:root {
  --bg: #f5f7fa;
  --card-bg: #ffffff;
  --text: #1a1a2e;
  --text-secondary: #6b7280;
  --border: #e5e7eb;
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-glow: rgba(99,102,241,0.3);
  --accent: #06b6d4;
  --accent-glow: rgba(6,182,212,0.25);
  --danger: #ef4444;
  --success: #22c55e;
  --warning: #f59e0b;
  --stat-icon: #94a3b8;
  --stat-icon-main: #6366f1;
  --slider-track: #e5e7eb;
  --slider-fill: #6366f1;
  --modal-bg: #ffffff;
  --shadow: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-lg: 0 4px 20px rgba(0,0,0,0.12);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --card-bg: #1e293b;
    --text: #e2e8f0;
    --text-secondary: #94a3b8;
    --border: #334155;
    --primary: #818cf8;
    --primary-hover: #6366f1;
    --primary-glow: rgba(129,140,248,0.25);
    --accent: #22d3ee;
    --accent-glow: rgba(34,211,238,0.2);
    --stat-icon: #475569;
    --stat-icon-main: #818cf8;
    --slider-track: #334155;
    --slider-fill: #818cf8;
    --modal-bg: #1e293b;
    --shadow: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-lg: 0 4px 20px rgba(0,0,0,0.5);
  }
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overscroll-behavior: none;
}

::-webkit-scrollbar { display: none; }
html { scrollbar-width: none; }

.header {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--primary);
}

.logo-text {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
}

.main {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 24px 40px;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: var(--shadow);
}

.card-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.url-actions {
  display: flex;
  gap: 4px;
}

.select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card-bg);
  color: var(--text);
  font-size: 14px;
  cursor: pointer;
  outline: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
}

.select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.slider {
  width: 100%;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--slider-track);
  border-radius: 3px;
  outline: none;
  margin-bottom: 16px;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--slider-fill);
  cursor: pointer;
  box-shadow: 0 2px 6px var(--primary-glow);
}

.slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--slider-fill);
  cursor: pointer;
  border: none;
}

.toggle-row {
  display: flex;
  gap: 24px;
  margin-bottom: 4px;
}

.toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  user-select: none;
}

.toggle input { display: none; }

.toggle-track {
  width: 36px;
  height: 20px;
  background: var(--slider-track);
  border-radius: 10px;
  position: relative;
  transition: background 0.2s;
}

.toggle-track::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  background: white;
  border-radius: 50%;
  transition: transform 0.2s;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.toggle input:checked + .toggle-track {
  background: var(--primary);
}

.toggle input:checked + .toggle-track::after {
  transform: translateX(16px);
}

.toggle-label {
  font-size: 13px;
  color: var(--text-secondary);
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  padding: 20px;
}

.stat-card {
  position: relative;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}

.stat-card-main {
  border-color: var(--primary);
  background: linear-gradient(135deg, var(--primary-glow), transparent);
}

.stat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4px;
}

.stat-title {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
}

.stat-value {
  font-size: 26px;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
}

.stat-value-main {
  color: var(--primary);
}

.stat-limit {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 2px;
}

.stat-icon {
  position: absolute;
  right: 12px;
  bottom: 8px;
  width: 36px;
  height: 36px;
  color: var(--stat-icon);
  opacity: 0.4;
}

.stat-icon-main {
  color: var(--stat-icon-main);
  opacity: 0.3;
}

.center-btn-row {
  display: flex;
  justify-content: center;
  margin: 24px 0;
}

.play-btn {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, var(--primary), var(--primary-hover));
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 15px var(--primary-glow);
  transition: transform 0.15s, box-shadow 0.15s;
}

.play-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 25px var(--primary-glow);
}

.play-btn:active {
  transform: scale(0.95);
}

.icon-loading {
  animation: spin 1s linear infinite;
}

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

.chart-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
}

.chart-wrap {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-bottom: 16px;
  overflow: hidden;
  padding: 8px;
}

.ip-card {
  padding: 16px 20px;
}

.ip-info {
  font-size: 13px;
  color: var(--text-secondary);
  text-align: center;
}

.ip-loading {
  opacity: 0.6;
}

.ip-item {
  margin: 6px 0;
}

.ip-tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  margin-right: 6px;
}

.ip-tag.clay {
  background: rgba(34,197,94,0.15);
  color: var(--success);
}

.ip-tag.cloudflare {
  background: rgba(99,102,241,0.15);
  color: var(--primary);
}

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

.footer {
  text-align: center;
  padding: 20px;
  font-size: 12px;
}

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

.footer a:hover {
  color: var(--primary);
}

.btn-ghost {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s;
}

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

.btn-sm {
  padding: 4px 10px;
  font-size: 12px;
}

.btn-icon {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.15s;
}

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

.btn-primary {
  background: var(--primary);
  color: white;
  border: none;
  padding: 8px 20px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

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

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

.btn-danger {
  background: none;
  color: var(--danger);
  border: 1px solid var(--danger);
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
}

.btn-danger:hover {
  background: var(--danger);
  color: white;
}

.toast {
  position: fixed;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--text);
  color: var(--bg);
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  opacity: 0;
  transition: all 0.3s;
  z-index: 9999;
  pointer-events: none;
  white-space: nowrap;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal {
  background: var(--modal-bg);
  border-radius: 16px;
  width: 90%;
  max-width: 500px;
  max-height: 80vh;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
}

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

.modal-title {
  font-size: 16px;
  font-weight: 600;
}

.modal-body {
  padding: 20px;
  overflow-y: auto;
  flex: 1;
}

.modal-footer {
  padding: 12px 20px;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card-bg);
  color: var(--text);
  font-size: 14px;
  outline: none;
}

.form-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.form-input-group {
  display: flex;
  gap: 8px;
}

.form-input-group .form-input {
  flex: 1;
}

.form-select {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card-bg);
  color: var(--text);
  font-size: 14px;
  outline: none;
}

.node-list {
  list-style: none;
  margin-bottom: 12px;
}

.node-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 6px;
  font-size: 13px;
}

.node-name {
  font-weight: 600;
  color: var(--text);
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-right: 8px;
}

.node-url {
  color: var(--text-secondary);
  font-size: 11px;
  flex: 2;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-right: 8px;
}

.alert {
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 12px;
  line-height: 1.6;
  margin-top: 12px;
}

.alert-warn {
  background: rgba(245,158,11,0.1);
  border: 1px solid rgba(245,158,11,0.3);
  color: var(--warning);
}

.alert-danger {
  background: rgba(239,68,68,0.1);
  border: 1px solid rgba(239,68,68,0.3);
  color: var(--danger);
}

.empty-msg {
  text-align: center;
  padding: 30px;
  color: var(--text-secondary);
  font-size: 14px;
}

.fullscreen-overlay {
  position: fixed;
  inset: 0;
  background: #000;
  color: #fff;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.fs-content {
  text-align: center;
  animation: fs-drift 60s infinite alternate ease-in-out;
}

.fs-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 20px;
}

.fs-time {
  font-size: 60px;
  font-weight: 200;
  letter-spacing: 4px;
}

.fs-date {
  font-size: 16px;
  opacity: 0.6;
  margin-top: 4px;
}

.fs-right {
  margin-top: 30px;
}

.fs-stat {
  margin: 12px 0;
}

.fs-des {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
  opacity: 0.5;
  display: block;
  margin-bottom: 4px;
}

.fs-val {
  font-size: 20px;
  font-weight: 600;
}

@keyframes fs-drift {
  0% { transform: translate(0, 0); }
  49% { transform: translate(0, 0); }
  51% { transform: translate(2%, 2%); }
  100% { transform: translate(2%, 2%); }
}

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

.card {
  animation: fadeIn 0.4s ease-out;
}

.popup {
  position: fixed;
  z-index: 500;
}

.popup-body {
  background: var(--modal-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  font-size: 13px;
  box-shadow: var(--shadow-lg);
  min-width: 160px;
}

.popup-body div {
  padding: 3px 0;
}

.popup-body span {
  font-weight: 600;
  color: var(--primary);
}

@media screen and (min-width: 500px) {
  .stats-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
  .stat-value {
    font-size: 32px;
  }
  .stat-card {
    padding: 20px;
  }
}

@media screen and (min-width: 768px) {
  .header-inner {
    padding: 14px 32px;
  }
  .logo-text {
    font-size: 20px;
  }
  .main {
    padding: 28px 32px 48px;
  }
  .card {
    padding: 24px;
  }
  .stat-value {
    font-size: 36px;
  }
  .play-btn {
    width: 96px;
    height: 96px;
  }
  .play-btn svg {
    width: 48px;
    height: 48px;
  }
  .chart-wrap {
    border-radius: 14px;
  }
}

@media screen and (min-width: 1024px) {
  .header-inner {
    max-width: 1100px;
  }
  .main {
    max-width: 1100px;
  }
  .stats-grid {
    gap: 20px;
  }
  .stat-value {
    font-size: 40px;
  }
  .stat-title {
    font-size: 13px;
  }
}