:root {
    --it-ink: #152238;
    --it-muted: #64748b;
    --it-soft: #f5f7fb;
    --it-soft-2: #eef7f4;
    --it-primary: #116466;
    --it-primary-dark: #0b4748;
    --it-accent: #2d9c72;
    --it-border: rgba(21, 34, 56, .1);
    --it-shadow: 0 1rem 2.5rem rgba(21, 34, 56, .08);
    --it-radius-lg: 1.5rem;
    --it-radius-md: 1rem;
}

body {
    color: var(--it-ink);
    background:
        radial-gradient(circle at top left, rgba(45, 156, 114, .12), transparent 32rem),
        linear-gradient(180deg, #fbfcff 0%, #f7f9fc 38%, #ffffff 100%);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a {
    color: var(--it-primary);
}

.site-shell {
    overflow: hidden;
}

.navbar {
    --bs-navbar-color: var(--it-ink);
    --bs-navbar-hover-color: var(--it-primary);
    --bs-navbar-active-color: var(--it-primary);
    backdrop-filter: blur(18px);
    background: rgba(255, 255, 255, .88);
    border-bottom: 1px solid var(--it-border);
}

.brand-mark {
    width: 2.35rem;
    height: 2.35rem;
    border-radius: .85rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    background: linear-gradient(135deg, var(--it-primary), var(--it-accent));
    box-shadow: 0 .75rem 1.4rem rgba(17, 100, 102, .22);
}

.nav-pill {
    border-radius: 999px;
}

.btn-primary {
    --bs-btn-bg: var(--it-primary);
    --bs-btn-border-color: var(--it-primary);
    --bs-btn-hover-bg: var(--it-primary-dark);
    --bs-btn-hover-border-color: var(--it-primary-dark);
}

.btn-outline-primary {
    --bs-btn-color: var(--it-primary);
    --bs-btn-border-color: rgba(17, 100, 102, .35);
    --bs-btn-hover-bg: var(--it-primary);
    --bs-btn-hover-border-color: var(--it-primary);
}

.hero {
    padding: 6.5rem 0 3rem;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    border: 1px solid rgba(17, 100, 102, .18);
    background: rgba(255, 255, 255, .75);
    color: var(--it-primary-dark);
    border-radius: 999px;
    padding: .45rem .75rem;
    font-size: .9rem;
    font-weight: 600;
}

.hero-title {
    letter-spacing: -.045em;
    line-height: 1.03;
}

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

.utility-card,
.calculator-preview {
    background: rgba(255, 255, 255, .92);
    border: 1px solid var(--it-border);
    border-radius: var(--it-radius-lg);
    box-shadow: var(--it-shadow);
}

.calculator-preview .form-control,
.calculator-preview .form-select {
    border-radius: .85rem;
    border-color: rgba(21, 34, 56, .16);
    padding: .75rem .9rem;
}

.result-tile {
    border-radius: 1rem;
    background: linear-gradient(135deg, #effaf6, #f7fbff);
    border: 1px solid rgba(17, 100, 102, .12);
}

.section-pad {
    padding: 3.75rem 0;
}

.section-eyebrow {
    color: var(--it-primary);
    text-transform: uppercase;
    letter-spacing: .1em;
    font-weight: 800;
    font-size: .76rem;
}

.tool-card {
    height: 100%;
    border: 1px solid var(--it-border);
    border-radius: var(--it-radius-md);
    background: #fff;
    transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.tool-card:hover,
.tool-card:focus-within {
    transform: translateY(-3px);
    box-shadow: 0 1rem 2.25rem rgba(21, 34, 56, .09);
    border-color: rgba(17, 100, 102, .25);
}

.tool-icon {
    width: 2.65rem;
    height: 2.65rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: .95rem;
    background: var(--it-soft-2);
    color: var(--it-primary);
    font-size: 1.25rem;
}

.mini-stat {
    border-radius: var(--it-radius-md);
    background: var(--it-soft);
    border: 1px solid var(--it-border);
}

.footer {
    border-top: 1px solid var(--it-border);
    background: #fff;
}

.footer a {
    color: var(--it-muted);
    text-decoration: none;
}

.footer a:hover {
    color: var(--it-primary);
}

.page-hero-small {
    padding: 6rem 0 2rem;
    background: linear-gradient(180deg, rgba(238, 247, 244, .75), rgba(255,255,255,0));
}

.placeholder-box {
    border: 1px dashed rgba(17, 100, 102, .35);
    background: rgba(238, 247, 244, .42);
    border-radius: var(--it-radius-lg);
}

@media (min-width: 768px) {
    .hero {
        padding: 8rem 0 4.25rem;
    }

    .section-pad {
        padding: 5rem 0;
    }
}

/* Calculator page */
.calculator-page .form-control,
.calculator-page .form-select,
.calculator-preview .form-control,
.calculator-preview .form-select {
    border-radius: 1rem;
    min-height: 44px;
}
.calculator-page .input-group .form-control { border-radius: 0 1rem 1rem 0; }
.calculator-page .input-group .input-group-text { border-radius: 1rem 0 0 1rem; }
.calculator-panel { position: sticky; top: 96px; }
.chart-wrap {
    border: 1px solid rgba(13, 110, 253, .12);
    border-radius: 1.5rem;
    background: linear-gradient(180deg, rgba(255,255,255,.96), rgba(247,250,255,.96));
    padding: 1rem;
}
.chart-wrap canvas { width: 100%; height: 360px; display: block; }
.comparison-card {
    border: 1px solid rgba(13, 110, 253, .12);
    border-radius: 1.25rem;
    background: rgba(13, 110, 253, .04);
}
.formula-box {
    white-space: pre-wrap;
    border-radius: 1.25rem;
    border: 1px solid rgba(0,0,0,.08);
    background: #f8fafc;
    padding: 1rem;
}
#monthlyAccordion .accordion-item {
    border: 1px solid rgba(0,0,0,.08);
    border-radius: 1rem;
    overflow: hidden;
    margin-bottom: .75rem;
}
#monthlyAccordion .accordion-button { font-weight: 700; }
@media (max-width: 1199.98px) {
    .calculator-panel { position: static; }
}

.yearly-summary-card {
    border: 1px solid rgba(13, 110, 253, .10);
    border-radius: 1.25rem;
    background: rgba(255,255,255,.72);
    overflow: hidden;
}
.yearly-summary-card .table { margin-bottom: 0; }
.yearly-summary-card .table th,
.yearly-summary-card .table td { white-space: nowrap; }
.yearly-summary-card .table thead th {
    background: #f8fafc;
    border-bottom-width: 1px;
    font-size: .9rem;
}
.chart-wrap {
    border: 1px solid rgba(0, 0, 0, .08);
    border-radius: 1rem;
    background: #ffffff;
    padding: 1rem;
}
.chart-wrap canvas { width: 100%; height: 430px; display: block; }
@media (max-width: 767.98px) {
    .chart-wrap canvas { height: 320px; }
}