/* ==========================================================================
   MB BANK DESIGN SYSTEM & STYLESHEET
   Reference: MB-Bank.md — Tin cậy, hiện đại và rõ ràng cho trải nghiệm ngân hàng số
   Brand Colors: MB Blue (#151FD0) & MB Red (#EB2D4B)
   ========================================================================== */

:root {
  /* Brand */
  --color-brand-primary: #151FD0;
  --color-brand-secondary: #EB2D4B;

  /* Primary Scale — MB Blue */
  --color-primary-50: #EEF0FF;
  --color-primary-100: #DDE0FF;
  --color-primary-200: #BEC4FF;
  --color-primary-300: #969EFF;
  --color-primary-400: #6D74FF;
  --color-primary-500: #4148F2;
  --color-primary-600: #151FD0;
  --color-primary-700: #1019AD;
  --color-primary-800: #0C148A;
  --color-primary-900: #0A116F;
  --color-primary-950: #070A3F;

  /* Secondary Scale — MB Red */
  --color-secondary-50: #FFF0F3;
  --color-secondary-100: #FFDDE4;
  --color-secondary-200: #FFC0CC;
  --color-secondary-300: #FF91A5;
  --color-secondary-400: #FA5A74;
  --color-secondary-500: #EB2D4B;
  --color-secondary-600: #CE1736;
  --color-secondary-700: #AA122C;
  --color-secondary-800: #8D1329;
  --color-secondary-900: #761528;
  --color-secondary-950: #420812;

  /* Neutrals */
  --color-neutral-0: #FFFFFF;
  --color-neutral-50: #F7F8FB;
  --color-neutral-100: #F0F1F5;
  --color-neutral-200: #E2E4EB;
  --color-neutral-300: #C9CCD7;
  --color-neutral-500: #777B8E;
  --color-neutral-600: #5E6275;
  --color-neutral-800: #292C3D;
  --color-neutral-950: #111322;

  /* Semantic Colors */
  --color-success: #14804A;
  --color-success-soft: #EAF8F0;
  --color-success-border: #9AD7B5;

  --color-warning: #B54708;
  --color-warning-soft: #FFF6E8;
  --color-warning-border: #F2C47C;

  --color-error: #C61E3A;
  --color-error-soft: #FFF0F3;
  --color-error-border: #F4A3B1;

  --color-info: #151FD0;
  --color-info-soft: #EEF0FF;
  --color-info-border: #BEC4FF;

  /* Surface Roles (Light-First Default) */
  --surface-canvas: var(--color-neutral-50);
  --surface-primary: var(--color-neutral-0);
  --surface-secondary: var(--color-neutral-100);
  --surface-brand: var(--color-primary-600);
  --surface-promo: var(--color-secondary-50);

  /* Text & Border Defaults */
  --text-primary: var(--color-neutral-950);
  --text-body: var(--color-neutral-800);
  --text-secondary: var(--color-neutral-600);
  --text-muted: var(--color-neutral-500);
  --border-default: var(--color-neutral-200);
  --border-strong: var(--color-neutral-300);

  /* Typography */
  --font-sans: "Be Vietnam Pro", Inter, "Segoe UI", Roboto, Arial, sans-serif;
  --text-caption: 12px;
  --text-body-sm: 14px;
  --text-body-size: 16px;
  --text-body-lg: 18px;
  --text-h4: 20px;
  --text-h3: 24px;
  --text-h2: 30px;
  --text-h1: 36px;
  --text-display: 48px;
  --text-amount-xl: 40px;
  --text-amount: 24px;

  /* Spacing Scale (Base: 4px) */
  --spacing-0: 0;
  --spacing-1: 4px;
  --spacing-2: 8px;
  --spacing-3: 12px;
  --spacing-4: 16px;
  --spacing-5: 20px;
  --spacing-6: 24px;
  --spacing-8: 32px;
  --spacing-10: 40px;
  --spacing-12: 48px;
  --spacing-16: 64px;
  --spacing-20: 80px;
  --spacing-24: 96px;

  /* Shape / Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Layout */
  --page-max-width: 1200px;
  --content-max-width: 760px;
  --mobile-gutter: 16px;
  --desktop-gutter: 24px;

  /* Elevation */
  --shadow-0: none;
  --shadow-1: 0 1px 2px rgba(17, 19, 34, 0.06);
  --shadow-2: 0 8px 24px rgba(17, 19, 34, 0.10);
  --shadow-3: 0 20px 48px rgba(17, 19, 34, 0.16);

  /* Motion */
  --motion-fast: 120ms ease-out;
  --motion-standard: 200ms cubic-bezier(0.2, 0, 0, 1);
  --motion-emphasized: 320ms cubic-bezier(0.2, 0, 0, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--surface-canvas);
  color: var(--text-body);
  font-size: var(--text-body-size);
  line-height: 1.5;
  min-height: 100vh;
  transition: background-color var(--motion-standard), color var(--motion-standard);
  position: relative;
  overflow-x: hidden;
}

/* Tabular Numerals for codes, amounts, UID, and question indices */
.tabular-num,
.question-number,
.uid-pill,
.progress-meta,
.rating-label,
.badge-count {
  font-variant-numeric: tabular-nums;
}

/* Ambient Subtle Background Accent */
.bg-ambient-orb {
  position: fixed;
  border-radius: var(--radius-full);
  filter: blur(100px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.12;
}
.orb-1 {
  width: 480px;
  height: 480px;
  background: var(--color-primary-400);
  top: -120px;
  right: -80px;
}
.orb-2 {
  width: 360px;
  height: 360px;
  background: var(--color-secondary-400);
  bottom: -60px;
  left: -80px;
  opacity: 0.08;
}

/* Main App Container */
.app-container {
  position: relative;
  z-index: 1;
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: var(--spacing-6) var(--desktop-gutter) var(--spacing-20);
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-4) var(--spacing-6);
  background: var(--surface-primary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-1);
  margin-bottom: var(--spacing-8);
  position: sticky;
  top: var(--spacing-4);
  z-index: 100;
  transition: background-color var(--motion-standard), border-color var(--motion-standard);
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
}

.brand-logo-container {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-neutral-0);
  padding: 4px 12px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-default);
  height: 44px;
}

.brand-logo-img {
  height: 28px;
  width: auto;
  object-fit: contain;
  display: block;
}

.brand-info h1 {
  font-size: var(--text-h4);
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  line-height: 1.25;
}

.brand-info h1 span.portal-tag {
  font-size: var(--text-caption);
  font-weight: 600;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  background: var(--color-primary-50);
  color: var(--color-primary-700);
  border: 1px solid var(--color-primary-200);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.brand-info p {
  font-size: var(--text-body-sm);
  color: var(--text-secondary);
  margin-top: 2px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
}

.uid-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-2) var(--spacing-4);
  background: var(--color-primary-50);
  border: 1px solid var(--color-primary-200);
  border-radius: var(--radius-full);
  font-size: var(--text-body-sm);
  font-weight: 600;
  color: var(--color-primary-700);
  font-variant-numeric: tabular-nums;
}

.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  min-width: 44px;
  min-height: 44px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-default);
  background: var(--surface-primary);
  color: var(--text-primary);
  font-size: 1.15rem;
  cursor: pointer;
  transition: all var(--motion-fast);
}

.theme-toggle-btn:hover {
  background: var(--surface-secondary);
  border-color: var(--color-primary-200);
  transform: translateY(-1px);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
  text-align: center;
  max-width: var(--content-max-width);
  margin: 0 auto var(--spacing-8);
  padding: 0 var(--spacing-4);
}

.hero-title {
  font-size: var(--text-h2);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin-bottom: var(--spacing-3);
}

.hero-title .gradient-text {
  color: var(--color-brand-primary);
  font-weight: 700;
}

.hero-subtitle {
  font-size: var(--text-body);
  color: var(--text-secondary);
  line-height: 1.55;
}

/* ==========================================================================
   Navigation Tabs
   ========================================================================== */
.nav-tabs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-3);
  max-width: var(--content-max-width);
  margin: 0 auto var(--spacing-8);
  background: var(--surface-secondary);
  padding: var(--spacing-2);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-default);
}

.tab-btn {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  min-height: 44px;
  padding: var(--spacing-3) var(--spacing-4);
  background: transparent;
  border: none;
  border-radius: var(--radius-lg);
  font-family: var(--font-sans);
  font-size: var(--text-body-sm);
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--motion-fast);
  white-space: nowrap;
}

.tab-btn:hover {
  color: var(--color-brand-primary);
  background: rgba(21, 31, 208, 0.05);
}

.tab-btn.active {
  background: var(--surface-primary);
  color: var(--color-brand-primary);
  box-shadow: var(--shadow-1);
}

/* ==========================================================================
   Tab Panels & Card Surfaces
   ========================================================================== */
.tab-panel {
  display: none;
  max-width: var(--content-max-width);
  margin: 0 auto;
}

.tab-panel.active {
  display: block;
  animation: fadeIn var(--motion-standard) ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.glass-card {
  background: var(--surface-primary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--spacing-6);
  box-shadow: var(--shadow-1);
  transition: background-color var(--motion-standard), border-color var(--motion-standard);
}

.card-header-flex {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-6);
  padding-bottom: var(--spacing-4);
  border-bottom: 1px solid var(--border-default);
}

.card-title {
  font-size: var(--text-h3);
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  letter-spacing: -0.005em;
}

/* ==========================================================================
   Progress Bar
   ========================================================================== */
.survey-progress-bar-wrap {
  margin-bottom: var(--spacing-6);
  padding: var(--spacing-4);
  background: var(--surface-secondary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-default);
}

.progress-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--text-body-sm);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-2);
}

.progress-track {
  width: 100%;
  height: 8px;
  background: var(--border-default);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: var(--color-brand-primary);
  border-radius: var(--radius-full);
  transition: width var(--motion-emphasized);
}

/* ==========================================================================
   Question Items & Form Controls
   ========================================================================== */
.question-item {
  background: var(--surface-primary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--spacing-6);
  margin-bottom: var(--spacing-5);
  box-shadow: var(--shadow-1);
  transition: border-color var(--motion-fast), box-shadow var(--motion-fast);
}

.question-item:hover {
  border-color: var(--color-primary-200);
}

.question-header {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-4);
  margin-bottom: var(--spacing-4);
}

.question-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  min-width: 32px;
  min-height: 32px;
  border-radius: var(--radius-full);
  background: var(--color-primary-50);
  color: var(--color-primary-600);
  font-size: var(--text-body-sm);
  font-weight: 700;
  border: 1px solid var(--color-primary-200);
}

.question-text-wrap {
  flex: 1;
}

.question-title {
  font-size: var(--text-h4);
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.35;
}

.required-star {
  color: var(--color-error);
  font-weight: 700;
  margin-left: 2px;
}

.question-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--color-primary-50);
  color: var(--color-primary-700);
  font-size: var(--text-caption);
  font-weight: 600;
  margin-left: var(--spacing-2);
  vertical-align: middle;
}

.question-input-wrap {
  margin-top: var(--spacing-4);
}

/* Options Grid (Radio & Checkbox) */
.options-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-3);
}

.custom-option-label {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  padding: var(--spacing-3) var(--spacing-4);
  min-height: 48px;
  background: var(--surface-primary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: var(--text-body-size);
  color: var(--text-body);
  transition: all var(--motion-fast);
  user-select: none;
}

.custom-option-label:hover {
  background: var(--color-primary-50);
  border-color: var(--color-primary-200);
}

.custom-option-label input[type="radio"],
.custom-option-label input[type="checkbox"] {
  width: 20px;
  height: 20px;
  accent-color: var(--color-brand-primary);
  cursor: pointer;
}

.custom-option-label:has(input:checked) {
  background: var(--color-primary-50);
  border-color: var(--color-brand-primary);
  color: var(--color-brand-primary);
  font-weight: 600;
}

/* Rating Stars */
.rating-group {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-2) 0;
}

.star-btn {
  background: transparent;
  border: none;
  font-size: 2rem;
  line-height: 1;
  color: var(--color-neutral-300);
  cursor: pointer;
  transition: color var(--motion-fast), transform var(--motion-fast);
  padding: 4px;
}

.star-btn:hover,
.star-btn.hovered,
.star-btn.active {
  color: #F59E0B;
  transform: scale(1.1);
}

.rating-label {
  font-size: var(--text-body-sm);
  font-weight: 600;
  color: var(--color-brand-primary);
  margin-left: var(--spacing-3);
}

/* Form Inputs, Textarea, Select */
.form-group {
  margin-bottom: var(--spacing-5);
}

.form-label {
  display: block;
  font-size: var(--text-body-sm);
  font-weight: 600;
  color: var(--color-neutral-800);
  margin-bottom: var(--spacing-2);
}


.form-input,
.form-select,
.form-textarea {
  width: 100%;
  min-height: 52px;
  padding: 0 var(--spacing-4);
  background: var(--surface-primary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: var(--text-body-size);
  color: var(--text-primary);
  outline: none;
  transition: border-color var(--motion-fast), box-shadow var(--motion-fast);
}

.form-textarea {
  padding: var(--spacing-3) var(--spacing-4);
  min-height: 120px;
  resize: vertical;
}

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

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--color-brand-primary);
  box-shadow: 0 0 0 3px var(--color-primary-100);
}

.form-input.is-invalid,
.form-textarea.is-invalid {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px var(--color-error-soft);
}

.support-form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-4);
}

.form-group-full {
  grid-column: 1 / -1;
}

/* ==========================================================================
   Buttons (MB Bank Standards)
   ========================================================================== */
.form-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  margin-top: var(--spacing-6);
  padding-top: var(--spacing-4);
  border-top: 1px solid var(--border-default);
}

/* Primary Button: 48px height, 12px radius, #151FD0 */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  min-height: 48px;
  padding: 0 var(--spacing-5);
  background: var(--color-brand-primary);
  color: var(--color-neutral-0);
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: var(--text-body-size);
  font-weight: 600;
  cursor: pointer;
  box-shadow: var(--shadow-1);
  transition: all var(--motion-fast);
  outline: none;
}

.btn-primary:hover {
  background: var(--color-primary-700);
  transform: translateY(-1px);
  box-shadow: var(--shadow-2);
}

.btn-primary:active {
  background: var(--color-primary-800);
  transform: translateY(0);
}

.btn-primary:focus-visible {
  box-shadow: 0 0 0 3px var(--color-primary-200);
}

/* Secondary Button: 48px height, 12px radius, white background */
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  min-height: 48px;
  padding: 0 var(--spacing-5);
  background: var(--color-neutral-0);
  color: var(--color-brand-primary);
  border: 1px solid var(--color-brand-primary);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: var(--text-body-size);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--motion-fast);
}

.btn-secondary:hover {
  background: var(--color-primary-50);
}

.btn-secondary:active {
  background: var(--color-primary-100);
}

/* Promotional Button: #CE1736 */
.btn-promo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  min-height: 48px;
  padding: 0 var(--spacing-5);
  background: var(--color-secondary-600);
  color: var(--color-neutral-0);
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: var(--text-body-size);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--motion-fast);
}

.btn-promo:hover {
  background: var(--color-secondary-700);
}

.btn-promo:active {
  background: var(--color-secondary-800);
}

/* ==========================================================================
   FAQ Section Components
   ========================================================================== */
.faq-search-box {
  position: relative;
  margin-bottom: var(--spacing-5);
}

.faq-search-input {
  width: 100%;
  min-height: 52px;
  padding: 0 var(--spacing-10) 0 var(--spacing-10);
  background: var(--surface-primary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: var(--text-body-size);
  color: var(--text-primary);
  outline: none;
  transition: border-color var(--motion-fast), box-shadow var(--motion-fast);
}

.faq-search-input:focus {
  border-color: var(--color-brand-primary);
  box-shadow: 0 0 0 3px var(--color-primary-100);
}

.search-icon {
  position: absolute;
  left: var(--spacing-4);
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.1rem;
  color: var(--text-muted);
  pointer-events: none;
}

.clear-search-btn {
  position: absolute;
  right: var(--spacing-3);
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  border-radius: var(--radius-full);
  background: var(--surface-secondary);
  border: none;
  color: var(--text-secondary);
  font-size: 0.85rem;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
}

.faq-categories {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-6);
}

.category-chip {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-2) var(--spacing-4);
  border-radius: var(--radius-full);
  background: var(--surface-secondary);
  border: 1px solid var(--border-default);
  font-size: var(--text-body-sm);
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--motion-fast);
}

.category-chip:hover {
  background: var(--color-primary-50);
  color: var(--color-brand-primary);
  border-color: var(--color-primary-200);
}

.category-chip.active {
  background: var(--color-primary-50);
  color: var(--color-brand-primary);
  border-color: var(--color-brand-primary);
}

/* FAQ Accordion Item */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
}

.faq-item {
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  background: var(--surface-primary);
  overflow: hidden;
  transition: border-color var(--motion-fast);
}

.faq-item:hover {
  border-color: var(--color-primary-200);
}

.faq-item.active {
  border-color: var(--color-brand-primary);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  min-height: 56px;
  padding: var(--spacing-4);
  background: transparent;
  border: none;
  text-align: left;
  font-family: var(--font-sans);
  font-size: var(--text-body-size);
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
}

.faq-toggle-icon {
  font-size: 1rem;
  color: var(--color-brand-primary);
  transition: transform var(--motion-standard);
  margin-left: var(--spacing-3);
}

.faq-item.active .faq-toggle-icon {
  transform: rotate(180deg);
}

.faq-answer {
  display: none;
  padding: 0 var(--spacing-4) var(--spacing-4);
  font-size: var(--text-body-sm);
  color: var(--text-body);
  line-height: 1.6;
  border-top: 1px solid var(--border-default);
  margin-top: 2px;
  padding-top: var(--spacing-3);
}

.faq-item.active .faq-answer {
  display: block;
  animation: fadeIn var(--motion-standard) ease-out;
}

/* ==========================================================================
   Toast Notifications (Top-Right Corner)
   ========================================================================== */
.toast-container {
  position: fixed;
  top: var(--spacing-6);
  right: var(--spacing-6);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
  max-width: 420px;
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  padding: var(--spacing-4) var(--spacing-5);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: var(--text-body-sm);
  font-weight: 500;
  line-height: 1.4;
  box-shadow: var(--shadow-2);
  pointer-events: auto;
  animation: slideInRight var(--motion-standard) ease-out;
}

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(40px); }
  to { opacity: 1; transform: translateX(0); }
}

.toast.toast-success,
.toast.success {
  background: var(--color-success-soft);
  border: 1px solid var(--color-success-border);
  color: var(--color-success);
}

.toast.toast-error,
.toast.error {
  background: var(--color-error-soft);
  border: 1px solid var(--color-error-border);
  color: var(--color-error);
}

.toast.toast-info,
.toast.info {
  background: var(--color-info-soft);
  border: 1px solid var(--color-info-border);
  color: var(--color-info);
}

.toast.toast-warning,
.toast.warning {
  background: var(--color-warning-soft);
  border: 1px solid var(--color-warning-border);
  color: var(--color-warning);
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: var(--spacing-10) var(--spacing-4);
  color: var(--text-secondary);
}

.empty-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-3);
}

/* ==========================================================================
   Responsive Breakpoints (1200px desktop, 8 cols tablet, 4 cols mobile)
   ========================================================================== */
@media (max-width: 768px) {
  .app-container {
    padding: var(--spacing-4) var(--mobile-gutter) var(--spacing-16);
  }

  .app-header {
    position: static;
    top: auto;
    padding: var(--spacing-3) var(--spacing-4);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-6);
  }

  .brand-info h1 {
    font-size: 1.05rem;
  }

  .brand-info p {
    font-size: var(--text-caption);
  }

  .hero-title {
    font-size: var(--text-h3);
  }

  .hero-subtitle {
    font-size: var(--text-body-sm);
  }

  .nav-tabs {
    flex-direction: column;
    gap: var(--spacing-2);
  }

  .tab-btn {
    width: 100%;
    justify-content: flex-start;
  }

  .glass-card {
    padding: var(--spacing-4);
    border-radius: var(--radius-md);
  }

  .question-item {
    padding: var(--spacing-4);
  }

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

  .form-actions {
    justify-content: stretch;
  }

  .btn-primary,
  .btn-secondary,
  .btn-promo {
    width: 100%;
  }

  .toast-container {
    top: var(--spacing-4);
    right: var(--mobile-gutter);
    left: var(--mobile-gutter);
    bottom: auto;
  }
}