/* ========== 01-base.css ========== */
/* 重置、全局樣式、App容器、導航欄、螢幕系統 */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

body {
  background: #f2f2f7;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  user-select: none;
  overflow: hidden;
  height: 100vh;
  height: 100dvh;
  width: 100%;
  position: fixed;
  left: 0;
  top: 0;
}

.app {
  width: 100%;
  max-width: 480px;
  height: 100%;
  margin: 0 auto;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  background: #f2f2f7;
}

.screen-container {
  flex: 1;
  position: relative;
  overflow: hidden;
}

.screen {
  position: absolute;
  inset: 0;
  display: none;
  flex-direction: column;
  background: #f2f2f7;
  overflow: hidden;
}

.screen.active {
  display: flex;
}

/* ===== 導航欄 ===== */
.nav-bar {
  height: 52px;
  display: flex;
  align-items: center;
  padding: 0 16px;
  flex-shrink: 0;
  position: relative;
  background: #f2f2f7;
}

.nav-bar .nav-title {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  font-size: 17px;
  font-weight: 600;
  color: #1d1d1f;
  white-space: nowrap;
}

.nav-bar .nav-btn {
  background: none;
  border: none;
  font-size: 16px;
  color: #1d1d1f;
  cursor: pointer;
  padding: 6px 8px;
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-bar .nav-btn svg {
  width: 20px;
  height: 20px;
}

.nav-bar .nav-right {
  margin-left: auto;
}

.nav-bar .nav-group-right {
  margin-left: auto;
  display: flex;
  gap: 2px;
}

/* ===== 大標題 & 螢幕主體 ===== */
.large-title {
  padding: 2px 20px 14px;
  font-size: 30px;
  font-weight: 700;
  color: #1d1d1f;
  flex-shrink: 0;
}

.screen-body {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

/* ===== 通用動畫 ===== */
@keyframes spin {
  to { transform: rotate(360deg); }
}

.spin-ring {
  width: 20px;
  height: 20px;
  border: 2px solid #e5e5ea;
  border-top-color: #1d1d1f;
  border-radius: 50%;
  animation: spin .8s linear infinite;
  display: inline-block;
  vertical-align: middle;
}

.spin-ring.sm {
  width: 16px;
  height: 16px;
}

/* ===== 隱藏滾動條 ===== */
::-webkit-scrollbar {
  width: 0;
}
/* ===== Modal Mask (账号创建弹窗等) ===== */
.modal-mask {
  position: fixed;
  inset: 0;
  z-index: 999;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, .35);
}
.modal-mask.show {
  display: flex;
}