:root {
    --bg: #0a0d1a;
    --panel: #141a2e;
    --panel-border: #31406f;
    --text: #e8efff;
    --muted: #a8b6db;
    --accent: #45f0df;
    --accent-2: #ff4fbf;
    --danger: #ff5c7a;
    --shadow: rgba(0, 0, 0, 0.35);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Trebuchet MS", "Segoe UI", sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at 20% 10%, rgba(69, 240, 223, 0.08), transparent 35%),
        radial-gradient(circle at 75% 5%, rgba(255, 79, 191, 0.12), transparent 35%),
        linear-gradient(180deg, #090d18 0%, #0f1426 100%);
    min-height: 100vh;
}

.app {
    max-width: 1220px;
    margin: 0 auto;
    padding: 2.2rem 1.2rem 2.5rem;
}

.hero {
    margin-bottom: 1.4rem;
}

.kicker {
    margin: 0;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.76rem;
}

h1 {
    margin: 0.35rem 0 0.5rem;
    font-size: clamp(1.8rem, 3.4vw, 2.7rem);
}

.subtitle {
    margin: 0;
    color: var(--muted);
    max-width: 72ch;
}

.workspace {
    display: grid;
    gap: 1rem;
    grid-template-columns: 350px minmax(280px, 1fr) 300px;
}

.panel {
    background: linear-gradient(180deg, rgba(18, 25, 46, 0.96), rgba(15, 20, 37, 0.96));
    border: 1px solid var(--panel-border);
    border-radius: 14px;
    padding: 0.9rem;
    box-shadow: 0 16px 32px var(--shadow);
}

.panel-head {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 0.6rem;
    margin-bottom: 0.65rem;
}

.panel-head h2 {
    margin: 0;
    font-size: 1rem;
}

.panel-head p {
    margin: 0;
    color: var(--muted);
    font-size: 0.8rem;
}

#editor,
#preview {
    width: 100%;
    background: #101425;
    border: 1px solid #405188;
    border-radius: 10px;
    image-rendering: pixelated;
}

.hint {
    margin: 0.55rem 0 0;
    color: var(--muted);
    font-size: 0.78rem;
}

.stack + .stack {
    margin-top: 1rem;
}

.stack-label {
    display: block;
    margin-bottom: 0.4rem;
    color: var(--muted);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.palette {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.45rem;
}

.color-swatch {
    border: 2px solid rgba(233, 241, 255, 0.25);
    border-radius: 8px;
    height: 34px;
    cursor: pointer;
    transition: transform 120ms ease, border-color 120ms ease;
}

.color-swatch:hover {
    transform: translateY(-1px);
}

.color-swatch.active {
    border-color: #ffffff;
    box-shadow: 0 0 0 2px rgba(69, 240, 223, 0.45);
}

.button-row {
    display: flex;
    gap: 0.45rem;
    align-items: center;
}

.button-row.wrap {
    flex-wrap: wrap;
}

button {
    border: 1px solid #4c5f9a;
    background: #1f2a4f;
    color: var(--text);
    padding: 0.5rem 0.7rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 700;
    font-size: 0.8rem;
    transition: transform 120ms ease, border-color 120ms ease, background 120ms ease;
}

button:hover {
    transform: translateY(-1px);
    border-color: #7f97df;
}

button.active {
    background: linear-gradient(180deg, #3156ba, #233f8e);
    border-color: #94b0ff;
}

button.ghost {
    background: rgba(35, 53, 97, 0.45);
}

button.primary {
    background: linear-gradient(180deg, #2fbaaa, #23877d);
    border-color: #6be6d9;
    color: #091017;
}

button.danger {
    border-color: rgba(255, 92, 122, 0.65);
    color: #ffd9e1;
}

.range-wrap {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    color: var(--muted);
    font-size: 0.8rem;
}

.range-wrap input[type="range"] {
    width: 110px;
}

.frame-strip {
    margin-top: 0.7rem;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.45rem;
}

.frame-btn {
    border: 1px solid #4a5f9b;
    background: #121a33;
    border-radius: 8px;
    padding: 0.3rem;
    cursor: pointer;
    text-align: center;
    color: var(--muted);
    font-size: 0.7rem;
}

.frame-btn canvas {
    width: 100%;
    height: auto;
    border-radius: 4px;
    image-rendering: pixelated;
    background: #0b1021;
    border: 1px solid rgba(120, 143, 211, 0.45);
}

.frame-btn.active {
    border-color: #93adff;
    box-shadow: 0 0 0 2px rgba(69, 240, 223, 0.28);
    color: var(--text);
}

@media (max-width: 1060px) {
    .workspace {
        grid-template-columns: 1fr 1fr;
    }

    .preview-panel {
        grid-column: span 2;
    }
}

@media (max-width: 720px) {
    .workspace {
        grid-template-columns: 1fr;
    }

    .preview-panel {
        grid-column: span 1;
    }
}