/* VARIABLES & ROOT DESIGN SYSTEM */
:root {
  --font-display: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  /* Colors */
  --bg-app: #f4f6fc;
  --bg-card: #ffffff;
  
  --primary: hsl(224, 76%, 48%);
  --primary-hover: hsl(224, 76%, 40%);
  --primary-light: hsl(224, 76%, 95%);
  
  --dark-indigo: hsl(222, 47%, 11%);
  --dark-indigo-hover: hsl(222, 47%, 18%);
  
  --success: hsl(142, 72%, 29%);
  --success-light: hsl(142, 72%, 95%);
  --danger: hsl(346, 84%, 61%);
  --danger-hover: hsl(346, 84%, 50%);
  --danger-light: hsl(346, 84%, 97%);
  
  --text-main: hsl(215, 28%, 17%);
  --text-muted: hsl(215, 16%, 47%);
  --text-light: hsl(210, 40%, 98%);
  
  --border-color: hsl(220, 15%, 88%);
  --border-focus: hsl(224, 76%, 70%);
  
  /* Shadows & Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.12);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: var(--font-body);
  background-color: var(--bg-app);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--dark-indigo);
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

button, input, textarea {
  font-family: inherit;
  outline: none;
}

/* APP LAYOUT */
.app-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* NAVBAR MODE TOGGLE BUTTON */
.mode-toggle-btn.static-mode-btn {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.78rem;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: none;
}

.mode-toggle-btn.static-mode-btn.view-mode {
  background-color: transparent;
  border: 1px solid var(--primary);
  color: var(--primary);
}

.mode-toggle-btn.static-mode-btn.view-mode:hover {
  background-color: var(--primary-light);
  transform: translateY(-1px);
}

.mode-toggle-btn.static-mode-btn.edit-mode {
  background-color: var(--success-light);
  border: 1px solid var(--success);
  color: var(--success);
}

.mode-toggle-btn.static-mode-btn.edit-mode:hover {
  background-color: var(--success);
  color: #fff;
  transform: translateY(-1px);
}

.mode-toggle-btn.static-mode-btn:active {
  transform: translateY(0);
}

.icon-container {
  display: flex;
  align-items: center;
  justify-content: center;
}

/* HEADER STYLE */
.main-header {
  background-color: hsl(220, 25%, 97%);
  color: var(--text-main);
  padding: 16px 0;
  box-shadow: var(--shadow-sm);
  border-bottom: 1px solid var(--border-color);
  position: relative;
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  background-color: var(--primary);
  color: #fff;
  padding: 8px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-text-group {
  display: flex;
  flex-direction: column;
}

.school-name {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--dark-indigo);
  letter-spacing: -0.5px;
}

.school-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 400;
}

.contact-info {
  display: flex;
  align-items: center;
  gap: 16px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--text-main);
  opacity: 0.8;
}

.contact-item:hover {
  opacity: 1;
  color: var(--primary);
}

/* MAIN BODY & COLUMNS */
.main-body {
  flex: 1;
  padding: 40px 0;
}

.layout-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 30px;
  align-items: start;
}

/* SIDEBAR PANEL */
.sidebar-panel {
  background-color: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
}

.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.sidebar-header h3 {
  font-size: 1.2rem;
  font-weight: 700;
}

/* Categories List */
.categories-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nav-loading {
  text-align: center;
  color: var(--text-muted);
  padding: 20px 0;
  font-size: 0.9rem;
}

.category-group {
  display: flex;
  flex-direction: column;
  background-color: var(--bg-app);
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid transparent;
  transition: var(--transition);
}

.category-group.open {
  border-color: var(--border-color);
}

.category-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: #fff;
  padding: 12px 16px;
  cursor: pointer;
  user-select: none;
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--dark-indigo);
  transition: var(--transition);
  font-size: 0.95rem;
}

.category-header-row:hover {
  background-color: var(--primary-light);
}

.category-title-text {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
}

.category-chevron {
  transition: var(--transition);
}

.category-group.open .category-chevron {
  transform: rotate(90deg);
}

/* Subcategory List */
.subcategories-list {
  display: none;
  padding: 4px 0 8px 0;
  background-color: var(--bg-card);
  flex-direction: column;
  gap: 2px;
}

.category-group.open .subcategories-list {
  display: flex;
}

.subcategory-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px 10px 32px;
  font-size: 0.9rem;
  color: var(--text-muted);
  border-left: 3px solid transparent;
  cursor: pointer;
  transition: var(--transition);
}

.subcategory-item:hover {
  color: var(--primary);
  background-color: var(--primary-light);
}

.subcategory-item.active {
  color: var(--primary);
  background-color: var(--primary-light);
  border-left-color: var(--primary);
  font-weight: 600;
}

/* CONTENT PANEL */
.content-panel {
  background-color: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 40px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  min-height: 500px;
  position: relative;
}

.content-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--text-muted);
  padding: 100px 0;
}

.content-placeholder p {
  max-width: 320px;
  font-size: 0.95rem;
}

/* Subcategory content presentation */
.subcategory-content {
  animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(5px); }
  to { opacity: 1; transform: translateY(0); }
}

.content-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
  gap: 15px;
}

.breadcrumbs {
  font-size: 0.85rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.breadcrumbs .separator {
  opacity: 0.5;
}

.breadcrumbs .active {
  color: var(--primary);
  font-weight: 500;
}

.content-title {
  font-size: 2rem;
  margin-bottom: 20px;
  line-height: 1.3;
}

.content-text {
  font-size: 1.05rem;
  color: hsl(215, 28%, 25%);
  margin-bottom: 40px;
  white-space: pre-line;
}

/* FILES SECTION */
.files-section {
  border-top: 1px solid var(--border-color);
  padding-top: 30px;
}

.files-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.files-header h3 {
  font-size: 1.25rem;
  font-weight: 700;
}

.files-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.file-card {
  display: flex;
  align-items: center;
  gap: 16px;
  background-color: var(--bg-app);
  padding: 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.file-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
  border-color: var(--border-focus);
}

.file-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px;
  border-radius: var(--radius-sm);
  color: #fff;
}

.file-icon.pdf {
  background-color: var(--danger);
}

.file-icon.jpg {
  background-color: hsl(36, 100%, 45%);
}

.file-icon.generic {
  background-color: var(--primary);
}

.file-details {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.file-name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--dark-indigo);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-size {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.file-action-btns {
  display: flex;
  gap: 8px;
}

.file-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 6px;
  border-radius: 50%;
  color: var(--text-muted);
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.file-btn:hover {
  background-color: var(--border-color);
  color: var(--primary);
}

.file-btn.delete-file-btn:hover {
  background-color: var(--danger-light);
  color: var(--danger);
}

/* FOOTER STYLE */
.main-footer {
  background-color: hsl(220, 20%, 94%);
  color: var(--text-main);
  padding: 40px 0;
  margin-top: auto;
  border-top: 1px solid var(--border-color);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 30px;
}

.footer-left {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links {
  display: flex;
  gap: 20px;
  font-size: 0.85rem;
  opacity: 0.8;
}

.footer-links a:hover {
  opacity: 1;
  color: var(--primary);
}

.footer-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 12px;
}

.social-links {
  display: flex;
  align-items: center;
  gap: 12px;
}

.social-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.social-icons {
  display: flex;
  gap: 10px;
}

.social-icon-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--border-color);
  color: var(--text-main);
  transition: var(--transition);
}

.social-icon-btn:hover {
  background-color: var(--primary);
  color: #fff;
  transform: translateY(-2px);
}

.social-icon-btn.vk:hover {
  background-color: #4c75a3;
  color: #fff;
}

.social-icon-btn.telegram:hover {
  background-color: #0088cc;
  color: #fff;
}

.social-icon-btn.youtube:hover {
  background-color: #ff0000;
  color: #fff;
}

/* BUTTONS */
.action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9rem;
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.action-btn.primary {
  background-color: var(--primary);
  color: #fff;
}

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

.action-btn.outline {
  background-color: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-main);
}

.action-btn.outline:hover {
  background-color: var(--bg-app);
}

.action-btn.danger {
  background-color: var(--danger-light);
  color: var(--danger);
  border: 1px solid var(--danger-light);
}

.action-btn.danger:hover {
  background-color: var(--danger);
  color: #fff;
}

.action-btn.small {
  padding: 8px 14px;
  font-size: 0.8rem;
  border-radius: 6px;
}

/* ADMIN STYLING & TOGGLE CONTROLS */
.admin-action-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  font-size: 0.8rem;
  font-family: var(--font-display);
  font-weight: 600;
  border-radius: 6px;
  background-color: var(--primary-light);
  color: var(--primary);
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.admin-action-btn:hover {
  background-color: var(--primary);
  color: #fff;
}

.admin-edit-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  font-size: 0.75rem;
  font-family: var(--font-display);
  font-weight: 600;
  background-color: var(--primary-light);
  color: var(--primary);
  border: 1px solid var(--primary-light);
  border-radius: 6px;
  cursor: pointer;
  margin-top: 0;
  transition: var(--transition);
}

.admin-edit-btn:hover {
  background-color: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.category-admin-actions, .subcategory-admin-actions {
  display: flex;
  gap: 4px;
  opacity: 0.3;
  transition: var(--transition);
}

.category-header-row:hover .category-admin-actions,
.subcategory-item:hover .subcategory-admin-actions {
  opacity: 1;
}

.mini-admin-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.mini-admin-btn:hover {
  background-color: var(--border-color);
  color: var(--primary);
}

.mini-admin-btn.danger:hover {
  background-color: var(--danger-light);
  color: var(--danger);
}

/* FILE UPLOAD & LOADER */
.upload-progress {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  background-color: var(--primary-light);
  color: var(--primary);
  border-radius: var(--radius-md);
  margin-bottom: 20px;
  font-size: 0.9rem;
  font-weight: 500;
}

.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--primary-light);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* MODALS & FORMS */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(8px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: fadeInModal 0.25s ease-out;
}

@keyframes fadeInModal {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal-card {
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 500px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  overflow: hidden;
  animation: slideUp 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal-card.large {
  max-width: 750px;
}

@keyframes slideUp {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--bg-app);
}

.modal-header h3 {
  font-size: 1.25rem;
}

.modal-close {
  background: transparent;
  border: none;
  font-size: 1.8rem;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
}

.modal-close:hover {
  color: var(--danger);
}

form {
  padding: 24px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--dark-indigo);
  margin-bottom: 8px;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="url"],
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  font-size: 0.95rem;
  color: var(--text-main);
  transition: var(--transition);
}

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

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--border-color);
}

/* PROPERTIES TABLE (SCREENSHOT MOCKUP STYLE) */
.properties-table {
  background-color: var(--bg-card);
  border-top: 1px solid var(--border-color);
  margin-top: 10px;
  margin-bottom: 25px;
  display: flex;
  flex-direction: column;
}

.property-row {
  display: grid;
  grid-template-columns: 38% 62%;
  padding: 14px 0;
  border-bottom: 1px solid var(--border-color);
  align-items: center;
  font-size: 0.95rem;
  gap: 15px;
}

.property-key {
  color: var(--text-muted);
  font-weight: 400;
  line-height: 1.4;
}

.property-value {
  color: var(--text-main);
  font-weight: 500;
  line-height: 1.4;
  word-break: break-word;
}

.property-value a.property-file-link {
  color: var(--primary);
  font-weight: 500;
  text-decoration: none;
  border-bottom: 1.5px solid transparent;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.property-value a.property-file-link:hover {
  border-bottom-color: var(--primary);
}

/* DYNAMIC PROPERTIES EDITOR IN MODAL */
.modal-properties-list {
  background-color: var(--bg-app);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 10px;
}

.modal-property-row-item {
  display: flex;
  align-items: center;
  gap: 8px;
  background-color: #fff;
  padding: 8px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  margin-bottom: 8px;
}

.modal-property-row-item:last-child {
  margin-bottom: 0;
}

.modal-property-row-item input[type="text"],
.modal-property-row-item select {
  padding: 8px 10px !important;
  font-size: 0.85rem !important;
  margin: 0 !important;
  height: 36px;
}

.modal-property-row-item input.prop-key {
  flex: 4;
}

.modal-property-row-item select.prop-type {
  flex: 2;
  min-width: 80px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
}

.modal-property-row-item input.prop-val,
.modal-property-row-item select.prop-val-select {
  flex: 5;
}

.modal-property-row-item .remove-prop-row-btn {
  background-color: var(--danger-light);
  color: var(--danger);
  border: none;
  border-radius: 4px;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.modal-property-row-item .remove-prop-row-btn:hover {
  background-color: var(--danger);
  color: #fff;
}

/* SIDEBAR LAYOUT ALIGNMENT WITH CHEVRONS */
.categories-nav .category-header-row {
  border-bottom: 1px solid var(--border-color);
}
.categories-nav .category-header-row:last-child {
  border-bottom: none;
}
.categories-nav .category-header-row.active-cat {
  border-left: 3.5px solid var(--primary) !important;
  background-color: var(--primary-light) !important;
  color: var(--primary) !important;
}
.categories-nav .category-header-row.active-cat .category-title-text {
  color: var(--primary);
  font-weight: 600;
}
.categories-nav .category-header-row.active-cat .sidebar-chevron {
  color: var(--primary);
}
.sidebar-chevron {
  color: var(--text-muted);
  opacity: 0.7;
  transition: var(--transition);
}
.category-header-row:hover .sidebar-chevron {
  opacity: 1;
  transform: translateX(2px);
}

/* RESPONSIVE DESIGN */
@media (max-width: 900px) {
  .layout-container {
    grid-template-columns: 1fr;
  }
  
  .mode-toggle-container {
    top: auto;
    bottom: 20px;
    right: 20px;
  }
}

@media (max-width: 600px) {
  .header-container {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .contact-info {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
  
  .content-panel {
    padding: 20px;
  }
  
  .footer-container {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .footer-right {
    align-items: flex-start;
  }
}