@import url('https://fonts.googleapis.cn/css2?family=Noto+Serif+SC:wght@400;600;700&display=swap');

/* ==================== CSS Variables ==================== */
:root {
  --bg-deep: #0a0e1a;
  --bg-card: #131825;
  --bg-card-hover: #1a2035;
  --bg-input: #0f1420;
  --color-primary: #e8a849;
  --color-primary-dim: #c48a30;
  --color-primary-bg: rgba(232, 168, 73, 0.08);
  --color-accent: #c44b3f;
  --color-accent-bg: rgba(196, 75, 63, 0.08);
  --color-text: #e8e0d4;
  --color-text-secondary: #8892a4;
  --color-border: #2a2520;
  --color-border-hover: #3d352a;
  --color-online: #4ade80;
  --color-offline: #6b7280;
  --color-maintenance: #f59e0b;
  --color-danger: #ef4444;
  --color-danger-bg: rgba(239, 68, 68, 0.1);
  --font-serif: 'Noto Serif SC', 'Songti SC', serif;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  --radius: 6px;
  --transition: 250ms ease-out;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-deep);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(ellipse 600px 400px at 20% 10%, rgba(232, 168, 73, 0.03) 0%, transparent 70%),
    radial-gradient(ellipse 500px 300px at 80% 80%, rgba(196, 75, 63, 0.02) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* ==================== Layout ==================== */
.admin-container {
  position: relative;
  z-index: 1;
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ==================== Login Screen ==================== */
.login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 24px;
}

.login-box {
  background: var(--bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 40px 36px;
  width: 100%;
  max-width: 380px;
}

.login-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  text-align: center;
  margin-bottom: 8px;
}

.login-subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  margin-bottom: 28px;
}

/* ==================== Form Elements ==================== */
.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  margin-bottom: 6px;
  font-weight: 500;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-input);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  font-size: 0.88rem;
  font-family: var(--font-sans);
  transition: border-color var(--transition);
  outline: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(232, 168, 73, 0.1);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-text-secondary);
  opacity: 0.5;
}

.form-textarea {
  resize: vertical;
  min-height: 80px;
  line-height: 1.5;
}

.form-select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%238892a4' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
}

.form-select option {
  background: var(--bg-card);
  color: var(--color-text);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.form-hint {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  margin-top: 4px;
  opacity: 0.7;
}

/* ==================== Buttons ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 18px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-sans);
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--color-primary);
  color: #0a0e1a;
  border-color: var(--color-primary);
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-dim);
  box-shadow: 0 0 16px rgba(232, 168, 73, 0.2);
}

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

.btn-secondary:hover:not(:disabled) {
  color: var(--color-text);
  border-color: var(--color-border-hover);
  background: rgba(255, 255, 255, 0.03);
}

.btn-danger {
  background: transparent;
  color: var(--color-danger);
  border-color: rgba(239, 68, 68, 0.3);
}

.btn-danger:hover:not(:disabled) {
  background: var(--color-danger-bg);
  border-color: var(--color-danger);
}

.btn-sm {
  padding: 5px 12px;
  font-size: 0.78rem;
}

.btn-full {
  width: 100%;
}

/* ==================== Admin Header ==================== */
.admin-header {
  padding: 28px 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 24px;
}

.admin-header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.admin-title {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-primary);
}

.admin-badge {
  font-size: 0.7rem;
  padding: 2px 8px;
  background: var(--color-primary-bg);
  color: var(--color-primary-dim);
  border: 1px solid rgba(232, 168, 73, 0.2);
  border-radius: 3px;
}

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

.admin-link {
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition);
}

.admin-link:hover {
  color: var(--color-primary);
}

/* ==================== Tabs ==================== */
.tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 24px;
}

.tab {
  padding: 10px 20px;
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all var(--transition);
  background: none;
  border-top: none;
  border-left: none;
  border-right: none;
  font-family: var(--font-sans);
}

.tab:hover {
  color: var(--color-text);
}

.tab.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

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

.server-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.server-table th {
  text-align: left;
  padding: 10px 14px;
  color: var(--color-text-secondary);
  font-weight: 500;
  font-size: 0.78rem;
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

.server-table td {
  padding: 12px 14px;
  border-bottom: 1px solid rgba(42, 37, 32, 0.4);
  vertical-align: middle;
}

.server-table tr:hover td {
  background: rgba(255, 255, 255, 0.015);
}

.server-table .server-name {
  font-weight: 500;
  color: var(--color-text);
}

.server-table .server-ip {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

/* Status dot in table */
.status-dot {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
}

.status-dot::before {
  content: '';
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
}

.status-dot.online { color: var(--color-online); }
.status-dot.online::before { background: var(--color-online); box-shadow: 0 0 6px var(--color-online); }
.status-dot.offline { color: var(--color-offline); }
.status-dot.offline::before { background: var(--color-offline); }
.status-dot.maintenance { color: var(--color-maintenance); }
.status-dot.maintenance::before { background: var(--color-maintenance); }

/* Action buttons in table */
.table-actions {
  display: flex;
  gap: 8px;
}

/* ==================== Section Header ==================== */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-title::before {
  content: '';
  display: inline-block;
  width: 3px;
  height: 16px;
  background: var(--color-primary);
  border-radius: 2px;
}

/* ==================== Modal ==================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  transition: all 200ms ease-out;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  width: 100%;
  max-width: 560px;
  max-height: 85vh;
  overflow-y: auto;
  transform: translateY(10px);
  transition: transform 200ms ease-out;
}

.modal-overlay.active .modal {
  transform: translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--color-border);
}

.modal-title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text);
}

.modal-close {
  background: none;
  border: none;
  color: var(--color-text-secondary);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 4px;
  line-height: 1;
  transition: color var(--transition);
}

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

.modal-body {
  padding: 20px 24px;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  padding: 16px 24px 20px;
  border-top: 1px solid var(--color-border);
}

/* ==================== Toast ==================== */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 12px 18px;
  border-radius: var(--radius);
  font-size: 0.85rem;
  min-width: 240px;
  max-width: 380px;
  animation: toast-in 300ms ease-out;
  border: 1px solid;
}

.toast-success {
  background: rgba(74, 222, 128, 0.1);
  border-color: rgba(74, 222, 128, 0.3);
  color: var(--color-online);
}

.toast-error {
  background: var(--color-danger-bg);
  border-color: rgba(239, 68, 68, 0.3);
  color: var(--color-danger);
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ==================== Empty State ==================== */
.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--color-text-secondary);
}

.empty-state-icon {
  font-size: 2rem;
  margin-bottom: 12px;
  opacity: 0.4;
}

.empty-state-text {
  font-size: 0.9rem;
  margin-bottom: 16px;
}

/* ==================== Loading ==================== */
.loading-spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ==================== Confirm Dialog ==================== */
.confirm-text {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.confirm-highlight {
  color: var(--color-text);
  font-weight: 500;
}

/* ==================== Responsive ==================== */
@media (max-width: 768px) {
  .admin-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .server-table {
    font-size: 0.8rem;
  }

  .server-table th,
  .server-table td {
    padding: 8px 10px;
  }

  .modal {
    max-width: 100%;
    margin: 0 12px;
  }

  .tabs {
    overflow-x: auto;
  }
}