* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary: #39ff88;
    --primary-dark: #16b85b;
    --secondary: #00eaff;
    --danger: #ff3b6b;
    --gold: #ffd43b;
    --special: #3b9cff;

    --bg: #05080a;
    --bg2: #091014;
    --panel: rgba(10, 20, 25, 0.88);
    --border: rgba(57, 255, 136, 0.35);
    --text: #f1fff7;
    --muted: #8ca99a;
}

body {
    min-height: 100vh;
    background:
        radial-gradient(circle at 50% 20%, rgba(57, 255, 136, 0.08), transparent 35%),
        radial-gradient(circle at 20% 80%, rgba(0, 234, 255, 0.05), transparent 30%),
        var(--bg);
    color: var(--text);
    font-family: "Segoe UI", Arial, sans-serif;
    overflow-x: hidden;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    opacity: 0.06;
    background-image:
        linear-gradient(rgba(255,255,255,0.4) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.4) 1px, transparent 1px);
    background-size: 40px 40px;
}

button {
    font-family: inherit;
}

.app {
    min-height: 100vh;
}

.screen {
    display: none;
    min-height: 100vh;
    width: 100%;
    align-items: center;
    justify-content: center;
    padding: 25px;
}

.screen.active {
    display: flex;
}

/* =========================
   MENU
========================= */

.menu-container {
    width: min(500px, 100%);
    text-align: center;
}

.logo {
    margin-bottom: 45px;
    animation: logoFloat 4s ease-in-out infinite;
}

.snake-icon {
    font-size: 72px;
    margin-bottom: 5px;
    filter:
        drop-shadow(0 0 8px var(--primary))
        drop-shadow(0 0 25px rgba(57,255,136,0.5));
}

.logo h1 {
    font-size: clamp(42px, 8vw, 72px);
    font-weight: 900;
    letter-spacing: 5px;
    line-height: 0.95;
    text-shadow:
        0 0 5px var(--primary),
        0 0 20px var(--primary);
}

.logo h1 span {
    color: var(--secondary);
    text-shadow:
        0 0 5px var(--secondary),
        0 0 20px var(--secondary);
}

.logo p {
    margin-top: 12px;
    color: var(--muted);
    font-size: 12px;
    letter-spacing: 8px;
}

.menu-buttons {
    display: flex;
    flex-direction: column;
    gap: 13px;
}

.arcade-btn {
    width: 100%;
    min-height: 58px;
    padding: 12px 20px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: linear-gradient(
        135deg,
        rgba(255,255,255,0.05),
        rgba(255,255,255,0.015)
    );
    color: var(--text);
    font-size: 15px;
    font-weight: 800;
    letter-spacing: 2px;
    cursor: pointer;
    transition:
        transform 0.15s ease,
        box-shadow 0.15s ease,
        background 0.15s ease,
        border-color 0.15s ease;
}

.arcade-btn:hover {
    transform: translateY(-2px);
    border-color: var(--primary);
    box-shadow:
        0 0 12px rgba(57,255,136,0.25),
        inset 0 0 15px rgba(57,255,136,0.04);
}

.arcade-btn:active {
    transform: translateY(1px);
}

.arcade-btn span {
    margin-right: 10px;
}

.arcade-btn.primary {
    background: linear-gradient(
        135deg,
        rgba(57,255,136,0.18),
        rgba(57,255,136,0.04)
    );
    border-color: var(--primary);
    color: var(--primary);
    box-shadow:
        0 0 15px rgba(57,255,136,0.15),
        inset 0 0 15px rgba(57,255,136,0.03);
}

.arcade-btn.primary:hover {
    background: rgba(57,255,136,0.2);
    box-shadow:
        0 0 25px rgba(57,255,136,0.35),
        inset 0 0 20px rgba(57,255,136,0.08);
}

.menu-footer {
    margin-top: 30px;
    display: flex;
    justify-content: center;
    gap: 12px;
    color: var(--muted);
    font-size: 11px;
    letter-spacing: 1px;
}

@keyframes logoFloat {
    0%, 100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-5px);
    }
}

/* =========================
   GAME
========================= */

.game-wrapper {
    width: min(100%, 900px);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hud {
    width: min(800px, 100%);
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
    margin-bottom: 10px;
}

.hud-item {
    min-height: 62px;
    padding: 8px 10px;
    border: 1px solid var(--border);
    background: rgba(8, 18, 22, 0.8);
    border-radius: 6px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    box-shadow: inset 0 0 15px rgba(57,255,136,0.025);
}

.hud-label {
    font-size: 9px;
    letter-spacing: 1.5px;
    color: var(--muted);
}

.hud-item span:last-child {
    color: var(--primary);
    font-size: 19px;
    font-weight: 900;
    margin-top: 2px;
    text-shadow: 0 0 8px rgba(57,255,136,0.5);
}

.game-container {
    position: relative;
    width: 100%;
    border: 1px solid var(--primary);
    border-radius: 8px;
    overflow: hidden;
    background: #020506;
    box-shadow:
        0 0 20px rgba(57,255,136,0.15),
        inset 0 0 30px rgba(0,0,0,0.8);
}

#gameCanvas {
    display: block;
    width: 100%;
    height: auto;
    aspect-ratio: 4 / 3;
    background: #030708;
}

.game-controls {
    width: 100%;
    margin-top: 10px;
    display: flex;
    justify-content: space-between;
    color: var(--muted);
    font-size: 10px;
    letter-spacing: 1px;
}

/* =========================
   OVERLAYS
========================= */

.game-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(4px);
    z-index: 10;
}

.game-overlay.hidden {
    display: none;
}

.overlay-box {
    width: min(390px, 90%);
    padding: 28px;
    border: 1px solid var(--primary);
    border-radius: 10px;
    background:
        linear-gradient(
            145deg,
            rgba(9, 25, 25, 0.97),
            rgba(4, 10, 13, 0.97)
        );
    text-align: center;
    box-shadow:
        0 0 30px rgba(57,255,136,0.2),
        inset 0 0 30px rgba(57,255,136,0.025);
    animation: overlayIn 0.25s ease-out;
}

.overlay-icon {
    width: 58px;
    height: 58px;
    margin: 0 auto 15px;
    border: 2px solid var(--primary);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--primary);
    font-size: 24px;
    box-shadow: 0 0 20px rgba(57,255,136,0.25);
}

.overlay-icon.danger {
    color: var(--danger);
    border-color: var(--danger);
    box-shadow: 0 0 20px rgba(255,59,107,0.25);
}

.overlay-box h2 {
    font-size: 34px;
    letter-spacing: 4px;
    margin-bottom: 8px;
}

.overlay-box p {
    color: var(--muted);
    margin-bottom: 20px;
}

.overlay-box .arcade-btn {
    margin-top: 9px;
}

@keyframes overlayIn {
    from {
        opacity: 0;
        transform: scale(0.94);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.new-record {
    color: var(--gold);
    font-weight: 900;
    letter-spacing: 2px;
    margin-bottom: 14px;
    text-shadow: 0 0 12px rgba(255,212,59,0.6);
    animation: recordPulse 0.8s ease-in-out infinite alternate;
}

.new-record.hidden {
    display: none;
}

@keyframes recordPulse {
    from {
        transform: scale(1);
    }

    to {
        transform: scale(1.05);
    }
}

.results {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin: 20px 0;
}

.results div {
    padding: 12px 5px;
    background: rgba(255,255,255,0.035);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: 5px;
}

.results span {
    display: block;
    font-size: 8px;
    color: var(--muted);
    letter-spacing: 1px;
}

.results strong {
    display: block;
    color: var(--primary);
    font-size: 20px;
    margin-top: 3px;
}

/* =========================
   PANELS
========================= */

.panel {
    position: relative;
    width: min(850px, 100%);
    max-height: calc(100vh - 50px);
    overflow-y: auto;
    padding: 40px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--panel);
    box-shadow:
        0 0 30px rgba(57,255,136,0.1),
        inset 0 0 30px rgba(57,255,136,0.02);
}

.panel h2 {
    text-align: center;
    color: var(--primary);
    font-size: 32px;
    letter-spacing: 4px;
    margin-bottom: 30px;
    text-shadow: 0 0 10px rgba(57,255,136,0.4);
}

.close-btn {
    position: absolute;
    right: 18px;
    top: 12px;
    border: none;
    background: transparent;
    color: var(--muted);
    font-size: 32px;
    cursor: pointer;
}

.close-btn:hover {
    color: var(--danger);
}

.instruction-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.info-card {
    padding: 20px;
    min-height: 170px;
    border: 1px solid rgba(57,255,136,0.16);
    border-radius: 8px;
    background: rgba(255,255,255,0.025);
}

.info-icon {
    font-size: 32px;
    margin-bottom: 10px;
}

.info-card h3 {
    color: var(--secondary);
    font-size: 14px;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.info-card p {
    color: var(--muted);
    font-size: 13px;
    line-height: 1.5;
}

.info-card strong {
    color: var(--text);
}

.bottom-btn {
    margin-top: 25px;
}

/* =========================
   RECORDS
========================= */

.records-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.record-card {
    min-height: 100px;
    padding: 18px 25px;
    display: flex;
    align-items: center;
    gap: 20px;
    border: 1px solid rgba(57,255,136,0.2);
    border-radius: 8px;
    background: rgba(255,255,255,0.025);
}

.record-icon {
    font-size: 38px;
}

.record-card div {
    display: flex;
    flex-direction: column;
}

.record-card span:not(.record-icon) {
    color: var(--muted);
    font-size: 10px;
    letter-spacing: 2px;
}

.record-card strong {
    color: var(--primary);
    font-size: 32px;
    text-shadow: 0 0 10px rgba(57,255,136,0.4);
}

.danger-btn {
    margin-top: 25px;
    border-color: rgba(255,59,107,0.4);
    color: var(--danger);
}

.danger-btn:hover {
    border-color: var(--danger);
    box-shadow: 0 0 15px rgba(255,59,107,0.2);
}

/* =========================
   SETTINGS
========================= */

.settings-panel {
    max-width: 750px;
}

.setting {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 25px;
    padding: 22px 0;
    border-bottom: 1px solid rgba(255,255,255,0.07);
}

.setting h3 {
    font-size: 15px;
    letter-spacing: 1px;
    margin-bottom: 5px;
}

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

.toggle-btn {
    min-width: 90px;
    height: 42px;
    border: 1px solid var(--primary);
    border-radius: 5px;
    background: rgba(57,255,136,0.1);
    color: var(--primary);
    font-weight: 900;
    cursor: pointer;
}

.toggle-btn.off {
    border-color: var(--danger);
    background: rgba(255,59,107,0.08);
    color: var(--danger);
}

.option-group {
    display: flex;
    gap: 5px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.option-btn,
.theme-btn {
    padding: 9px 11px;
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 5px;
    background: rgba(255,255,255,0.035);
    color: var(--muted);
    font-size: 9px;
    font-weight: 800;
    cursor: pointer;
}

.option-btn.selected,
.theme-btn.selected {
    color: var(--primary);
    border-color: var(--primary);
    background: rgba(57,255,136,0.1);
}

.theme-btn.green.selected {
    --theme-color: #39ff88;
}

.theme-btn.neon.selected {
    color: #ff42e7;
    border-color: #ff42e7;
    background: rgba(255,66,231,0.1);
}

.theme-btn.blue.selected {
    color: #3b9cff;
    border-color: #3b9cff;
    background: rgba(59,156,255,0.1);
}

.theme-btn.red.selected {
    color: #ff3b6b;
    border-color: #ff3b6b;
    background: rgba(255,59,107,0.1);
}

/* =========================
   RESPONSIVE
========================= */

@media (max-width: 700px) {
    .screen {
        padding: 15px;
    }

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

    .hud-item:nth-child(4),
    .hud-item:nth-child(5) {
        grid-column: span 1;
    }

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

    .panel {
        padding: 28px 20px;
    }

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

    .option-group {
        justify-content: flex-start;
    }

    .game-controls {
        font-size: 8px;
    }
}

@media (max-width: 450px) {
    .logo h1 {
        font-size: 40px;
    }

    .snake-icon {
        font-size: 55px;
    }

    .hud-item {
        min-height: 55px;
    }

    .hud-item span:last-child {
        font-size: 16px;
    }

    .hud-label {
        font-size: 8px;
    }

    .menu-footer {
        flex-direction: column;
        gap: 5px;
    }

    .game-controls {
        flex-direction: column;
        gap: 5px;
        text-align: center;
    }
}

@media (max-height: 760px) {
    .screen {
        min-height: 100svh;
        padding: clamp(8px, 2vh, 16px);
    }

    #menuScreen .menu-container {
        width: min(500px, 100%);
    }

    #menuScreen .logo {
        margin-bottom: clamp(12px, 2.5vh, 22px);
    }

    #menuScreen .snake-icon {
        font-size: clamp(38px, 8vh, 60px);
    }

    #menuScreen .logo h1 {
        font-size: clamp(34px, 7vh, 54px);
    }

    #menuScreen .logo p {
        margin-top: 8px;
        letter-spacing: clamp(4px, 1vh, 7px);
    }

    #menuScreen .menu-buttons {
        gap: clamp(7px, 1.5vh, 11px);
    }

    #menuScreen .arcade-btn {
        min-height: clamp(42px, 7vh, 54px);
        padding: 8px 14px;
        font-size: clamp(12px, 2.4vh, 15px);
    }

    #menuScreen .menu-footer {
        margin-top: clamp(10px, 2vh, 18px);
        font-size: 9px;
    }

    .game-wrapper {
        width: min(100%, 100svh, 900px);
    }
}