/* DIGITAL FLAGSHIP EXPERIENCE - Responsive Styles */
/* FIXED: Added transform + opacity animation for mobile menu motion */
/* Exactly 3 modes: PHONE, TABLET, DESKTOP */

/* Exactly 3 modes: PHONE, TABLET, DESKTOP */

/* PHONE: 0-767px */
@media (max-width: 767px) {
  .site-header {
    position: relative;
  }
  
  .header-content {
    height: 56px;
  }
  
  .site-logo span {
    display: none;
  }
  
  .desktop-nav {
    display: none;
  }
  
  .header-utilities {
    gap: var(--spacing-sm);
  }
  
  .lang-switcher {
    display: none;
  }
  
  .theme-toggle {
    width: 38px;
    height: 38px;
  }
  .business-status {
    min-height: 36px;
    padding: var(--spacing-xxs) var(--spacing-xs);
    font-size: var(--font-size-xxs);
  }

  .mobile-hours-info {
    padding: var(--spacing-xs) var(--spacing-md);
  }
  
  .calc-link {
    display: none;
  }
  
  .mobile-utilities {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
  }
  
  .mobile-menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    padding: 0;
    background: transparent;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-fast);
  }
  
  .mobile-menu-toggle:hover {
    background: var(--color-surface-dark);
  } 
  .mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: var(--z-modal-backdrop);
    opacity: 0;
    visibility: hidden;
    transition: opacity 220ms ease, visibility 220ms ease;
  }
  
  .mobile-menu-open .mobile-menu {
    opacity: 1;
    visibility: visible;
  }
  
  .mobile-menu-inner {
    position: absolute;
    top: 0;
    left: 10px;
    width: min(380px, calc(100vw - 20px));
    max-height: calc(100dvh - 100px);
    transform: translateX(24px) scale(.98);
    opacity: 0;
    transition: transform 220ms ease, opacity 220ms ease;
  }
  
  .mobile-menu-open .mobile-menu-inner {
    transform: translateX(0) scale(1);
    opacity: 1;
  }
  
  .mobile-nav-list {
    list-style: none;
    margin: 0;
    padding-left: 0;
  }
  
  .mobile-submenu {
    list-style: none;
    margin: 0;
    padding-left: var(--spacing-lg);
  }
  
  .submenu-toggle {
    display: grid;
    grid-template-columns: 20px minmax(0, 1fr) 16px;
    align-items: center;
    column-gap: var(--spacing-sm);
    text-align: left;
    justify-content: initial;
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: none;
    cursor: pointer;
  }

  .submenu-toggle:hover {
    background: var(--color-surface-dark);
  }

  .submenu-toggle .submenu-arrow {
    justify-self: end;
  }

  .mobile-nav-link {
    display: grid;
    grid-template-columns: 20px 1fr;
    align-items: center;
    column-gap: var(--spacing-sm);
    text-align: left;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text);
    text-decoration: none;
  }

  .mobile-nav-link:hover {
    background: var(--color-surface-dark);
  }

  .submenu-arrow {
    transition: transform var(--transition-fast);
  }
  
  .submenu-toggle[aria-expanded="true"] .submenu-arrow {
    transform: rotate(90deg);
  }
  
  .mobile-footer {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    border-top: 1px solid var(--color-border);
  }
  
  .action-btn {
    flex: 1;
    flex-direction: column;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
  }
  
  .action-btn span {
    font-size: var(--font-size-xxs);
  }
  
  .contact-rail {
    display: none;
  }
  
  .mobile-contact-bar {
    display: none;
  }
  
  .mobile-contact-bar__actions {
    width: 100%;
    justify-content: space-around;
  }
  
  .mobile-contact-bar__btn {
    flex-direction: column;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
  }
  
  .mobile-contact-bar__label {
    font-size: var(--font-size-xxs);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
  }
  
  main {
    padding-bottom: calc(96px + env(safe-area-inset-bottom, 0px));
  }
  
  @media (max-width: 359px) {
    .mobile-contact-bar__label {
      display: none;
    }
    
    .mobile-contact-bar__btn {
      padding: var(--spacing-xs);
    }
  }
  
  /* Mobile Footer Accordion */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .footer-section {
    border-bottom: 1px solid var(--color-border);
  }

  .footer-section:last-child {
    border-bottom: none;
  }

  .footer-section-summary {
    min-height: 44px;
  }

  .footer-section .footer-links {
    padding-bottom: var(--spacing-sm);
  }
  
  .footer-col {
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--spacing-md);
  }
  
  .footer-col:last-child {
    border-bottom: none;
    padding-bottom: 0;
  }
  
  .footer-col h4 {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
  }
  
  .footer-links {
    list-style: none;
    margin: 0;
    padding-left: 0;
  }
  
  .footer-links li {
    margin-bottom: 0;
  }
  
  .footer-links a {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    min-height: 44px;
    padding: var(--spacing-xs) 0;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
  }
  
  .footer-links a:hover {
    color: var(--color-primary);
  }
  
  .footer-links a svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
  }

  .footer-bottom {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
  }

  .site-footer {
    padding-bottom: calc(88px + env(safe-area-inset-bottom));
  }
  
  /* Calculator */
  .calculator-card {
    padding: 22px;
  }

  /* Calculator Mobile UI */
  .form-select,
  .form-input {
    min-height: 52px;
    box-sizing: border-box;
  }

  .form-select {
    height: 52px;
    padding-top: 0;
    padding-bottom: 0;
    line-height: normal;
  }

  .day-btn {
    min-width: 44px;
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    color: var(--color-text);
    cursor: pointer;
  }

  .day-btn:hover {
    background: var(--color-surface-dark);
  }

  .day-btn.selected,
  .day-btn[aria-pressed="true"] {
    background: var(--color-primary);
    color: var(--color-primary-contrast);
    border-color: var(--color-primary);
  }

  .quick-days {
    flex-wrap: wrap;
  }
  
  .day-btn {
    min-width: 44px;
    padding: var(--spacing-xs) var(--spacing-sm);
  }
  
  .calculator-cta {
    flex-direction: column;
  }
  
  .calculator-cta .btn {
    width: 100%;
  }
  
  /* Assistant — pill gọn trên mobile, chừa safe-area, không che CTA */
  .assistant-toggle {
    bottom: calc(16px + env(safe-area-inset-bottom, 0px));
    right: max(16px, env(safe-area-inset-right, 0px));
    height: 44px;
    padding: 0 14px 0 12px;
    gap: 6px;
  }

  .assistant-toggle__label {
    font-size: var(--font-size-xs);
  }
  
  .assistant-panel {
    bottom: calc(72px + env(safe-area-inset-bottom, 0px));
    right: 10px;
    left: 10px;
    width: auto;
    max-width: none;
    max-height: calc(100dvh - 200px);
  }
  
  .assistant-question-list {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    gap: 10px;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding: 4px 2px 8px;
  }
  
  .assistant-question-list::-webkit-scrollbar {
    display: none;
  }
  
  .assistant-question-btn {
    width: auto;
    flex: 0 0 auto;
    min-height: 40px;
    padding: 8px 16px;
    white-space: nowrap;
    border-radius: 999px;
  }
  
  .assistant-question-list-title {
    display: none;
  }
  
  /* Hero */
  .hero {
    padding: var(--spacing-2xl) 0;
  }
  
  .hero-title {
    font-size: var(--font-size-2xl);
  }
  
  .hero-cta {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .hero-cta .btn {
    width: 100%;
  }
  
  /* Other sections */
  .blog-grid,
  .services-grid,
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  
  .intro-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
  }
  
  .intro-feature {
    display: flex;
    
align-items: center;
    gap: var(--spacing-sm);
  }
  
  .feature-icon {
    color: var(--color-success);
  }
  
  .areas-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
  }
  
  .area-tag {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-surface-dark);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
  }
  
  .about-content {
    flex-direction: column;
    gap: var(--spacing-lg);
  }
  
  .about-text,
  .about-contact {
    width: 100%;
  }
  
  .social-links {
    justify-content: flex-start;
  }
  
  .commitments {
    list-style: none;
    padding-left: 0;
  }
  
  .commitments li {
    margin-bottom: var(--spacing-xs);
    padding-left: var(--spacing-md);
    position: relative;
  }
  
  .commitments li::before {
    content: "\2713";
    position: absolute;
    left: 0;
    color: var(--color-success);
  }
  
  .cta-group {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .cta-group .btn {
    width: 100%;
  }

  /* Phone Launcher */
  .phone-launcher {
    position: fixed;
    bottom: calc(20px + env(safe-area-inset-bottom, 0px));
    left: max(16px, env(safe-area-inset-left, 0px));
    z-index: var(--z-fixed);
  }
  
  .phone-launcher__toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    padding: 0;
    background: var(--color-primary);
    color: var(--color-primary-contrast);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  }
  
  .phone-launcher__toggle:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-xl);
  }
  
  .phone-launcher__toggle:focus {
    outline: 2px solid var(--color-primary-dark);
    outline-offset: 2px;
  }
  
  .phone-launcher__actions {
    position: absolute;
    bottom: calc(100% + 12px);
    left: 0;
    width: 220px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: 8px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: opacity var(--transition-fast), visibility var(--transition-fast), transform var(--transition-fast);
  }
  
  .phone-launcher__actions[hidden] {
    display: none;
  }
  
  .phone-launcher__actions:not([hidden]) {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  
  .phone-launcher__action {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: background var(--transition-fast);
    font-size: var(--font-size-sm);
  }
  
  .phone-launcher__action:hover {
    background: var(--color-surface-dark);
    color: var(--color-primary);
  }
  
  .phone-launcher__action:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: -2px;
  }
}

/* TABLET: 768-1199px */
@media (min-width: 768px) and (max-width: 1199px) {
  .phone-launcher { display: none; }
  .site-header {
    position: sticky;
    top: 0;
  }
  
  .header-content {
    height: 60px;
  }
  
  .site-logo span {
    display: block;
  }
  
  .desktop-nav {
    display: none;
  }
  
  .lang-switcher {
    display: flex;
  }
  
  .theme-toggle {
    width: 40px;
    height: 40px;
  }
  
  .calc-link {
    display: flex;
  }
  
  .mobile-utilities {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
  }
  
  .mobile-menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    padding: 0;
    background: transparent;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-fast);
  }
  
  .mobile-menu-toggle:hover {
    background: var(--color-surface-dark);
  } 
  .mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: var(--z-modal-backdrop);
    opacity: 0;
    visibility: hidden;
    transition: opacity 220ms ease, visibility 220ms ease;
  }
  
  .mobile-menu-open .mobile-menu {
    opacity: 1;
    visibility: visible;
  }
  
  .mobile-menu-inner {
    position: absolute;
    top: 0;
    left: 10px;
    width: min(420px, 90vw);
    max-height: calc(100dvh - 100px);
    box-shadow: var(--shadow-xl);
    transform: translateX(24px) scale(.98);
    opacity: 0;
    transition: transform 220ms ease, opacity 220ms ease;
  }
  
  .mobile-menu-open .mobile-menu-inner {
    transform: translateX(0) scale(1);
    opacity: 1;
  }
  
  .mobile-nav-list {
    list-style: none;
    margin: 0;
    padding-left: 0;
  }
  
  .mobile-submenu {
    list-style: none;
    margin: 0;
    padding-left: var(--spacing-lg);
  }
  
  .contact-rail {
    display: none;
  }
  
  .mobile-contact-bar {
    display: flex;
  }
  
  main {
    padding-bottom: 70px;
  }
  
  /* Footer */
  .footer-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
  }
  
  .brand-col {
    grid-column: span 3;
  }
  
  .footer-col h4 {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
  }
  
  .footer-links {
    list-style: none;
    margin: 0;
    padding-left: 0;
  }
  
  /* Calculator */
  .calculator-card {
    padding: 24px;
  }
  
  .form-select,
  .form-input {
    height: 50px;
  }
  
  /* Other sections */
  .blog-grid,
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .intro-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
  }
  
  .about-content {
    flex-direction: row;
    gap: var(--spacing-xl);
  }
  
  .about-text,
  .about-contact {
    flex: 1;
  }
  
  .business-address {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
  }
  
  .business-address p {
    margin: 0;
  }
  
  .commitments {
    list-style: none;
    padding-left: 0;
  }
  
  .commitments li {
    margin-bottom: var(--spacing-xs);
    padding-left: var(--spacing-md);
    position: relative;
  }
  
  .commitments li::before {
    content: "\2713";
    position: absolute;
    left: 0;
    color: var(--color-success);
  }
  
  .cta-group {
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm);
  }
}

/* DESKTOP: 1200px+ */
@media (min-width: 1200px) {
  .phone-launcher { display: none; }
  .site-header {
    position: sticky;
    top: 0;
  }
  
  .header-content {
    height: 60px;
  }
  
  .site-logo span {
    display: block;
  }
  
  .desktop-nav {
    display: flex;
  }
  
  .lang-switcher {
    display: flex;
  }
  
  .theme-toggle {
    width: 40px;
    height: 40px;
  }
  
  .calc-link {
    display: flex;
  }
  
  .mobile-utilities {
    display: none;
  }
  
  .mobile-menu {
    display: none;
  }
  
  .contact-rail {
    display: flex;
  }
  
  .mobile-contact-bar {
    display: none;
  }
  
  main {
    padding-bottom: 0;
  }
  
  /* Footer */
  .footer-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
  }
  
  .brand-col {
    grid-column: span 1;
  }
  
  .footer-col h4 {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
  }
  
  .footer-links {
    list-style: none;
    margin: 0;
    padding-left: 0;
  }
  
  /* Calculator */
  .calculator-card {
    padding: 28px;
  }
  
  .form-select,
  .form-input {
    height: 54px;
  }
  
  /* Other sections */
  .services-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .blog-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .pricing-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .intro-features {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
  }
  
  .about-content {
    flex-direction: row;
    gap: var(--spacing-2xl);
  }
  
  .about-text,
  .about-contact {
    flex: 1;
  }
  
  .business-address {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
  }
  
  .business-address p {
    margin: 0;
  }
  
  .commitments {
    list-style: none;
    padding-left: 0;
  }
  
  .commitments li {
    margin-bottom: var(--spacing-xs);
    padding-left: var(--spacing-md);
    position: relative;
  }
  
  .commitments li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-success);
  }
  
  .cta-group {
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm);
  }
  
  /* Hero */
  .hero {
    padding: var(--spacing-3xl) 0;
  }
  
  .hero-title {
    font-size: var(--font-size-3xl);
  }
  
  .hero-cta {
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
  }
  
  .hero-cta .btn {
    min-width: 160px;
  }
}

/* ====================
   REDUCED MOTION SUPPORT
   ==================== */
@media (prefers-reduced-motion: reduce) {
  .mobile-menu,
  .mobile-menu-inner,
  .mobile-menu-open .mobile-menu,
  .mobile-menu-open .mobile-menu-inner {
    transition: none !important;
  }
}
/* ============================================
   TOPIC DIRECTORY — responsive
   1 cột < 768px; 2 cột 768–1199px; 3 cột >= 1200px.
   ============================================ */
@media (min-width: 768px) {
  .topic-directory {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--spacing-md);
  }
}

@media (min-width: 1200px) {
  .topic-directory {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ============================================================
   ARTICLE BODY — responsive (375/390/430 -> 1440)
   ============================================================ */
@media (max-width: 767px) {
  .article-body,
  .article-toc,
  .post-navigation,
  .post-cta,
  .article-related {
    max-width: 100%;
  }

  .article-body {
    font-size: 1rem;            /* 16px mobile */
    line-height: 1.75;
  }

  .post-header h1 {
    font-size: var(--font-size-xl);
  }

  .post-dek {
    font-size: var(--font-size-sm);
  }

  .article-related .post-grid {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 768px) {
  .article-body {
    font-size: 1.0625rem;      /* 17px desktop */
    line-height: 1.7;
  }

  .article-related .post-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .article-related .post-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Đảm bảo mọi phần tử prose không tràn ngang (bảng cuộn trong khung) */
.article-body > * {
  max-width: 100%;
}