:root {
  --primary: #1038e0;
  --primary-dark: #0b2aad;
  --primary-light: #e8eeff;
  --bg: #f5f7fb;
  --card-bg: #ffffff;
  --text: #1a1a2e;
  --text-secondary: #5a5a7a;
  --border: #e2e6f0;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --radius: 12px;
  --shadow: 0 2px 12px rgba(16, 56, 224, 0.06);
  --shadow-hover: 0 4px 20px rgba(16, 56, 224, 0.12);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* === HEADER === */
.header {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  color: var(--text);
}

.header-brand img {
  height: 44px;
  width: auto;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-nav a, .header-nav button {
  padding: 8px 16px;
  border-radius: 8px;
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  background: none;
  color: var(--text-secondary);
}

.header-nav a:hover, .header-nav button:hover {
  background: var(--primary-light);
  color: var(--primary);
}

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

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

/* === HERO === */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  text-align: center;
  padding: 3rem 2rem;
}

.hero h1 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.hero p {
  font-size: 1rem;
  opacity: 0.9;
  max-width: 500px;
  margin: 0 auto;
}

/* === MAIN === */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* === FILTERS === */
.filters {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.search-box {
  flex: 1;
  min-width: 200px;
  position: relative;
}

.search-box input {
  width: 100%;
  padding: 10px 14px 10px 40px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.9rem;
  background: var(--card-bg);
  transition: border-color 0.2s;
}

.search-box input:focus {
  outline: none;
  border-color: var(--primary);
}

.search-box svg {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-secondary);
  width: 18px;
  height: 18px;
}

.filter-btn {
  padding: 10px 18px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card-bg);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.2s;
  white-space: nowrap;
}

.filter-btn:hover, .filter-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* === TOOLS GRID === */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
}

.tool-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: box-shadow 0.2s, transform 0.15s;
  box-shadow: var(--shadow);
}

.tool-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.tool-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.tool-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
}

.tool-badge {
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.72rem;
  font-weight: 600;
  background: var(--primary-light);
  color: var(--primary);
  white-space: nowrap;
}

.tool-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  flex-grow: 1;
}

.tool-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.tool-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.btn-download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 8px;
  border: none;
  background: var(--primary);
  color: #fff;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.1s;
  text-decoration: none;
}

.btn-download:hover {
  opacity: 0.9;
  transform: scale(1.02);
}

.btn-download svg {
  width: 16px;
  height: 16px;
}

/* === EMPTY STATE === */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-secondary);
}

.empty-state svg {
  width: 64px;
  height: 64px;
  margin-bottom: 1rem;
  opacity: 0.4;
}

.empty-state h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  color: var(--text);
}

/* === LOGIN === */
.login-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  backdrop-filter: blur(4px);
}

.login-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 2.5rem;
  width: 100%;
  max-width: 380px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

.login-card h2 {
  text-align: center;
  margin-bottom: 0.5rem;
  color: var(--primary);
}

.login-card .login-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: 1.5rem;
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.9rem;
  background: var(--card-bg);
  transition: border-color 0.2s;
  font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
}

.form-group textarea {
  resize: vertical;
  min-height: 70px;
}

.form-group input[type="color"] {
  padding: 4px;
  height: 42px;
  cursor: pointer;
}

.btn-primary {
  width: 100%;
  padding: 12px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

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

.btn-secondary {
  padding: 8px 16px;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
}

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

.btn-danger {
  padding: 8px 16px;
  background: var(--danger);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: opacity 0.2s;
}

.btn-danger:hover { opacity: 0.85; }

.error-msg {
  color: var(--danger);
  font-size: 0.83rem;
  text-align: center;
  margin-top: 0.75rem;
}

/* === ADMIN PANEL === */
.admin-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  min-height: calc(100vh - 72px);
}

.admin-sidebar {
  background: var(--card-bg);
  border-right: 1px solid var(--border);
  padding: 1.5rem 0;
}

.admin-sidebar a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 1.5rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.2s;
}

.admin-sidebar a:hover, .admin-sidebar a.active {
  background: var(--primary-light);
  color: var(--primary);
}

.admin-sidebar a svg {
  width: 18px;
  height: 18px;
}

.admin-content {
  padding: 2rem;
  overflow-y: auto;
}

.admin-content h2 {
  font-size: 1.3rem;
  margin-bottom: 1.5rem;
  color: var(--text);
}

/* === ADMIN TABLE === */
.data-table-wrapper {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card-bg);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.data-table th {
  background: var(--bg);
  padding: 12px 16px;
  text-align: left;
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
}

.data-table td {
  padding: 12px 16px;
  font-size: 0.875rem;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: var(--primary-light); }

.action-btns {
  display: flex;
  gap: 6px;
}

.action-btn {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.action-btn:hover { background: var(--bg); }
.action-btn.delete:hover { background: #fef2f2; border-color: var(--danger); color: var(--danger); }
.action-btn svg { width: 14px; height: 14px; }

/* === UPLOAD ZONE === */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  background: var(--card-bg);
  margin-bottom: 1rem;
}

.upload-zone:hover, .upload-zone.dragover {
  border-color: var(--primary);
  background: var(--primary-light);
}

.upload-zone svg { width: 40px; height: 40px; color: var(--text-secondary); margin-bottom: 0.5rem; }
.upload-zone p { color: var(--text-secondary); font-size: 0.9rem; }
.upload-zone .file-name { color: var(--primary); font-weight: 600; margin-top: 0.5rem; }

/* === MODAL === */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  backdrop-filter: blur(4px);
}

.modal {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 2rem;
  width: 100%;
  max-width: 480px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
  max-height: 90vh;
  overflow-y: auto;
}

.modal h3 {
  font-size: 1.15rem;
  margin-bottom: 1.25rem;
}

.modal-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  margin-top: 1.5rem;
}

/* === LOGS === */
.log-filters {
  display: flex;
  gap: 10px;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.log-badge {
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.72rem;
  font-weight: 600;
}

.log-badge.download { background: #dbeafe; color: #1d4ed8; }
.log-badge.login { background: #d1fae5; color: #059669; }
.log-badge.login_failed { background: #fee2e2; color: #dc2626; }
.log-badge.logout { background: #fef3c7; color: #d97706; }
.log-badge.tool_add { background: #e0e7ff; color: #4338ca; }
.log-badge.tool_edit { background: #fce7f3; color: #be185d; }
.log-badge.tool_delete { background: #fee2e2; color: #dc2626; }

.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 1.5rem;
}

.pagination button {
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card-bg);
  cursor: pointer;
  font-size: 0.85rem;
  transition: all 0.2s;
}

.pagination button:hover:not(:disabled) { background: var(--primary-light); }
.pagination button:disabled { opacity: 0.4; cursor: default; }
.pagination span { font-size: 0.85rem; color: var(--text-secondary); }

/* === COLOR PREVIEW === */
.color-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.color-row input[type="color"] {
  width: 50px;
  flex-shrink: 0;
}

.color-preview {
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 4px;
  vertical-align: middle;
  border: 1px solid var(--border);
}

/* === TOAST === */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  padding: 12px 20px;
  border-radius: 8px;
  color: #fff;
  font-size: 0.875rem;
  font-weight: 500;
  z-index: 300;
  animation: slideIn 0.3s ease, fadeOut 0.3s ease 2.7s forwards;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }

@keyframes slideIn { from { transform: translateY(20px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
@keyframes fadeOut { to { opacity: 0; transform: translateY(-10px); } }

/* === FOOTER === */
.footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--text-secondary);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
  background: var(--card-bg);
}

.footer a {
  color: var(--primary);
  text-decoration: none;
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
  .admin-layout { grid-template-columns: 1fr; }
  .admin-sidebar {
    display: flex;
    overflow-x: auto;
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding: 0;
  }
  .admin-sidebar a { white-space: nowrap; padding: 12px 16px; }
  .tools-grid { grid-template-columns: 1fr; }
  .hero { padding: 2rem 1rem; }
  .hero h1 { font-size: 1.4rem; }
  .header { padding: 0 1rem; }
  .filters { flex-direction: column; }
  .data-table th, .data-table td { padding: 8px 10px; }
}