/* ============================================================================
 * css/public-theme.css — Light White-Blue Theme (Public Pages)
 * Áp dụng cho: index.html, student-login.html, tutor-login.html,
 *             homework.html, student-dashboard.html, login.html
 * ============================================================================ */

:root {
  --bg-page:              #F0F7FF;
  --bg-page-gradient:     linear-gradient(160deg, #F0F7FF 0%, #E0EFFF 50%, #F5F8FF 100%);
  --header-bg:            rgba(255, 255, 255, 0.95);
  --header-border:        #DBEAFE;
  --bg-card:              #FFFFFF;
  --bg-card-alt:          #F8FAFF;
  --bg-input:             #F8FAFF;
  --bg-overlay:           rgba(15, 23, 42, 0.5);
  --border-color:         #DBEAFE;
  --border-card:          #E2E8F0;
  --text-primary:         #1E293B;
  --text-secondary:       #64748B;
  --text-muted:           #94A3B8;
  --nav-btn-text:         #475569;
  --color-primary:        #3B82F6;
  --color-primary-dark:   #1D4ED8;
  --color-primary-light:  #93C5FD;
  --color-primary-rgb:    59, 130, 246;
  --color-accent-kpi:     #2563EB;
  --highlight-color:      #2563EB;
  --nav-active-bg:        #EFF6FF;
  --nav-active-text:      #2563EB;
  --nav-active-border:    #BFDBFE;
  --nav-hover-bg:         rgba(59, 130, 246, 0.06);
  --btn-bg:               linear-gradient(135deg, #3B82F6, #1D4ED8);
  --btn-text:             #FFFFFF;
  --shadow-card:          0 4px 20px rgba(59, 130, 246, 0.08);
  --shadow-primary:       0 6px 20px rgba(59, 130, 246, 0.25);
  --scrollbar-thumb:      #93C5FD;
}

/* ============================================================================
 * NAVBAR & HEADER CHUẨN ĐỒNG NHẤT 100% VỚI TRANG CHỦ (INDEX.HTML)
 * Đảm bảo trên mọi trang đăng nhập (student-login, tutor-login, homework, login),
 * cỡ chữ, kích thước, chiều cao và độ bo của các nút luôn đồng nhất tuyệt đối.
 * ============================================================================ */
.header {
    position: sticky !important;
    top: 0 !important;
    left: 0 !important;
    width: 100% !important;
    z-index: 1000 !important;
    background: var(--header-bg, rgba(255, 255, 255, 0.95)) !important;
    backdrop-filter: blur(12px) !important;
    -webkit-backdrop-filter: blur(12px) !important;
    border-bottom: 1px solid var(--header-border, #DBEAFE) !important;
    padding: 12px 24px !important;
    padding-top: calc(constant(safe-area-inset-top, 0px) + 12px) !important;
    padding-top: calc(env(safe-area-inset-top, 0px) + 12px) !important;
    padding-left: calc(constant(safe-area-inset-left, 0px) + 24px) !important;
    padding-left: calc(env(safe-area-inset-left, 0px) + 24px) !important;
    padding-right: calc(constant(safe-area-inset-right, 0px) + 24px) !important;
    padding-right: calc(env(safe-area-inset-right, 0px) + 24px) !important;
    box-sizing: border-box !important;
}

.nav-container {
    width: 100% !important;
    max-width: 1200px !important;
    margin: 0 auto !important;
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    gap: 20px !important;
    box-sizing: border-box !important;
}

.nav-left {
    display: flex !important;
    align-items: center !important;
    gap: 16px !important;
    text-decoration: none !important;
    cursor: pointer !important;
}

.nav-logo {
    width: 38px !important;
    height: 38px !important;
    object-fit: contain !important;
    flex-shrink: 0 !important;
}

.header-text {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif !important;
    min-width: 0 !important;
}

.header-text h1 {
    font-size: 18px !important;
    font-weight: 700 !important;
    color: var(--text-primary, #1E293B) !important;
    margin: 0 !important;
    margin-bottom: -2px !important;
    letter-spacing: -0.5px !important;
    line-height: 1.2 !important;
    white-space: nowrap !important;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif !important;
}

.header-text p {
    font-size: 11px !important;
    color: var(--text-secondary, #64748B) !important;
    font-weight: 500 !important;
    margin: 0 !important;
    line-height: 1.2 !important;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif !important;
}

.nav-right {
    display: flex !important;
    align-items: center !important;
    gap: 12px !important;
    margin-left: auto !important;
}

/* Navigation Buttons - CỠ CHỮ & ĐỘ TO CỦA NÚT CHUẨN TRANG CHỦ 100% */
.nav-btn {
    background: var(--bg-input, #F8FAFF) !important;
    color: var(--nav-btn-text, #475569) !important;
    border: 1px solid var(--border-card, #E2E8F0) !important;
    padding: 10px 20px !important;
    border-radius: 30px !important;
    font-size: 13.5px !important;
    font-weight: 600 !important;
    line-height: 1.2 !important;
    height: 38px !important;
    min-height: 38px !important;
    max-height: 38px !important;
    box-sizing: border-box !important;
    cursor: pointer !important;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1) !important;
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 8px !important;
    text-decoration: none !important;
    white-space: nowrap !important;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif !important;
    -webkit-font-smoothing: subpixel-antialiased !important;
    -moz-osx-font-smoothing: auto !important;
}

.nav-btn i {
    font-size: 14px !important;
    line-height: 1 !important;
    display: inline-block !important;
}

.nav-btn:hover {
    background: var(--nav-hover-bg, rgba(59, 130, 246, 0.06)) !important;
    border-color: var(--border-color, #DBEAFE) !important;
    color: var(--text-primary, #1E293B) !important;
    transform: translateY(-1px) !important;
}

.nav-btn.active {
    background: var(--nav-active-bg, #EFF6FF) !important;
    border: 1px solid var(--nav-active-border, #BFDBFE) !important;
    color: var(--nav-active-text, #2563EB) !important;
    font-weight: 700 !important;
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.25) !important;
}

/* ============================================================================
 * NÚT CÀI ĐẶT / TẢI APP TRÊN HEADER (ĐỒNG BỘ THEME TRANG CHỦ)
 * ============================================================================ */
.nav-install-btn {
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 7px !important;
    background: linear-gradient(135deg, #2563EB 0%, #1D4ED8 100%) !important;
    color: #FFFFFF !important;
    border: 1px solid rgba(255, 255, 255, 0.3) !important;
    padding: 0 16px !important;
    height: 38px !important;
    min-height: 38px !important;
    border-radius: 30px !important;
    font-size: 13px !important;
    font-weight: 700 !important;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif !important;
    cursor: pointer !important;
    box-shadow: 0 4px 14px rgba(37, 99, 235, 0.28) !important;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1) !important;
    text-decoration: none !important;
    white-space: nowrap !important;
    flex-shrink: 0 !important;
    user-select: none !important;
    -webkit-tap-highlight-color: transparent !important;
}

.nav-install-btn i {
    font-size: 13.5px !important;
    color: #FFFFFF !important;
    line-height: 1 !important;
}

.nav-install-btn:hover {
    background: linear-gradient(135deg, #1D4ED8 0%, #1E40AF 100%) !important;
    box-shadow: 0 6px 18px rgba(37, 99, 235, 0.4) !important;
    transform: translateY(-1px) !important;
}

.nav-install-btn:active {
    transform: scale(0.95) !important;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.2) !important;
}

.is-pwa-standalone .nav-install-btn {
    display: none !important;
}

/* ============================================================================
 * NAVBAR RESPONSIVE & HAMBURGER (ĐỒNG BỘ 100% TRÊN MỌI TRANG PUBLIC)
 * ============================================================================ */

/* Nút Hamburger — MẶC ĐỊNH LUÔN ẨN TUYỆT ĐỐI TRÊN DESKTOP */
.hamburger-btn {
    display: none !important;
    background: none !important;
    border: none !important;
    color: var(--nav-btn-text, #1E293B) !important;
    font-size: 22px !important;
    cursor: pointer !important;
    padding: 8px !important;
    min-width: 44px !important;
    min-height: 44px !important;
    align-items: center !important;
    justify-content: center !important;
    border-radius: 10px !important;
    transition: background 0.2s !important;
    outline: none !important;
    box-shadow: none !important;
}
.hamburger-btn:hover {
    background: var(--nav-hover-bg, rgba(59, 130, 246, 0.08)) !important;
}

/* Menu Dropdown Mobile — MẶC ĐỊNH LUÔN ẨN TUYỆT ĐỐI TRÊN DESKTOP */
.mobile-nav-dropdown {
    display: none !important;
    position: absolute !important;
    top: 100% !important;
    right: 0 !important;
    left: 0 !important;
    background: var(--header-bg, rgba(255, 255, 255, 0.98)) !important;
    border-bottom: 1px solid var(--header-border, #DBEAFE) !important;
    backdrop-filter: blur(16px) !important;
    -webkit-backdrop-filter: blur(16px) !important;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08) !important;
    z-index: 998 !important;
    padding: 8px !important;
    flex-direction: column !important;
    gap: 4px !important;
}

.mobile-nav-dropdown.open {
    display: flex !important;
}

.mobile-nav-item {
    padding: 12px 16px !important;
    border-radius: 10px !important;
    color: var(--nav-btn-text, #1E293B) !important;
    text-decoration: none !important;
    font-size: 14.5px !important;
    font-weight: 600 !important;
    display: flex !important;
    align-items: center !important;
    gap: 12px !important;
    min-height: 46px !important;
    transition: background 0.2s, color 0.2s !important;
    box-sizing: border-box !important;
}
.mobile-nav-item:hover,
.mobile-nav-item.active {
    background: var(--nav-active-bg, #EFF6FF) !important;
    color: var(--nav-active-text, #2563EB) !important;
}
.mobile-nav-item i {
    width: 20px !important;
    text-align: center !important;
}

/* Khi màn hình > 768px (Desktop & Tablet ngang): Ẩn hamburger và dropdown, hiện nav-right */
@media (min-width: 769px) {
    .hamburger-btn {
        display: none !important;
    }
    .mobile-nav-dropdown {
        display: none !important;
    }
    .nav-right {
        display: flex !important;
    }
}

/* MÀN HÌNH ĐIỆN THOẠI & TABLET DỌC (≤ 768px): Ẩn nav-right, hiển thị nút Hamburger ☰ */
@media (max-width: 768px) {
    .header {
        padding: 10px 16px !important;
        padding-top: calc(constant(safe-area-inset-top, 0px) + 10px) !important;
        padding-top: calc(env(safe-area-inset-top, 0px) + 10px) !important;
        padding-left: calc(constant(safe-area-inset-left, 0px) + 16px) !important;
        padding-left: calc(env(safe-area-inset-left, 0px) + 16px) !important;
        padding-right: calc(constant(safe-area-inset-right, 0px) + 16px) !important;
        padding-right: calc(env(safe-area-inset-right, 0px) + 16px) !important;
        width: 100% !important;
        box-sizing: border-box !important;
    }
    .nav-container {
        width: 100% !important;
        display: flex !important;
        align-items: center !important;
        justify-content: space-between !important;
        gap: 12px !important;
        box-sizing: border-box !important;
    }
    .nav-left {
        gap: 10px !important;
        min-width: 0 !important;
        flex-shrink: 1 !important;
    }
    .nav-logo {
        width: 34px !important;
        height: 34px !important;
        flex-shrink: 0 !important;
    }
    .header-text {
        min-width: 0 !important;
    }
    .header-text h1 {
        font-size: 15.5px !important;
        white-space: nowrap !important;
        overflow: hidden !important;
        text-overflow: ellipsis !important;
        margin: 0 !important;
        line-height: 1.2 !important;
    }
    .header-text p {
        display: none !important;
    }
    .nav-right {
        display: none !important;
    }
    .hamburger-btn {
        display: none !important;
    }
}

/* ===== PHASE 17 — BOTTOM NAVIGATION (Public Pages) ===== */
.bottom-nav { display: none; }

body.logged-in .bottom-nav,
.logged-in .bottom-nav,
.bottom-nav.hidden-nav,
.bottom-nav[style*="display: none"],
.bottom-nav[style*="display:none"] {
  display: none !important;
}

@media (max-width: 768px) {
  .bottom-nav {
    display: flex !important;
    position: fixed !important;
    bottom: 0 !important;
    left: 0 !important;
    right: 0 !important;
    width: 100% !important;
    max-width: 100vw !important;
    box-sizing: border-box !important;
    overflow: hidden !important;
    height: calc(60px + env(safe-area-inset-bottom, 0px)) !important;
    padding-bottom: env(safe-area-inset-bottom, 0px) !important;
    background: rgba(255, 255, 255, 0.97) !important;
    backdrop-filter: blur(20px) !important;
    -webkit-backdrop-filter: blur(20px) !important;
    border-top: 1px solid #E2E8F0 !important;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.06) !important;
    z-index: 9000 !important;
    align-items: center !important;
    justify-content: space-around !important;
  }
  body.logged-in .bottom-nav,
  .logged-in .bottom-nav,
  .bottom-nav.hidden-nav,
  .bottom-nav[style*="display: none"],
  .bottom-nav[style*="display:none"] {
    display: none !important;
  }
  .bottom-nav-item {
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 3px !important;
    padding: 6px 2px !important;
    text-decoration: none !important;
    border-radius: 12px !important;
    transition: all 0.2s !important;
    flex: 1 1 0 !important;
    width: 25% !important;
    max-width: 25% !important;
    min-width: 0 !important;
    box-sizing: border-box !important;
    min-height: 48px !important;
    position: relative !important;
    -webkit-tap-highlight-color: transparent !important;
  }
  .bottom-nav-item i {
    font-size: 20px !important;
    color: #94A3B8 !important;
    transition: color 0.2s, transform 0.2s !important;
  }
  .bottom-nav-item span {
    font-size: 10px !important;
    font-weight: 600 !important;
    color: #94A3B8 !important;
    font-family: Inter, sans-serif !important;
    white-space: nowrap !important;
    text-overflow: ellipsis !important;
    overflow: hidden !important;
    max-width: 100% !important;
    text-align: center !important;
    transition: color 0.2s !important;
  }
  .bottom-nav-item.active i  { color: #3B82F6 !important; transform: scale(1.1) !important; }
  .bottom-nav-item.active span { color: #3B82F6 !important; }
  .bottom-nav-item.active { background: rgba(59, 130, 246, 0.08) !important; }
  .bottom-nav-item:active { transform: scale(0.94) !important; }

  /* Ẩn hamburger + desktop nav + dropdown cũ */
  .hamburger-btn        { display: none !important; }
  .nav-right            { display: none !important; }
  .mobile-nav-dropdown  { display: none !important; }

  /* Padding bottom để content không bị bottom nav che */
  body { padding-bottom: calc(68px + env(safe-area-inset-bottom, 0px)) !important; }
  body.logged-in { padding-bottom: 24px !important; }
}

/* ===== PHASE 17 — HEADER COMPACT ===== */
@media (max-width: 768px) {
  .header {
    padding: 8px 16px !important;
    min-height: 52px !important;
  }
  .nav-logo { width: 32px !important; height: 32px !important; }
  .header-text h1 { font-size: 14px !important; margin: 0 !important; }
  .header-text p  { display: none !important; }
  .nav-container  { min-height: 52px !important; }
  .nav-install-btn {
    height: 34px !important;
    min-height: 34px !important;
    padding: 0 13px !important;
    font-size: 12.5px !important;
    border-radius: 20px !important;
    gap: 5px !important;
    margin-left: auto !important;
    box-shadow: 0 3px 10px rgba(37, 99, 235, 0.25) !important;
  }
  .nav-install-btn i {
    font-size: 12px !important;
  }
}
@media (max-width: 480px) {
  .header { padding: 6px 12px !important; min-height: 48px !important; }
  .header-text h1 { font-size: 13px !important; }
  .nav-install-btn {
    height: 31px !important;
    min-height: 31px !important;
    padding: 0 11px !important;
    font-size: 11.5px !important;
    border-radius: 16px !important;
    gap: 4px !important;
  }
  .nav-install-btn i {
    font-size: 11px !important;
  }
}

/* ===== PHASE 17 — TOAST NOTIFICATIONS MOBILE FIX ===== */
@media (max-width: 480px) {
  #toastNotification {
    right: 8px !important;
    left: 8px !important;
    top: 56px !important;
  }
  #toastNotification > div {
    min-width: unset !important;
    width: 100% !important;
    box-sizing: border-box;
  }
}

/* Chống iOS Safari tự động phóng to màn hình khi nhấn nhập liệu */
@media (max-width: 768px) {
  html { -webkit-text-size-adjust: 100%; }
  input, select, textarea { font-size: 16px !important; touch-action: manipulation; }
}

@media (max-width: 480px) {

  /* Hero section index.html */
  .hero-title  { font-size: 24px !important; line-height: 1.3 !important; }
  .hero-subtitle { font-size: 14px !important; }
  .hero-ctas { flex-direction: column !important; gap: 10px !important; }
  .btn-cta { width: 100% !important; justify-content: center !important; }
}
@media (max-width: 360px) {
  .hero-title { font-size: 20px !important; }
}

/* ===== PHASE 17 — GLOBAL POLISH ===== */

/* Smooth scroll */
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* Prevent horizontal overflow */
html, body {
  overflow-x: hidden !important;
  max-width: 100vw !important;
  width: 100% !important;
  touch-action: pan-y;
  position: relative;
}

/* Better tap experience */
@media (max-width: 768px) {
  button, a, [onclick], label {
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
  }

  /* Active press animation */
  button:active,
  .hw-kpi-card:active,
  .summary-card:active,
  .hw-assigned-card:active,
  .bottom-nav-item:active {
    transform: scale(0.95) !important;
    transition: transform 0.08s ease !important;
  }

  /* Touch targets 44px — CHỈ các class cụ thể, KHÔNG dùng selector "button" chung */
  .nav-btn, .btn-submit, .btn-cta,
  .bottom-nav-item, .action-btn-hw,
  .hw-logout-btn, .hw-btn-preview,
  .hw-btn-edit, .hw-btn-del,
  .btn-submit-feedback, .btn-back,
  .btn-load-more, .legend-btn {
    min-height: 44px !important;
  }

  /* Font 16px cho input — chỉ trong context public pages (tránh override Tailwind) */
  .search-card input, .search-card select, .search-card textarea,
  #hwLessonInput, #hwStudentInput,
  .feedback-form-container textarea,
  input[type="text"]:not([class*="text-"]),
  input[type="password"]:not([class*="text-"]),
  input[type="tel"]:not([class*="text-"]) {
    font-size: 16px !important;
  }

  /* Scrollbar nhỏ */
  ::-webkit-scrollbar { width: 3px; height: 3px; }
  ::-webkit-scrollbar-thumb { background: #CBD5E1; border-radius: 4px; }
}

/* iOS safe area cho bottom nav */
@media (max-width: 768px) {
  .bottom-nav {
    padding-bottom: max(12px, env(safe-area-inset-bottom, 0px)) !important;
    height: calc(60px + max(12px, env(safe-area-inset-bottom, 0px))) !important;
  }
}

/* Skeleton loading class (có thể dùng sau) */
.skeleton {
  background: linear-gradient(90deg, #F1F5F9 25%, #E2E8F0 50%, #F1F5F9 75%);
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s infinite;
  border-radius: 8px;
}
@keyframes skeleton-shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ============================================================
 * PHASE 19 — SCROLL REVEAL ANIMATIONS (Cuộn đến đâu hiện đến đó)
 * ============================================================ */

/* Fade + trượt lên từ dưới */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}
.reveal.visible {
  opacity: 1 !important;
  transform: translateY(0) !important;
  will-change: auto;
}

/* Stagger: Các thẻ con trượt lên so le lần lượt */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.55s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.55s cubic-bezier(0.16, 1, 0.3, 1) !important;
  will-change: opacity, transform;
}
.reveal-stagger.visible > * {
  opacity: 1 !important;
  transform: translateY(0) !important;
  will-change: auto;
}
.reveal-stagger.visible > *:nth-child(1) { transition-delay: 0.05s !important; }
.reveal-stagger.visible > *:nth-child(2) { transition-delay: 0.15s !important; }
.reveal-stagger.visible > *:nth-child(3) { transition-delay: 0.25s !important; }
.reveal-stagger.visible > *:nth-child(4) { transition-delay: 0.35s !important; }
.reveal-stagger.visible > *:nth-child(5) { transition-delay: 0.45s !important; }
.reveal-stagger.visible > *:nth-child(6) { transition-delay: 0.55s !important; }
.reveal-stagger.visible > *:nth-child(7) { transition-delay: 0.65s !important; }
.reveal-stagger.visible > *:nth-child(8) { transition-delay: 0.75s !important; }
.reveal-stagger.visible > *:nth-child(9) { transition-delay: 0.85s !important; }
.reveal-stagger.visible > *:nth-child(10) { transition-delay: 0.95s !important; }

/* Trượt từ bên trái sang */
.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.65s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.65s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}
.reveal-left.visible {
  opacity: 1 !important;
  transform: translateX(0) !important;
  will-change: auto;
}

/* Trượt từ bên phải sang */
.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.65s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.65s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}
.reveal-right.visible {
  opacity: 1 !important;
  transform: translateX(0) !important;
  will-change: auto;
}

/* Phóng to nhẹ (Scale in) */
.reveal-scale {
  opacity: 0;
  transform: scale(0.92);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}
.reveal-scale.visible {
  opacity: 1 !important;
  transform: scale(1) !important;
  will-change: auto;
}

/* Mobile: giảm khoảng cách translate */
@media (max-width: 480px) {
  .reveal        { transform: translateY(20px); }
  .reveal-stagger > * { transform: translateY(20px); }
  .reveal-left   { transform: translateX(-20px); }
  .reveal-right  { transform: translateX(20px); }
  .reveal-scale  { transform: scale(0.94); }
}

/* ============================================================================
 * PILL LOGIN & SEARCH FORMS RESPONSIVE (TỐI ƯU GIAO DIỆN NÚT TRÊN ĐIỆN THOẠI)
 * ============================================================================ */
.btn-text-portal {
  display: inline;
}

@media (max-width: 640px) {
  #formBaiTap,
  #formPhHs {
    padding: 5px 6px !important;
    box-shadow: 0 8px 25px -4px rgba(37, 99, 235, 0.15) !important;
  }

  #formBaiTap > div:first-child,
  #formPhHs > div:first-child {
    padding-left: 10px !important;
    padding-right: 6px !important;
    flex-shrink: 0 !important;
  }

  #formBaiTap > div:first-child svg,
  #formPhHs > div:first-child svg {
    width: 19px !important;
    height: 19px !important;
  }

  #formBaiTap input,
  #formPhHs input {
    font-size: 16px !important; /* Tối thiểu 16px để chống Safari iOS tự động phóng to màn hình */
    padding: 8px 4px !important;
    min-width: 0 !important;
    line-height: 1.3 !important;
  }

  #formBaiTap input::placeholder,
  #formPhHs input::placeholder {
    font-size: 13.5px !important;
    text-overflow: ellipsis;
  }

  #btnSubmitBaiTap,
  #btnSubmitPhHs {
    padding: 8px 14px !important;
    font-size: 13px !important;
    border-radius: 9999px !important;
    gap: 5px !important;
    min-height: 38px !important;
    max-height: 40px !important;
    flex-shrink: 0 !important;
  }

  #btnSubmitBaiTap .btn-icon,
  #btnSubmitPhHs .btn-icon,
  #btnSubmitBaiTap .loading-icon,
  #btnSubmitPhHs .loading-icon {
    width: 15px !important;
    height: 15px !important;
  }

  .btn-text-portal {
    display: none !important;
  }
}

@media (max-width: 420px) {
  #formBaiTap,
  #formPhHs {
    padding: 4px 5px !important;
  }

  #formBaiTap > div:first-child,
  #formPhHs > div:first-child {
    padding-left: 8px !important;
    padding-right: 4px !important;
  }

  #formBaiTap > div:first-child svg,
  #formPhHs > div:first-child svg {
    width: 17px !important;
    height: 17px !important;
  }

  #formBaiTap input,
  #formPhHs input {
    font-size: 16px !important; /* Tối thiểu 16px để chống Safari iOS tự động phóng to màn hình */
    padding: 6px 4px !important;
  }

  #formBaiTap input::placeholder,
  #formPhHs input::placeholder {
    font-size: 12.5px !important;
    text-overflow: ellipsis;
  }

  #btnSubmitBaiTap,
  #btnSubmitPhHs {
    padding: 7px 11px !important;
    font-size: 12px !important;
    gap: 4px !important;
    min-height: 35px !important;
    max-height: 37px !important;
  }

  #btnSubmitBaiTap .btn-icon,
  #btnSubmitPhHs .btn-icon,
  #btnSubmitBaiTap .loading-icon,
  #btnSubmitPhHs .loading-icon {
    width: 13px !important;
    height: 13px !important;
  }
}