:root {
    --bg: #f8fafc;
    --bg-soft: #f1f5f9;
    --text: #0b1220;
    --muted: #5f6f85;
    --card: #ffffff;
    --card-border: #d8e2ee;
    --brand: #1d4ed8;
    --brand-strong: #1e40af;
    --brand-soft: #e8efff;
    --footer-bg-top: #0b1424;
    --footer-bg-bottom: #16233b;
    --footer-text: #c8d3e2;
    --footer-title: #f8fafc;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
}

.site-body {
    min-height: 100vh;
    background:
        radial-gradient(circle at 0% 0%, rgba(30, 64, 175, 0.08), transparent 34%),
        radial-gradient(circle at 100% 100%, rgba(29, 78, 216, 0.06), transparent 36%),
        linear-gradient(180deg, var(--bg) 0%, var(--bg-soft) 100%);
    color: var(--text);
    font-feature-settings: "tnum" 1;
}

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

.site-content {
    flex: 1;
    position: relative;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 30;
    background: rgba(255, 255, 255, 0.9);
    border-bottom: 1px solid var(--card-border);
    box-shadow: 0 10px 28px rgba(15, 23, 42, 0.05);
    backdrop-filter: blur(12px);
}

.site-header-inner {
    margin: 0 auto;
    max-width: 76rem;
    padding: 0.85rem 1.5rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    position: relative;
}

.site-brand {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
    color: inherit;
}

.brand-mark {
    width: 2.15rem;
    height: 2.15rem;
    border-radius: 0.42rem;
    background: linear-gradient(135deg, var(--brand-strong), var(--brand));
    color: #ffffff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    font-weight: 800;
    text-transform: uppercase;
    box-shadow: 0 9px 18px rgba(30, 64, 175, 0.28);
}

.brand-mark-icon {
    display: block;
    width: 1.2rem;
    height: 1.2rem;
}

.brand-text {
    font-weight: 800;
    letter-spacing: -0.015em;
    font-size: 1.08rem;
    text-transform: uppercase;
}

.site-nav {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.45rem;
}

.site-nav-toggle {
    display: none;
    border: 1px solid var(--card-border);
    background: #ffffff;
    color: #0f172a;
    border-radius: 0.65rem;
    padding: 0.45rem 0.65rem;
    font-size: 0.85rem;
    font-weight: 700;
}

.site-nav-link {
    text-decoration: none;
    color: #344155;
    font-weight: 600;
    font-size: 0.84rem;
    letter-spacing: 0.01em;
    padding: 0.42rem 0.72rem;
    border-radius: 0.5rem;
    transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.site-nav-link:hover {
    background: #edf2ff;
    color: var(--text);
}

.site-nav-link.active {
    background: var(--brand-soft);
    color: var(--brand-strong);
}

.site-nav-dropdown {
    position: relative;
}

.site-nav-dropdown > summary {
    list-style: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.site-nav-dropdown > summary::-webkit-details-marker {
    display: none;
}

.site-nav-dropdown > summary::after {
    content: "▾";
    font-size: 0.72rem;
    line-height: 1;
    color: #64748b;
    transition: transform 0.15s ease;
}

.site-nav-dropdown[open] > summary::after {
    transform: rotate(180deg);
}

.site-nav-panel {
    display: none;
    position: absolute;
    top: calc(100% + 0.35rem);
    left: 0;
    min-width: 18rem;
    background: #ffffff;
    border: 1px solid var(--card-border);
    border-radius: 0.7rem;
    padding: 0.7rem;
    box-shadow: 0 18px 38px rgba(15, 23, 42, 0.12);
    z-index: 40;
}

.site-nav-panel-simple {
    min-width: 14rem;
    padding: 0.55rem;
}

.site-nav-dropdown[open] .site-nav-panel,
.site-nav-dropdown:hover .site-nav-panel {
    display: block;
}

.site-nav-dropdown-accordion .site-nav-panel {
    display: none;
    width: min(27rem, calc(100vw - 3rem));
    min-width: 0;
}

.site-nav-dropdown-accordion:hover .site-nav-panel {
    display: none;
}

.site-nav-dropdown-accordion[open] .site-nav-panel,
.site-nav-dropdown-accordion[open]:hover .site-nav-panel {
    display: block;
}

.site-nav-group + .site-nav-group {
    margin-top: 0.65rem;
    padding-top: 0.65rem;
    border-top: 1px solid var(--card-border);
}

.site-nav-group-title {
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.02em;
    color: #64748b;
    margin-bottom: 0.45rem;
}

.site-nav-sub {
    display: block;
    text-decoration: none;
    color: #1e293b;
    font-size: 0.86rem;
    border-radius: 0.5rem;
    padding: 0.4rem 0.5rem;
}

.site-nav-sub:hover {
    background: #eff3ff;
}

.site-nav-panel-accordion {
    padding: 0.55rem;
    max-height: min(70vh, 34rem);
    overflow: auto;
}

.site-nav-categories {
    row-gap: 0.55rem;
}

.site-nav-accordion + .site-nav-accordion {
    margin-top: 0.35rem;
    padding-top: 0.35rem;
    border-top: 1px solid var(--card-border);
}

.site-nav-accordion-title {
    list-style: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding: 0.48rem 0.55rem;
    border-radius: 0.6rem;
    font-size: 0.82rem;
    font-weight: 800;
    letter-spacing: 0.02em;
    color: #1e293b;
}

.site-nav-accordion-title::-webkit-details-marker {
    display: none;
}

.site-nav-accordion-title::after {
    content: "▾";
    flex: none;
    font-size: 0.72rem;
    color: #64748b;
    transition: transform 0.15s ease;
}

.site-nav-accordion[open] > .site-nav-accordion-title {
    background: #f8fbff;
}

.site-nav-accordion[open] > .site-nav-accordion-title::after {
    transform: rotate(180deg);
}

.site-nav-accordion-list {
    list-style: none;
    margin: 0.28rem 0 0;
    padding: 0;
    display: grid;
    gap: 0.08rem;
}

.site-nav-accordion-list .site-nav-sub {
    padding: 0.4rem 0.55rem;
    font-size: 0.84rem;
}

.site-footer {
    border-top: 1px solid #253756;
    background:
        radial-gradient(circle at 0% 0%, rgba(29, 78, 216, 0.2), transparent 42%),
        linear-gradient(160deg, var(--footer-bg-top) 0%, var(--footer-bg-bottom) 100%);
}

.site-footer-inner {
    margin: 0 auto;
    max-width: 76rem;
    padding: 1.8rem 1.5rem;
    display: grid;
    grid-template-columns: minmax(0, 1.3fr) repeat(3, minmax(0, 1fr));
    align-items: start;
    column-gap: 1.6rem;
    row-gap: 1.2rem;
    color: var(--footer-text);
    font-size: 0.86rem;
}

.footer-column {
    display: grid;
    align-content: start;
    gap: 0.65rem;
}

.footer-brand p {
    margin: 0;
    line-height: 1.35;
}

.footer-brand p:first-child {
    font-weight: 800;
    color: var(--footer-title);
    letter-spacing: 0.015em;
}

.footer-note {
    margin-top: 0.2rem;
    font-size: 0.8rem;
    color: #9eb0c6;
    max-width: 26ch;
}

.footer-heading {
    margin: 0;
    font-size: 0.72rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    font-weight: 800;
    color: #b8c8e0;
}

.footer-links {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 0.45rem;
}

.footer-links li {
    margin: 0;
}

.footer-links a {
    text-decoration: none;
    color: #d3e0f5;
    font-weight: 600;
    font-size: 0.83rem;
    line-height: 1.35;
    transition: color 0.15s ease, transform 0.15s ease;
}

.footer-links a:hover {
    color: #ffffff;
    transform: translateX(1px);
}

@media (max-width: 767px) {
    .site-header-inner {
        align-items: center;
        justify-content: space-between;
    }

    .site-nav-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .site-nav {
        display: none;
        width: 100%;
        order: 3;
        margin-top: 0.15rem;
        background: #ffffff;
        border: 1px solid var(--card-border);
        border-radius: 0.75rem;
        padding: 0.4rem;
    }

    .site-nav.open {
        display: flex;
        flex-direction: column;
        align-items: stretch;
    }

    .site-nav-link {
        width: 100%;
    }

    .site-nav-dropdown {
        width: 100%;
    }

    .site-nav-panel {
        position: static;
        display: none;
        min-width: 0;
        margin-top: 0.35rem;
        box-shadow: none;
    }

    .site-nav-dropdown[open] .site-nav-panel {
        display: block;
    }

    .site-nav-dropdown-accordion .site-nav-panel,
    .site-nav-dropdown-accordion[open] .site-nav-panel,
    .site-nav-dropdown-accordion:hover .site-nav-panel,
    .site-nav-dropdown-accordion[open]:hover .site-nav-panel {
        width: 100%;
        max-height: none;
        overflow: visible;
        left: auto;
        right: auto;
    }

    .site-nav-panel-accordion {
        padding: 0.35rem;
    }

    .site-footer-inner {
        grid-template-columns: 1fr;
        align-items: start;
    }

    .footer-column {
        gap: 0.55rem;
    }
}

.site-main {
    position: relative;
    margin: 0 auto;
    max-width: 76rem;
    padding: 2.8rem 1.5rem;
}

.surface {
    width: 100%;
    border-radius: 1.15rem;
    border: 1px solid var(--card-border);
    background: var(--card);
    box-shadow: 0 24px 46px rgba(15, 23, 42, 0.08);
    padding: 2rem;
}

.home-hero {
    max-width: 46rem;
}

.home-title {
    margin: 1rem 0 0;
    font-size: clamp(2.1rem, 4vw, 4rem);
    line-height: 1.02;
    letter-spacing: -0.05em;
    font-weight: 800;
    color: #081120;
}

.home-subtitle {
    margin: 1rem 0 0;
    max-width: 38rem;
    color: #55657d;
    font-size: 1rem;
    line-height: 1.7;
}

.category-grid {
    margin-top: 2.25rem;
    display: grid;
    gap: 1rem;
}

.category-panel {
    position: relative;
    overflow: hidden;
    border-radius: 1.1rem;
    border: 1px solid rgba(191, 210, 234, 0.9);
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.96) 0%, rgba(243, 248, 255, 0.92) 100%);
    padding: 1.2rem;
    box-shadow: 0 14px 30px rgba(15, 23, 42, 0.05);
}

.category-panel::before {
    content: "";
    position: absolute;
    inset: 0 auto auto 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, rgba(30, 64, 175, 0.9), rgba(59, 130, 246, 0.28));
}

.category-panel-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.category-title {
    margin: 0;
    font-size: 1rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: #0f172a;
}

.category-count {
    flex: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 9999px;
    padding: 0.32rem 0.65rem;
    background: #e8f0ff;
    color: #2447a6;
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.tool-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem;
}

.tool-list li {
    margin: 0;
}

.tool-pill {
    display: inline-flex;
    align-items: center;
    min-height: 2.5rem;
    border-radius: 9999px;
    border: 1px solid #d6e3f7;
    background: rgba(255, 255, 255, 0.96);
    padding: 0.58rem 0.9rem;
    text-decoration: none;
    color: #15304f;
    font-size: 0.9rem;
    font-weight: 700;
    line-height: 1.2;
    transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
}

.tool-pill:hover {
    transform: translateY(-1px);
    border-color: #a9c0eb;
    background: #ffffff;
    box-shadow: 0 10px 22px rgba(30, 64, 175, 0.1);
}

.muted {
    color: var(--muted);
    line-height: 1.65;
}

.site-main > header {
    max-width: 56rem;
}

.site-main > header h1 {
    letter-spacing: -0.03em;
}

.site-main > header p {
    margin-top: 0.55rem;
}

.card-grid {
    margin-top: 2rem;
    display: grid;
    gap: 1rem;
}

@media (min-width: 768px) {
    .category-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .card-grid-2 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .card-grid-3 {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .card-grid-4 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .card-grid-6 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .site-footer-inner {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (min-width: 1024px) {
    .category-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .card-grid-4 {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }

    .card-grid-6 {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .site-footer-inner {
        grid-template-columns: minmax(0, 1.3fr) repeat(3, minmax(0, 1fr));
    }
}

.tool-card {
    position: relative;
    overflow: hidden;
    border-radius: 1rem;
    border: 1px solid var(--card-border);
    background: var(--card);
    padding: 1.45rem;
    text-decoration: none;
    color: inherit;
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.05);
    transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.tool-card::before {
    content: "";
    position: absolute;
    inset: 0 auto auto 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, rgba(29, 78, 216, 0.65), rgba(56, 189, 248, 0));
}

    .tool-card:hover {
        transform: translateY(-2px);
        border-color: #bfd3f7;
        box-shadow: 0 16px 34px rgba(30, 64, 175, 0.12);
    }

@media (max-width: 767px) {
    .home-title {
        font-size: 2rem;
    }

    .category-panel {
        padding: 1rem;
    }

    .category-panel-head {
        align-items: flex-start;
        flex-direction: column;
    }

    .tool-list {
        gap: 0.55rem;
    }

    .tool-pill {
        width: 100%;
        justify-content: center;
    }
}

.stack-sm {
    margin-top: 1rem;
    display: grid;
    gap: 0.75rem;
}

.field {
    width: 100%;
    border-radius: 0.68rem;
    border: 1px solid var(--card-border);
    background: #fcfdff;
    padding: 0.75rem 1rem;
    outline: none;
    color: inherit;
    font-weight: 600;
}

.field::placeholder {
    color: #64748b;
}

.field:focus {
    border-color: #9cbcf2;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.14);
}

.result-box {
    margin-top: 1rem;
    border-radius: 0.7rem;
    border: 1px solid #d8e4fb;
    padding: 1rem;
    font-size: 0.875rem;
}

.result-inline {
    margin-top: 1rem;
    font-size: 0.875rem;
}

.badge {
    display: inline-flex;
    align-items: center;
    border-radius: 9999px;
    border: 1px solid;
    padding: 0.3rem 0.8rem;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    text-decoration: none;
}

.accent-cyan {
    color: var(--brand-strong);
}

.accent-cyan-soft {
    background: #eef4ff;
    border-color: #c7dcff;
}

.accent-emerald {
    color: var(--brand-strong);
}

.accent-emerald-soft {
    background: #eef4ff;
    border-color: #c7dcff;
}

.accent-sky {
    color: var(--brand);
}

.accent-sky-soft {
    background: #eef4ff;
    border-color: #c7dcff;
}

.accent-amber {
    color: var(--brand-strong);
}

.accent-amber-soft {
    background: #eef4ff;
    border-color: #c7dcff;
}

.span-2 {
    grid-column: auto;
}

@media (min-width: 768px) {
    .span-2 {
        grid-column: span 2 / span 2;
    }
}