/* ===== Reset ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--color-bg-primary);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--color-text-link);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

input {
  font-family: inherit;
  font-size: inherit;
}

code, pre {
  font-family: var(--font-mono);
}

/* ===== App Shell ===== */
#app-root {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===== Header Bar ===== */
.app-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  height: var(--header-height);
  background: var(--color-header-bg);
  border-bottom: 1px solid var(--color-border-default);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-6);
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-primary);
}

.header-left .logo-icon {
  font-size: 20px;
  color: var(--color-accent);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* ===== Main Content ===== */
.main-content {
  flex: 1;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-8) var(--space-6);
}

/* ===== Login Page Layout ===== */
.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: var(--space-6);
  background: var(--color-bg-primary);
}

.login-container {
  width: 100%;
  max-width: 400px;
}

/* ===== Directory Page ===== */
.directory-page {
  animation: fadeIn var(--transition-slow);
}

.hero-section {
  text-align: center;
  padding: var(--space-12) 0 var(--space-10);
}

.hero-icon {
  font-size: 48px;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
}

.hero-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
  letter-spacing: -0.5px;
}

.hero-subtitle {
  font-size: 15px;
  color: var(--color-text-secondary);
  max-width: 480px;
  margin: 0 auto;
}

/* ===== Zone Cards Grid ===== */
.zone-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-10);
}

.zone-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  cursor: pointer;
  transition: transform var(--transition-fast),
    box-shadow var(--transition-fast),
    border-color var(--transition-fast),
    background var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.zone-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--card-accent, var(--color-accent));
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.zone-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--card-accent, var(--color-accent));
  background: var(--color-card-hover);
}

.zone-card:hover::before {
  opacity: 1;
}

.zone-card-icon {
  font-size: 28px;
  margin-bottom: var(--space-3);
  color: var(--card-accent, var(--color-accent));
}

.zone-card-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-1);
}

.zone-card-count {
  font-size: 13px;
  color: var(--color-text-secondary);
}

.zone-card-desc {
  font-size: 13px;
  color: var(--color-text-tertiary);
  margin-top: var(--space-2);
}

/* ===== Info Panel ===== */
.info-panel {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-muted);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-bottom: var(--space-8);
}

.info-panel h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.info-panel p,
.info-panel li {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.info-panel ul {
  padding-left: var(--space-5);
}

/* ===== Footer ===== */
.app-footer {
  text-align: center;
  padding: var(--space-6);
  border-top: 1px solid var(--color-border-muted);
  font-size: 12px;
  color: var(--color-text-tertiary);
}

/* ===== Zone View ===== */
.zone-page {
  animation: fadeIn var(--transition-slow);
}

.zone-header {
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-border-muted);
}

.zone-back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
  transition: color var(--transition-fast);
}
.zone-back:hover {
  color: var(--color-text-primary);
  text-decoration: none;
}

.zone-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: -0.5px;
}

.zone-title .zone-icon {
  color: var(--zone-accent, var(--color-accent));
  margin-right: var(--space-2);
}

.zone-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-top: var(--space-2);
}

.zone-equipment-note {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-3);
  padding: var(--space-2) var(--space-3);
  background: var(--zone-accent-subtle, var(--color-accent-subtle));
  border: 1px solid var(--zone-accent-muted, var(--color-accent-muted));
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--zone-accent-emphasis, var(--color-accent-emphasis));
}

/* ===== Search Bar ===== */
.search-bar-wrap {
  position: sticky;
  top: var(--header-height);
  z-index: var(--z-sticky);
  background: var(--color-bg-primary);
  padding: var(--space-3) 0;
  margin-bottom: var(--space-6);
}

.search-bar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-4);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-bar:focus-within {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-muted);
}

.search-bar input {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--color-text-primary);
  font-size: 14px;
  outline: none;
  padding: var(--space-2) 0;
}

.search-bar input::placeholder {
  color: var(--color-text-tertiary);
}

.search-icon {
  color: var(--color-text-tertiary);
  font-size: 16px;
  flex-shrink: 0;
}

.search-stats {
  font-size: 12px;
  color: var(--color-text-tertiary);
  white-space: nowrap;
  flex-shrink: 0;
}

.search-clear {
  display: none;
  color: var(--color-text-tertiary);
  padding: var(--space-1);
  border-radius: var(--radius-sm);
  font-size: 14px;
  transition: color var(--transition-fast), background var(--transition-fast);
}
.search-clear.visible {
  display: flex;
  align-items: center;
  justify-content: center;
}
.search-clear:hover {
  color: var(--color-text-primary);
  background: var(--color-bg-tertiary);
}

/* Search Results Dropdown */
.search-results-dropdown {
  display: none;
  max-height: 320px;
  overflow-y: auto;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-md);
  margin-top: var(--space-1);
  box-shadow: var(--shadow-lg);
}

.search-results-dropdown.active {
  display: block;
}

.search-result-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-4);
  cursor: pointer;
  font-size: 13px;
  color: var(--color-text-primary);
  transition: background var(--transition-fast);
  border-bottom: 1px solid var(--color-border-muted);
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-item:hover {
  background: var(--color-accent-subtle);
}

.search-result-id {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-tertiary);
  min-width: 28px;
}

.search-result-name {
  flex: 1;
}

/* ===== Level Cards Grid ===== */
.level-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: var(--space-5);
}

/* ===== Level Card ===== */
.level-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition-fast),
    box-shadow var(--transition-fast);
  scroll-margin-top: calc(var(--header-height) + var(--search-bar-height) + 20px);
}

.level-card:hover {
  border-color: var(--color-border-emphasis);
  box-shadow: var(--shadow-sm);
}

.level-card.highlight {
  animation: cardHighlight 2s ease-out;
  border-color: var(--zone-accent, var(--color-accent));
  box-shadow: 0 0 0 3px var(--zone-accent-muted, var(--color-accent-muted));
}

@keyframes cardHighlight {
  0% {
    box-shadow: 0 0 0 8px var(--zone-accent-muted, var(--color-accent-muted));
    transform: scale(1.01);
  }
  100% {
    box-shadow: 0 0 0 3px var(--zone-accent-muted, var(--color-accent-muted));
    transform: scale(1);
  }
}

.level-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-5);
  background: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border-muted);
}

.level-card-id {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--zone-accent, var(--color-accent));
  min-width: 36px;
}

.level-card-name {
  flex: 1;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-left: var(--space-3);
}

.level-card-tag {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--zone-accent-subtle, var(--color-accent-subtle));
  color: var(--zone-accent-emphasis, var(--color-accent-emphasis));
  font-weight: 500;
}

/* ===== Code Block ===== */
.level-code-wrap {
  position: relative;
}

.level-code-wrap pre {
  margin: 0;
  padding: var(--space-5);
  background: var(--color-bg-code);
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.65;
  color: var(--color-text-primary);
  border-bottom: 1px solid var(--color-border-muted);
  max-height: 400px;
  overflow-y: auto;
}

.level-code-wrap pre::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

.level-code-wrap pre::-webkit-scrollbar-track {
  background: transparent;
}

.level-code-wrap pre::-webkit-scrollbar-thumb {
  background: var(--color-border-default);
  border-radius: var(--radius-full);
}

.copy-btn {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-md);
  font-size: 12px;
  color: var(--color-text-secondary);
  opacity: 0;
  transition: opacity var(--transition-fast),
    color var(--transition-fast),
    background var(--transition-fast),
    border-color var(--transition-fast);
}

.level-card:hover .copy-btn {
  opacity: 1;
}

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

.copy-btn.copied {
  color: var(--color-success);
  border-color: var(--color-success);
  opacity: 1;
}

/* ===== Card Footer (equipment/bilibili) ===== */
.level-card-footer {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-5);
  flex-wrap: wrap;
}

.equipment-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 12px;
  color: var(--color-text-secondary);
}

.equipment-tag img {
  height: 28px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-default);
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.equipment-tag img:hover {
  transform: scale(2.2);
  z-index: var(--z-dropdown);
  position: relative;
}

.bilibili-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 12px;
  color: var(--color-text-link);
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-full);
  transition: background var(--transition-fast),
    border-color var(--transition-fast);
}

.bilibili-link:hover {
  background: var(--color-accent-subtle);
  border-color: var(--color-accent);
  text-decoration: none;
}

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: var(--z-sticky);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border-default);
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity var(--transition-fast),
    transform var(--transition-fast),
    background var(--transition-fast),
    color var(--transition-fast);
}

.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.back-to-top:hover {
  background: var(--color-accent-muted);
  color: var(--color-accent);
}

/* ===== Admin Section ===== */
.admin-section {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border-muted);
}

/* ===== Animations ===== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

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

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

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .level-grid {
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 48px;
  }

  .app-header {
    padding: 0 var(--space-4);
  }

  .main-content {
    padding: var(--space-4) var(--space-4);
  }

  .hero-section {
    padding: var(--space-8) 0 var(--space-6);
  }

  .hero-title {
    font-size: 22px;
  }

  .zone-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: var(--space-3);
  }

  .zone-card {
    padding: var(--space-4);
  }

  .level-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .search-bar-wrap {
    position: sticky;
    top: var(--header-height);
  }

  .level-card-header {
    padding: var(--space-2) var(--space-4);
  }

  .level-code-wrap pre {
    padding: var(--space-4);
    font-size: 12px;
  }

  .copy-btn {
    opacity: 1;
    padding: var(--space-1) var(--space-2);
    top: var(--space-1);
    right: var(--space-1);
  }

  .search-results-dropdown {
    max-height: 240px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 20px;
  }

  .hero-icon {
    font-size: 36px;
  }

  .zone-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2);
  }

  .zone-card {
    padding: var(--space-3);
  }

  .zone-card-name {
    font-size: 14px;
  }

  .search-bar {
    padding: var(--space-1) var(--space-3);
  }

  .search-stats {
    display: none;
  }

  .back-to-top {
    bottom: var(--space-4);
    right: var(--space-4);
  }
}