.site-shell {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.site-header {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.site-header-inner {
    max-width: var(--container);
    margin: 0 auto;
    padding: 16px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.site-brand {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.site-brand-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--heading);
}

.site-brand-subtitle {
    font-size: 0.875rem;
    color: var(--text-soft);
}

.site-main {
    flex: 1;
    width: 100%;
}

.container {
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 24px 20px 40px;
}

.page-header {
    padding-bottom: 18px;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--border);
}

.page-title {
    margin-bottom: 6px;
    font-size: 1.9rem;
}

.page-subtitle {
    color: var(--text-soft);
    margin: 0;
}

.auth-layout {
    min-height: calc(100vh - 73px);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 80px 20px 40px;
}

.auth-wrapper {
    width: 100%;
    max-width: 520px;
}

.auth-content-card {
    max-width: 640px;
    margin: 0 auto;
}

.stack-sm > * + * {
    margin-top: 10px;
}

.stack-md > * + * {
    margin-top: 16px;
}

.stack-lg > * + * {
    margin-top: 24px;
}

.grid-dashboard {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 20px;
    align-items: start;
}

.grid-col-12 {
    grid-column: span 12;
}

.grid-col-6 {
    grid-column: span 6;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.grid-col-6 .card {
    height: auto;
}

.grid-col-4 {
    grid-column: span 4;
}

.grid-col-3 {
    grid-column: span 3;
}

.section-spacer {
    margin-top: 28px;
}

.text-muted {
    color: var(--text-soft);
}

.text-right {
    text-align: right;
}

.divider {
    height: 1px;
    background: var(--border);
    width: 100%;
    margin: 12px 0;
}

.divider-sm {
    height: 1px;
    background: var(--border);
    margin: 8px 0;
}

.detail-list-divider {
    grid-column: 1 / -1;
}

.page-header-inline {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.page-title-inline {
    margin-bottom: 0;
}

.flex-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.detail-actions {
    margin-top: 24px;
    gap: 12px;
    flex-wrap: wrap;
}

.inline-form {
    display: inline;
}

.alert-block-spacing {
    margin-bottom: 16px;
}

@media (max-width: 900px) {
    .grid-col-6,
    .grid-col-4,
    .grid-col-3 {
        grid-column: span 12;
    }

    .site-header-inner {
        padding: 14px 16px;
    }

    .container {
        padding: 20px 16px 32px;
    }

    .page-header {
        padding-bottom: 14px;
        margin-bottom: 18px;
    }

    .page-title {
        font-size: 1.45rem;
        line-height: 1.2;
    }

    .page-subtitle {
        font-size: 0.96rem;
        line-height: 1.45;
        max-width: 42rem;
    }

    .page-header-inline,
    .flex-between {
        align-items: flex-start;
    }
}

@media (max-width: 640px) {
    .site-header-inner {
        gap: 12px;
    }

    .page-header-inline,
    .flex-between {
        flex-direction: column;
        gap: 10px;
    }

    .container {
        padding: 18px 14px 28px;
    }

    .page-title {
        font-size: 1.32rem;
    }

    .page-subtitle {
        font-size: 0.92rem;
    }
}