:root {
    --tool-bg: #f7fafc;
    --tool-card: #ffffff;
    --tool-primary: #0b5f9f;
    --tool-primary-dark: #084f88;
    --tool-accent: #0f9b8e;
    --tool-accent-dark: #08756d;
    --tool-orange: #f47b20;
    --tool-border: #c9dcea;
    --tool-text: #1e2b3a;
    --tool-muted: #596b82;
    --tool-shadow: 0 18px 46px rgba(31, 56, 75, 0.09);
    --tool-soft-blue: #e9f5ff;
    --tool-soft-teal: #e9fbf8;
    --tool-soft-orange: #fff3e9;
    --tool-soft-violet: #f3f0ff;
}

html {
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    color: var(--tool-text);
    background:
        radial-gradient(circle at 8% 18%, rgba(195, 232, 222, 0.58), transparent 28rem),
        linear-gradient(90deg, rgba(11, 95, 159, 0.045) 1px, transparent 1px),
        linear-gradient(180deg, rgba(11, 95, 159, 0.045) 1px, transparent 1px),
        #f8fbfd;
    background-size: auto, 64px 64px, 64px 64px, auto;
    display: flex;
    flex-direction: column;
}

.page-shell {
    flex: 1 0 auto;
}

.site-header {
    background: rgba(249, 252, 255, 0.98);
    border-bottom: 1px solid var(--tool-border);
    flex: 0 0 auto;
    position: sticky;
    top: 0;
    z-index: 1030;
}

.tool-header-nav {
    min-height: 4.75rem;
}

.tool-header-container {
    align-items: center;
    display: grid;
    gap: 1rem;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    min-height: 4.75rem;
    max-width: 1296px;
}

.tool-brand {
    align-items: center;
    color: var(--tool-text);
    display: inline-flex;
    font-size: 1.08rem;
    font-weight: 800;
    gap: 0.6rem;
    min-width: 0;
    text-decoration: none;
}

.tool-brand:hover,
.tool-brand:focus {
    color: var(--tool-accent-dark);
}

.tool-brand-logo {
    display: block;
    filter: drop-shadow(0 10px 18px rgba(11, 95, 159, 0.16));
    height: 2.45rem;
    object-fit: contain;
    width: 2.45rem;
}

.tool-brand-wordmark {
    display: inline-flex;
    font-weight: 850;
    letter-spacing: 0;
}

.brand-gis {
    color: #0b5f9f;
}

.brand-it {
    color: var(--tool-orange);
}

.brand-tools {
    color: #1e2b3a;
}

.tool-header-title {
    line-height: 1.15;
    text-align: center;
}

.tool-name {
    color: #13283c;
    font-size: 1.12rem;
    font-weight: 850;
}

.tool-slogan {
    color: var(--tool-muted);
    font-size: 0.78rem;
    font-weight: 700;
    margin-top: 0.22rem;
}

.tool-header-actions {
    justify-self: end;
}

.tool-dropdown-toggle {
    --bs-btn-padding-x: 0.95rem;
    --bs-btn-padding-y: 0.48rem;
    --bs-btn-border-radius: 999px;
    background: #ffffff;
    border: 1px solid #bfd6e8;
    color: var(--tool-primary);
    font-weight: 800;
}

.tool-dropdown-toggle:hover,
.tool-dropdown-toggle:focus,
.tool-dropdown-toggle.show {
    background: #f2fbfa;
    border-color: rgba(15, 155, 142, 0.5);
    color: var(--tool-primary);
}

.tool-dropdown-menu {
    border: 1px solid var(--tool-border);
    border-radius: 8px;
    box-shadow: var(--tool-shadow);
    padding: 0.4rem;
}

.tool-dropdown-menu .dropdown-item {
    border-radius: 6px;
    font-weight: 700;
}

.site-footer {
    border-top: 1px solid var(--tool-border);
    flex: 0 0 auto;
    color: var(--tool-muted);
    background: #ffffff;
}

.hero-copy {
    background:
        linear-gradient(120deg, rgba(255, 255, 255, 0.94), rgba(248, 252, 255, 0.94)),
        linear-gradient(90deg, rgba(11, 95, 159, 0.04) 1px, transparent 1px),
        linear-gradient(180deg, rgba(11, 95, 159, 0.04) 1px, transparent 1px);
    background-size: auto, 48px 48px, 48px 48px;
    border: 1px solid var(--tool-border);
    border-radius: 16px;
    box-shadow: 0 18px 48px rgba(31, 56, 75, 0.08);
    margin: 0 auto 0.35rem;
    padding: 1.7rem 2rem;
}

.eyebrow {
    color: var(--tool-accent);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.08rem;
    text-transform: uppercase;
}

.card,
.calculator-card,
.result-card,
.content-card {
    border: 1px solid var(--tool-border);
    border-radius: 12px;
    box-shadow: var(--tool-shadow);
}

.calculator-card,
.result-card,
.content-card {
    background: var(--tool-card);
}

.calculator-card {
    background:
        linear-gradient(145deg, rgba(255, 255, 255, 0.98), rgba(246, 252, 255, 0.98)),
        radial-gradient(circle at top right, rgba(244, 123, 32, 0.12), transparent 18rem);
    overflow: hidden;
}

.calculator-card .card-body {
    position: relative;
}

.calculator-card .card-body::before {
    background: linear-gradient(90deg, var(--tool-primary), var(--tool-accent), var(--tool-orange));
    content: "";
    height: 0.28rem;
    left: 0;
    position: absolute;
    right: 0;
    top: 0;
}

.result-card {
    background:
        linear-gradient(140deg, rgba(233, 251, 248, 0.98), rgba(255, 255, 255, 0.96)),
        radial-gradient(circle at 90% 10%, rgba(11, 95, 159, 0.12), transparent 18rem);
}

.form-section-title {
    align-items: center;
    display: flex;
    gap: 0.85rem;
}

.form-label {
    align-items: center;
    display: inline-flex;
    gap: 0.45rem;
}

.icon-badge {
    align-items: center;
    border-radius: 999px;
    display: inline-flex;
    flex: 0 0 auto;
    font-size: 0.78rem;
    font-weight: 900;
    height: 1.7rem;
    justify-content: center;
    line-height: 1;
    width: 1.7rem;
}

.icon-badge-shape {
    background: linear-gradient(135deg, #e7f2ff, #d7eaff);
    color: var(--tool-primary);
}

.icon-badge-unit {
    background: linear-gradient(135deg, #e8fbf6, #c9f1ea);
    color: var(--tool-accent-dark);
}

.icon-badge-input {
    background: linear-gradient(135deg, #fff2e8, #ffe2cb);
    color: #b75b14;
}

.icon-badge-formula {
    background: linear-gradient(135deg, #f2f0ff, #ded8ff);
    color: #5941a9;
}

.icon-badge-result {
    background: linear-gradient(135deg, #e8f8ee, #c9edd7);
    color: #136d39;
}

.calculator-alert {
    background: linear-gradient(135deg, #fff5f4, #fff);
    border: 1px solid #f1b6ae;
    border-radius: 12px;
    box-shadow: 0 14px 34px rgba(156, 45, 34, 0.08);
    color: #9a3027;
    font-weight: 750;
}

.form-control,
.form-select {
    border-color: var(--tool-border);
}

.form-control:focus,
.form-select:focus {
    border-color: rgba(24, 167, 167, 0.7);
    box-shadow: 0 0 0 0.22rem rgba(24, 167, 167, 0.14);
}

.btn-primary {
    --bs-btn-bg: transparent;
    --bs-btn-border-color: transparent;
    --bs-btn-hover-bg: transparent;
    --bs-btn-hover-border-color: transparent;
    background: linear-gradient(135deg, var(--tool-primary), var(--tool-accent));
    border: 0;
    box-shadow: 0 12px 24px rgba(11, 95, 159, 0.22);
    font-weight: 850;
    transition: box-shadow 0.18s ease, transform 0.18s ease;
}

.btn-primary:hover,
.btn-primary:focus {
    background: linear-gradient(135deg, var(--tool-primary-dark), var(--tool-accent-dark));
    box-shadow: 0 16px 30px rgba(11, 95, 159, 0.28);
    transform: translateY(-1px);
}

.btn-outline-primary {
    --bs-btn-color: var(--tool-primary);
    --bs-btn-border-color: rgba(15, 115, 201, 0.45);
    --bs-btn-hover-bg: var(--tool-primary);
    --bs-btn-hover-border-color: var(--tool-primary);
    background: rgba(255, 255, 255, 0.72);
    font-weight: 800;
}

.input-grid {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.formula-preview {
    align-items: center;
    background:
        linear-gradient(135deg, rgba(243, 240, 255, 0.92), rgba(248, 251, 253, 0.96)),
        #f8fbfd;
    border: 1px solid var(--tool-border);
    border-radius: 12px;
    color: #13283c;
    display: flex;
    gap: 0.8rem;
    font-weight: 850;
    padding: 0.9rem 1rem;
}

.formula-preview span:not(.icon-badge) {
    color: var(--tool-muted);
    display: block;
    font-size: 0.82rem;
    font-weight: 800;
    margin-bottom: 0.1rem;
}

.formula-preview strong {
    color: #13283c;
    display: block;
    font-size: 1.02rem;
}

.result-detail-grid {
    display: grid;
    gap: 0.85rem;
    margin-top: 1rem;
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.result-detail-grid div,
.conversion-card {
    background: rgba(255, 255, 255, 0.84);
    border: 1px solid var(--tool-border);
    border-radius: 10px;
    padding: 1rem;
}

.result-detail-grid div:nth-child(1) {
    background: var(--tool-soft-violet);
}

.result-detail-grid div:nth-child(2) {
    background: var(--tool-soft-orange);
}

.result-detail-grid div:nth-child(3) {
    background: var(--tool-soft-teal);
}

.result-detail-grid span,
.conversion-title {
    align-items: center;
    color: var(--tool-muted);
    display: flex;
    font-size: 0.88rem;
    gap: 0.45rem;
    font-weight: 800;
    margin-bottom: 0.25rem;
}

.result-detail-grid strong,
.conversion-panel strong {
    color: #122b40;
    display: block;
    font-weight: 850;
    overflow-wrap: anywhere;
}

.conversion-panel {
    display: grid;
    gap: 0.7rem;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.conversion-title {
    grid-column: 1 / -1;
    margin-bottom: 0;
}

.conversion-card span {
    color: var(--tool-muted);
    display: block;
    font-size: 0.82rem;
    font-weight: 800;
    margin-bottom: 0.2rem;
}

.result-panel {
    align-items: center;
    background:
        linear-gradient(135deg, rgba(11, 95, 159, 0.1), rgba(15, 155, 142, 0.14)),
        #ffffff;
    border: 1px solid rgba(15, 155, 142, 0.28);
    border-radius: 14px;
    display: flex;
    gap: 0.9rem;
    padding: 1.15rem;
}

.result-panel .icon-badge {
    height: 2.4rem;
    width: 2.4rem;
}

.content-section {
    background: #ffffff;
    border-top: 1px solid rgba(113, 154, 184, 0.22);
}

.content-card {
    padding: 1.25rem;
}

.content-card h2 {
    font-size: 1.35rem;
    font-weight: 800;
    margin-top: 1.4rem;
}

.content-card h2:first-child {
    margin-top: 0;
}

.content-card p,
.content-card li {
    color: var(--tool-muted);
}

.formula-list {
    display: grid;
    gap: 0.4rem;
}

.error-card {
    max-width: 620px;
}

@media (max-width: 992px) {
    .result-detail-grid {
        grid-template-columns: 1fr;
    }

    .conversion-panel {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .tool-header-nav {
        min-height: auto;
    }

    .tool-header-container {
        gap: 0.65rem;
        grid-template-columns: 1fr auto;
        min-height: auto;
        padding-bottom: 0.75rem;
        padding-top: 0.75rem;
    }

    .tool-brand {
        font-size: 0.95rem;
    }

    .tool-brand-logo {
        height: 1.9rem;
        width: 1.9rem;
    }

    .tool-header-title {
        grid-column: 1 / -1;
        grid-row: 2;
        text-align: left;
    }

    .tool-header-actions {
        grid-column: 2;
        grid-row: 1;
    }

    .tool-name {
        font-size: 1rem;
    }

    .hero-copy {
        padding: 1.25rem;
    }

    .input-grid {
        grid-template-columns: 1fr;
    }
}