* {
    box-sizing: border-box;
}

html {
    min-height: 100%;
    background: var(--bg);
    color: var(--text);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body {
    min-height: 100%;
    margin: 0;
    background:
        radial-gradient(circle at top left, rgba(56, 189, 248, 0.16), transparent 35%),
        radial-gradient(circle at bottom right, rgba(34, 197, 94, 0.12), transparent 35%),
        var(--bg);
}

a {
    color: var(--accent);
}

.site-header,
.site-footer {
    display: flex;
    gap: 1rem;
    align-items: center;
    justify-content: space-between;
    padding: 1rem clamp(1rem, 3vw, 2.5rem);
    border-bottom: 1px solid var(--border);
    background: rgba(8, 11, 18, 0.82);
    backdrop-filter: blur(16px);
}

.site-footer {
    border-top: 1px solid var(--border);
    border-bottom: 0;
    flex-wrap: wrap;
    color: var(--muted);
    font-size: 0.92rem;
}

.brand {
    display: flex;
    gap: 0.85rem;
    align-items: center;
}

.brand-mark {
    display: grid;
    place-items: center;
    width: 44px;
    height: 44px;
    border-radius: 14px;
    color: #001018;
    font-weight: 900;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
}

.brand span {
    display: block;
    margin-top: 0.15rem;
    color: var(--muted);
    font-size: 0.9rem;
}

.page {
    width: min(1800px, 100%);
    margin: 0 auto;
    padding: clamp(1rem, 3vw, 2.5rem);
}

.hero {
    display: flex;
    justify-content: space-between;
    gap: 1.5rem;
    align-items: stretch;
    margin-bottom: 1.25rem;
}

.hero h1 {
    margin: 0 0 0.5rem;
    font-size: clamp(2rem, 4vw, 4rem);
    letter-spacing: -0.05em;
}

.hero p {
    max-width: 780px;
    margin: 0;
    color: var(--muted);
    line-height: 1.55;
}

.hero-stats {
    min-width: min(100%, 420px);
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
}

.hero-stats div,
.panel {
    border: 1px solid var(--border);
    border-radius: 22px;
    background: color-mix(in srgb, var(--panel) 86%, transparent);
    box-shadow: 0 22px 60px rgba(0, 0, 0, 0.32);
}

.hero-stats div {
    padding: 1rem;
}

.hero-stats strong {
    display: block;
    font-size: 1.55rem;
    color: var(--accent);
}

.hero-stats span {
    color: var(--muted);
    font-size: 0.86rem;
}

.layout {
    display: grid;
    grid-template-columns: 360px minmax(0, 1fr);
    gap: 1rem;
    align-items: start;
}

.panel {
    padding: 1rem;
}

.controls {
    position: sticky;
    top: 1rem;
}

.controls h2 {
    margin-top: 0;
}

.config-form {
    display: grid;
    gap: 0.8rem;
}

label {
    display: grid;
    gap: 0.35rem;
    color: var(--muted);
    font-size: 0.92rem;
}

input[type="number"] {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0.72rem 0.8rem;
    color: var(--text);
    background: rgba(255, 255, 255, 0.04);
    outline: none;
}

input[type="number"]:focus {
    border-color: var(--accent);
}

.checkbox {
    display: flex;
    align-items: center;
    gap: 0.55rem;
}

.button-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.65rem;
    margin-top: 0.9rem;
}

.btn {
    border: 1px solid var(--border);
    border-radius: 13px;
    padding: 0.76rem 0.85rem;
    color: var(--text);
    background: rgba(255, 255, 255, 0.06);
    cursor: pointer;
    font-weight: 700;
}

.btn:hover,
.btn:focus {
    border-color: var(--accent);
}

.btn.primary {
    color: #001018;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
}

.btn.secondary {
    width: 100%;
}

.btn.danger {
    border-color: color-mix(in srgb, var(--danger) 70%, var(--border));
    color: #fff;
}

.hint {
    margin-bottom: 0;
    color: var(--muted);
    font-size: 0.9rem;
    line-height: 1.45;
}

.board-panel {
    min-height: 620px;
}

.canvas-wrap {
    width: 100%;
    overflow: auto;
    border-radius: 16px;
    background: #020617;
}

canvas {
    display: block;
    image-rendering: crisp-edges;
    max-width: none;
}

.legal {
    max-width: 920px;
    line-height: 1.65;
}

@media (max-width: 980px) {
    .hero,
    .layout {
        grid-template-columns: 1fr;
        display: grid;
    }

    .hero-stats {
        min-width: 0;
    }

    .controls {
        position: static;
    }
}

@media (max-width: 560px) {
    .hero-stats {
        grid-template-columns: 1fr;
    }

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

    .site-header {
        align-items: flex-start;
    }
}