:root {
    --bg: #07111f;
    --panel: rgba(8, 24, 44, 0.78);
    --panel-border: rgba(165, 206, 255, 0.18);
    --text: #ecf6ff;
    --muted: #95aeca;
    --accent: #6cf0c2;
    --accent-strong: #14d391;
    --secondary: #ffb865;
    --danger: #ff7b6b;
    --shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
    --radius-xl: 28px;
    --radius-lg: 20px;
    --radius-md: 14px;
    --board-gradient: radial-gradient(circle at top, rgba(108, 240, 194, 0.18), transparent 38%), linear-gradient(180deg, #07101f 0%, #0a1830 100%);
    --grid-line: rgba(197, 223, 255, 0.08);
    --wall: #d8efff;
}

* {
    box-sizing: border-box;
}

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

body {
    font-family: "Segoe UI Variable", "Avenir Next", "Trebuchet MS", sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at 15% 20%, rgba(255, 184, 101, 0.18), transparent 28%),
        radial-gradient(circle at 85% 12%, rgba(108, 240, 194, 0.2), transparent 26%),
        linear-gradient(160deg, #030914 0%, #091528 48%, #06111f 100%);
    overflow-x: hidden;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 32px 32px;
    mask-image: radial-gradient(circle at center, black 45%, transparent 100%);
}

.app-shell {
    width: min(1200px, calc(100vw - 32px));
    margin: 0 auto;
    padding: 28px 0 40px;
}

.hero {
    display: flex;
    justify-content: space-between;
    gap: 24px;
    align-items: end;
    padding: 28px;
    margin-bottom: 20px;
    border: 1px solid var(--panel-border);
    border-radius: var(--radius-xl);
    background: linear-gradient(135deg, rgba(11, 29, 50, 0.92), rgba(6, 16, 33, 0.8));
    backdrop-filter: blur(12px);
    box-shadow: var(--shadow);
}

.eyebrow {
    margin: 0 0 6px;
    color: var(--accent);
    font-size: 0.86rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.hero h1,
.panel-heading h2 {
    margin: 0;
    font-weight: 800;
    letter-spacing: 0.01em;
}

.hero h1 {
    font-size: clamp(2.4rem, 6vw, 4.8rem);
    line-height: 0.95;
}

.hero-copy,
.panel-heading p,
.tips p {
    color: var(--muted);
    line-height: 1.5;
}

.hero-copy {
    max-width: 640px;
    margin: 14px 0 0;
    font-size: 1rem;
}

.legend div,
.stat-card,
.field,
.tips,
.mobile-controls-panel {
    border: 1px solid var(--panel-border);
}

.layout {
    display: grid;
    grid-template-columns: minmax(280px, 360px) 1fr;
    gap: 20px;
}

.panel {
    background: var(--panel);
    border: 1px solid var(--panel-border);
    border-radius: var(--radius-xl);
    backdrop-filter: blur(12px);
    box-shadow: var(--shadow);
}

.controls-panel,
.board-panel,
.mobile-controls-panel {
    padding: 24px;
}

.panel-heading p {
    margin: 6px 0 0;
}

.field {
    display: grid;
    gap: 10px;
    margin-top: 18px;
    padding: 14px;
    border-radius: var(--radius-lg);
    background: rgba(255, 255, 255, 0.03);
}

.field span,
.stat-card span {
    color: var(--muted);
    font-size: 0.92rem;
}

select,
input[type="range"],
button {
    width: 100%;
}

select,
input[type="range"] {
    accent-color: var(--accent-strong);
}

select {
    padding: 12px 14px;
    border: 0;
    border-radius: 12px;
    color: var(--text);
    background: rgba(2, 9, 18, 0.72);
}

.actions {
    display: grid;
    gap: 12px;
    margin-top: 18px;
}

.sound-toggle-row {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    margin-top: 14px;
    padding: 10px 12px;
    border: 1px solid var(--panel-border);
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.03);
    color: var(--text);
    cursor: pointer;
    user-select: none;
}

#soundEnabledCheckbox {
    width: 18px;
    height: 18px;
    accent-color: var(--accent-strong);
}

#soundEnabledLabel {
    font-size: 0.95rem;
}

button {
    border: 0;
    border-radius: 14px;
    padding: 14px 18px;
    font: inherit;
    font-weight: 700;
    color: var(--text);
    cursor: pointer;
    transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

button:hover,
button:focus-visible {
    transform: translateY(-1px);
}

button:focus-visible {
    outline: 2px solid rgba(108, 240, 194, 0.5);
    outline-offset: 2px;
}

.primary-button {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-strong) 100%);
    color: #022b22;
    box-shadow: 0 16px 36px rgba(20, 211, 145, 0.26);
}

.ghost-button {
    background: rgba(255, 255, 255, 0.06);
}

.tips {
    margin-top: 18px;
    padding: 14px;
    border-radius: var(--radius-lg);
    background: rgba(255, 255, 255, 0.03);
}

.tips p {
    margin: 0;
}

.tips p+p {
    margin-top: 8px;
}

.board-heading {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    align-items: start;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(92px, 1fr));
    gap: 12px;
}

.stat-card {
    min-width: 92px;
    padding: 12px;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.035);
    text-align: center;
}

.stat-card strong {
    display: block;
    margin-top: 6px;
    font-size: 1.15rem;
}

.board-wrap {
    position: relative;
    margin-top: 20px;
    padding: 18px;
    border-radius: 28px;
    background: var(--board-gradient);
    overflow: hidden;
}

.board-wrap::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    border: 1px solid var(--grid-line);
    box-sizing: border-box;
    background-image:
        linear-gradient(var(--grid-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
    background-size: 26px 26px;
    pointer-events: none;
}

#mazeCanvas {
    position: relative;
    z-index: 1;
    display: block;
    width: 100%;
    aspect-ratio: 1 / 1;
    border-radius: 20px;
    border: 2px solid rgba(216, 239, 255, 0.72);
    background: rgba(0, 0, 0, 0.08);
    touch-action: none;
}

.legend {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 16px;
}

.legend div {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.04);
}

.legend-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.legend-dot.start {
    background: var(--accent);
}

.legend-dot.finish {
    background: var(--secondary);
}

.legend-dot.checkpoint {
    background: #7ab7ff;
}

.legend-dot.player {
    background: #ffffff;
}

.mobile-controls-panel {
    margin-top: 20px;
}

.site-footer {
    display: flex;
    flex-wrap: wrap;
    gap: 12px 20px;
    align-items: center;
    justify-content: center;
    margin-top: 20px;
    padding: 14px 18px;
    border: 1px solid var(--panel-border);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.03);
    color: var(--muted);
    font-size: 0.9rem;
}

.site-footer a {
    color: var(--text);
    text-decoration: none;
    border-bottom: 1px solid rgba(236, 246, 255, 0.35);
}

.site-footer a:hover,
.site-footer a:focus-visible {
    color: var(--accent);
    border-bottom-color: rgba(108, 240, 194, 0.5);
}

.toast {
    position: fixed;
    top: 50%;
    left: 50%;
    z-index: 1000;
    max-width: min(420px, calc(100vw - 24px));
    padding: 14px 18px;
    border: 2px solid rgba(108, 240, 194, 0.62);
    border-radius: 16px;
    background: rgba(4, 16, 31, 0.97);
    color: var(--text);
    font-size: 1rem;
    font-weight: 700;
    text-align: center;
    box-shadow: 0 24px 72px rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(8px);
    opacity: 0;
    pointer-events: none;
    transform: translate(-50%, calc(-50% - 10px));
    transition: opacity 200ms ease, transform 200ms ease;
}

.toast.show {
    opacity: 1;
    transform: translate(-50%, -50%);
}

.mobile-controls {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    grid-template-rows: repeat(2, minmax(70px, auto));
    gap: 12px;
    margin-top: 18px;
    grid-template-areas:
        ". up ."
        "left down right";
}

.control-button {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03));
    font-size: 1.5rem;
    touch-action: manipulation;
}

.control-button.up {
    grid-area: up;
}

.control-button.left {
    grid-area: left;
}

.control-button.right {
    grid-area: right;
}

.control-button.down {
    grid-area: down;
}

@media (max-width: 960px) {
    .layout {
        grid-template-columns: 1fr;
    }

    .board-heading {
        flex-direction: column;
    }

    .stats-grid {
        width: 100%;
    }
}

@media (max-width: 720px) {
    .app-shell {
        width: min(100vw - 20px, 1200px);
        padding-top: 18px;
    }

    .hero,
    .controls-panel,
    .board-panel,
    .mobile-controls-panel {
        padding: 18px;
        border-radius: 22px;
    }

    .hero {
        flex-direction: column;
        align-items: start;
    }

    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .board-wrap {
        padding: 12px;
        border-radius: 20px;
    }

    .site-footer {
        border-radius: 18px;
        justify-content: flex-start;
    }

}

@media (prefers-reduced-motion: no-preference) {

    .hero,
    .panel {
        animation: rise 600ms ease both;
    }

    .controls-panel {
        animation-delay: 100ms;
    }

    .board-panel {
        animation-delay: 180ms;
    }

    .mobile-controls-panel {
        animation-delay: 260ms;
    }

    @keyframes rise {
        from {
            opacity: 0;
            transform: translateY(12px);
        }

        to {
            opacity: 1;
            transform: translateY(0);
        }
    }
}