:root {
  --bg: #f0f4f8;
  --surface: #ffffff;
  --surface2: #f8fafc;
  --text: #0f172a;
  --text2: #475569;
  --text3: #94a3b8;
  --border: #e2e8f0;
  --blue: #2563eb;
  --blue-dark: #1d4ed8;
  --blue-light: #eff6ff;
  --green: #059669;
  --green-light: #d1fae5;
  --amber: #d97706;
  --amber-light: #fef3c7;
  --rose: #e11d48;
  --rose-light: #ffe4e6;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 4px 12px rgba(0,0,0,.05);
  --nav-h: 60px;
}

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

html, body { height: 100%; overflow: hidden; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: "PingFang SC", "SF Pro Display", "Segoe UI", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

#app {
  height: 100%;
  display: flex;
  flex-direction: column;
}

#page {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
}

/* ── Bottom Nav ── */
#nav {
  height: var(--nav-h);
  background: var(--surface);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: stretch;
  flex-shrink: 0;
}
#nav.hidden { display: none; }

.nav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  color: var(--text3);
  font-size: 11px;
  gap: 2px;
  transition: color .15s;
}
.nav-item.active { color: var(--blue); }
.nav-item .nav-icon { font-size: 20px; line-height: 1; }

/* ── Toast ── */
.toast {
  position: fixed;
  bottom: calc(var(--nav-h) + 16px);
  left: 50%;
  transform: translateX(-50%) translateY(12px);
  background: #0f172a;
  color: #fff;
  padding: 10px 20px;
  border-radius: 24px;
  font-size: 14px;
  opacity: 0;
  transition: opacity .2s, transform .2s;
  z-index: 9999;
  white-space: nowrap;
  pointer-events: none;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ── Loading ── */
.loading-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 240px;
}
.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--blue);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Utilities ── */
.hidden { display: none !important; }
.text-center { text-align: center; }
.text-muted { color: var(--text2); }