/* Shared application shell: four applications use identical dimensions and controls. */
:root{--iivd-shell-height:64px;--iivd-ink:#21364a;--iivd-line:#e0e6eb;--iivd-accent:#d76b28;scroll-padding-top:80px}
.iivd-app-header,.iivd-app-header *{box-sizing:border-box}
header.iivd-app-header{position:sticky;top:0;z-index:1000;height:var(--iivd-shell-height);width:100%;margin:0;padding:0;background:#fff;border:0;border-bottom:1px solid var(--iivd-line);color:var(--iivd-ink);font:14px/1.5 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;transition:box-shadow .15s}
header.iivd-app-header.is-scrolled{box-shadow:0 3px 12px #21364a0c}
.iivd-app-header .iivd-shell-inner{width:100%;max-width:1680px;height:100%;margin:0 auto;padding:0 32px;display:flex;align-items:center;gap:18px;min-width:0}
.iivd-app-header a{color:var(--iivd-ink);text-decoration:none;letter-spacing:0}
.iivd-app-header a:hover{color:#b65317;text-decoration:none}
.iivd-app-header .iivd-shell-brand{display:flex;align-items:center;gap:9px;flex:none;font-size:18px;font-weight:700;white-space:nowrap}
.iivd-app-header .iivd-shell-brand img{display:block;width:22px;height:32px;object-fit:contain;border:0;border-radius:0;background:none}
.iivd-app-header .iivd-shell-divider{height:23px;width:1px;background:#dfe5ea;flex:none}
.iivd-app-header .iivd-shell-app{font-size:18px;font-weight:650;white-space:nowrap}
.iivd-app-header .iivd-shell-actions{display:flex;align-items:center;gap:24px;margin:0 0 0 auto;padding:0;overflow:visible;flex:none;font-size:14px}
.iivd-app-header .iivd-shell-ask{color:#6c7c8c;font-size:14px;font-weight:500;white-space:nowrap;padding:8px 0}
.iivd-app-header .iivd-shell-switch{position:relative;margin:0;border:0;padding:0;background:none}
.iivd-app-header .iivd-shell-switch summary{display:flex;align-items:center;gap:8px;cursor:pointer;padding:9px 0;color:#657587;font-weight:500;list-style:none;white-space:nowrap}
.iivd-app-header summary::-webkit-details-marker{display:none}
.iivd-app-header .iivd-shell-switch[open] summary{color:#b65317}
.iivd-app-header .iivd-shell-menu{position:absolute;right:0;top:calc(100% + 9px);width:200px;padding:7px;background:#fff;border:1px solid var(--iivd-line);border-radius:10px;box-shadow:0 10px 30px #21364a19;max-height:calc(100dvh - 80px);overflow:auto}
.iivd-app-header .iivd-shell-menu a{display:block;padding:11px 13px;border:0;border-radius:6px;margin:0;font-size:14px;font-weight:500;line-height:1.5;background:#fff}
.iivd-app-header .iivd-shell-menu a:hover{background:#f5f7f9}
.iivd-app-header .iivd-shell-unavailable{display:flex;align-items:center;justify-content:space-between;padding:11px 13px;color:#8b98a5;cursor:default;font-size:14px}.iivd-app-header .iivd-shell-unavailable small{font-size:10px;color:#9aa5b0;background:#f4f6f8;border-radius:4px;padding:1px 5px}
.iivd-app-header .iivd-shell-menu a[aria-current=page]{color:#b65317;background:#fff3e8}
.iivd-app-header .iivd-shell-menu .academy-management-entry{border-top:1px solid var(--iivd-line);border-radius:0;margin-top:6px;color:#b65317}
.iivd-app-header .iivd-shell-mobile{display:none!important}
.iivd-app-header a:focus-visible,.iivd-app-header summary:focus-visible{outline:2px solid #d76b28;outline-offset:4px}
body.iivd-app-surface>main{max-width:1680px;margin-left:auto;margin-right:auto;padding-left:32px;padding-right:32px}body.iivd-app-surface>main .library.wrap{width:100%;padding-left:0;padding-right:0}body.iivd-app-surface>.foot{max-width:1680px;padding-left:32px;padding-right:32px}
@media(max-width:600px){:root{--iivd-shell-height:56px;scroll-padding-top:72px}.iivd-app-header .iivd-shell-inner{padding:0 16px;gap:11px}.iivd-app-header .iivd-shell-brand{font-size:16px;gap:7px}.iivd-app-header .iivd-shell-brand img{width:19px;height:28px}.iivd-app-header .iivd-shell-app{font-size:16px}.iivd-app-header .iivd-shell-divider{height:19px}.iivd-app-header .iivd-shell-actions{gap:0}.iivd-app-header .iivd-shell-ask,.iivd-app-header .iivd-shell-desktop{display:none!important}.iivd-app-header .iivd-shell-mobile{display:block!important}.iivd-app-header .iivd-shell-menu{width:195px}.iivd-app-header .iivd-shell-switch summary{font-size:13px;gap:5px}body.iivd-app-surface>main,body.iivd-app-surface>.foot{padding-left:16px;padding-right:16px}}