.platform-shell-header {
    position: relative;
    z-index: 40;
    background: #10233d;
    color: #fff;
    border-bottom: 4px solid #a97622;
}

.platform-shell-container {
    max-width: 1180px;
    margin: 0 auto;
    padding-inline: 28px;
}

.platform-shell-topbar {
    min-height: 78px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 18px;
}

.platform-shell-brand {
    color: #fff;
    text-decoration: none;
    font-family: Georgia, "Times New Roman", serif;
    font-size: clamp(1.25rem, 2vw, 1.6rem);
    font-weight: 900;
    letter-spacing: .075em;
    text-transform: uppercase;
    white-space: nowrap;
    display: inline-block;
    line-height: 1;
}

.platform-shell-brand-title { display: block; width: max-content; }
.platform-shell-brand-title span { color: #d5ad62; }
.platform-shell-brand-subtitle {
    display: block;
    color: #d5ad62;
    font-size: .425em;
    letter-spacing: .035em;
    transform: scaleX(1.04);
    transform-origin: left center;
    width: 96.15%;
    margin-top: 4px;
}

.platform-shell-nav {
    display: flex;
    gap: clamp(8px, 1.4vw, 18px);
    flex-wrap: nowrap;
    align-items: center;
    justify-content: flex-end;
    white-space: nowrap;
}

.platform-shell-nav > a {
    color: #f4f0e7;
    text-decoration: none;
    font-weight: 900;
    font-size: clamp(.84rem, 1vw, .98rem);
    padding: 8px 10px;
    border-radius: 999px;
}

.platform-shell-nav > a:hover { background: rgba(255,255,255,.08); color: #d5ad62; }
.platform-shell-nav > a:focus-visible { outline: 3px solid #d5ad62; outline-offset: 3px; }
.platform-shell-login {
    background: linear-gradient(135deg, #e0bd77, #b88935);
    color: #160f07 !important;
    padding: 12px 18px !important;
    box-shadow: 0 8px 18px rgba(83,61,21,.22);
}

.platform-shell-footer {
    background: #10233d;
    color: #cfd8e2;
    padding: 34px 0;
    font: 600 .92rem/1.58 Arial, Helvetica, sans-serif;
    text-align: center;
}

.platform-shell-footer a { color: #d5ad62; text-decoration: none; }
.platform-shell-footer a:hover { text-decoration: underline; }

.platform-bridge-main {
    min-height: calc(100vh - 300px);
    display: grid;
    place-items: center;
    padding: 48px 24px;
    background: #a8aa9e;
}

.platform-bridge-card {
    width: min(760px, 100%);
    padding: clamp(28px, 6vw, 56px);
    color: #10233d;
    background: #eef3e8;
    border: 1px solid #b8a783;
    box-shadow: 0 18px 44px rgba(11,24,40,.2);
    text-align: center;
}

.platform-bridge-card h1 { margin: 0 0 18px; font: 900 clamp(2rem, 6vw, 3.4rem)/1.06 Georgia, "Times New Roman", serif; }
.platform-bridge-card p { margin: 0 auto 24px; max-width: 62ch; font: 600 1.05rem/1.6 Arial, Helvetica, sans-serif; }
.platform-bridge-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; }
.platform-bridge-button {
    min-height: 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 20px;
    border: 2px solid #10233d;
    border-radius: 999px;
    color: #10233d;
    text-decoration: none;
    font: 900 1rem/1.2 Arial, Helvetica, sans-serif;
}
.platform-bridge-button--primary { border-color: #d5ad62; background: #d5ad62; color: #160f07; }

@media (max-width: 940px) {
    .platform-shell-topbar { flex-direction: column; align-items: flex-start; padding-block: 18px; }
    .platform-shell-nav { width: 100%; justify-content: flex-start; flex-wrap: wrap; white-space: normal; }
}

@media (max-width: 620px) {
    .platform-shell-container { padding-inline: 18px; }
    .platform-shell-topbar { gap: 12px; padding-block: 14px; }
    .platform-shell-brand { max-width: 100%; white-space: normal; }
    .platform-shell-brand-title { width: auto; }
    .platform-shell-brand-subtitle { width: auto; transform: none; font-size: .44em; }
}