:root {
  /* Reference palette */
  --bg: #FFFFFF;
  --bg-card: #FFFFFF;
  --bg-hover: #F5F5F5;
  --text-primary: #000000;
  --text-secondary: #333333;
  --text-muted: #999999;
  --border-color: #E5E5E5;
  --border-hover: #000000;
  --shadow: rgba(0, 0, 0, .05);
  --red: #E53935;
  --blue: #1A73E8;

  /* shadcn variables */
  --background: 0 0% 100%;
  --foreground: 0 0% 0%;
  --card: 0 0% 100%;
  --card-foreground: 0 0% 0%;
  --popover: 0 0% 100%;
  --popover-foreground: 0 0% 0%;
  --primary: 0 0% 0%;
  --primary-foreground: 0 0% 100%;
  --secondary: 0 0% 96%;
  --secondary-foreground: 0 0% 20%;
  --muted: 0 0% 96%;
  --muted-foreground: 0 0% 60%;
  --accent: 0 0% 96%;
  --accent-foreground: 0 0% 20%;
  --destructive: 0 72% 51%;
  --destructive-foreground: 0 0% 100%;
  --border: 0 0% 90%;
  --input: 0 0% 90%;
  --ring: 0 0% 0%;
  --radius: 0rem;
}

[data-theme="dark"] {
  --bg: #0a0a0a;
  --bg-card: #0a0a0a;
  --bg-hover: #1a1a1a;
  --text-primary: #ffffff;
  --text-secondary: #e5e5e5;
  --text-muted: #777777;
  --border-color: #2a2a2a;
  --border-hover: #ffffff;
  --shadow: rgba(0, 0, 0, .3);
  --red: #ef5350;
  --blue: #448aff;

  --background: 0 0% 4%;
  --foreground: 0 0% 100%;
  --card: 0 0% 4%;
  --card-foreground: 0 0% 100%;
  --popover: 0 0% 4%;
  --popover-foreground: 0 0% 100%;
  --primary: 0 0% 100%;
  --primary-foreground: 0 0% 0%;
  --secondary: 0 0% 15%;
  --secondary-foreground: 0 0% 100%;
  --muted: 0 0% 15%;
  --muted-foreground: 0 0% 60%;
  --accent: 0 0% 15%;
  --accent-foreground: 0 0% 100%;
  --destructive: 0 72% 51%;
  --destructive-foreground: 0 0% 100%;
  --border: 0 0% 20%;
  --input: 0 0% 20%;
  --ring: 0 0% 100%;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  font-family: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

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

/* Theme toggle */
.theme-toggle {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
}

.theme-toggle:hover {
  background: var(--bg-hover);
  border-color: var(--border-hover);
  color: var(--text-primary);
}

.theme-toggle .fa-moon,
[data-theme="dark"] .theme-toggle .fa-sun {
  display: none;
}

[data-theme="dark"] .theme-toggle .fa-moon,
.theme-toggle .fa-sun {
  display: inline-block;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
}

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

.btn-primary {
  background: var(--text-primary);
  color: var(--bg);
  border-color: var(--text-primary);
}

.btn-primary:hover {
  background: var(--text-secondary);
  border-color: var(--text-secondary);
  color: var(--bg);
}

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

.btn-secondary:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
}

.btn-ghost {
  background: transparent;
  border-color: transparent;
  color: var(--text-muted);
}

.btn-ghost:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.btn-danger {
  background: var(--red);
  color: #fff;
  border-color: var(--red);
}

.btn-danger:hover {
  filter: brightness(0.95);
}

.btn-sm {
  padding: 6px 10px;
  font-size: 13px;
}

.btn-block {
  width: 100%;
  padding: 11px;
  font-size: 15px;
}

/* Inputs */
.input-group {
  display: flex;
  flex-direction: column;
  margin-bottom: 16px;
  flex: 1;
}

.input-group.small {
  max-width: 90px;
}

.input-group label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.input-group input,
.input-group select {
  padding: 10px 12px;
  background: var(--bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s;
}

.input-group input:focus,
.input-group select:focus {
  border-color: var(--border-hover);
}

.input-group input::placeholder {
  color: var(--text-muted);
}

/* Login */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: var(--bg);
}

.login-card {
  width: 100%;
  max-width: 400px;
  padding: 40px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  box-shadow: 0 4px 20px var(--shadow);
}

.brand {
  text-align: center;
  margin-bottom: 32px;
}

.logo {
  width: 48px;
  height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--text-primary);
  color: var(--bg);
  font-size: 22px;
  margin-bottom: 16px;
}

.brand h1 {
  margin: 0;
  font-size: 32px;
  font-weight: 300;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-family: "Cormorant Garamond", "Noto Sans SC", serif;
}

.brand p {
  margin: 8px 0 0;
  color: var(--text-muted);
  font-size: 14px;
}

/* App layout */
.app-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  background: var(--bg);
  border-bottom: 1px solid var(--border-color);
}

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

.header-left .logo {
  width: 32px;
  height: 32px;
  font-size: 16px;
  margin: 0;
}

.header-left h1 {
  margin: 0;
  font-size: 20px;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-family: "Cormorant Garamond", "Noto Sans SC", serif;
}

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

.app-body {
  flex: 1;
  display: flex;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  padding: 32px;
  gap: 32px;
}

/* Sidebar */
.sidebar {
  width: 240px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 8px 12px;
}

.sidebar-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: background 0.15s, color 0.15s;
}

.sidebar-link:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.sidebar-link.active {
  background: var(--text-primary);
  color: var(--bg);
}

.sidebar-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 22px;
  height: 22px;
  padding: 0 7px;
  border-radius: var(--radius);
  background: var(--bg-hover);
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 600;
}

.sidebar-link.active .sidebar-count {
  background: rgba(255, 255, 255, 0.2);
  color: var(--bg);
}

/* Main content */
.main-content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

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

.page-title {
  margin: 0;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.page-subtitle {
  margin: 4px 0 0;
  color: var(--text-muted);
  font-size: 14px;
}

/* Search */
.search-box {
  position: relative;
  width: 100%;
  max-width: 320px;
}

.search-box i {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 14px;
}

.search-box input {
  width: 100%;
  padding: 10px 12px 10px 36px;
  background: var(--bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s;
}

.search-box input:focus {
  border-color: var(--border-hover);
}

.search-box input::placeholder {
  color: var(--text-muted);
}

/* Section */
.section {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.section-title {
  margin: 0;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

/* Link grid */
.link-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.link-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  transition: border-color 0.2s, background 0.2s, transform 0.2s;
}

.link-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-hover);
  transform: translateY(-1px);
}

.card-icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-hover);
  border-radius: var(--radius);
  font-size: 20px;
  color: var(--text-primary);
}

.card-body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.card-body h3 {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.card-url {
  font-size: 12px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.card-arrow {
  color: var(--text-muted);
  font-size: 12px;
  transition: transform 0.2s, color 0.2s;
}

.link-card:hover .card-arrow {
  transform: translateX(3px);
  color: var(--text-primary);
}

.icon-emoji {
  font-style: normal;
  line-height: 1;
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: 80px 20px;
  color: var(--text-muted);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
}

.empty-state i {
  font-size: 56px;
  margin-bottom: 16px;
  opacity: 0.6;
}

.empty-state p {
  margin: 0 0 18px;
  font-size: 16px;
}

.empty-text {
  text-align: center;
  color: var(--text-muted);
  padding: 24px 0;
}

/* Cards (admin) */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 24px;
}

.card h2 {
  margin: 0 0 20px;
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Admin form */
.form-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 6px;
}

.admin-form .btn {
  margin-top: 6px;
}

.form-actions {
  display: flex;
  gap: 12px;
  margin-top: 6px;
}

.inline-form {
  display: inline;
}

/* Table */
.table-wrap {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.data-table th,
.data-table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.data-table th {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.td-icon {
  font-size: 20px;
  width: 50px;
}

.td-actions {
  display: flex;
  gap: 8px;
  white-space: nowrap;
}

.badge {
  display: inline-block;
  padding: 4px 10px;
  background: var(--bg-hover);
  color: var(--text-secondary);
  border-radius: var(--radius);
  font-size: 12px;
  font-weight: 600;
}

.table-link {
  color: var(--blue);
  word-break: break-all;
}

.table-link:hover {
  text-decoration: underline;
}

/* Flash messages */
.flash-messages {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.alert {
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  border: 1px solid transparent;
}

.alert-success {
  background: var(--bg-hover);
  color: var(--text-secondary);
  border-color: var(--border-color);
}

.alert-danger {
  background: var(--red);
  color: #fff;
  border-color: var(--red);
}

.alert-info {
  background: var(--bg-hover);
  color: var(--text-secondary);
  border-color: var(--border-color);
}

.alert-warning {
  background: var(--bg-hover);
  color: var(--text-secondary);
  border-color: var(--border-color);
}

/* Responsive */
@media (max-width: 768px) {
  .app-body {
    flex-direction: column;
    padding: 20px;
    gap: 20px;
  }

  .sidebar {
    width: 100%;
    flex-direction: row;
    flex-wrap: wrap;
  }

  .sidebar-title {
    width: 100%;
  }

  .app-header {
    padding: 12px 16px;
  }

  .header-actions .btn span {
    display: none;
  }

  .page-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .search-box {
    max-width: 100%;
  }

  .link-grid {
    grid-template-columns: 1fr;
  }

  .form-row {
    flex-direction: column;
  }

  .input-group.small {
    max-width: 100%;
  }
}