* { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, "PingFang SC", sans-serif; background: #f5f7fb; color: #222; }
.container { max-width: 1180px; margin: 0 auto; padding: 24px; }
.hero { background: linear-gradient(135deg, #173b74, #2c7be5); color: #fff; border-radius: 16px; padding: 28px; margin-bottom: 24px; }
.hero h1 { margin: 0 0 8px; }
.hero p { margin: 0; opacity: 0.95; }
.tip { margin-top: 12px; font-size: 14px; opacity: 0.95; }
.auth { margin-top: 16px; }
.auth a { color: #fff; font-weight: 600; }
.logout-form-inline { display: inline; }
.logout-btn { background: rgba(255,255,255,.15); color: #fff; border: 1px solid rgba(255,255,255,.28); border-radius: 999px; padding: 6px 12px; cursor: pointer; font-weight: 600; }
.logout-btn:hover { background: rgba(255,255,255,.22); }
.platform-card { background: #fff; border-radius: 14px; padding: 20px; margin-bottom: 20px; box-shadow: 0 8px 24px rgba(0,0,0,.06); }
.version-card { border: 1px solid #e7ebf1; border-radius: 12px; padding: 16px; margin-top: 14px; }
.version-title { margin: 0; }
.file-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 16px; margin-top: 12px; }
.file-item { border: 1px solid #edf1f5; border-radius: 10px; padding: 14px; display: flex; justify-content: space-between; gap: 16px; }
.download-action { margin-top: 12px; }
.guide-card { border: 1px solid #dbe7ff; background: linear-gradient(180deg, #f8fbff 0%, #ffffff 100%); }
.guide-card h2 { margin: 0 0 8px; }
.guide-card p { margin: 0; line-height: 1.7; color: #334155; }
.guide-card .meta { margin-top: 10px; }
.button { display: inline-block; background: #2c7be5; color: #fff; text-decoration: none; border-radius: 8px; padding: 10px 14px; font-weight: 600; }
.meta { font-size: 13px; color: #667085; margin-top: 8px; }
.qr-hint { max-width: 160px; }
.qr { width: 160px; height: 160px; object-fit: contain; background: #fff; }
.empty { background: #fff8e1; border: 1px solid #ffe08a; padding: 16px; border-radius: 12px; }
.warn { background: #fff7ed; border: 1px solid #fdba74; color: #9a3412; padding: 8px 10px; border-radius: 8px; margin-top: 10px; font-size: 12px; }
.steps { margin: 14px 0 0; padding-left: 20px; }
.steps li { margin: 6px 0; }