:root {
    --panel-bg: #161616;
    --panel-bg-soft: #1e1e1e;
    --panel-border: #2b2b2a;
    --ink: #efeee8;
    --ink-dim: #8c8c86;
    --accent: #cbff33;
    --accent-2: #ff2e88;
    --danger: #ff5d5d;
    --panel-w: 268px;
    --radius: 14px;
}

* { box-sizing: border-box; }

body {
    font-family: 'Space Grotesk', sans-serif;
    padding: 0;
    margin: 0;
    background: #f7f6f2;
    overflow: hidden;
    -webkit-user-select: none;
       -moz-user-select: none;
         -o-user-select: none;
        -ms-user-select: none;
            user-select: none;
}

canvas {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
    touch-action: none;
}

#message {
    position: fixed;
    left: 20px;
    bottom: 16px;
    z-index: 2;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.5px;
    color: #b9b9b3;
    text-decoration: none;
    opacity: 0.75;
    transition: opacity 0.2s ease, color 0.2s ease;
}
#message:hover {
    opacity: 1;
    color: var(--accent-2);
}

.panel-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 4;
    width: 38px;
    height: 38px;
    border-radius: 10px;
    border: 1px solid var(--panel-border);
    background: var(--panel-bg);
    color: var(--ink);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform 0.25s ease, right 0.3s ease, background 0.2s ease;
}
.panel-toggle:hover { background: var(--panel-bg-soft); }
.panel-toggle svg { transition: transform 0.3s ease; }

body.panel-open .panel-toggle {
    right: calc(var(--panel-w) + 16px);
}
body.panel-open .panel-toggle svg { transform: rotate(180deg); }

.panel {
    position: fixed;
    top: 0;
    right: 0;
    height: 100%;
    width: var(--panel-w);
    background: var(--panel-bg);
    border-left: 1px solid var(--panel-border);
    z-index: 3;
    display: flex;
    flex-direction: column;
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(.4,0,.2,1);
    box-shadow: -18px 0 40px -20px rgba(0,0,0,0.35);
}

body.panel-open .panel { transform: translateX(0); }

.panel-head {
    padding: 22px 20px 14px;
    border-bottom: 1px solid var(--panel-border);
    flex: 0 0 auto;
}

.panel-logo {
    font-family: 'Bungee', 'Space Grotesk', sans-serif;
    font-size: 16px;
    letter-spacing: 1px;
    color: var(--ink);
}
.panel-logo em {
    font-style: normal;
    color: var(--accent);
}

.panel-scroll {
    flex: 1 1 auto;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
    padding: 6px 20px 10px;
}
.panel-scroll::-webkit-scrollbar { width: 6px; }
.panel-scroll::-webkit-scrollbar-thumb { background: var(--panel-border); border-radius: 4px; }

.pgroup {
    padding: 16px 0;
    border-bottom: 1px solid var(--panel-border);
}
.pgroup:last-child { border-bottom: none; }

.pgroup-title {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--ink-dim);
    margin: 0 0 14px;
    font-weight: 600;
}

.row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
}
.row:last-child { margin-bottom: 0; }
.row.col { flex-direction: column; align-items: stretch; }

.lbl-line {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
}

.lbl {
    font-size: 13px;
    color: var(--ink);
    font-weight: 500;
}
.val {
    font-size: 12px;
    color: var(--accent);
    font-variant-numeric: tabular-nums;
}

.hint {
    font-size: 11px;
    color: var(--ink-dim);
    margin: 8px 0 0;
    line-height: 1.4;
}

.swatch-wrap {
    position: relative;
    width: 32px;
    height: 32px;
}
.color-input {
    -webkit-appearance: none;
    appearance: none;
    width: 32px;
    height: 32px;
    border: none;
    border-radius: 50%;
    padding: 0;
    background: none;
    cursor: pointer;
}
.color-input::-webkit-color-swatch-wrapper { padding: 0; border-radius: 50%; }
.color-input::-webkit-color-swatch { border: none; border-radius: 50%; }
.color-input::-moz-color-swatch { border: none; border-radius: 50%; }
.swatch-ring {
    position: absolute;
    inset: -3px;
    border-radius: 50%;
    border: 1px solid var(--panel-border);
    pointer-events: none;
}

.slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    border-radius: 2px;
    background: var(--panel-border);
    outline: none;
    cursor: pointer;
}
.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent);
    border: 3px solid var(--panel-bg);
    box-shadow: 0 0 0 1px var(--accent);
    cursor: pointer;
    margin-top: -6px;
}
.slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent);
    border: 3px solid var(--panel-bg);
    box-shadow: 0 0 0 1px var(--accent);
    cursor: pointer;
}
.slider::-moz-range-track {
    height: 4px;
    border-radius: 2px;
    background: var(--panel-border);
}

.switch-row { align-items: center; }
.switch {
    position: relative;
    width: 38px;
    height: 22px;
    border-radius: 999px;
    background: var(--panel-border);
    border: none;
    cursor: pointer;
    padding: 0;
    flex: 0 0 auto;
    transition: background 0.2s ease;
}
.switch .knob {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--ink);
    transition: transform 0.2s ease, background 0.2s ease;
}
.switch[aria-checked="true"] { background: var(--accent-2); }
.switch[aria-checked="true"] .knob {
    transform: translateX(16px);
    background: #fff;
}
.switch:disabled { opacity: 0.4; cursor: not-allowed; }

#onelineSwitch[aria-checked="true"] { background: var(--accent); }

.btn {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 13px;
    font-weight: 600;
    border-radius: 10px;
    border: 1px solid var(--panel-border);
    padding: 10px 14px;
    cursor: pointer;
    transition: background 0.2s ease, border-color 0.2s ease, transform 0.1s ease;
    width: 100%;
}
.btn:active { transform: scale(0.98); }

.btn-ghost {
    background: transparent;
    color: var(--ink-dim);
}
.btn-ghost:hover {
    color: var(--danger);
    border-color: var(--danger);
}

.btn-primary {
    background: var(--accent);
    color: #111;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}
.btn-primary:hover { filter: brightness(1.06); }

.panel-foot {
    flex: 0 0 auto;
    padding: 16px 20px 20px;
    border-top: 1px solid var(--panel-border);
}

.download-wrap { position: relative; }

.download-menu {
    position: absolute;
    bottom: calc(100% + 10px);
    left: 0;
    right: 0;
    background: var(--panel-bg-soft);
    border: 1px solid var(--panel-border);
    border-radius: 10px;
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
    transform: translateY(6px);
    transition: opacity 0.18s ease, transform 0.18s ease;
}
.download-menu.open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}
.download-menu button {
    display: flex;
    align-items: baseline;
    gap: 8px;
    width: 100%;
    background: none;
    border: none;
    color: var(--ink);
    font-family: 'Space Grotesk', sans-serif;
    font-size: 13px;
    font-weight: 600;
    text-align: left;
    padding: 10px 14px;
    cursor: pointer;
}
.download-menu button + button { border-top: 1px solid var(--panel-border); }
.download-menu button:hover { background: rgba(203,255,51,0.08); color: var(--accent); }
.download-menu button span {
    font-weight: 400;
    font-size: 11px;
    color: var(--ink-dim);
}

/* Tablets */
@media (max-width: 900px) {
    :root { --panel-w: 320px; }
}

/* Phones */
@media (max-width: 480px) {
    :root { --panel-w: 86vw; }

    .panel-head { padding: 18px 16px 12px; }
    .panel-scroll { padding: 4px 16px 10px; }
    .panel-foot { padding: 12px 16px 16px; }

    .pgroup { padding: 14px 0; }

    #message { display: none; }
}

/* Short / landscape phones: keep the panel usable without it eating the whole viewport height */
@media (max-height: 420px) and (orientation: landscape) {
    :root { --panel-w: 280px; }
    .panel-head { padding: 12px 16px 10px; }
    .pgroup { padding: 8px 0; }
    .pgroup-title { margin-bottom: 8px; }
    .row { margin-bottom: 8px; }
}

/* Bigger touch targets on touch/coarse-pointer devices (tablets, phones) */
@media (pointer: coarse) {
    .panel-toggle {
        width: 44px;
        height: 44px;
    }

    .slider {
        height: 6px;
    }
    .slider::-webkit-slider-thumb {
        width: 22px;
        height: 22px;
        margin-top: -8px;
    }
    .slider::-moz-range-thumb {
        width: 22px;
        height: 22px;
    }

    .switch {
        width: 46px;
        height: 27px;
    }
    .switch .knob {
        width: 21px;
        height: 21px;
    }
    .switch[aria-checked="true"] .knob {
        transform: translateX(19px);
    }

    .swatch-wrap {
        width: 40px;
        height: 40px;
    }
    .color-input {
        width: 40px;
        height: 40px;
    }

    .btn {
        padding: 13px 14px;
    }

    .download-menu button {
        padding: 13px 14px;
    }
}

/* Respect notches / safe areas on modern phones */
@supports (padding: max(0px)) {
    .panel-toggle {
        top: max(20px, env(safe-area-inset-top));
        right: max(20px, env(safe-area-inset-right));
    }
    body.panel-open .panel-toggle {
        right: max(calc(var(--panel-w) + 16px), calc(env(safe-area-inset-right) + var(--panel-w) + 16px));
    }
    .panel {
        padding-right: env(safe-area-inset-right);
    }
    .panel-foot {
        padding-bottom: max(16px, env(safe-area-inset-bottom));
    }
    #message {
        left: max(20px, env(safe-area-inset-left));
        bottom: max(16px, env(safe-area-inset-bottom));
    }
}