/* 登录页：和内部台同一套 apple-ui 变量 */
:root { --font-sans: "SF Pro Text", "SF Pro Display", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif; }
body { min-height: 100vh; display: grid; place-items: center; padding: 16px; background: var(--color-bg-secondary); color: var(--color-text);
  font-family: var(--font-sans); font-size: 15px; line-height: 1.55; }
.card { width: 100%; max-width: 400px; background: var(--color-surface); border-radius: var(--radius-xl); box-shadow: var(--shadow-md);
  padding: var(--space-8); display: flex; flex-direction: column; gap: var(--space-3); }
.brand { display: flex; align-items: center; gap: var(--space-2); font-weight: var(--weight-semibold); letter-spacing: -0.02em; margin-bottom: var(--space-4); }
.logo { width: 28px; height: 28px; border-radius: 8px; background: linear-gradient(160deg, #5e5ce6, var(--color-accent)); color: #fff; display: grid; place-items: center; font-size: 0.8rem; }
h1 { font-size: 1.5rem; font-weight: var(--weight-semibold); letter-spacing: -0.02em; }
.muted { color: var(--color-text-secondary); font-size: 0.875rem; }
.au-btn { align-self: flex-start; margin-top: var(--space-2); text-decoration: none; }
.users { list-style: none; padding: 0; margin: var(--space-2) 0 0; display: flex; flex-direction: column; gap: var(--space-2); }
.users a { display: flex; justify-content: space-between; align-items: center; padding: 12px 16px; border-radius: var(--radius-md);
  background: var(--color-bg-secondary); color: var(--color-text); text-decoration: none; transition: background var(--duration-fast) var(--ease-standard); }
.users a:hover { background: color-mix(in srgb, var(--color-accent) 10%, var(--color-bg-secondary)); }
.users small { color: var(--color-text-secondary); font-size: 0.8125rem; }
code { display: block; margin-top: var(--space-2); padding: var(--space-3); background: var(--color-bg-secondary); border-radius: var(--radius-sm); word-break: break-all; font-family: var(--font-mono); font-size: 0.8125rem; }
/* 公开报名页 */
.signup { display: flex; flex-direction: column; gap: var(--space-3); margin-top: var(--space-2); }
.sf { display: flex; flex-direction: column; gap: 4px; font-size: 0.875rem; }
.sf input, .sf select, .sf textarea { font: inherit; padding: 8px 12px; border: 1px solid var(--color-border); border-radius: var(--radius-md); background: var(--color-surface); color: var(--color-text); }
.sf small { color: var(--color-text-tertiary); font-size: 0.75rem; }
/* 报名页的多选（平台） */
fieldset.sf { border: 0; margin: 0; padding: 0; min-width: 0; }
fieldset.sf legend { padding: 0; margin-bottom: 4px; }
.sf .checks { display: flex; flex-wrap: wrap; gap: 6px 14px; }
.sf .checks label { display: inline-flex; align-items: center; gap: 4px; }
.sf .checks input { padding: 0; }
.hp { position: absolute; left: -9999px; }
.err { color: var(--color-danger); font-size: 0.875rem; }