:root {
    --sc-sidebar-width: 260px;
    --sc-sidebar-collapsed: 64px;
    --sc-sidebar-bg: #fafafa;
    --sc-sidebar-border: #e5e7eb;
    --sc-sidebar-fg: #3f3f46;
    --sc-sidebar-accent: #f4f4f5;
    --sc-sidebar-accent-fg: #18181b;
    --sc-primary: #0f172a;
    --sc-muted: #64748b;
}

[data-bs-theme="dark"] {
    --sc-sidebar-bg: #18181b;
    --sc-sidebar-border: #27272a;
    --sc-sidebar-fg: #f4f4f5;
    --sc-sidebar-accent: #27272a;
    --sc-sidebar-accent-fg: #f4f4f5;
    --sc-primary: #f8fafc;
    --sc-muted: #94a3b8;
    --bs-body-bg: #020817;
    --bs-body-color: #f8fafc;
}

html, body { height: 100%; }
body { font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; }

h1:focus { outline: none; }

/* Shell */
.sc-shell { display: flex; min-height: 100vh; }
.sc-sidebar {
    width: var(--sc-sidebar-width);
    flex: 0 0 var(--sc-sidebar-width);
    background: var(--sc-sidebar-bg);
    border-right: 1px solid var(--sc-sidebar-border);
    color: var(--sc-sidebar-fg);
    position: sticky; top: 0; height: 100vh; overflow-y: auto;
    transition: width .15s ease, flex-basis .15s ease;
}
.sidebar-collapsed .sc-sidebar { width: var(--sc-sidebar-collapsed); flex-basis: var(--sc-sidebar-collapsed); }
.sidebar-collapsed .sc-nav-link span, .sidebar-collapsed .sc-nav-group-toggle span, .sidebar-collapsed .chevron, .sidebar-collapsed .sc-nav-sub, .sidebar-collapsed .sc-brand span { display: none; }
.sidebar-collapsed .sc-nav-children { padding-left: 0; }
.sc-sidebar-inner { display: flex; flex-direction: column; min-height: 100%; }
.sc-brand { display: flex; align-items: center; gap: .5rem; padding: .9rem 1rem; font-weight: 600; color: var(--sc-sidebar-accent-fg); text-decoration: none; }
.sc-nav { flex: 1; padding: 0 .5rem; }
.sc-nav-link, .sc-nav-group-toggle {
    display: flex; align-items: center; gap: .6rem; width: 100%;
    padding: .45rem .6rem; border: 0; border-radius: .4rem; background: transparent;
    color: var(--sc-sidebar-fg); text-decoration: none; font-size: .9rem; text-align: left;
}
.sc-nav-link:hover, .sc-nav-group-toggle:hover { background: var(--sc-sidebar-accent); color: var(--sc-sidebar-accent-fg); }
.sc-nav-link.active { background: var(--sc-sidebar-accent); color: var(--sc-sidebar-accent-fg); font-weight: 600; }
.sc-nav-group-toggle .chevron { margin-left: auto; transition: transform .15s; font-size: .75rem; }
.sc-nav-group-toggle .chevron.open { transform: rotate(90deg); }
.sc-nav-children { padding-left: 1.4rem; display: flex; flex-direction: column; gap: 1px; margin-bottom: .25rem; }
.sc-nav-sub { font-size: .72rem; text-transform: uppercase; letter-spacing: .04em; color: var(--sc-muted); padding: .4rem .6rem 0; }
.sc-sidebar-footer { border-top: 1px solid var(--sc-sidebar-border); padding: .5rem; }
.sc-user { display: flex; align-items: center; gap: .6rem; width: 100%; border: 0; background: transparent; color: var(--sc-sidebar-fg); padding: .4rem; border-radius: .4rem; text-align: left; }
.sc-user:hover { background: var(--sc-sidebar-accent); }
.sc-user-text { display: flex; flex-direction: column; min-width: 0; line-height: 1.2; }
.sc-avatar { width: 32px; height: 32px; border-radius: 50%; background: #3b82f6; color: #fff; display: inline-flex; align-items: center; justify-content: center; font-size: .8rem; font-weight: 600; flex: 0 0 32px; }

.sc-main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.sc-header { display: flex; align-items: center; padding: .6rem 1rem; border-bottom: 1px solid var(--bs-border-color); background: var(--bs-body-bg); position: sticky; top: 0; z-index: 20; }
.sc-content { flex: 1; padding: 1.5rem 2rem; }
.sc-footer { display: flex; align-items: center; justify-content: center; gap: .25rem; padding: 1rem; font-size: .8rem; color: var(--sc-muted); border-top: 1px solid var(--bs-border-color); }

@media (max-width: 991px) {
    .sc-content { padding: 1rem; }
    .sc-sidebar { position: fixed; z-index: 30; }
    .sc-shell:not(.sidebar-collapsed) .sc-main { margin-left: var(--sc-sidebar-width); }
    .sidebar-collapsed .sc-main { margin-left: var(--sc-sidebar-collapsed); }
}

/* Login */
.sc-login { display: grid; grid-template-columns: 1fr 1fr; min-height: 100vh; }
@media (max-width: 991px) { .sc-login { grid-template-columns: 1fr; } }
.sc-login-panel { display: flex; flex-direction: column; justify-content: center; padding: 2.5rem; }
.sc-login-hero { background: url('https://images.unsplash.com/photo-1497435334941-8c899ee9e8e9?auto=format&fit=crop&w=1600&q=80') center/cover no-repeat; }
[data-bs-theme="dark"] .sc-login-hero { filter: brightness(.2) grayscale(1); }

/* Cards & charts */
.sc-card-title { font-size: 1rem; font-weight: 600; margin: 0; }
.sc-chart { min-width: 0; }
.sc-chart-overlay { position: absolute; top: 8px; right: 8px; font-size: .8rem; color: var(--sc-muted); display: flex; align-items: center; background: var(--bs-body-bg); padding: 2px 8px; border-radius: 999px; border: 1px solid var(--bs-border-color); }
.sc-results { position: relative; }
.sc-results-busy { min-height: 10rem; }
.sc-busy-overlay { position: absolute; inset: 0; z-index: 10; background: color-mix(in srgb, var(--bs-body-bg) 70%, transparent); backdrop-filter: blur(1px); border-radius: .5rem; }
.sc-busy-indicator { position: sticky; top: 6rem; display: flex; align-items: center; justify-content: center; gap: .6rem; padding: 2rem 0; font-weight: 500; }
.sc-busy-compact { display: flex; align-items: center; justify-content: center; }
.sc-busy-compact .sc-busy-indicator { position: static; padding: .5rem 0; }
.sc-kpi { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: .75rem; }
/* Values sit at the bottom of each tile, so a row lines up even when a label wraps. */
.sc-kpi > div { display: flex; flex-direction: column; justify-content: space-between; }
/* Same column grid in every group (auto-fill keeps empty tracks), so groups line up under each other. */
.sc-kpi-aligned { grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); }
.sc-kpi .label { font-size: .75rem; color: var(--sc-muted); text-transform: uppercase; letter-spacing: .04em; }
.sc-kpi .value { font-size: 1.15rem; font-weight: 600; }
.sc-amber-card { border-left: 4px solid #f59e0b; background: rgba(245, 158, 11, .08); }
.sc-info-card { border-left: 4px solid #3b82f6; background: rgba(59, 130, 246, .08); }

/* ROI table */
.sc-roi-table { font-size: .82rem; }
.sc-roi-table th, .sc-roi-table td { white-space: nowrap; }
.sc-roi-table th:first-child, .sc-roi-table td:first-child { position: sticky; left: 0; background: var(--bs-body-bg); z-index: 1; min-width: 220px; }
.sc-roi-table tr.section th { background: var(--bs-tertiary-bg); font-weight: 600; }
.sc-roi-table td.break-even, .sc-roi-table th.break-even { background: rgba(16, 185, 129, .15); }
.sc-roi-table tr.total td, .sc-roi-table tr.total th { font-weight: 600; border-top: 2px solid var(--bs-border-color); }

/* Inputs */
.sc-form-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: .75rem 1rem; }
.sc-form-grid label { font-size: .8rem; color: var(--sc-muted); margin-bottom: .15rem; }
.sc-form-subheading { grid-column: 1 / -1; font-size: .85rem; font-weight: 600; padding-bottom: .2rem; margin-top: .25rem; border-bottom: 1px solid var(--bs-border-color); }
.sc-year-tiles { display: grid; grid-template-columns: repeat(5, 1fr); gap: .4rem; }
.sc-year-tile { border: 1px solid var(--bs-border-color); border-radius: .4rem; padding: .25rem .4rem; text-align: center; font-size: .8rem; }

@media print {
    .sc-sidebar, .sc-header, .sc-footer, .no-print { display: none !important; }
    .sc-content { padding: 0; }
    .sc-roi-table { font-size: .7rem; }
}