/* ========== CSS Reset & Variables ========== */
:root {
  --primary: #4F46E5;
  --primary-hover: #4338CA;
  --primary-light: #EEF2FF;
  --danger: #EF4444;
  --danger-hover: #DC2626;
  --success: #10B981;
  --warning: #F59E0B;
  --bg: #F8FAFC;
  --surface: #FFFFFF;
  --border: #E2E8F0;
  --text: #1E293B;
  --text-secondary: #64748B;
  --text-muted: #94A3B8;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.08), 0 4px 10px rgba(0,0,0,0.05);
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
input, textarea, select, button { font-family: inherit; font-size: inherit; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ========== Header ========== */
.header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo-icon { font-size: 28px; }
.logo h1 {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
}
.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Search */
.search-box {
  display: flex;
  align-items: center;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 50px;
  padding: 6px 16px;
  transition: var(--transition);
  width: 320px;
}
.search-box:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}
.search-box input {
  flex: 1;
  border: none;
  background: none;
  outline: none;
  font-size: 14px;
  color: var(--text);
  padding: 6px 0;
}
.search-box input::placeholder { color: var(--text-muted); }
.search-box button {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  padding: 4px;
  display: flex;
  align-items: center;
}
.search-box button:hover { color: var(--primary); }

.admin-link {
  font-size: 22px;
  text-decoration: none !important;
  opacity: 0.6;
  transition: var(--transition);
}
.admin-link:hover { opacity: 1; }

/* ========== Hero ========== */
.hero {
  text-align: center;
  padding: 40px 0 24px;
}
.hero-desc {
  font-size: 16px;
  color: var(--text-secondary);
  letter-spacing: 0.5px;
}

/* ========== Category Bar ========== */
.category-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}
.category-btn {
  padding: 6px 16px;
  border: 1px solid var(--border);
  border-radius: 50px;
  background: var(--surface);
  color: var(--text-secondary);
  font-size: 13px;
  cursor: pointer;
  transition: var(--transition);
}
.category-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}
.category-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* ========== Tool Count ========== */
.tool-count {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

/* ========== Tool Grid ========== */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  padding-bottom: 60px;
}

.tool-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: relative;
  overflow: hidden;
}
.tool-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}
.tool-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
}
.tool-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}
.tool-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.tool-desc {
  font-size: 13px;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.4;
}
.tool-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: auto;
}
.tool-tag {
  font-size: 11px;
  padding: 2px 8px;
  background: var(--bg);
  border-radius: 4px;
  color: var(--text-muted);
}
.tool-url {
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ========== Empty State ========== */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 80px 20px;
  color: var(--text-muted);
}
.empty-icon { font-size: 56px; margin-bottom: 16px; }
.empty-state p { font-size: 16px; margin-bottom: 20px; }

/* ========== Buttons ========== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}
.btn-primary:hover { background: var(--primary-hover); text-decoration: none; }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 13px;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}
.btn-secondary:hover { border-color: var(--primary); color: var(--primary); text-decoration: none; }

.btn-danger-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--surface);
  color: var(--danger);
  border: 1px solid var(--danger);
  border-radius: var(--radius-sm);
  font-size: 13px;
  cursor: pointer;
  transition: var(--transition);
}
.btn-danger-outline:hover { background: var(--danger); color: #fff; }

.btn-block { width: 100%; }
.btn-sm {
  padding: 4px 10px;
  font-size: 12px;
  border-radius: 6px;
}

/* ========== Footer ========== */
.footer {
  text-align: center;
  padding: 24px;
  color: var(--text-muted);
  font-size: 13px;
  border-top: 1px solid var(--border);
}

/* ============ ADMIN STYLES ============ */

.admin-body { background: #F1F5F9; }

/* Login */
.login-overlay {
  position: fixed;
  inset: 0;
  background: linear-gradient(135deg, #1e1b4b 0%, #312e81 50%, #4338ca 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.login-bg-shapes {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}
.login-bg-shapes::before,
.login-bg-shapes::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  opacity: 0.08;
  background: #fff;
}
.login-bg-shapes::before {
  width: 500px; height: 500px;
  top: -150px; right: -100px;
}
.login-bg-shapes::after {
  width: 300px; height: 300px;
  bottom: -80px; left: -80px;
}
.login-card {
  position: relative;
  background: var(--surface);
  border-radius: 20px;
  padding: 48px 40px;
  width: 400px;
  box-shadow: 0 25px 60px rgba(0,0,0,0.25);
  animation: loginIn 0.5s ease;
}
@keyframes loginIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.login-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}
.login-header .logo-icon { font-size: 40px; }
.login-header h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--text);
}
.login-sub {
  text-align: center;
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 28px;
}
.login-input {
  width: 100%;
  padding: 14px 18px;
  border: 2px solid var(--border);
  border-radius: 12px;
  font-size: 15px;
  outline: none;
  transition: var(--transition);
  margin-bottom: 10px;
  background: #F8FAFC;
}
.login-input:focus {
  border-color: var(--primary);
  background: #fff;
  box-shadow: 0 0 0 4px rgba(79,70,229,0.1);
}
.login-error {
  color: var(--danger);
  font-size: 13px;
  min-height: 22px;
  margin-bottom: 4px;
}

/* Admin Layout */
.admin-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
.admin-topbar {
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 0 32px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 50;
}
.admin-topbar-left {
  display: flex;
  align-items: center;
  gap: 12px;
}
.admin-topbar-left h1 { font-size: 17px; font-weight: 600; }
.admin-topbar-right {
  display: flex;
  align-items: center;
  gap: 10px;
}
.admin-topbar-right a.btn-secondary { text-decoration: none; }

.admin-layout {
  display: flex;
  flex: 1;
  max-width: 1440px;
  margin: 0 auto;
  width: 100%;
}

/* Sidebar */
.admin-sidebar {
  width: 200px;
  background: #fff;
  border-right: 1px solid var(--border);
  padding: 20px 0;
  flex-shrink: 0;
}
.sidebar-header {
  padding: 0 20px 16px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
}
.category-list { list-style: none; }
.category-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  margin: 2px 8px;
  font-size: 14px;
  cursor: pointer;
  color: var(--text-secondary);
  border-radius: 8px;
  transition: all 0.15s ease;
}
.category-item:hover { background: var(--bg); color: var(--text); }
.category-item.active {
  background: #EEF2FF;
  color: var(--primary);
  font-weight: 600;
}
.category-item .cat-icon {
  font-size: 16px;
  width: 20px;
  text-align: center;
}
.category-item .cat-count {
  margin-left: auto;
  font-size: 12px;
  background: var(--bg);
  padding: 2px 8px;
  border-radius: 10px;
  color: var(--text-muted);
}
.category-item.active .cat-count {
  background: rgba(79,70,229,0.15);
  color: var(--primary);
}

/* Admin Main */
.admin-main {
  flex: 1;
  padding: 28px 32px;
  min-width: 0;
}

/* Stats Bar */
.stats-bar {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
}
.stat-card {
  flex: 1;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 20px;
  display: flex;
  align-items: center;
  gap: 14px;
}
.stat-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}
.stat-icon.blue { background: #EEF2FF; }
.stat-icon.green { background: #D1FAE5; }
.stat-icon.orange { background: #FFF7ED; }
.stat-info .stat-num { font-size: 24px; font-weight: 700; line-height: 1.2; }
.stat-info .stat-label { font-size: 12px; color: var(--text-muted); }

/* Toolbar */
.admin-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  gap: 12px;
}
.admin-search {
  position: relative;
}
.admin-search input {
  padding: 10px 16px 10px 40px;
  border: 1px solid var(--border);
  border-radius: 10px;
  width: 300px;
  outline: none;
  font-size: 14px;
  background: #fff;
  transition: var(--transition);
}
.admin-search input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79,70,229,0.1);
}
.admin-search::before {
  content: "🔍";
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 14px;
  pointer-events: none;
}
.admin-toolbar-right { display: flex; gap: 10px; }
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  color: var(--text);
  font-size: 13px;
  cursor: pointer;
  transition: var(--transition);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }

/* Card Grid for Tools */
.tool-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 14px;
}
.tool-admin-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.tool-admin-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
}
.tac-header {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}
.tac-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: #EEF2FF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}
.tac-info { flex: 1; min-width: 0; }
.tac-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 2px;
}
.tac-url {
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.tac-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.tac-category {
  font-size: 11px;
  padding: 3px 10px;
  background: #F1F5F9;
  border-radius: 6px;
  color: var(--text-secondary);
}
.tac-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}
.tac-tag {
  font-size: 10px;
  padding: 2px 7px;
  background: #F8FAFC;
  border-radius: 4px;
  color: var(--text-muted);
}
.tac-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}
.tac-status {
  font-size: 11px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 5px;
}
.tac-status::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
}
.tac-status.online { color: #065F46; }
.tac-status.online::before { background: #10B981; }
.tac-status.offline { color: #991B1B; }
.tac-status.offline::before { background: #EF4444; }
.tac-actions {
  display: flex;
  gap: 6px;
}
.tac-actions button {
  padding: 6px 12px;
  border-radius: 7px;
  font-size: 12px;
  cursor: pointer;
  transition: var(--transition);
}
.btn-edit {
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
}
.btn-edit:hover { border-color: var(--primary); color: var(--primary); }
.btn-del {
  border: 1px solid #FECACA;
  background: #fff;
  color: #DC2626;
}
.btn-del:hover { background: #FEF2F2; }

.empty-admin {
  grid-column: 1 / -1;
  text-align: center;
  padding: 80px 20px;
  background: #fff;
  border: 2px dashed var(--border);
  border-radius: 12px;
}
.empty-admin .empty-icon { font-size: 48px; margin-bottom: 12px; }
.empty-admin p {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

/* Modal - refined */
.modal-mask {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15,23,42,0.45);
  z-index: 200;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
}
.modal-mask.show { display: flex; }
.modal-card {
  background: var(--surface);
  border-radius: 18px;
  width: 580px;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: 0 25px 60px rgba(0,0,0,0.2);
  animation: modalIn 0.25s ease;
}
@keyframes modalIn {
  from { opacity: 0; transform: scale(0.95) translateY(10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}
.modal-sm { width: 420px; }
.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 22px 28px;
  border-bottom: 1px solid var(--border);
}
.modal-header h3 { font-size: 18px; font-weight: 600; }
.modal-close {
  background: none;
  border: none;
  font-size: 22px;
  cursor: pointer;
  color: var(--text-muted);
  width: 32px; height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.modal-close:hover { background: var(--bg); color: var(--text); }
.modal-body { padding: 28px; }
.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  padding: 18px 28px;
  border-top: 1px solid var(--border);
}

/* Form - refined */
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}
.form-group .required { color: var(--danger); }
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 14px;
  outline: none;
  transition: var(--transition);
  background: #F8FAFC;
  color: var(--text);
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--primary);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(79,70,229,0.08);
}
.form-hint { font-size: 11px; color: var(--text-muted); margin-top: 4px; }
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

/* Toast */
.toast {
  position: fixed;
  top: 24px;
  right: 24px;
  padding: 14px 22px;
  border-radius: 12px;
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  z-index: 300;
  opacity: 0;
  transform: translateX(20px);
  transition: all 0.3s ease;
  pointer-events: none;
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
}
.toast.show {
  opacity: 1;
  transform: translateX(0);
}
.toast-success { background: #059669; }
.toast-error { background: #DC2626; }

/* Responsive */
@media (max-width: 768px) {
  .header-inner { flex-wrap: wrap; height: auto; padding: 12px 0; gap: 10px; }
  .search-box { width: 100%; }
  .tool-grid { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
  .admin-layout { flex-direction: column; }
  .admin-sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding: 12px;
  }
  .category-list {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
  }
  .category-item {
    padding: 6px 12px;
    font-size: 13px;
    flex-shrink: 0;
  }
  .admin-main { padding: 16px; }
  .admin-topbar { padding: 0 16px; }
  .admin-search input { width: 100%; }
  .tool-card-grid { grid-template-columns: 1fr; }
  .stats-bar { flex-direction: column; }
  .modal-card { width: calc(100vw - 24px); margin: 12px; }
  .form-row { grid-template-columns: 1fr; }
}