-tabbar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: #111520;
  border-top: 1px solid #1e293b;
  padding: 0.5rem 0.25rem;
}

.phone-tabbar button {
  background: transparent;
  border: none;
  color: #94a3b8;
  font-size: 0.7rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  cursor: pointer;
}

.phone-tabbar button.active {
  color: #818cf8;
  font-weight: 700;
}

.toast-banner {
  position: fixed;
  bottom: 1.25rem;
  right: 1.25rem;
  z-index: 999;
  padding: 0.85rem 1.2rem;
  border-radius: 12px;
  background: #1e293b;
  color: #f8fafc;
  border: 1px solid #334155;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
  font-size: 0.9rem;
  font-weight: 600;
}