/* ============================================================================
   KURO FANGS — COMPLETE MOBILE UI/UX ARCHITECTURE (v21.0)
   Scope: Smartphones Only (Portrait: <= 600px | Landscape: <= 960px & height <= 500px)
   Covers:
   - Apple iPhone: SE (2nd/3rd gen), 12/13 mini, 13/14/15/16, 16 Pro, 14/15/16 Pro Max
   - Samsung Galaxy: A14/A34/A54, S23/S24, S23/S24 Ultra
   - Xiaomi & Redmi: Xiaomi 14, Redmi 12C, Redmi Note 12/13/13 Pro
   - Viewport Widths: 320px, 330px, 344px, 360px, 375px, 390px, 393px, 402px,
                      414px, 430px, 440px, 480px, 540px, 600px + Landscape
   Does NOT alter Tablet (601px–1366px, height >= 501px) or Desktop (>= 1367px).
   ============================================================================ */

/* ----------------------------------------------------------------------------
   0. BASE STYLES FOR NEW MOBILE & STUDY SUMMARY COMPONENTS (All Viewports)
   ---------------------------------------------------------------------------- */

/* Hide Mobile-Only Navigation Controls on Tablet & Desktop by default */
.mobile-search-toggle-btn,
.mobile-search-close-btn,
.mobile-bottom-nav,
.mobile-more-backdrop,
.mobile-more-sheet {
  display: none;
}

/* Real-Data Study Summary Strip (Classes, Streak, Study Time, Questions) */
.kuro-study-summary-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  width: 100%;
  box-sizing: border-box;
}

.kuro-summary-stat-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 16px;
  background: var(--bg-card, #FFFFFF);
  border: 1px solid #E5DDD0;
  border-radius: 14px;
  box-shadow: inset 0 1px 0 #FFFFFF, 0 2px 10px rgba(36, 24, 27, 0.04);
  text-decoration: none;
  color: var(--text-primary, #24181B);
  transition: transform 0.18s cubic-bezier(0.16, 1, 0.3, 1),
              border-color 0.18s cubic-bezier(0.16, 1, 0.3, 1),
              box-shadow 0.18s cubic-bezier(0.16, 1, 0.3, 1);
  min-width: 0;
}

.kuro-summary-stat-card:hover {
  transform: translateY(-2px);
  border-color: rgba(126, 29, 42, 0.28);
  box-shadow: inset 0 1px 0 #FFFFFF, 0 6px 16px rgba(126, 29, 42, 0.08);
}

.kuro-summary-stat-card:active {
  transform: scale(0.98);
}

.kssc-icon-box {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.kssc-icon-box svg {
  width: 18px;
  height: 18px;
}

.stat-classes .kssc-icon-box {
  background: rgba(126, 29, 42, 0.09);
  color: #7E1D2A;
  border: 1px solid rgba(126, 29, 42, 0.16);
}

.stat-streak .kssc-icon-box {
  background: rgba(217, 119, 6, 0.10);
  color: #D97706;
  border: 1px solid rgba(217, 119, 6, 0.20);
}

.stat-time .kssc-icon-box {
  background: rgba(37, 99, 235, 0.09);
  color: #2563EB;
  border: 1px solid rgba(37, 99, 235, 0.18);
}

.stat-questions .kssc-icon-box {
  background: rgba(5, 150, 105, 0.09);
  color: #059669;
  border: 1px solid rgba(5, 150, 105, 0.18);
}

.kssc-meta {
  display: flex;
  flex-direction: column;
  min-width: 0;
  gap: 1px;
}

.kssc-val {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-primary, #24181B);
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.kssc-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary, #756966);
  line-height: 1.25;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

[data-theme="dark"] .kuro-summary-stat-card,
[data-theme="kuro-dark"] .kuro-summary-stat-card {
  background: #1C1A24;
  border-color: rgba(255, 255, 255, 0.08);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05), 0 4px 14px rgba(0, 0, 0, 0.28);
}

[data-theme="dark"] .kssc-val,
[data-theme="kuro-dark"] .kssc-val {
  color: #F5F2EB;
}

/* ============================================================================
   1. MASTER SMARTPHONE ARCHITECTURE (Portrait <= 599px OR Landscape Phone)
   ============================================================================ */
@media (max-width: 599px),
       ((max-width: 960px) and (max-height: 500px) and (orientation: landscape)) {

  /* Zero accidental horizontal page overflow while preserving native vertical scroll */
  html,
  body,
  .app-layout,
  .app-main-wrapper {
    max-width: 100vw !important;
    overflow-x: clip !important;
  }

  /* Slide-over Mobile Sidebar Drawer */
  .app-sidebar {
    width: min(286px, 84vw) !important;
    max-width: 84vw !important;
    height: 100dvh !important;
    padding-block-start: env(safe-area-inset-top, 0px) !important;
    padding-block-end: env(safe-area-inset-bottom, 0px) !important;
    transform: translateX(-100%) !important;
    box-shadow: 0 0 40px rgba(20, 21, 30, 0.42) !important;
    z-index: 1150 !important;
    visibility: hidden !important;
    pointer-events: none !important;
  }

  html[dir="rtl"] .app-sidebar {
    transform: translateX(100%) !important;
  }

  .app-sidebar.open {
    transform: translateX(0) !important;
    visibility: visible !important;
    pointer-events: auto !important;
  }

  .sidebar-close-btn {
    display: inline-flex !important;
    width: 40px !important;
    height: 40px !important;
    min-width: 40px !important;
    min-height: 40px !important;
  }

  html[dir="ltr"] .app-main-wrapper,
  html[dir="rtl"] .app-main-wrapper {
    margin-inline: 0 !important;
    width: 100% !important;
    max-width: 100% !important;
  }

  /* --------------------------------------------------------------------------
     MOBILE TOP HEADER (Compact, Zero Overlap, Profile & Search Accessible)
     -------------------------------------------------------------------------- */
  .site-header {
    height: auto !important;
    min-height: 54px !important;
    padding-block-start: max(7px, env(safe-area-inset-top, 7px)) !important;
    padding-block-end: 7px !important;
    padding-inline-start: max(12px, env(safe-area-inset-left, 12px)) !important;
    padding-inline-end: max(12px, env(safe-area-inset-right, 12px)) !important;
    display: flex !important;
    flex-wrap: wrap !important;
    align-items: center !important;
    justify-content: space-between !important;
    gap: 8px !important;
    background: rgba(250, 247, 242, 0.96) !important;
    backdrop-filter: blur(12px) !important;
    -webkit-backdrop-filter: blur(12px) !important;
    border-block-end: 1px solid #E5DDD0 !important;
    box-sizing: border-box !important;
    z-index: 1010 !important;
  }

  [data-theme="dark"] .site-header,
  [data-theme="kuro-dark"] .site-header {
    background: rgba(24, 22, 32, 0.96) !important;
    border-block-end-color: rgba(255, 255, 255, 0.08) !important;
  }

  /* Hide desktop center nav & redundant header settings gear on mobile
     (Primary nav is in .mobile-bottom-nav; Settings & More are in #mobile-more-sheet) */
  .header-nav-center,
  .desktop-only-nav-item,
  #settings-trigger-wrapper {
    display: none !important;
  }

  .header-left-group {
    order: 1 !important;
    display: flex !important;
    align-items: center !important;
    gap: 8px !important;
    flex: 1 1 auto !important;
    min-width: 0 !important;
  }

  .mobile-toggle-btn {
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    width: 38px !important;
    height: 38px !important;
    min-width: 38px !important;
    min-height: 38px !important;
    border-radius: 10px !important;
    border: 1px solid #E2D9C8 !important;
    background: #FFFFFF !important;
    color: #24181B !important;
    flex-shrink: 0 !important;
    padding: 0 !important;
  }

  .header-brand-identity {
    display: inline-flex !important;
    align-items: center !important;
    gap: 8px !important;
    min-width: 0 !important;
    flex-shrink: 1 !important;
    text-decoration: none !important;
  }

  .header-brand-avatar {
    width: 32px !important;
    height: 32px !important;
    flex-shrink: 0 !important;
  }

  .header-brand-avatar img {
    width: 32px !important;
    height: 32px !important;
  }

  .header-brand-name {
    font-size: 0.94rem !important;
    font-weight: 800 !important;
    max-width: 145px !important;
    white-space: nowrap !important;
    overflow: hidden !important;
    text-overflow: ellipsis !important;
  }

  .header-right-tools {
    order: 2 !important;
    display: flex !important;
    align-items: center !important;
    justify-content: flex-end !important;
    gap: 6px !important;
    flex-shrink: 0 !important;
  }

  .mobile-search-toggle-btn,
  .notifications-bell-btn {
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    width: 38px !important;
    height: 38px !important;
    min-width: 38px !important;
    min-height: 38px !important;
    border-radius: 10px !important;
    border: 1px solid #E2D9C8 !important;
    background: #FFFFFF !important;
    color: #24181B !important;
    padding: 0 !important;
    flex-shrink: 0 !important;
    cursor: pointer !important;
  }

  .mobile-search-toggle-btn svg,
  .notifications-bell-btn svg {
    width: 17px !important;
    height: 17px !important;
  }

  .site-header.mobile-search-open .mobile-search-toggle-btn {
    background: #7E1D2A !important;
    border-color: #7E1D2A !important;
    color: #FFFFFF !important;
  }

  /* Keep Student Profile / Auth Control visible & compact in mobile header (no flicker/overflow) */
  #header-auth-action-box {
    display: inline-flex !important;
    align-items: center !important;
    flex-shrink: 0 !important;
  }

  #header-auth-action-box .header-user-badge {
    padding: 3px !important;
    border-radius: 9999px !important;
    gap: 0 !important;
    min-width: 36px !important;
    min-height: 36px !important;
    justify-content: center !important;
  }

  #header-auth-action-box .header-user-avatar-circle,
  #header-auth-action-box .header-user-avatar-initial {
    width: 30px !important;
    height: 30px !important;
    font-size: 0.8rem !important;
  }

  /* Hide verbose text inside header auth badge on narrow phones so avatar fits cleanly */
  #header-auth-action-box .user-display-name,
  #header-auth-action-box .btn-header-signout,
  #header-auth-action-box .header-guest-pill {
    display: none !important;
  }

  #header-auth-action-box .header-signin-btn {
    padding: 6px 10px !important;
    min-height: 36px !important;
    font-size: 0.76rem !important;
    border-radius: 9px !important;
  }

  /* --------------------------------------------------------------------------
     FIXED MOBILE BOTTOM NAVIGATION BAR (Thumb-Friendly, Safe-Area Aware)
     -------------------------------------------------------------------------- */
  .mobile-bottom-nav {
    display: flex !important;
    align-items: center !important;
    justify-content: space-around !important;
    position: fixed !important;
    inset-block-end: 0 !important;
    inset-inline: 0 !important;
    z-index: 1020 !important;
    min-height: 58px !important;
    padding-block-start: 5px !important;
    padding-block-end: max(6px, env(safe-area-inset-bottom, 6px)) !important;
    padding-inline-start: max(6px, env(safe-area-inset-left, 6px)) !important;
    padding-inline-end: max(6px, env(safe-area-inset-right, 6px)) !important;
    background: rgba(250, 247, 242, 0.97) !important;
    backdrop-filter: blur(16px) !important;
    -webkit-backdrop-filter: blur(16px) !important;
    border-block-start: 1px solid #E2D9C8 !important;
    box-shadow: 0 -4px 20px rgba(36, 24, 27, 0.06) !important;
    box-sizing: border-box !important;
    transition: transform 0.22s cubic-bezier(0.16, 1, 0.3, 1) !important;
  }

  [data-theme="dark"] .mobile-bottom-nav,
  [data-theme="kuro-dark"] .mobile-bottom-nav {
    background: rgba(22, 20, 30, 0.97) !important;
    border-block-start-color: rgba(255, 255, 255, 0.08) !important;
  }

  /* Smoothly slide bottom nav out of the way when virtual keyboard is open */
  body.mobile-keyboard-open .mobile-bottom-nav {
    transform: translateY(105%) !important;
    pointer-events: none !important;
  }

  .mobile-bottom-item {
    flex: 1 1 0% !important;
    min-width: 0 !important;
    min-height: 48px !important;
    padding-block: 4px !important;
    padding-inline: 2px !important;
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 3px !important;
    text-decoration: none !important;
    background: transparent !important;
    border: none !important;
    color: #756966 !important;
    font-family: inherit !important;
    cursor: pointer !important;
    border-radius: 10px !important;
    transition: color 0.16s ease, transform 0.14s ease !important;
    -webkit-tap-highlight-color: transparent !important;
  }

  .mobile-bottom-item:active {
    transform: scale(0.95) !important;
  }

  .mbi-icon-wrap {
    width: 42px !important;
    height: 26px !important;
    border-radius: 9999px !important;
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    transition: background-color 0.18s cubic-bezier(0.16, 1, 0.3, 1) !important;
  }

  .mbi-icon-wrap svg {
    width: 19px !important;
    height: 19px !important;
    stroke-width: 2.1 !important;
  }

  .mbi-label {
    font-size: 0.68rem !important;
    font-weight: 700 !important;
    line-height: 1.15 !important;
    max-width: 100% !important;
    white-space: nowrap !important;
    overflow: hidden !important;
    text-overflow: ellipsis !important;
  }

  .mobile-bottom-item.active {
    color: #7E1D2A !important;
  }

  .mobile-bottom-item.active .mbi-icon-wrap {
    background: rgba(126, 29, 42, 0.12) !important;
    color: #7E1D2A !important;
  }

  [data-theme="dark"] .mobile-bottom-item.active,
  [data-theme="kuro-dark"] .mobile-bottom-item.active {
    color: #FCA5A5 !important;
  }

  [data-theme="dark"] .mobile-bottom-item.active .mbi-icon-wrap,
  [data-theme="kuro-dark"] .mobile-bottom-item.active .mbi-icon-wrap {
    background: rgba(252, 165, 165, 0.16) !important;
    color: #FCA5A5 !important;
  }

  /* --------------------------------------------------------------------------
     MOBILE "MORE" BOTTOM SHEET MENU (Organized Touch Sheet)
     -------------------------------------------------------------------------- */
  .mobile-more-backdrop {
    display: block !important;
    position: fixed !important;
    inset: 0 !important;
    background: rgba(20, 16, 18, 0.48) !important;
    backdrop-filter: blur(4px) !important;
    -webkit-backdrop-filter: blur(4px) !important;
    z-index: 1120 !important;
    opacity: 0 !important;
    visibility: hidden !important;
    pointer-events: none !important;
    transition: opacity 0.24s cubic-bezier(0.16, 1, 0.3, 1),
                visibility 0.24s cubic-bezier(0.16, 1, 0.3, 1) !important;
  }

  .mobile-more-backdrop.open {
    opacity: 1 !important;
    visibility: visible !important;
    pointer-events: auto !important;
  }

  .mobile-more-sheet {
    display: flex !important;
    flex-direction: column !important;
    position: fixed !important;
    inset-block-end: 0 !important;
    inset-inline: 0 !important;
    z-index: 1130 !important;
    max-height: 84dvh !important;
    background: #FAF7F2 !important;
    border-block-start: 1px solid #E2D9C8 !important;
    border-radius: 22px 22px 0 0 !important;
    box-shadow: 0 -12px 40px rgba(20, 16, 18, 0.22) !important;
    transform: translateY(105%) !important;
    visibility: hidden !important;
    pointer-events: none !important;
    transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1),
                visibility 0.28s cubic-bezier(0.16, 1, 0.3, 1) !important;
    overflow: hidden !important;
  }

  [data-theme="dark"] .mobile-more-sheet,
  [data-theme="kuro-dark"] .mobile-more-sheet {
    background: #1B1924 !important;
    border-block-start-color: rgba(255, 255, 255, 0.1) !important;
    color: #F5F2EB !important;
  }

  .mobile-more-sheet.open {
    transform: translateY(0) !important;
    visibility: visible !important;
    pointer-events: auto !important;
  }

  .mms-handle-bar {
    display: flex;
    justify-content: center;
    padding-block: 10px 4px;
    flex-shrink: 0;
  }

  .mms-handle-bar span {
    width: 40px;
    height: 4px;
    border-radius: 999px;
    background: #D5CBBF;
  }

  .mms-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-block: 6px 12px;
    padding-inline: 18px;
    border-block-end: 1px solid #EAE2D6;
    flex-shrink: 0;
  }

  .mms-header-title-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .mms-brand-img {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    object-fit: contain;
  }

  .mms-title {
    margin: 0;
    font-size: 1rem;
    font-weight: 800;
    color: var(--text-primary, #24181B);
  }

  .mms-close-btn {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    border: 1px solid #E2D9C8;
    background: #FFFFFF;
    color: #24181B;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
  }

  .mms-close-btn svg {
    width: 17px;
    height: 17px;
  }

  .mms-body {
    flex: 1 1 auto;
    overflow-y: auto;
    padding-block: 14px calc(22px + env(safe-area-inset-bottom, 0px));
    padding-inline: 16px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    -webkit-overflow-scrolling: touch;
  }

  .mms-featured-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }

  .mms-featured-card {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 14px;
    border-radius: 14px;
    background: #FFFFFF;
    border: 1px solid #E5DDD0;
    box-shadow: inset 0 1px 0 #FFFFFF, 0 2px 8px rgba(36, 24, 27, 0.04);
    text-decoration: none;
    color: var(--text-primary, #24181B);
  }

  .mms-featured-card.active {
    border-color: #7E1D2A;
    background: #FDF7F7;
  }

  .mms-feat-icon {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: rgba(126, 29, 42, 0.09);
    color: #7E1D2A;
  }

  .mms-feat-icon svg {
    width: 19px;
    height: 19px;
  }

  .mms-feat-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
  }

  .mms-feat-info strong {
    font-size: 0.88rem;
    font-weight: 800;
    line-height: 1.25;
  }

  .mms-feat-info span {
    font-size: 0.72rem;
    color: #756966;
    line-height: 1.3;
  }

  .mms-section-label {
    font-size: 0.68rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: #8A7B78;
    padding-inline: 4px;
    margin-block-end: -6px;
  }

  .mms-links-list {
    display: flex;
    flex-direction: column;
    background: #FFFFFF;
    border: 1px solid #E5DDD0;
    border-radius: 14px;
    overflow: hidden;
  }

  [data-theme="dark"] .mms-featured-card,
  [data-theme="dark"] .mms-links-list,
  [data-theme="kuro-dark"] .mms-featured-card,
  [data-theme="kuro-dark"] .mms-links-list {
    background: #242230;
    border-color: rgba(255, 255, 255, 0.08);
  }

  .mms-list-item {
    display: flex;
    align-items: center;
    gap: 12px;
    min-height: 46px;
    padding: 10px 14px;
    text-decoration: none;
    color: var(--text-primary, #24181B);
    border-block-end: 1px solid #F0EAE1;
    font-size: 0.86rem;
    font-weight: 650;
  }

  .mms-list-item:last-child {
    border-block-end: none;
  }

  .mms-list-item.active {
    background: rgba(126, 29, 42, 0.06);
    color: #7E1D2A;
    font-weight: 750;
  }

  .mms-item-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: #F6F1E8;
    color: #7E1D2A;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
  }

  .mms-item-icon svg {
    width: 16px;
    height: 16px;
  }

  .mms-item-text {
    flex: 1 1 auto;
    min-width: 0;
  }

  .mms-item-arrow {
    width: 16px;
    height: 16px;
    color: #9A8D8A;
    flex-shrink: 0;
  }

  html[dir="rtl"] .mms-item-arrow {
    transform: rotate(180deg);
  }

  .mms-quick-prefs {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
  }

  .mms-pref-pill {
    min-height: 42px;
    padding: 8px 10px;
    border-radius: 11px;
    border: 1px solid #E2D9C8;
    background: #FFFFFF;
    color: var(--text-primary, #24181B);
    font-family: inherit;
    font-size: 0.78rem;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    cursor: pointer;
  }

  .mms-pref-pill svg {
    width: 15px;
    height: 15px;
    color: #7E1D2A;
  }

  /* --------------------------------------------------------------------------
     FLOATING WIDGETS, POPOVERS & MODALS SAFE POSITIONING ON MOBILE
     -------------------------------------------------------------------------- */
  /* Keep Study Rooms Floating Timer ABOVE the Mobile Bottom Navigation Bar */
  .sr-floating-widget {
    inset-block-end: calc(70px + env(safe-area-inset-bottom, 0px)) !important;
    inset-inline-start: 12px !important;
    inset-inline-end: 12px !important;
    max-width: calc(100vw - 24px) !important;
  }

  body.mobile-keyboard-open .sr-floating-widget {
    display: none !important;
  }

  .sr-fw-bar {
    min-width: 0 !important;
    width: 100% !important;
    max-width: 360px !important;
    padding: 8px 12px !important;
    border-radius: 12px !important;
    box-sizing: border-box !important;
  }

  /* Keep Toast messages above Bottom Nav */
  .toast-container,
  #toast-container {
    inset-block-end: calc(74px + env(safe-area-inset-bottom, 0px)) !important;
    max-width: calc(100vw - 24px) !important;
  }

  /* Keep Notifications Popover inside narrow 320px+ screens */
  .notifications-dropdown-panel,
  #notifications-dropdown-panel {
    position: fixed !important;
    top: calc(58px + env(safe-area-inset-top, 0px)) !important;
    inset-inline-start: 10px !important;
    inset-inline-end: 10px !important;
    width: auto !important;
    max-width: calc(100vw - 20px) !important;
    max-height: 76dvh !important;
  }

  /* Modals fit mobile viewport and scroll cleanly when keyboard opens */
  .subject-modal-box,
  .sr-modal,
  .auth-modal-box,
  .dt-completion-card {
    width: calc(100vw - 20px) !important;
    max-width: calc(100vw - 20px) !important;
    max-height: 86dvh !important;
    overflow-y: auto !important;
    box-sizing: border-box !important;
  }
}

/* ============================================================================
   2. SMARTPHONE PORTRAIT LAYOUT (320px <= width <= 599px)
   ============================================================================ */
@media (max-width: 599px) {

  /* Hide Landscape-only bottom nav shortcuts in portrait (accessible via More) */
  .mobile-bottom-item.landscape-extra-item {
    display: none !important;
  }

  /* Expandable Mobile Search Row (Row 2 of Header when .mobile-search-open) */
  .site-header .header-search-box {
    display: none !important;
  }

  .site-header.mobile-search-open .header-search-box {
    display: flex !important;
    align-items: center !important;
    order: 3 !important;
    flex: 0 0 100% !important;
    width: 100% !important;
    max-width: 100% !important;
    position: relative !important;
    margin-block-start: 2px !important;
  }

  .site-header.mobile-search-open .header-search-box input {
    width: 100% !important;
    height: 40px !important;
    min-height: 40px !important;
    font-size: 0.86rem !important;
    padding-inline-start: 36px !important;
    padding-inline-end: 38px !important;
    border-radius: 12px !important;
    background: #FFFFFF !important;
    border: 1px solid #7E1D2A !important;
    box-shadow: 0 0 0 3px rgba(126, 29, 42, 0.10) !important;
  }

  .site-header.mobile-search-open .header-search-box .search-icon {
    width: 15px !important;
    height: 15px !important;
    inset-inline-start: 12px !important;
  }

  .site-header.mobile-search-open .mobile-search-close-btn {
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    position: absolute !important;
    inset-inline-end: 6px !important;
    top: 50% !important;
    transform: translateY(-50%) !important;
    width: 30px !important;
    height: 30px !important;
    border-radius: 8px !important;
    border: none !important;
    background: #F2ECE1 !important;
    color: #5A4E4B !important;
    cursor: pointer !important;
    padding: 0 !important;
  }

  .site-header.mobile-search-open .mobile-search-close-btn svg {
    width: 14px !important;
    height: 14px !important;
  }

  /* Main Page Content Container with Safe Bottom Padding for Bottom Nav */
  .main-content {
    width: 100% !important;
    max-width: 100% !important;
    padding-block-start: 14px !important;
    padding-block-end: calc(86px + env(safe-area-inset-bottom, 0px)) !important;
    padding-inline-start: max(14px, env(safe-area-inset-left, 14px)) !important;
    padding-inline-end: max(14px, env(safe-area-inset-right, 14px)) !important;
    box-sizing: border-box !important;
  }

  .kuro-dashboard-container {
    display: flex !important;
    flex-direction: column !important;
    gap: 14px !important;
  }

  /* --------------------------------------------------------------------------
     PORTRAIT HOME: COMPACT HERO BANNER
     -------------------------------------------------------------------------- */
  .kuro-hero-workspace {
    border-radius: 16px !important;
    margin-block-end: 0 !important;
    border: 1px solid #E5DDD0 !important;
  }

  .kuro-hero-banner {
    height: 126px !important;
    aspect-ratio: unset !important;
  }

  .kuro-hero-bg-img {
    height: 100% !important;
    object-fit: cover !important;
    object-position: 82% center !important;
  }

  .kuro-hero-greeting-overlay {
    width: min(245px, 65%) !important;
    left: 14px !important;
    right: auto !important;
    top: 50% !important;
    transform: translateY(-50%) !important;
  }

  html[dir="ltr"] .kuro-hero-greeting-overlay {
    text-align: left !important;
  }

  html[dir="rtl"] .kuro-hero-greeting-overlay {
    text-align: right !important;
  }

  .kuro-hero-greeting-title {
    font-size: clamp(1.02rem, 4.3vw, 1.2rem) !important;
    line-height: 1.22 !important;
    margin-block-end: 3px !important;
  }

  .kuro-hero-greeting-sub {
    font-size: 0.74rem !important;
    line-height: 1.28 !important;
    margin-block-end: 7px !important;
    display: -webkit-box !important;
    -webkit-line-clamp: 2 !important;
    -webkit-box-orient: vertical !important;
    overflow: hidden !important;
  }

  .kuro-hero-date-chip {
    font-size: 0.70rem !important;
    padding: 3px 10px !important;
    gap: 5px !important;
  }

  /* --------------------------------------------------------------------------
     PORTRAIT HOME: STUDY SUMMARY STRIP (4 Compact Vertical Tiles on 360px–600px)
     -------------------------------------------------------------------------- */
  .kuro-study-summary-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr)) !important;
    gap: 8px !important;
  }

  .kuro-summary-stat-card {
    flex-direction: column !important;
    align-items: center !important;
    justify-content: center !important;
    text-align: center !important;
    gap: 5px !important;
    padding: 10px 6px !important;
    border-radius: 13px !important;
  }

  .kssc-icon-box {
    width: 30px !important;
    height: 30px !important;
    border-radius: 8px !important;
  }

  .kssc-icon-box svg {
    width: 15px !important;
    height: 15px !important;
  }

  .kssc-meta {
    align-items: center !important;
    width: 100% !important;
  }

  .kssc-val {
    font-size: 0.92rem !important;
  }

  .kssc-label {
    font-size: 0.67rem !important;
  }

  /* --------------------------------------------------------------------------
     PORTRAIT HOME: TODAY & TOMORROW SCHEDULE CARDS
     -------------------------------------------------------------------------- */
  .kuro-schedule-split-section {
    margin-block: 0 !important;
  }

  .kuro-schedule-split-grid {
    grid-template-columns: minmax(0, 1fr) !important;
    gap: 12px !important;
  }

  .kuro-split-card {
    padding: 15px !important;
    border-radius: 15px !important;
    min-height: auto !important;
  }

  .kuro-split-card-header {
    margin-block-end: 12px !important;
    padding-block-end: 10px !important;
    flex-wrap: wrap !important;
    gap: 8px !important;
  }

  .kuro-split-card-title {
    font-size: 0.98rem !important;
  }

  .kuro-view-full-schedule-btn {
    min-height: 34px !important;
    padding: 5px 12px !important;
    font-size: 0.75rem !important;
  }

  /* Compact Empty Schedule State (Does not waste half the phone screen) */
  .kuro-empty-day-state {
    padding: 14px 12px !important;
    min-height: auto !important;
  }

  .keds-icon {
    font-size: 1.55rem !important;
    margin-block-end: 4px !important;
  }

  .keds-title {
    font-size: 0.92rem !important;
    margin-block-end: 3px !important;
  }

  .keds-desc {
    font-size: 0.76rem !important;
    line-height: 1.35 !important;
    margin-block-end: 0 !important;
  }

  .keds-action-btn {
    width: 100% !important;
    max-width: 240px !important;
    min-height: 40px !important;
    margin-block-start: 10px !important;
    font-size: 0.8rem !important;
  }

  /* Schedule Lecture Row Cards (Wrapped titles, zero time/hall overlap) */
  .kuro-schedule-row-card {
    padding: 12px 13px !important;
    gap: 10px !important;
    border-radius: 12px !important;
  }

  .ksrc-top {
    flex-wrap: wrap !important;
    row-gap: 4px !important;
    column-gap: 8px !important;
    font-size: 0.75rem !important;
  }

  .ksrc-subject {
    font-size: 0.88rem !important;
    font-weight: 750 !important;
    line-height: 1.35 !important;
    white-space: normal !important;
    display: -webkit-box !important;
    -webkit-line-clamp: 2 !important;
    -webkit-box-orient: vertical !important;
    overflow: hidden !important;
  }

  /* --------------------------------------------------------------------------
     PORTRAIT HOME: CONTINUE STUDYING (1-Column Stack with 44px Touch Buttons)
     -------------------------------------------------------------------------- */
  .kuro-continue-studying-grid {
    grid-template-columns: minmax(0, 1fr) !important;
    gap: 12px !important;
  }

  .continue-study-card {
    flex-direction: column !important;
    align-items: stretch !important;
    padding: 15px 16px !important;
    border-radius: 15px !important;
    min-height: auto !important;
    gap: 12px !important;
  }

  .continue-card-title {
    font-size: 0.96rem !important;
    line-height: 1.35 !important;
    white-space: normal !important;
    display: -webkit-box !important;
    -webkit-line-clamp: 2 !important;
    -webkit-box-orient: vertical !important;
    overflow: hidden !important;
  }

  .continue-action-btn {
    width: 100% !important;
    min-height: 44px !important;
    font-size: 0.85rem !important;
    border-radius: 11px !important;
    justify-content: center !important;
  }

  /* --------------------------------------------------------------------------
     PORTRAIT SECONDARY PAGES: SHEETS, RECORDINGS, QUESTIONS, ROOMS, SCHEDULES
     -------------------------------------------------------------------------- */
  .sheets-subject-grid,
  .sheets-grid-container,
  .audio-subject-grid,
  .audio-sheets-grid,
  .questions-subject-grid,
  .bento-sheet-grid,
  .sr-rooms-grid,
  .schedules-cards-grid {
    grid-template-columns: minmax(0, 1fr) !important;
    gap: 12px !important;
  }

  /* Compact Hero Banners on Recordings, Schedules & Study Rooms */
  .audio-hero-card,
  .schedules-hero-card {
    min-height: 142px !important;
    border-radius: 16px !important;
  }

  .audio-hero-content,
  .schedules-hero-content {
    padding: 18px 16px !important;
  }

  .audio-hero-title,
  .schedules-hero-title {
    font-size: 1.28rem !important;
  }

  /* Recordings Player Controls on Mobile */
  .audio-sub-bar {
    flex-direction: column !important;
    align-items: stretch !important;
    gap: 10px !important;
  }

  .audio-search-box-wrap {
    width: 100% !important;
    max-width: 100% !important;
  }

  .audio-sub-bar-right {
    width: 100% !important;
    justify-content: space-between !important;
  }

  .audio-recording-card {
    padding: 14px !important;
    border-radius: 14px !important;
  }

  .audio-rec-header-row {
    flex-wrap: wrap !important;
    gap: 8px !important;
  }

  .audio-rec-title {
    font-size: 0.94rem !important;
    line-height: 1.35 !important;
    white-space: normal !important;
  }

  .audio-play-circle-btn {
    width: 44px !important;
    height: 44px !important;
    min-width: 44px !important;
    min-height: 44px !important;
    flex-shrink: 0 !important;
  }

  .audio-rec-waveform-container {
    flex: 1 1 auto !important;
    min-width: 0 !important;
    overflow: hidden !important;
  }

  .audio-rec-footer-row {
    flex-wrap: wrap !important;
    gap: 10px !important;
  }

  .audio-rec-actions-group {
    flex-wrap: wrap !important;
    gap: 8px !important;
    width: 100% !important;
    justify-content: flex-end !important;
  }

  /* Questions Runner Mobile Ergonomics */
  #dt-modal-q-title {
    font-size: 1rem !important;
    line-height: 1.5 !important;
    word-break: break-word !important;
  }

  #dt-modal-options-box button,
  .dt-option-btn {
    min-height: 48px !important;
    padding: 12px 14px !important;
    font-size: 0.88rem !important;
    line-height: 1.45 !important;
    white-space: normal !important;
    text-align: start !important;
  }

  #dt-btn-prev,
  #dt-btn-next {
    min-height: 44px !important;
    flex: 1 1 auto !important;
    justify-content: center !important;
  }

  /* Study Rooms Mobile Refinements */
  .sr-tabs-bar {
    overflow-x: auto !important;
    flex-wrap: nowrap !important;
    scrollbar-width: none !important;
    padding-block-end: 4px !important;
  }

  .sr-tabs-bar::-webkit-scrollbar {
    display: none !important;
  }

  .sr-tab-btn {
    white-space: nowrap !important;
    min-height: 40px !important;
    flex-shrink: 0 !important;
  }

  .sr-timer-ring-wrap {
    width: 204px !important;
    height: 204px !important;
  }

  .sr-ring-digits {
    font-size: 2.35rem !important;
  }

  .sr-stage-actions {
    flex-wrap: wrap !important;
    gap: 8px !important;
    width: 100% !important;
  }

  .sr-stage-actions .sr-btn {
    min-height: 42px !important;
    flex: 1 1 auto !important;
    justify-content: center !important;
  }

  /* Schedules Group Selector Pills Scroll Horizontally Without Breaking Page Width */
  .sched-group-pills-row {
    display: flex !important;
    overflow-x: auto !important;
    flex-wrap: nowrap !important;
    gap: 8px !important;
    padding-block-end: 4px !important;
    scrollbar-width: none !important;
  }

  .sched-group-pills-row::-webkit-scrollbar {
    display: none !important;
  }

  .sched-group-pill {
    min-width: 46px !important;
    min-height: 40px !important;
    flex-shrink: 0 !important;
  }
}

/* ============================================================================
   3. ULTRA-NARROW SMARTPHONES (320px <= width <= 359px, e.g., iPhone SE)
   ============================================================================ */
@media (max-width: 359px) {

  .site-header {
    padding-inline: 10px !important;
    gap: 6px !important;
  }

  .header-brand-name {
    font-size: 0.85rem !important;
    max-width: 108px !important;
  }

  .main-content {
    padding-inline: 10px !important;
  }

  .kuro-hero-banner {
    height: 114px !important;
  }

  .kuro-hero-greeting-overlay {
    width: 68% !important;
    left: 10px !important;
  }

  .kuro-hero-greeting-title {
    font-size: 0.96rem !important;
  }

  /* 2 × 2 Grid for Study Summary at 320px–359px so labels never truncate */
  .kuro-study-summary-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
    gap: 8px !important;
  }

  .kuro-summary-stat-card {
    flex-direction: row !important;
    justify-content: flex-start !important;
    text-align: start !important;
    padding: 9px 10px !important;
    gap: 8px !important;
  }

  .kssc-meta {
    align-items: flex-start !important;
  }

  /* Mobile More Sheet Featured Cards Stack on 320px */
  .mms-featured-grid {
    grid-template-columns: minmax(0, 1fr) !important;
  }

  .sr-timer-ring-wrap {
    width: 176px !important;
    height: 176px !important;
  }

  .sr-ring-digits {
    font-size: 2rem !important;
  }
}

/* ============================================================================
   4. SMARTPHONE LANDSCAPE ARCHITECTURE (width <= 960px & height <= 500px)
   Covers: iPhone SE/13/14/16 Pro Max, Galaxy S23/S24/A54, Xiaomi 14, Redmi Note 13
   ============================================================================ */
@media (max-width: 960px) and (max-height: 500px) and (orientation: landscape) {

  /* Compact Single-Row Header with Inline Search Box */
  .site-header {
    min-height: 48px !important;
    padding-block: 5px !important;
    padding-inline-start: max(14px, env(safe-area-inset-left, 14px)) !important;
    padding-inline-end: max(14px, env(safe-area-inset-right, 14px)) !important;
    flex-wrap: nowrap !important;
  }

  .mobile-search-toggle-btn,
  .mobile-search-close-btn {
    display: none !important;
  }

  .header-left-group {
    flex: 0 0 auto !important;
  }

  .header-right-tools {
    flex: 1 1 auto !important;
    justify-content: flex-end !important;
    gap: 8px !important;
    min-width: 0 !important;
  }

  .header-right-tools .header-search-box {
    display: flex !important;
    flex: 1 1 180px !important;
    max-width: 290px !important;
    min-width: 130px !important;
    margin-inline-end: auto !important;
    margin-inline-start: 10px !important;
  }

  .header-right-tools .header-search-box input {
    width: 100% !important;
    height: 34px !important;
    min-height: 34px !important;
    font-size: 0.8rem !important;
    padding-inline-start: 32px !important;
    padding-inline-end: 12px !important;
    border-radius: 9999px !important;
    background: #FFFFFF !important;
    border: 1px solid #E2D9C8 !important;
  }

  .header-right-tools .header-search-box .search-icon {
    width: 14px !important;
    height: 14px !important;
    inset-inline-start: 11px !important;
  }

  /* Compact Landscape Bottom Nav with Direct Rooms & Schedules Tabs */
  .mobile-bottom-nav {
    min-height: 48px !important;
    padding-block-start: 3px !important;
    padding-block-end: max(4px, env(safe-area-inset-bottom, 4px)) !important;
  }

  .mobile-bottom-item {
    min-height: 40px !important;
    flex-direction: row !important;
    gap: 5px !important;
    padding-inline: 6px !important;
  }

  .mobile-bottom-item.landscape-extra-item {
    display: flex !important;
  }

  .mbi-icon-wrap {
    width: 28px !important;
    height: 24px !important;
  }

  .mbi-icon-wrap svg {
    width: 16px !important;
    height: 16px !important;
  }

  .mbi-label {
    font-size: 0.72rem !important;
  }

  /* Landscape Main Content Container */
  .main-content {
    width: 100% !important;
    max-width: 100% !important;
    padding-block-start: 10px !important;
    padding-block-end: calc(68px + env(safe-area-inset-bottom, 0px)) !important;
    padding-inline-start: max(16px, env(safe-area-inset-left, 16px)) !important;
    padding-inline-end: max(16px, env(safe-area-inset-right, 16px)) !important;
    box-sizing: border-box !important;
  }

  .kuro-dashboard-container {
    gap: 12px !important;
  }

  /* Sleek Landscape Hero Banner (Does not crowd short vertical height) */
  .kuro-hero-banner {
    height: 102px !important;
  }

  .kuro-hero-bg-img {
    object-position: 78% center !important;
  }

  .kuro-hero-greeting-overlay {
    width: min(340px, 58%) !important;
    left: 16px !important;
  }

  .kuro-hero-greeting-title {
    font-size: 1.08rem !important;
    margin-block-end: 2px !important;
  }

  .kuro-hero-greeting-sub {
    font-size: 0.74rem !important;
    margin-block-end: 5px !important;
  }

  /* 4-Column Horizontal Study Summary Strip in Landscape */
  .kuro-study-summary-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr)) !important;
    gap: 10px !important;
  }

  .kuro-summary-stat-card {
    flex-direction: row !important;
    padding: 8px 12px !important;
    gap: 9px !important;
  }

  .kssc-icon-box {
    width: 32px !important;
    height: 32px !important;
  }

  .kssc-val {
    font-size: 0.92rem !important;
  }

  /* 2-Column Today & Tomorrow Schedule Split in Landscape (Matches Reference) */
  .kuro-schedule-split-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
    gap: 12px !important;
  }

  .kuro-split-card {
    padding: 12px 14px !important;
    min-height: 150px !important;
  }

  .kuro-empty-day-state {
    padding: 10px 8px !important;
  }

  .keds-icon {
    font-size: 1.35rem !important;
  }

  /* 2-Column Grids for Continue Studying, Sheets, Recordings, Questions, Rooms */
  .kuro-continue-studying-grid,
  .sheets-subject-grid,
  .sheets-grid-container,
  .audio-subject-grid,
  .audio-sheets-grid,
  .questions-subject-grid,
  .bento-sheet-grid,
  .sr-rooms-grid,
  .schedules-cards-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
    gap: 12px !important;
  }

  /* Use Mobile Schedule Cards in Phone Landscape (2-column cards, zero table overflow) */
  .kuro-sched-table-card {
    display: none !important;
  }

  .kuro-sched-mobile-list {
    display: block !important;
  }

  .sched-mobile-cards-stack {
    display: grid !important;
    grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
    gap: 10px !important;
  }

  .sched-mobile-card {
    margin-block-end: 0 !important;
  }

  /* Active Study Room in Landscape: 2-Column Side-by-Side Stage + Sidebar */
  .sr-active-layout {
    display: grid !important;
    grid-template-columns: 1.1fr 0.9fr !important;
    gap: 12px !important;
    align-items: start !important;
  }

  .sr-timer-ring-wrap {
    width: 156px !important;
    height: 156px !important;
  }

  .sr-ring-digits {
    font-size: 1.85rem !important;
  }

  .sr-floating-widget {
    inset-block-end: calc(56px + env(safe-area-inset-bottom, 0px)) !important;
  }
}