/* style.css - Minimalistic, Clean & Premium Light Design */

:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-hover: #f3f4f6;
  --border-color: #e5e7eb;
  --text-main: #111827;
  --text-muted: #6b7280;
  --primary-color: #3b82f6;
  --primary-hover: #2563eb;
  --accent-color: #ec4899;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --sidebar-width: 240px;
  --header-height: 64px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* iOS/Android 오버스크롤 및 모바일 Chrome 하얀 화면 방지 */
html {
  background-color: var(--bg-primary);
  -webkit-text-size-adjust: 100%;
  min-height: 100%;
  overscroll-behavior-y: auto;
}

body {
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  min-height: 100dvh;
  overscroll-behavior-y: auto;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

/* Header Section */
.app-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: #ffffff;
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 1000;
  padding: 0 36px;
  transition: padding 0.2s ease;
}

@media (min-width: 1440px) {
  .app-header {
    padding: 0 64px;
  }
}

@media (min-width: 1920px) {
  .app-header {
    padding: 0 120px;
  }
}

.header-left {
  display: flex;
  align-items: center;
  gap: 16px;
  width: var(--sidebar-width);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 900;
  font-size: 1.1rem;
}

.header-search {
  flex: 1;
  max-width: 540px;
  position: relative;
  margin: 0 20px;
}

.search-input {
  width: 100%;
  padding: 10px 16px 10px 42px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 9999px;
  font-size: 0.9rem;
  color: var(--text-main);
  transition: all 0.2s ease;
}

.search-input:focus {
  outline: none;
  background: #ffffff;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn {
  padding: 8px 16px;
  border-radius: 9999px;
  font-size: 0.9rem;
  font-weight: 600;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-upload {
  background: var(--text-main);
  color: #ffffff;
}

.btn-upload:hover {
  background: #374151;
}

.btn-login {
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.btn-login:hover {
  background: var(--bg-secondary);
}

.btn-signup {
  background: var(--primary-color);
  color: #ffffff;
}

.btn-signup:hover {
  background: var(--primary-hover);
}

/* App Layout */
.app-container {
  display: flex;
  margin-top: var(--header-height);
  min-height: calc(100vh - var(--header-height));
}

/* Sidebar */
.app-sidebar {
  width: var(--sidebar-width);
  background: var(--bg-primary);
  border-right: 1px solid var(--border-color);
  position: fixed;
  top: var(--header-height);
  bottom: 0;
  left: 0;
  padding: 20px 12px;
  overflow-y: auto;
  z-index: 90;
}

.sidebar-menu {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar-item a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  line-height: 1.35;
  color: var(--text-muted);
  transition: all 0.15s ease;
}

.sidebar-item.active a,
.sidebar-item a:hover {
  background: var(--bg-secondary);
  color: var(--primary-color);
  font-weight: 600;
}

.sidebar-divider {
  height: 1px;
  background: var(--border-color);
  margin: 16px 12px;
}

.sidebar-heading {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  padding: 0 16px 8px 16px;
  letter-spacing: 0.5px;
}

/* Main Content Body */
.app-main {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: 0 32px 60px 32px;
}

/* Category Filter Bar */
.category-container {
  margin-top: 0;
  margin-bottom: 20px;
  position: sticky;
  top: var(--header-height);
  background: #ffffff;
  padding: 10px 0;
  z-index: 500;
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.02);
}

.category-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.category-bar::-webkit-scrollbar {
  display: none;
}

.cat-btn {
  padding: 7px 18px;
  border-radius: 9999px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-muted);
  white-space: nowrap;
  transition: all 0.2s ease;
}

.cat-btn:hover {
  background: var(--bg-hover);
  color: var(--text-main);
}

.cat-btn.active {
  background: var(--text-main);
  color: #ffffff;
  border-color: var(--text-main);
  font-weight: 600;
}

/* Grid & Infinite Scroll */
.art-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}

.art-card {
  background: #ffffff;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  display: flex;
  flex-direction: column;
  cursor: pointer;
  position: relative;
}

.art-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.art-image-wrapper {
  position: relative;
  width: 100%;
  padding-top: 125%; /* 4:5 aspect ratio */
  background: var(--bg-secondary);
  overflow: hidden;
}

.art-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.art-card:hover .art-image {
  transform: scale(1.04);
}

.art-info {
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: #ffffff;
}

.art-title {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.art-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.art-artist {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 500;
}

.artist-avatar {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary-color);
  color: white;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  font-weight: bold;
}

/* TOP Popular Creators List Styles */
.popular-creators-list {
  list-style: none;
  padding: 0;
  margin: 6px 0 12px 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.creator-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.1s ease;
}

.creator-item:hover {
  background: var(--bg-hover, rgba(0, 0, 0, 0.04));
  transform: translateX(2px);
}

.creator-rank {
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--text-muted);
  width: 16px;
  text-align: center;
}

.creator-rank.rank-1 { color: #f59e0b; }
.creator-rank.rank-2 { color: #94a3b8; }
.creator-rank.rank-3 { color: #b45309; }

.creator-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.creator-info {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.creator-name {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.creator-stats {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 1px;
}

.art-stats {
  display: flex;
  align-items: center;
  gap: 10px;
}

.stat-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Loader & Status */
.loading-indicator {
  text-align: center;
  padding: 40px 0;
  color: var(--text-muted);
  font-size: 0.9rem;
  grid-column: 1 / -1;
}

.spinner {
  display: inline-block;
  width: 24px;
  height: 24px;
  border: 3px solid rgba(0,0,0,0.1);
  border-radius: 50%;
  border-top-color: var(--primary-color);
  animation: spin 0.8s linear infinite;
  margin-bottom: 8px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.no-more-msg {
  text-align: center;
  padding: 40px 0;
  color: var(--text-muted);
  font-size: 0.9rem;
  grid-column: 1 / -1;
}

/* Modal Windows */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 10000;
  display: none;
  visibility: hidden;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

.modal-overlay.open {
  display: flex !important;
  visibility: visible !important;
  opacity: 1 !important;
  pointer-events: auto !important;
}

.modal-overlay.open .modal-card,
.modal-overlay.open .modal-card * {
  pointer-events: auto !important;
}

/* Disable Category Bar, Controls & Sidebar when any Modal is Active */
body.modal-open-no-scroll .category-container,
body.modal-open-no-scroll .category-bar,
body.modal-open-no-scroll .app-header,
body.modal-open-no-scroll .app-sidebar {
  pointer-events: none !important;
}

body.modal-open-no-scroll .modal-overlay {
  pointer-events: auto !important;
}

.modal-card {
  background: #ffffff;
  border-radius: var(--radius-lg);
  max-width: 900px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: var(--shadow-lg);
  transform: scale(0.95);
  transition: transform 0.25s ease;
}

.modal-overlay.open .modal-card {
  transform: scale(1);
}

.modal-close {
  position: absolute;
  top: 18px;
  right: 18px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: #1e293b;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 100;
  font-size: 1.4rem;
  font-weight: 700;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
  transition: all 0.2s ease;
}

.modal-close:hover {
  background: #0f172a;
  transform: scale(1.05);
}

/* Detail View Layout */
.detail-body {
  display: grid;
  grid-template-columns: 1fr 320px;
}

.detail-img-box {
  background: #111827;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  min-height: 400px;
}

.detail-img-box img {
  max-width: 100%;
  max-height: 75vh;
  object-fit: contain;
  border-radius: 4px;
}

.detail-side-info {
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

/* Form Styling */
.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-main);
}

.form-input, .form-select {
  width: 100%;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  font-size: 0.9rem;
  background: #ffffff;
}

.form-input:focus, .form-select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.12);
}

/* Responsive adjustments */
@media (max-width: 900px) {
  /* 햄버거 네비게이션 버튼 표시 */
  .mobile-menu-btn {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  /* 데스크톱 검색창 숨김, 모바일 검색 버튼 표시 */
  .header-search {
    display: none;
  }
  .mobile-search-btn {
    display: flex !important;
  }

  /* 사이드바를 드로어(슬라이드) 방식으로 전환 */
  .app-sidebar {
    position: fixed;
    top: var(--header-height);
    left: -300px;
    bottom: 0;
    width: 270px;
    height: calc(100vh - var(--header-height));
    background: #ffffff;
    z-index: 9999;
    box-shadow: 6px 0 24px rgba(0, 0, 0, 0.2);
    transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
    padding: 22px 18px 30px 18px;
    display: block;
    border-top: 1px solid var(--border-color);
    border-right: 1px solid var(--border-color);
    box-sizing: border-box;
    margin-top: 0;
  }

  .app-sidebar.mobile-open {
    left: 0;
  }

  .app-main {
    margin-left: 0;
    padding: 20px 16px 60px 16px;
  }
  .header-left {
    width: auto;
  }
  .detail-body {
    grid-template-columns: 1fr;
  }
}

/* QR Code Analyzer Styling */
.kbd-badge {
  background: var(--bg-hover);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 2px 6px;
  font-family: inherit;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-main);
  box-shadow: 0 1px 1px rgba(0,0,0,0.1);
}

.qr-drop-zone {
  width: 100%;
  min-height: 200px;
  border: 2px dashed #93c5fd;
  border-radius: var(--radius-md);
  background: #f0f7ff;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  transition: all 0.2s ease;
  cursor: pointer;
}

.qr-drop-zone:hover, .qr-drop-zone.dragover {
  border-color: var(--primary-color);
  background: #e0f2fe;
}

.qr-drop-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.qr-icon-circle {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: #ffffff;
  color: var(--primary-color);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
  box-shadow: var(--shadow-sm);
}

.qr-result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.qr-status-badge {
  padding: 4px 12px;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 700;
}

.qr-status-badge.success {
  background: #dcfce7;
  color: #166534;
}

.qr-status-badge.error {
  background: #fee2e2;
  color: #991b1b;
}

.qr-type-badge {
  background: var(--bg-hover);
  color: var(--text-main);
  padding: 4px 12px;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 600;
  border: 1px solid var(--border-color);
}

.qr-content-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-bottom: 16px;
}

.qr-decoded-text {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.95rem;
  word-break: break-all;
  color: var(--text-main);
  background: #ffffff;
  padding: 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  max-height: 120px;
  overflow-y: auto;
}

.qr-spec-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.qr-spec-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 12px;
  text-align: center;
}

.qr-spec-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 4px;
}

.qr-spec-value {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--text-main);
}

@media (max-width: 600px) {
  .qr-spec-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* User Profile & Google Login Styles */
.user-profile-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px 4px 6px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
}

.user-avatar-img {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border-color);
}

.user-avatar-text {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--primary-color);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
}

.btn-google-custom:hover {
  background-color: #f8f9fa !important;
  border-color: #c6c9ce !important;
  box-shadow: 0 2px 6px rgba(0,0,0,0.12) !important;
}

/* Mobile Responsive Web Design Overhaul */
.mobile-menu-btn {
  display: none;
  font-size: 1.3rem;
  padding: 6px 10px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  cursor: pointer;
  margin-right: 6px;
}

.mobile-sidebar-backdrop {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: 9998;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.mobile-sidebar-backdrop.active {
  display: block;
  opacity: 1;
  pointer-events: auto;
}

@media (max-width: 992px) {
  .app-header {
    padding: 0 16px;
  }
  .header-left {
    width: auto;
  }
  .header-search {
    margin: 0 10px;
    max-width: 320px;
  }
}

/* Body Scroll Lock & Overscroll Isolation for Mobile Sidebar & Modals */
body.sidebar-open-no-scroll {
  overflow: hidden !important;
  touch-action: none !important;
}

body.modal-open-no-scroll {
  overflow: hidden !important;
}

.modal-overlay {
  overscroll-behavior: contain !important;
  -webkit-overflow-scrolling: touch !important;
  touch-action: pan-y !important;
}

.modal-container,
.modal-card,
.modal-content {
  overscroll-behavior: contain !important;
  -webkit-overflow-scrolling: touch !important;
  touch-action: pan-y !important;
  overflow-y: auto !important;
}

@media (max-width: 768px) {
  .mobile-menu-btn {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  /* High Visibility Mobile Drawer Sidebar (Zero Top Gap & Containment) */
  .app-sidebar {
    position: fixed !important;
    top: 56px !important;
    left: -300px !important;
    bottom: 0 !important;
    width: 270px !important;
    height: calc(100vh - 56px) !important;
    background: #ffffff !important;
    z-index: 9999 !important;
    box-shadow: 6px 0 24px rgba(0, 0, 0, 0.2) !important;
    transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
    overflow-y: auto !important;
    -webkit-overflow-scrolling: touch !important;
    overscroll-behavior: contain !important;
    padding: 22px 18px 30px 18px !important;
    margin-top: 0 !important;
    display: block !important;
    border-top: 1px solid var(--border-color) !important;
    border-right: 1px solid var(--border-color) !important;
    box-sizing: border-box !important;
  }

  .app-sidebar.mobile-open {
    left: 0 !important;
  }

  .sidebar-menu {
    display: flex !important;
    flex-direction: column !important;
    gap: 8px !important;
  }

  .sidebar-item a {
    color: #1e293b !important;
    font-size: 0.92rem !important;
    font-weight: 600 !important;
    padding: 12px 16px !important;
    border-radius: var(--radius-sm) !important;
    background: #f8fafc !important;
    border: 1px solid #e2e8f0 !important;
    display: flex !important;
    align-items: center !important;
    gap: 10px !important;
  }

  .sidebar-item.active a {
    background: #eff6ff !important;
    color: var(--primary-color) !important;
    border-color: #bfdbfe !important;
  }

  /* Seamless App Main & Category Bar (Zero Gap) */
  .app-header {
    height: 56px !important;
  }

  .app-container {
    margin-top: 56px !important;
  }

  .app-main {
    margin-left: 0 !important;
    padding: 0 16px 60px 16px !important;
    width: 100% !important;
  }

  .category-container {
    margin-top: 0 !important;
    margin-bottom: 16px !important;
    padding: 8px 0 !important;
    position: sticky !important;
    top: 56px !important;
    background: #ffffff !important;
    border-bottom: 1px solid var(--border-color) !important;
    border-top: none !important;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.03) !important;
    z-index: 500 !important;
  }

  .header-search {
    display: none !important;
  }

  .mobile-search-btn {
    display: flex !important;
  }

  .header-right {
    gap: 6px;
  }

  /* Compact Header Action Buttons */
  .header-right .btn,
  .header-right .btn-login,
  .header-right .btn-signup,
  .header-right .btn-upload,
  .header-right #btn-header-admin {
    padding: 4px 9px !important;
    font-size: 0.72rem !important;
    font-weight: 700 !important;
  }

  #user-profile-bar {
    gap: 4px !important;
  }

  #user-name-display {
    display: none;
  }

  .cat-bar {
    overflow-x: auto;
    white-space: nowrap;
    padding-bottom: 4px;
    -webkit-overflow-scrolling: touch;
    display: flex;
    gap: 6px;
  }

  .cat-btn {
    flex: 0 0 auto;
    padding: 6px 12px;
    font-size: 0.8rem;
  }

  .art-grid {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)) !important;
    gap: 10px !important;
  }

  .art-card-img {
    height: 160px !important;
  }

  .art-card-title {
    font-size: 0.85rem !important;
  }

  /* Modal Mobile Responsive */
  .modal-overlay {
    padding: 8px !important;
    align-items: center !important;
    justify-content: center !important;
  }

  .modal-container, .modal-card {
    width: 95% !important;
    max-width: 95vw !important;
    max-height: 85vh !important;
    margin: 0 auto !important;
    padding: 18px 14px !important;
    border-radius: 16px !important;
    overflow-y: auto !important;
    box-sizing: border-box !important;
    -webkit-overflow-scrolling: touch !important;
  }

  .modal-close {
    top: 12px !important;
    right: 14px !important;
    width: 36px !important;
    height: 36px !important;
    font-size: 1.8rem !important;
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
  }

  /* Prevent auto zoom-in on mobile inputs (Font >= 16px) */
  input[type="text"],
  input[type="url"],
  input[type="number"],
  input[type="email"],
  input[type="password"],
  input[type="file"],
  select,
  textarea {
    font-size: 16px !important;
    touch-action: manipulation;
  }

  button, a, .btn, .btn-action, .cat-btn {
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
  }
}

@media (max-width: 480px) {
  .app-header {
    height: 56px !important;
    padding: 0 10px !important;
  }

  .app-container {
    margin-top: 56px !important;
  }

  .app-sidebar {
    top: 56px !important;
    margin-top: 0 !important;
  }

  .category-container {
    top: 56px !important;
    margin-top: 0 !important;
    padding: 6px 0 !important;
  }

  .logo img {
    height: 26px !important;
  }

  .header-search {
    display: none !important;
  }

  .header-right {
    gap: 4px !important;
  }

  .header-right .btn,
  .header-right .btn-login,
  .header-right .btn-signup,
  .header-right .btn-upload,
  .header-right #btn-header-admin {
    padding: 5px 8px !important;
    font-size: 0.75rem !important;
    border-radius: 8px !important;
  }

  .art-grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 10px !important;
  }

  .art-card {
    height: 250px !important;
    display: flex !important;
    flex-direction: column !important;
  }

  .art-card-img {
    height: 115px !important;
    object-fit: cover !important;
  }

  .qr-spec-grid {
    grid-template-columns: repeat(1, 1fr) !important;
  }

  .action-bar {
    flex-direction: column;
    width: 100%;
    gap: 8px !important;
  }

  .action-bar .btn-action {
    width: 100%;
    justify-content: center;
    padding: 12px 0 !important;
  }

  .mypage-card, .admin-card-section {
    padding: 16px !important;
    border-radius: 14px !important;
  }

  .stats-grid {
    grid-template-columns: repeat(1, 1fr) !important;
    gap: 10px !important;
  }

  /* Index.php 메인 화면 모바일 최적화 */
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 10px !important;
  }

  .feature-grid {
    grid-template-columns: 1fr !important;
    gap: 14px !important;
  }

  .code-guide-grid {
    grid-template-columns: 1fr !important;
    gap: 10px !important;
  }
}

/* ==========================================================================
   모바일 데스크탑 모드 안내 배너
   ========================================================================== */
.mobile-desktop-notice {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 9995;
  pointer-events: none;
  transform: translateY(105%);
  transition: transform 0.38s cubic-bezier(0.4, 0, 0.2, 1);
  background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 60%, #1d4ed8 100%);
  color: #ffffff;
  border-radius: 20px 20px 0 0;
  box-shadow: 0 -8px 32px rgba(0, 0, 0, 0.3), 0 -2px 8px rgba(29, 78, 216, 0.4);
  padding: 0;
  border-top: 2px solid rgba(99, 102, 241, 0.5);
  /* Android 내비게이션바(safe area) 영역 확보 */
  padding-bottom: env(safe-area-inset-bottom, 0px);
  /* Chrome Android GPU 레이어 안정화 */
  will-change: transform;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}

.mobile-desktop-notice.mdn-show {
  transform: translateY(0);
  pointer-events: auto;
}

body.modal-open-no-scroll .mobile-desktop-notice {
  pointer-events: none !important;
  z-index: 9990 !important;
}

.mdn-inner {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 18px 18px 14px 18px;
}

.mdn-icon {
  font-size: 1.8rem;
  line-height: 1;
  flex-shrink: 0;
  margin-top: 2px;
}

.mdn-body {
  flex: 1;
  min-width: 0;
}

.mdn-title {
  font-size: 0.95rem;
  font-weight: 900;
  color: #ffffff;
  margin-bottom: 5px;
  letter-spacing: -0.2px;
}

.mdn-desc {
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.78);
  line-height: 1.55;
  margin-bottom: 12px;
}

.mdn-steps {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.mdn-step {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.9);
  line-height: 1.4;
}

.mdn-step strong {
  color: #93c5fd;
  font-weight: 800;
}

.mdn-step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(99, 102, 241, 0.7);
  color: #ffffff;
  font-size: 0.7rem;
  font-weight: 800;
  flex-shrink: 0;
  border: 1px solid rgba(147, 197, 253, 0.4);
}

.mdn-close {
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
  margin-top: 0;
}

.mdn-close:hover {
  background: rgba(255, 255, 255, 0.22);
  color: #ffffff;
}

.mdn-footer {
  padding: 11px 18px 0 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  /* safe area inset 포함 하단 패딩 (Android 내비게이션바 가림 방지) */
  padding-bottom: calc(16px + env(safe-area-inset-bottom, 12px));
}

.mdn-dismiss {
  width: 100%;
  padding: 9px 0;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 10px;
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: inherit;
  letter-spacing: -0.1px;
}

.mdn-dismiss:hover,
.mdn-dismiss:active {
  background: rgba(255, 255, 255, 0.2);
  color: #ffffff;
}

/* 이미 데스크탑 모드(1024px 이상)일 경우 숨김 */
@media (min-width: 1024px) {
  .mobile-desktop-notice {
    display: none !important;
  }
}

/* Code Mode Tab Styling */
.btn-code-tab {
  background: transparent;
  color: #64748b;
  transition: all 0.2s ease;
}

.btn-code-tab:hover {
  color: #1e293b;
  background: rgba(255, 255, 255, 0.5);
}

.btn-code-tab.active {
  background: #ffffff !important;
  color: #4f46e5 !important;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.08);
}

/* QR Code Generate Button High-Visibility Styling */
.btn-qr-generate {
  font-weight: 900 !important;
  font-size: 1rem !important;
  border: 2.5px solid #3730a3 !important;
  background: linear-gradient(135deg, #4f46e5 0%, #4338ca 100%) !important;
  color: #ffffff !important;
  border-radius: 12px !important;
  box-shadow: 0 4px 14px rgba(79, 70, 229, 0.4) !important;
  cursor: pointer !important;
  transition: all 0.2s ease !important;
}

.btn-qr-generate:hover {
  transform: translateY(-2px);
  background: linear-gradient(135deg, #4338ca 0%, #3730a3 100%) !important;
  border-color: #312e81 !important;
  box-shadow: 0 6px 20px rgba(79, 70, 229, 0.55) !important;
}

.btn-qr-generate:active {
  transform: translateY(1px);
  box-shadow: 0 2px 8px rgba(79, 70, 229, 0.3) !important;
}

/* =============================================
   Mobile Search Button & Overlay
   ============================================= */
.mobile-search-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.mobile-search-btn:hover,
.mobile-search-btn:active {
  background: var(--primary-color);
  color: #ffffff;
  border-color: var(--primary-color);
}

/* 검색 오버레이 풀스크린 */
.mobile-search-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 10000;
  background: rgba(15, 23, 42, 0.55);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  align-items: flex-start;
  justify-content: center;
  padding-top: 0;
  opacity: 0;
  transition: opacity 0.22s ease;
}

.mobile-search-overlay.open {
  display: flex;
  opacity: 1;
}

.mobile-search-overlay-inner {
  width: 100%;
  background: #ffffff;
  padding: 12px 14px 16px 14px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.18);
  transform: translateY(-20px);
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  border-bottom: 1px solid var(--border-color);
}

.mobile-search-overlay.open .mobile-search-overlay-inner {
  transform: translateY(0);
}

.mobile-search-overlay-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.mobile-search-overlay-label {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-muted);
  flex: 1;
}

.mobile-search-overlay-close {
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background: transparent;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 1.1rem;
  line-height: 1;
  transition: all 0.15s ease;
}

.mobile-search-overlay-close:hover {
  background: #f1f5f9;
  color: var(--text-main);
}

.mobile-search-overlay-input-wrap {
  position: relative;
}

.mobile-search-overlay-input-wrap .search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

#mobile-search-input {
  width: 100%;
  box-sizing: border-box;
  padding: 11px 16px 11px 44px;
  background: var(--bg-secondary);
  border: 1.5px solid var(--border-color);
  border-radius: 9999px;
  font-size: 0.95rem;
  color: var(--text-main);
  transition: all 0.2s ease;
}

#mobile-search-input:focus {
  outline: none;
  background: #ffffff;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

/* ==========================================================================
   Custom Styled Login & Logout Modals
   ========================================================================== */
.modal-auth-card {
  max-width: 440px;
  width: 92%;
  padding: 32px 28px;
  border-radius: 24px;
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.18), 0 4px 16px rgba(0, 0, 0, 0.08);
  position: relative;
  overflow: auto;
  border: 1px solid rgba(226, 232, 240, 0.8);
}

.modal-login-style {
  background: #ffffff;
  border-top: 5px solid #6366f1;
}

.modal-logout-style {
  background: #ffffff;
  border-top: 5px solid #f43f5e;
}

.auth-modal-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  margin-bottom: 20px;
}

.auth-badge-icon {
  width: 60px;
  height: 60px;
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.85rem;
  margin-bottom: 14px;
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.06);
}

.login-badge {
  background: linear-gradient(135deg, #e0e7ff 0%, #e0f2fe 100%);
  color: #4f46e5;
  border: 1.5px solid #c7d2fe;
}

.logout-badge {
  background: linear-gradient(135deg, #ffe4e6 0%, #ffedd5 100%);
  color: #e11d48;
  border: 1.5px solid #fecdd3;
}

.auth-subtag {
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 1px;
  color: #6366f1;
  background: #f5f3ff;
  padding: 4px 12px;
  border-radius: 12px;
  margin-bottom: 8px;
}

.logout-subtag {
  color: #e11d48;
  background: #fff1f2;
}

.auth-modal-title {
  font-size: 1.35rem;
  font-weight: 900;
  color: var(--text-main);
  margin-bottom: 6px;
  letter-spacing: -0.3px;
}

.auth-modal-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin: 0;
}

.social-login-box {
  display: flex;
  justify-content: center;
  width: 100%;
  margin: 16px 0 12px 0;
  background: #f8fafc;
  padding: 14px;
  border-radius: 16px;
  border: 1px solid #e2e8f0;
}

.auth-divider {
  display: flex;
  align-items: center;
  text-align: center;
  margin: 14px 0;
  color: #94a3b8;
  font-size: 0.78rem;
  font-weight: 600;
}

.auth-divider::before,
.auth-divider::after {
  content: '';
  flex: 1;
  border-bottom: 1px solid #e2e8f0;
}

.auth-divider span {
  padding: 0 12px;
}

.btn-auth-primary {
  width: 100%;
  padding: 13px 0;
  font-size: 0.9rem;
  font-weight: 800;
  border-radius: 14px;
  border: none;
  cursor: pointer;
  transition: all 0.25s ease;
}



.auth-feature-list {
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.feature-tag {
  font-size: 0.72rem;
  font-weight: 700;
  color: #475569;
  background: #f1f5f9;
  padding: 4px 10px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  gap: 4px;
}

.auth-modal-footer {
  margin-top: 20px;
  border-top: 1px solid #f1f5f9;
  padding-top: 16px;
  width: 100%;
  text-align: center;
}

.btn-auth-guest {
  width: 100%;
  background: transparent;
  border: none;
  color: #64748b;
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  padding: 8px;
  text-align: center;
  transition: color 0.15s ease;
}

.btn-auth-guest:hover {
  color: #1e293b;
}

.logout-profile-card {
  background: linear-gradient(135deg, #fff5f5 0%, #fff0f6 100%);
  border: 1px solid #fecdd3;
  border-radius: 16px;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 16px 0 20px 0;
  text-align: left;
  position: relative;
}

.logout-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid #ffffff;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.08);
}

.logout-user-info {
  flex: 1;
  overflow: hidden;
}

.logout-name {
  font-weight: 800;
  font-size: 0.95rem;
  color: #1e293b;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.logout-email {
  font-size: 0.78rem;
  color: #64748b;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.session-badge {
  font-size: 0.68rem;
  font-weight: 800;
  color: #059669;
  background: #d1fae5;
  padding: 3px 8px;
  border-radius: 10px;
}

.dual-buttons {
  display: flex;
  gap: 10px;
  border-top: none;
  padding-top: 0;
}

.btn-auth-danger {
  flex: 1;
  background: linear-gradient(135deg, #f43f5e 0%, #e11d48 100%);
  color: #ffffff;
  font-weight: 800;
  font-size: 0.88rem;
  padding: 12px 0;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 6px 16px rgba(225, 29, 72, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.btn-auth-danger:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(225, 29, 72, 0.4);
}

.btn-auth-secondary {
  flex: 1;
  background: #f1f5f9;
  color: #475569;
  font-weight: 800;
  font-size: 0.88rem;
  padding: 12px 0;
  border-radius: 12px;
  border: 1px solid #cbd5e1;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.btn-auth-secondary:hover {
  background: #e2e8f0;
  color: #1e293b;
}

/* =======================================================
   Android & iOS Mobile Rendering & White Screen Fix Block
   ======================================================= */
@media (max-width: 768px) {
  html, body {
    width: 100% !important;
    max-width: 100vw !important;
    overflow-x: hidden !important;
    background-color: #ffffff !important;
    -webkit-overflow-scrolling: touch !important;
  }

  .app-container {
    width: 100% !important;
    max-width: 100vw !important;
    overflow-x: hidden !important;
    box-sizing: border-box !important;
    min-height: calc(100vh - 56px) !important;
    min-height: calc(100dvh - 56px) !important;
  }

  .app-main {
    width: 100% !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
    overflow-x: hidden !important;
    padding-left: 12px !important;
    padding-right: 12px !important;
  }

  /* Prevent grid overflow on small devices */
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 8px !important;
  }
}

@media (max-width: 480px) {
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 8px !important;
  }
}