:root{
    --bg:#0d1117;
    --panel:#161b22;
    --text:#c9d1d9;
    --muted:#8b949e;
    --border:rgba(240,246,252,0.14);
    --accent:#7dd3fc;
    --header-h:64px;
}

*{
    box-sizing:border-box;
}

body{
    margin:0;
    min-height:100vh;
    font-family:system-ui, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
    background:var(--bg);
    color:var(--text);
}

body.is-ramp-dragging{
    cursor:ew-resize;
    -webkit-user-select:none;
    user-select:none;
}

body.is-ramp-dragging *{
    cursor:ew-resize;
}

.topbar{
    position:fixed;
    top:0;
    left:0;
    width:100%;
    z-index:10;
    height:var(--header-h);
    display:flex;
    align-items:center;
    justify-content:space-between;
    padding:0 20px;
    background:rgba(22,27,34,0.74);
    backdrop-filter:blur(10px);
    -webkit-backdrop-filter:blur(10px);
    border-bottom:1px solid rgba(240,246,252,0.08);
}

.logo{
    display:block;
    height:34px;
}

.logo img{
    display:block;
    width:auto;
    height:100%;
}

.nav{
    display:flex;
    align-items:center;
    gap:10px;
}

.nav a{
    color:var(--text);
    text-decoration:none;
    padding:8px 10px;
    border-radius:8px;
    font-size:14px;
}

.nav-toggle{
    display:none;
    border:1px solid var(--border);
    border-radius:8px;
    background:rgba(13,17,23,0.7);
    width:42px;
    height:36px;
    padding:0;
    align-items:center;
    justify-content:center;
    cursor:pointer;
}

.nav-toggle img{
    display:block;
    width:22px;
    height:22px;
}

.nav-toggle:focus-visible{
    outline:2px solid var(--text);
    outline-offset:2px;
}

.nav-dropdown{
    position:relative;
}

.nav-dropdown::after{
    content:"";
    position:fixed;
    top:44px;
    right:0;
    display:none;
    width:180px;
    height:20px;
}

.nav-dropdown-trigger{
    border:0;
    background:transparent;
    color:var(--text);
    text-decoration:none;
    padding:8px 10px;
    border-radius:8px;
    font-family:inherit;
    font-size:14px;
    cursor:pointer;
    display:flex;
    align-items:center;
    gap:5px;
}

.nav-dropdown-menu{
    position:fixed;
    top:var(--header-h);
    right:0;
    min-width:180px;
    padding:6px;
    border:1px solid var(--border);
    border-radius:0;
    background:rgba(13,17,23,0.96);
    box-shadow:0 10px 24px rgba(0,0,0,0.24);
    opacity:0;
    transform:translateY(-4px);
    visibility:hidden;
    pointer-events:none;
    transition:opacity 160ms ease, transform 160ms ease;
    z-index:2;
}

.nav-dropdown-menu a{
    display:block;
}

.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown.is-open .nav-dropdown-menu,
.nav-dropdown:focus-within .nav-dropdown-menu{
    opacity:1;
    transform:translateY(0);
    visibility:visible;
    pointer-events:auto;
}

.nav-dropdown:hover::after,
.nav-dropdown.is-open::after,
.nav-dropdown:focus-within::after{
    display:block;
}

.nav a:hover,
.nav-dropdown-trigger:hover,
.nav-dropdown-trigger[aria-expanded="true"]{
    background:rgba(240,246,252,0.08);
}

.tool-shell{
    min-height:100vh;
    display:grid;
    place-items:center;
    padding:calc(var(--header-h) + 32px) 20px 40px;
}

.tool-panel{
    width:min(1040px, 100%);
    border:1px solid var(--border);
    border-radius:8px;
    background:rgba(22,27,34,0.88);
    padding:24px;
}

.tool-heading{
    margin-bottom:18px;
}

.eyebrow{
    margin:0 0 6px;
    color:var(--accent);
    font-size:13px;
    font-weight:700;
    text-transform:uppercase;
}

h1{
    margin:0;
    font-size:2rem;
    line-height:1.1;
}

.homogeneous-controls{
    display:flex;
    flex-wrap:wrap;
    align-items:center;
    gap:14px;
    margin-bottom:18px;
    padding:14px;
    border:1px solid var(--border);
    border-radius:8px;
    background:rgba(13,17,23,0.38);
}

.roughness-invert-toggle,
.homogeneous-select-label,
.homogeneous-value{
    display:flex;
    align-items:center;
    gap:8px;
    color:var(--text);
    font-size:14px;
}

.roughness-invert-toggle{
    font-weight:700;
}

.roughness-invert-toggle input{
    width:16px;
    height:16px;
    accent-color:var(--accent);
}

.homogeneous-select-label select{
    min-width:118px;
    border:1px solid var(--border);
    border-radius:8px;
    padding:8px 10px;
    color:var(--text);
    background:#0d1117;
    font:inherit;
}

.homogeneous-value{
    flex:1 1 240px;
}

.slider-row{
    display:flex;
    align-items:center;
    gap:10px;
    flex:1;
    min-width:190px;
}

.slider-row input{
    width:100%;
    accent-color:var(--accent);
}

.slider-row output{
    min-width:3ch;
    color:var(--accent);
    font-weight:700;
    text-align:right;
}

.is-hidden{
    display:none;
}

.map-grid{
    display:grid;
    grid-template-columns:repeat(2, minmax(0, 1fr));
    gap:14px;
    margin-bottom:18px;
}

.map-slot{
    display:grid;
    gap:12px;
    min-width:0;
}

.map-slot h2{
    margin:0 0 10px;
    font-size:1.1rem;
}

.drop-zone{
    position:relative;
    display:grid;
    min-height:220px;
    align-content:center;
    justify-items:center;
    gap:16px;
    padding:24px 18px;
    border:2px dashed var(--border);
    border-radius:8px;
    background:rgba(13,17,23,0.5);
    text-align:center;
}

.drop-zone.is-dragging{
    border-color:var(--accent);
    background:rgba(125,211,252,0.08);
}

.drop-zone.has-file{
    border-style:solid;
    border-color:rgba(125,211,252,0.42);
}

.drop-zone.is-generated{
    border-style:solid;
    border-color:rgba(125,211,252,0.3);
    background:rgba(125,211,252,0.06);
}

.drop-zone.is-generated .choose-button{
    opacity:0.45;
    cursor:not-allowed;
}

.map-preview,
.output-preview{
    position:relative;
    display:grid;
    gap:8px;
    min-height:190px;
    align-items:center;
    justify-items:center;
    padding:12px;
    border:1px solid var(--border);
    border-radius:8px;
    background:rgba(13,17,23,0.38);
    overflow:hidden;
}

.map-preview canvas,
.output-preview canvas{
    display:block;
    max-width:100%;
    width:auto;
    height:auto;
    max-height:260px;
    border-radius:6px;
    background-color:#111827;
    background-image:
        linear-gradient(45deg, rgba(255,255,255,0.08) 25%, transparent 25%),
        linear-gradient(-45deg, rgba(255,255,255,0.08) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, rgba(255,255,255,0.08) 75%),
        linear-gradient(-45deg, transparent 75%, rgba(255,255,255,0.08) 75%);
    background-position:0 0, 0 8px, 8px -8px, -8px 0;
    background-size:16px 16px;
    image-rendering:auto;
}

.map-preview.is-empty canvas,
.output-preview.is-empty canvas{
    display:none;
}

.map-preview span,
.output-preview span{
    color:var(--muted);
    font-size:13px;
    text-align:center;
}

.map-preview:not(.is-empty) span,
.output-preview:not(.is-empty) span{
    display:none;
}

.output-preview{
    margin-bottom:12px;
}

.output-preview h2{
    justify-self:start;
    margin:0;
    font-size:1.05rem;
}

.ramp-editor{
    display:grid;
    gap:12px;
    padding:14px;
    border:1px solid var(--border);
    border-radius:8px;
    background:rgba(13,17,23,0.38);
    -webkit-user-select:none;
    user-select:none;
}

.ramp-heading{
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:10px;
}

.ramp-heading h3{
    margin:0;
    font-size:1rem;
}

.ramp-reset{
    border:1px solid var(--border);
    border-radius:8px;
    padding:6px 10px;
    color:var(--text);
    background:rgba(240,246,252,0.06);
    font:inherit;
    font-size:13px;
    cursor:pointer;
}

.ramp-track{
    position:relative;
    height:30px;
    border:1px solid rgba(240,246,252,0.22);
    border-radius:8px;
    background:#000;
    cursor:crosshair;
    -webkit-user-select:none;
    user-select:none;
    touch-action:none;
}

.ramp-handle{
    position:absolute;
    top:50%;
    width:18px;
    height:38px;
    padding:0;
    border:2px solid #fff;
    border-radius:7px;
    background:#000;
    box-shadow:0 3px 10px rgba(0,0,0,0.35);
    transform:translate(-50%, -50%);
    cursor:ew-resize;
    -webkit-user-select:none;
    user-select:none;
    touch-action:none;
}

.ramp-handle:focus-visible,
.ramp-reset:focus-visible{
    outline:2px solid var(--accent);
    outline-offset:2px;
}

.ramp-stop-grid{
    display:grid;
    grid-template-columns:repeat(2, minmax(0, 1fr));
    gap:10px;
}

.ramp-stop{
    display:grid;
    gap:8px;
    min-width:0;
    margin:0;
    padding:10px;
    border:1px solid var(--border);
    border-radius:8px;
}

.ramp-stop legend{
    padding:0 4px;
    color:var(--accent);
    font-size:12px;
    font-weight:700;
    text-transform:uppercase;
}

.ramp-stop label{
    display:grid;
    gap:6px;
    color:var(--muted);
    font-size:13px;
}

.ramp-stop input[type="number"]{
    width:100%;
    min-width:0;
    border:1px solid var(--border);
    border-radius:8px;
    padding:7px 8px;
    color:var(--text);
    background:#0d1117;
    font:inherit;
}

.ramp-stop input[type="range"]{
    width:100%;
    accent-color:var(--accent);
}

.file-input{
    position:absolute;
    width:1px;
    height:1px;
    opacity:0;
    pointer-events:none;
}

.drop-copy{
    display:grid;
    gap:6px;
    max-width:100%;
}

.drop-copy p,
.status{
    margin:0;
}

.drop-copy p{
    overflow-wrap:anywhere;
    font-weight:700;
}

.drop-copy span,
.status{
    color:var(--muted);
}

.choose-button,
.primary-button,
.clear-button,
.download-button{
    border:1px solid var(--border);
    border-radius:8px;
    padding:10px 14px;
    color:var(--text);
    background:rgba(240,246,252,0.08);
    font:inherit;
    text-decoration:none;
    cursor:pointer;
}

.primary-button{
    background:var(--accent);
    color:#061018;
    border-color:transparent;
    font-weight:700;
}

.primary-button:disabled,
.choose-button:disabled,
.download-button.is-disabled{
    opacity:0.45;
    cursor:not-allowed;
    pointer-events:none;
}

.actions{
    display:flex;
    flex-wrap:wrap;
    gap:10px;
    margin-bottom:12px;
}

@media (max-width:720px){
    .homogeneous-controls{
        align-items:stretch;
        flex-direction:column;
    }

    .homogeneous-select-label,
    .homogeneous-value{
        align-items:flex-start;
        flex-direction:column;
    }

    .homogeneous-select-label select,
    .slider-row{
        width:100%;
    }

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

    .ramp-stop-grid{
        grid-template-columns:1fr;
    }
}

@media (max-width:800px){
    .topbar{
        padding:0 12px;
    }

    .logo{
        height:30px;
    }

    .nav-toggle{
        display:flex;
    }

    .nav{
        position:absolute;
        top:calc(100% + 8px);
        right:12px;
        min-width:170px;
        flex-direction:column;
        gap:4px;
        padding:8px;
        border:1px solid var(--border);
        border-radius:10px;
        background:rgba(13,17,23,0.96);
        opacity:0;
        transform:translateY(-6px);
        visibility:hidden;
        pointer-events:none;
        transition:opacity 180ms ease, transform 180ms ease;
    }

    .topbar.is-nav-open .nav{
        opacity:1;
        transform:translateY(0);
        visibility:visible;
        pointer-events:auto;
    }

    .nav a{
        display:block;
    }

    .nav-dropdown{
        width:100%;
    }

    .nav-dropdown::after,
    .nav-dropdown:hover::after,
    .nav-dropdown.is-open::after,
    .nav-dropdown:focus-within::after{
        display:none;
    }

    .nav-dropdown-trigger{
        width:100%;
        justify-content:center;
        align-items:center;
    }

    .nav-dropdown.is-open .nav-dropdown-trigger{
        justify-content:flex-start;
    }

    .nav-dropdown-menu{
        position:static;
        display:none;
        min-width:0;
        margin:4px 0 0;
        padding:4px 0 0 10px;
        border:0;
        border-radius:0;
        background:transparent;
        box-shadow:none;
        opacity:1;
        transform:none;
        visibility:visible;
        pointer-events:auto;
        transition:none;
    }

    .nav-dropdown.is-open .nav-dropdown-menu{
        display:block;
    }

    .tool-panel{
        padding:18px;
    }

    h1{
        font-size:1.65rem;
    }
}