@font-face {
    font-family: "Joystix";
    src:
        local("Joystix"),
        url("fonts/joystix-monospace.otf") format("opentype");
}

html,
body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    background: #010d18;
    font-family: "Joystix";
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    color: rgb(255, 184, 28);
}

.button-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 14px;
}

.status-label {
    margin: 0 0 18px;
    color: #57d6ce;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.28rem;
}

.panel-divider {
    width: 70%;
    height: 1px;
    margin: 27px auto;
    background: linear-gradient(to right,
            transparent,
            rgba(86, 211, 211, 0.8),
            transparent);
}

.game-button {
    min-width: 155px;
    padding: 13px 22px;
    box-sizing: border-box;
    border: 1px solid #46b9bd;
    border-radius: 7px;
    color: #dbfffa;
    background: rgba(8, 52, 65, 0.85);
    font: inherit;
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 0.05rem;
    text-decoration: none;
    text-transform: uppercase;
    cursor: pointer;
    transition:
        transform 160ms ease,
        background-color 160ms ease,
        border-color 160ms ease,
        box-shadow 160ms ease;
}

.game-button:hover {
    transform: translateY(-2px);
    border-color: #8af1e7;
    background: rgba(15, 91, 99, 0.95);
    box-shadow: 0 0 18px rgba(74, 217, 208, 0.3);
}

.game-button:active {
    transform: translateY(0);
}

.game-button:disabled {
    opacity: 0.55;
    cursor: default;
    transform: none;
}

.sonar-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 220px;
    height: 220px;
    border: 2px solid rgba(63, 198, 201, 0.22);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    animation: sonarPulse 4.5s ease-out infinite;
}

.sonar-ring-two {
    animation-delay: 1.5s;
}

.sonar-ring-three {
    animation-delay: 3s;
}

@keyframes sonarPulse {
    0% {
        width: 180px;
        height: 180px;
        opacity: 0;
    }

    20% {
        opacity: 0.7;
    }

    100% {
        width: 900px;
        height: 900px;
        opacity: 0;
    }
}

@media (max-width: 560px) {
    .button-container {
        flex-direction: column;
    }

    .game-button {
        width: 100%;
    }
}

/* In-page game states */
[hidden] {
    display: none !important;
}

#mobile-screen {
    display: none;
}

.mobile-device body > :not(#mobile-screen) {
    display: none !important;
}

.mobile-device #mobile-screen {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: auto;
    padding: 24px;
    box-sizing: border-box;
    background: radial-gradient(circle at 50% 30%, rgba(18, 104, 119, 0.35), transparent 38%), #010d18;
}

.mobile-panel {
    padding: 32px 24px;
}

.mobile-hint {
    margin: 24px 0 0;
    color: #57d6ce;
    font-size: 0.75rem;
    line-height: 1.7;
}

#game,
#game canvas {
    position: fixed;
    inset: 0;
}

.state-screen {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: auto;
    padding: 24px;
    box-sizing: border-box;
    background: radial-gradient(circle at 50% 30%, rgba(18, 104, 119, 0.35), transparent 38%), rgba(1, 13, 24, 0.84);
}

.dialog-screen {
    background: radial-gradient(circle at 50% 35%, rgba(18, 104, 119, 0.18), transparent 42%), rgba(1, 13, 24, 0.48);
    backdrop-filter: blur(2px);
}

.state-panel {
    position: relative;
    z-index: 2;
    width: min(620px, 100%);
    padding: 38px;
    box-sizing: border-box;
    text-align: center;
    color: #d8fbf6;
    background: linear-gradient(145deg, rgba(7, 40, 53, 0.98), rgba(2, 21, 33, 0.98));
    border: 2px solid #3aa6ad;
    border-radius: 18px;
    box-shadow: 0 22px 60px rgba(0, 0, 0, 0.65), inset 0 0 35px rgba(29, 180, 178, 0.08);
}

.state-panel h1 {
    margin: 0 0 14px;
    color: #e3fffa;
    font-size: clamp(1.9rem, 5vw, 3.2rem);
}

/* Keep the landing card comfortably inside a laptop-sized viewport. */
.start-panel {
    max-height: calc(100vh - 48px);
    max-height: calc(100dvh - 48px);
    overflow-y: auto;
    padding: 32px 38px;
}

.start-panel h1 {
    margin-bottom: 8px;
    font-size: clamp(1.8rem, 4vw, 2.6rem);
}

.start-panel .screen-copy {
    margin: 8px 0;
}

.start-panel .start-form {
    gap: 11px;
    margin-top: 20px;
}

.start-panel .start-form input[type="text"] {
    padding: 12px;
}

.start-panel .difficulty-group {
    gap: 9px;
    margin-top: 8px;
}

.start-panel .difficulty-options {
    padding: 0;
}

.start-panel .game-button {
    padding-block: 12px;
    margin-top: 12px;
}

.start-panel .panel-divider {
    margin-block: 21px;
}

.start-panel .scores-title {
    margin-bottom: 9px;
}

.start-panel .high-score-list li {
    padding-block: 6px;
}

.screen-copy {
    color: #9ccfd2;
    line-height: 1.6;
}

.thanks-message {
    margin: 0;
    color: #68d6db;
    font-size: clamp(1rem, 2.5vw, 1.4rem);
}

.game-over-panel .screen-copy {
    margin-top: 22px;
}

.portfolio-link {
    display: inline-block;
    margin-top: 24px;
    color: #78afb3;
    font-size: 0.65rem;
    line-height: 1.5;
    text-underline-offset: 4px;
    transition: color 160ms ease;
}

.portfolio-link:hover {
    color: #bce4e3;
}

.start-form {
    display: grid;
    gap: 14px;
    margin: 26px auto 0;
    max-width: 450px;
    text-align: left;
}

.start-form>label,
.form-label {
    display: block;
    color: #68d6db;
    font-size: 0.75rem;
    letter-spacing: 0.08rem;
}

.start-form input[type="text"] {
    width: 100%;
    padding: 13px;
    box-sizing: border-box;
    color: #e3fffa;
    background: #041c29;
    border: 1px solid #3aa6ad;
    border-radius: 6px;
    font: inherit;
    text-transform: uppercase;
}

.difficulty-group {
    display: grid;
    gap: 10px;
}

.difficulty-options {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.difficulty-option {
    position: relative;
    cursor: pointer;
}

.difficulty-option input {
    position: absolute;
    width: 1px;
    height: 1px;
    opacity: 0;
}

.difficulty-card-content {
    display: grid;
    align-content: center;
    gap: 8px;
    min-height: 76px;
    padding: 10px 8px;
    box-sizing: border-box;
    text-align: center;
    color: #9ccfd2;
    background: rgba(4, 28, 41, 0.85);
    border: 1px solid rgba(58, 166, 173, 0.45);
    border-radius: 7px;
    transition:
        transform 160ms ease,
        color 160ms ease,
        background-color 160ms ease,
        border-color 160ms ease,
        box-shadow 160ms ease;
}

.difficulty-card-content strong {
    color: #d8fbf6;
    font-size: 0.68rem;
    text-transform: uppercase;
}

.difficulty-card-content small {
    font-size: 0.48rem;
    line-height: 1.55;
}

.difficulty-option:hover .difficulty-card-content {
    transform: translateY(-2px);
    border-color: #68d6db;
}

.difficulty-option input:checked + .difficulty-card-content {
    color: #c8f3ef;
    background: rgba(15, 91, 99, 0.72);
    border-color: #73e2d6;
    box-shadow: 0 0 16px rgba(99, 215, 207, 0.2), inset 0 0 18px rgba(99, 215, 207, 0.08);
}

.difficulty-option input:checked + .difficulty-card-content strong {
    color: #ffbf3d;
}

.difficulty-option input:focus-visible + .difficulty-card-content {
    outline: 2px solid #e3fffa;
    outline-offset: 3px;
}

.primary-button {
    color: #04171e;
    border-color: #73e2d6;
    background: #63d7cf;
}

.danger-button {
    border-color: #e86f71;
    background: rgba(116, 30, 38, 0.85);
}

.scores-title {
    margin: 0 0 12px;
    color: #68d6db;
    font-size: 0.9rem;
    text-transform: uppercase;
}

.high-score-list {
    max-width: 450px;
    min-height: 28px;
    margin: 0 auto;
    padding: 0;
    list-style: none;
}

.high-score-list li {
    display: flex;
    justify-content: space-between;
    gap: 18px;
    padding: 8px 4px;
    color: #a9d5d5;
    border-bottom: 1px solid rgba(70, 185, 189, 0.18);
    font-size: 0.7rem;
}

.high-score-list li strong {
    color: #ffbf3d;
}

.score-medal {
    display: inline-block;
    font-family: sans-serif;
    font-size: 1rem;
    line-height: 0.7;
    vertical-align: middle;
    filter: drop-shadow(0 0 4px rgba(255, 224, 145, 0.3));
}

.high-score-list .latest-high-score {
    margin: 3px -8px;
    padding: 9px 12px;
    color: #e3fffa;
    background: linear-gradient(90deg, rgba(99, 215, 207, 0.2), rgba(255, 191, 61, 0.12));
    border: 1px solid rgba(99, 215, 207, 0.65);
    border-radius: 6px;
    box-shadow: 0 0 16px rgba(99, 215, 207, 0.16);
    animation: latest-score-pulse 1.1s ease-out both;
}

@keyframes latest-score-pulse {
    0% {
        transform: scale(0.96);
        box-shadow: 0 0 28px rgba(255, 191, 61, 0.5);
    }

    100% {
        transform: scale(1);
        box-shadow: 0 0 16px rgba(99, 215, 207, 0.16);
    }
}

.confetti-celebration {
    position: fixed;
    inset: 0;
    z-index: 2000;
    overflow: hidden;
    pointer-events: none;
}

.confetti-celebration i {
    position: absolute;
    top: -18px;
    left: var(--x);
    width: 9px;
    height: 14px;
    background: var(--colour);
    border-radius: 2px;
    box-shadow: 0 0 7px color-mix(in srgb, var(--colour), transparent 30%);
    animation: confetti-fall var(--duration) cubic-bezier(0.18, 0.65, 0.45, 1) var(--delay) both;
}

@keyframes confetti-fall {
    from {
        transform: translate3d(0, -5vh, 0) rotate(0deg);
        opacity: 1;
    }

    to {
        transform: translate3d(var(--drift), 105vh, 0) rotate(var(--spin));
        opacity: 0.15;
    }
}

.high-score-list .loading-score {
    color: #68d6db;
    animation: score-loading-pulse 900ms ease-in-out infinite alternate;
}

@keyframes score-loading-pulse {
    from {
        opacity: 0.45;
    }

    to {
        opacity: 1;
    }
}

@media (prefers-reduced-motion: reduce) {
    .latest-high-score {
        animation: none;
    }

    .confetti-celebration {
        display: none;
    }

    .high-score-list .loading-score {
        animation: none;
    }
}

.high-score-list .empty-score {
    display: block;
    text-align: center;
}

.result-score {
    margin: 18px 0;
    color: #9ccfd2;
}

.result-score strong {
    display: block;
    margin-top: 8px;
    color: #ffbf3d;
    font-size: 2.5rem;
}


.dialog-panel {
    max-width: 500px;
}

.controls-list {
    margin: 24px 0;
    padding: 0;
    list-style: none;
    text-align: left;
}

.controls-list li {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 0;
    color: #bce4e3;
    font-size: 0.72rem;
}

.controls-list li span {
    margin-left: auto;
}

kbd {
    min-width: 24px;
    padding: 5px 7px;
    text-align: center;
    color: #ffbf3d;
    background: #031923;
    border: 1px solid #397c83;
    border-radius: 4px;
    font: inherit;
}

@media (max-width: 560px) {
    .state-screen {
        padding: 12px;
    }

    .state-panel {
        padding: 28px 18px;
    }

    .start-panel {
        padding: 26px 20px;
    }

    .difficulty-options {
        grid-template-columns: 1fr;
    }
}

@media (max-height: 700px) and (min-width: 561px) {
    .start-panel {
        padding-block: 24px;
    }

    .start-panel .start-form {
        margin-top: 14px;
    }

    .start-panel .panel-divider {
        margin-block: 14px;
    }

    .start-panel .high-score-list li {
        padding-block: 4px;
    }
}