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

:root {
    --bg: #071018;
    --panel: #0d1a24;
    --panel-light: #142735;
    --cyan: #4ee7ff;
    --green: #61f5a1;
    --white: #f4fbff;
    --muted: #91a9b8;
    --danger: #ff607d;
}

body {
    width: 100%;
    height: 100vh;
    overflow: hidden;
    background:
        radial-gradient(
            circle at 50% 20%,
            #153444 0%,
            #071018 55%,
            #03070b 100%
        );
    color: var(--white);
    font-family:
        Arial,
        Helvetica,
        sans-serif;
}

button,
input,
select {
    font-family: inherit;
}

button {
    cursor: pointer;
}

#app {
    width: 100%;
    height: 100%;
}


/* =========================
   PANTALLAS
========================= */

.screen {
    display: none;
    width: 100%;
    height: 100%;
}

.screen.active {
    display: flex;
}


/* =========================
   MENÚ
========================= */

#menuScreen {
    align-items: center;
    justify-content: center;
}

.menu-panel {
    width: min(500px, 90%);
    padding: 50px 40px;
    text-align: center;
}

.logo {
    display: flex;
    flex-direction: column;
    line-height: 0.9;
    margin-bottom: 25px;
}

.logo span {
    font-size: clamp(45px, 8vw, 78px);
    font-weight: 900;
    letter-spacing: -4px;
}

.logo strong {
    font-size: clamp(30px, 5vw, 50px);
    letter-spacing: 10px;
    color: var(--cyan);
}

.subtitle {
    color: var(--muted);
    margin-bottom: 45px;
    font-size: 15px;
}

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

.main-button,
.secondary-button {
    width: 100%;
    min-height: 54px;
    border-radius: 8px;
    border: none;
    font-size: 15px;
    font-weight: 800;
    letter-spacing: 1px;
    transition:
        transform 0.15s,
        filter 0.15s,
        background 0.15s;
}

.main-button {
    background: var(--cyan);
    color: #041016;
}

.main-button:hover,
.secondary-button:hover {
    transform: translateY(-2px);
    filter: brightness(1.12);
}

.main-button:active,
.secondary-button:active {
    transform: translateY(0);
}

.secondary-button {
    background: #12232f;
    color: var(--white);
    border: 1px solid #294452;
}


/* =========================
   PANELES
========================= */

.panel {
    width: min(700px, 92%);
    max-height: 90vh;
    overflow-y: auto;
    margin: auto;
    padding: 40px;
    border-radius: 18px;
    background:
        linear-gradient(
            145deg,
            rgba(19, 39, 52, 0.97),
            rgba(7, 17, 25, 0.97)
        );
    border: 1px solid #254252;
    box-shadow:
        0 30px 80px rgba(0, 0, 0, 0.45);
}

.panel h1 {
    text-align: center;
    margin-bottom: 30px;
    font-size: 30px;
}


/* =========================
   CÓMO JUGAR
========================= */

.instructions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 25px;
}

.instruction-card {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 16px;
    background: #0b1923;
    border: 1px solid #1f3846;
    border-radius: 10px;
}

.instruction-card .icon {
    min-width: 50px;
    text-align: center;
    color: var(--cyan);
    font-weight: 900;
    font-size: 13px;
}

.instruction-card h3 {
    font-size: 13px;
    margin-bottom: 5px;
}

.instruction-card p {
    color: var(--muted);
    font-size: 12px;
    line-height: 1.4;
}

.tips {
    padding: 18px;
    margin-bottom: 25px;
    background: #08141c;
    border-radius: 10px;
    border-left: 3px solid var(--cyan);
}

.tips p {
    color: #b8cbd4;
    font-size: 13px;
    margin-bottom: 9px;
}

.tips p:last-child {
    margin-bottom: 0;
}


/* =========================
   CONFIGURACIÓN
========================= */

.settings-panel {
    width: min(760px, 92%);
}

.setting-row {
    display: grid;
    grid-template-columns: 1fr 160px 60px;
    align-items: center;
    gap: 20px;
    padding: 18px 0;
    border-bottom: 1px solid #1d3441;
}

.setting-row:last-of-type {
    margin-bottom: 30px;
}

.setting-row h3 {
    font-size: 14px;
    margin-bottom: 5px;
}

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

.setting-row input[type="range"] {
    width: 100%;
}

.setting-row select {
    width: 100%;
    background: #091720;
    color: var(--white);
    border: 1px solid #294452;
    padding: 10px;
    border-radius: 6px;
}

#volumeValue {
    font-size: 12px;
    color: var(--cyan);
}

.toggle {
    border: none;
    border-radius: 20px;
    padding: 9px 18px;
    font-weight: 800;
    background: #26353d;
    color: #879ba5;
}

.toggle.active {
    background: var(--green);
    color: #06120b;
}


/* =========================
   JUEGO
========================= */

.game-screen {
    position: relative;
    align-items: center;
    justify-content: center;
    background: #03080d;
}

#gameContainer {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

#gameCanvas {
    display: block;
    background: #08131a;
    cursor: crosshair;
}


/* =========================
   HUD
========================= */

#hud {
    position: absolute;
    top: 18px;
    left: 0;
    width: 100%;
    pointer-events: none;
}

.score-box {
    width: 210px;
    margin: auto;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 18px;
    padding: 10px 20px;
    background: rgba(4, 13, 19, 0.8);
    border: 1px solid #294452;
    border-radius: 12px;
    backdrop-filter: blur(5px);
}

.score-player,
.score-cpu {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 55px;
}

.score-player span,
.score-cpu span {
    font-size: 9px;
    letter-spacing: 1px;
    color: var(--muted);
}

.score-player strong,
.score-cpu strong {
    font-size: 28px;
}

.score-separator {
    color: #607784;
    font-size: 20px;
}

#gameHint {
    position: absolute;
    left: 20px;
    top: 20px;
    font-size: 10px;
    color: #66818e;
}

#pauseButton {
    pointer-events: auto;
    position: absolute;
    right: 20px;
    top: 0;
    width: 42px;
    height: 42px;
    border-radius: 8px;
    border: 1px solid #294452;
    background: rgba(8, 21, 29, 0.9);
    color: var(--white);
    font-size: 13px;
}


/* =========================
   CARGA
========================= */

#chargeContainer {
    position: absolute;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    width: 180px;
    opacity: 0;
    transition: opacity 0.15s;
    pointer-events: none;
}

#chargeContainer.active {
    opacity: 1;
}

#chargeContainer span {
    display: block;
    text-align: center;
    font-size: 9px;
    color: #90aab7;
    letter-spacing: 2px;
    margin-bottom: 5px;
}

.charge-bar {
    width: 100%;
    height: 7px;
    border-radius: 5px;
    overflow: hidden;
    background: #14242d;
    border: 1px solid #294452;
}

#chargeFill {
    width: 0%;
    height: 100%;
    background: var(--cyan);
}


/* =========================
   MENSAJES
========================= */

.center-message {
    position: absolute;
    left: 50%;
    top: 48%;
    transform: translate(-50%, -50%);
    text-align: center;
    pointer-events: none;
    text-shadow:
        0 4px 20px rgba(0, 0, 0, 0.8);
}

.center-message h2 {
    font-size: clamp(28px, 5vw, 52px);
    letter-spacing: 3px;
}

.center-message p {
    margin-top: 10px;
    color: var(--cyan);
    font-size: 12px;
    letter-spacing: 2px;
}

.hidden {
    display: none !important;
}


/* =========================
   OVERLAY PAUSA
========================= */

.overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(2, 8, 12, 0.78);
    backdrop-filter: blur(6px);
}

.pause-panel {
    width: min(360px, 85%);
    padding: 35px;
    text-align: center;
    border-radius: 15px;
    background: #0d1d27;
    border: 1px solid #294452;
}

.pause-panel h1 {
    font-size: 35px;
    margin-bottom: 25px;
}

.pause-panel button {
    margin-bottom: 10px;
}


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

@media (max-width: 700px) {

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

    .panel {
        padding: 25px;
    }

    .setting-row {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .setting-row input,
    .setting-row select,
    .setting-row button {
        width: 100%;
    }

    #gameHint {
        display: none;
    }
}

@media (max-height: 650px) {

    .menu-panel {
        padding: 20px;
    }

    .logo {
        margin-bottom: 15px;
    }

    .subtitle {
        margin-bottom: 20px;
    }

}