:root {
    --bg: #111;
    --panel: #1a1a1a;
    --border: #333;
    --text: #eee;
    --muted: #aaa;
    color-scheme: dark;
}

* {
    box-sizing: border-box;
}

html, body {
    height: 100%;
    margin: 0;
}

body {
    display: grid;
    grid-template-rows: auto 1fr;
    background: var(--bg);
    color: var(--text);
    font: 14px/1.4 'Web UI Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

/* ================= HEADER ================= */

header {
    position: sticky;
    top: 0;
    z-index: 10;
    background: var(--panel);
    border-bottom: 1px solid var(--border);
}

header .wrap {
    max-width: 100%;
    padding: 10px 14px;
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

h1 {
    font-size: 15px;
    margin: 0;
    font-weight: 600;
}

.right {
    margin-left: auto;
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
}

input[type="file"] {
    display: none;
}

.btn {
    font-family: 'Web UI Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    padding: 6px 10px;
    font-size: 13px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text);
    cursor: pointer;
}

.btn:disabled {
    opacity: 0.5;
    cursor: default;
}

.hint {
    font-size: 12px;
    color: var(--muted);
}

.mono {
    font-family: 'Courier Next', monospace;
}

/* ================= MAIN LAYOUT ================= */

main {
    display: grid;
    grid-template-columns: 280px 1fr;
    height: 100%;
    min-height: 0;
}

/* ================= SIDE PANEL ================= */

.panel {
    border-right: 1px solid var(--border);
    background: var(--panel);
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.panel header {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border);
    background: var(--panel);
}

.panel header h2 {
    margin: 0;
    font-size: 12px;
    text-transform: uppercase;
    color: var(--muted);
}

.panel .content {
    padding: 12px;
    overflow-y: auto;
}

/* ================= SIDE CONTENT ================= */

.dropzone {
    border: 1px dashed var(--border);
    padding: 10px;
    text-align: center;
    margin-bottom: 12px;
    color: var(--muted);
}

.kv {
    display: grid;
    grid-template-columns: 90px 1fr;
    gap: 6px 8px;
    margin-bottom: 12px;
}

.kv .k {
    color: var(--muted);
}

.group {
    margin-bottom: 16px;
}

.group h3 {
    font-size: 12px;
    margin: 12px 0 6px;
    color: var(--muted);
    text-transform: uppercase;
}

.axis-list,
.feature-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.axis,
.feature {
    border: 1px solid var(--border);
    padding: 8px;
}

.axis .row {
    display: flex;
    gap: 8px;
    align-items: center;
}

.axis input[type="range"] {
    font-family: 'Courier Next', monospace;
    width: 100%;
}

.small {
    font-size: 12px;
    color: var(--muted);
}

/* ================= PREVIEW ================= */

.editor-wrap {
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.toolbar {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border);
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    background: var(--panel);
}

.toolbar .field {
    display: flex;
    gap: 4px;
    align-items: center;
}

.toolbar input {
    font-family: 'Courier Next', monospace;
    width: 64px;
}

.pill {
    border: 1px solid var(--border);
    padding: 2px 6px;
    font-size: 12px;
}

.editor {
    flex: 1;
    padding: 16px;
    overflow-y: auto;
    font-size: 48px;
    line-height: 1.2;
    outline: none;
    background: #000;
}

/* ================= FOOTER ================= */

.footer {
    font-feature-settings: "ss09" 1;
    padding: 12px;
    font-size: 12px;
    color: var(--muted);
    border-top: 1px solid var(--border);
}

/* ================= MOBILE ================= */

@media (max-width: 700px) {
    main {
        grid-template-columns: 1fr;
    }

    .panel {
        border-right: none;
        border-bottom: 1px solid var(--border);
        max-height: 40vh;
    }

    .editor {
        font-size: 32px;
    }
}