/* ========== Reset & Tokens（全站共用） ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #f5f6fa;
  --surface: #ffffff;
  --surface-2: #eef0f4;
  --border: #dfe3ea;
  --text: #1a1e2e;
  --text-dim: #6b7280;
  --accent: #7c5cff;
  --accent-hover: #6a49f2;
  --accent-weak: rgba(124, 92, 255, .12);
  --radius: 12px;
  --radius-sm: 10px;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

/* ========== 顶部导航 ========== */
.appbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, .9);
  -webkit-backdrop-filter: saturate(180%) blur(8px);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
}
.appbar-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 16px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .95rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}
.brand-logo { width: 26px; height: 26px; border-radius: 7px; display: block; }

.appnav { display: flex; gap: 4px; margin-left: auto; flex-wrap: wrap; }
.appnav a,
.appnav .nav-disabled {
  font-size: .85rem;
  color: var(--text-dim);
  text-decoration: none;
  padding: 6px 12px;
  border-radius: 999px;
  transition: color .2s, background .2s;
}
.appnav a:hover { color: var(--accent); background: var(--surface-2); }
.appnav a.active { color: var(--accent); background: var(--accent-weak); font-weight: 600; }
.appnav .nav-disabled { opacity: .5; cursor: not-allowed; }

/* ========== 顶栏右上角：登录 / 注册 / 账号 ========== */
.appauth { display: flex; align-items: center; gap: 10px; }
.appauth a { font-size: .82rem; color: var(--text-dim); text-decoration: none; }
.appauth a:hover { color: var(--accent); }
.appauth .appauth-primary {
  padding: 5px 12px;
  color: #fff;
  background: var(--accent);
  border-radius: 999px;
}
.appauth .appauth-primary:hover { color: #fff; background: var(--accent-hover); }
.appauth-name { font-size: .8rem; color: var(--text); }
.appauth-out {
  padding: 4px 10px;
  font: inherit;
  font-size: .78rem;
  color: var(--text-dim);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 999px;
  cursor: pointer;
  transition: color .2s, border-color .2s;
}
.appauth-out:hover { color: var(--accent); border-color: var(--accent); }

/* ========== 按钮 ========== */
.btn-primary,
.btn-ghost {
  display: inline-block;
  padding: 11px 20px;
  font: inherit;
  font-size: .9rem;
  text-align: center;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background .2s, color .2s, border-color .2s, opacity .2s;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-primary:disabled { opacity: .55; cursor: not-allowed; }
.btn-ghost { background: #fff; color: var(--text); border-color: var(--border); }
.btn-ghost:hover { color: var(--accent); border-color: var(--accent); }

/* ========== 页脚 ========== */
.appfooter {
  margin-top: auto;
  padding: 24px 16px;
  text-align: center;
  font-size: .75rem;
  color: var(--text-dim);
}