/* ========================================
   基础样式
   ======================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  height: 100%;
  font-family: var(--font-sans);
  background: var(--color-primary);
  color: var(--color-text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* App Container - 模拟手机 */
.app-container {
  max-width: 430px;
  margin: 0 auto;
  min-height: 100vh;
  background: var(--color-primary);
  position: relative;
  overflow: hidden;
}

/* 页面容器 */
.page {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: none;
  flex-direction: column;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.page.active {
  display: flex;
  opacity: 1;
}

/* ========================================
   通用组件
   ======================================== */

/* 按钮样式 */
.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.2s ease;
  width: 100%;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--color-accent);
  color: white;
}

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

.btn-primary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-secondary {
  background: transparent;
  border: 1px solid var(--color-text-secondary);
  color: var(--color-text-secondary);
}

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

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

/* 状态标签 */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 500;
}

.status-badge.alive {
  background: rgba(78, 204, 163, 0.15);
  color: var(--color-alive);
}

.status-badge.fading {
  background: rgba(243, 156, 18, 0.15);
  color: var(--color-fading);
  animation: pulse-fading 2s infinite;
}

.status-badge.gone {
  background: rgba(99, 110, 114, 0.15);
  color: var(--color-gone);
}

@keyframes pulse-fading {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

/* 状态点 */
.status-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.status-dot.alive {
  background: var(--color-alive);
}

.status-dot.fading {
  background: var(--color-fading);
  animation: pulse-dot 2s infinite;
}

.status-dot.gone {
  background: var(--color-gone);
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* 底部导航 */
.bottom-nav {
  display: flex;
  border-top: 1px solid rgba(255,255,255,0.05);
  padding: var(--space-2);
  padding-bottom: calc(var(--space-2) + env(safe-area-inset-bottom, 20px));
  background: var(--color-primary);
}

.nav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: color 0.2s ease;
}

.nav-item.active {
  color: var(--color-text-primary);
}

.nav-icon {
  font-size: 20px;
}

.nav-label {
  font-size: 11px;
}

/* 返回按钮 */
.back-btn {
  position: absolute;
  top: calc(var(--space-4) + env(safe-area-inset-top, 20px));
  left: var(--space-4);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface);
  border-radius: 50%;
  cursor: pointer;
  z-index: 10;
  font-size: 18px;
  color: var(--color-text-secondary);
  transition: background 0.2s ease;
}

.back-btn:hover {
  background: var(--color-surface-elevated);
}