/* --- Base Reset & Core styling --- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    user-select: none;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: #050505;
    font-family: 'Share Tech Mono', monospace;
    color: #e0e0e0;
}

/* --- CRT & Scanline Retro Aesthetic --- */
#crt-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: 
        linear-gradient(rgba(18, 16, 16, 0) 50%, rgba(0, 0, 0, 0.25) 50%), 
        linear-gradient(90deg, rgba(255, 0, 0, 0.06), rgba(0, 255, 0, 0.02), rgba(0, 0, 255, 0.06));
    background-size: 100% 4px, 6px 100%;
    z-index: 9999;
    pointer-events: none;
    opacity: 0.8;
}

#crt-overlay::before {
    content: " ";
    display: block;
    position: absolute;
    top: 0; left: 0; bottom: 0; right: 0;
    background: radial-gradient(circle, rgba(0,0,0,0) 60%, rgba(0,0,0,0.85) 100%);
    pointer-events: none;
}

/* --- Damage Flash Overlay --- */
#damage-flash {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(180, 0, 0, 0.5);
    z-index: 999;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.05s ease-out;
}

#damage-flash.flash {
    opacity: 1;
    transition: none; /* instant red flash */
}

/* --- Game Container --- */
#game-container {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
    cursor: crosshair;
}

/* --- Overlay Menu Base --- */
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(5, 5, 5, 0.9);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
}

.overlay.active {
    opacity: 1;
    pointer-events: auto;
}

/* --- Menu Content & Glassmorphism --- */
.menu-content {
    width: 90%;
    max-width: 600px;
    background: rgba(15, 10, 10, 0.75);
    border: 2px solid #3a1010;
    box-shadow: 0 0 25px rgba(255, 0, 0, 0.15), inset 0 0 15px rgba(255, 0, 0, 0.05);
    border-radius: 4px;
    padding: 40px;
    text-align: center;
    backdrop-filter: blur(8px);
    display: flex;
    flex-direction: column;
    align-items: center;
}

#menu-overlay .menu-content {
    width: 90vw;
    max-width: 1440px;
    max-height: calc(100vh - 48px);
    padding: 32px;
    display: grid;
    grid-template-columns: minmax(260px, 0.95fr) minmax(320px, 1.1fr) minmax(280px, 0.95fr);
    grid-template-areas:
        "title title title"
        "subtitle subtitle subtitle"
        "divider divider divider"
        "brief controls leaderboard"
        "luna controls leaderboard"
        "gate controls leaderboard"
        "free start nostr"
        "manual manual manual";
    gap: 18px 22px;
    align-items: stretch;
    overflow-y: auto;
}

#menu-overlay .glitch-title {
    grid-area: title;
    font-size: clamp(2.6rem, 5vw, 4.8rem);
    margin-bottom: 0;
}

#menu-overlay .subtitle {
    grid-area: subtitle;
    margin-bottom: 0;
}

#menu-overlay .menu-divider {
    grid-area: divider;
    margin-bottom: 0;
}

#menu-overlay .mission-brief {
    grid-area: brief;
    margin-bottom: 0;
}

#menu-overlay .controls-guide {
    grid-area: controls;
    margin-bottom: 0;
}

#menu-overlay .start-leaderboard-panel {
    grid-area: leaderboard;
    margin-bottom: 0;
}

#menu-overlay .luna-negra-panel {
    grid-area: luna;
    margin-bottom: 0;
}

#menu-overlay .entry-gate-panel {
    grid-area: gate;
    margin-bottom: 0;
}

#menu-overlay #free-start-btn {
    grid-area: free;
}

#menu-overlay #start-btn {
    grid-area: start;
}

#menu-overlay #nostr-connect-btn {
    grid-area: nostr;
}

#menu-overlay #nostr-manual-section {
    grid-area: manual;
}

#menu-overlay .retro-btn {
    width: 100%;
    min-height: 50px;
}

#menu-overlay .start-leaderboard-list,
#menu-overlay .luna-negra-leaderboard-list {
    max-height: 260px;
    overflow-y: auto;
    padding-right: 4px;
}

/* Glitch Effect Title */
.glitch-title {
    font-size: 3.5rem;
    font-weight: 900;
    color: #ff2a2a;
    letter-spacing: 4px;
    position: relative;
    text-shadow: 0px 0px 8px rgba(255, 0, 0, 0.6);
    margin-bottom: 5px;
    animation: glitch-pulse 2s infinite;
}

@keyframes glitch-pulse {
    0%, 100% { transform: scale(1); text-shadow: 0px 0px 8px rgba(255, 0, 0, 0.6); }
    50% { transform: scale(1.02); text-shadow: 0px 0px 18px rgba(255, 0, 0, 0.9), 2px -1px 0 rgba(0,255,0,0.5); }
    98% { transform: scale(1.02); }
    99% { transform: skewX(-5deg) scale(0.98); }
}

.subtitle {
    font-size: 0.95rem;
    letter-spacing: 3px;
    color: #888888;
    margin-bottom: 25px;
}

.menu-divider {
    width: 100%;
    border: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, #5a1515, transparent);
    margin-bottom: 25px;
}

.mission-brief {
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(255, 0, 0, 0.1);
    padding: 15px 20px;
    font-size: 0.95rem;
    line-height: 1.5;
    text-align: left;
    margin-bottom: 25px;
    color: #b0b0b0;
    border-left: 3px solid #ff3333;
}

.mission-brief strong {
    color: #ff3333;
}

/* Controls Guide styling */
.controls-guide {
    text-align: left;
    width: 100%;
    background: rgba(20, 20, 20, 0.6);
    border: 1px solid #222;
    padding: 15px 20px;
    border-radius: 3px;
    margin-bottom: 30px;
}

.controls-guide h3 {
    font-size: 1.1rem;
    color: #00ff41;
    margin-bottom: 15px;
    letter-spacing: 2px;
    border-bottom: 1px solid rgba(0, 255, 65, 0.2);
    padding-bottom: 5px;
}

.controls-guide ul {
    list-style: none;
}

.controls-guide li {
    margin-bottom: 10px;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
}

.start-leaderboard-panel {
    width: 100%;
    margin-bottom: 24px;
    padding: 16px 18px;
    border: 1px solid rgba(0, 255, 65, 0.15);
    background: linear-gradient(180deg, rgba(5, 16, 8, 0.92), rgba(4, 10, 6, 0.88));
    box-shadow: inset 0 0 18px rgba(0, 255, 65, 0.06);
    text-align: left;
}

.start-leaderboard-header {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    align-items: baseline;
    margin-bottom: 12px;
}

.start-leaderboard-header h3 {
    color: #00ff41;
    font-size: 1rem;
    letter-spacing: 2px;
}

.start-leaderboard-status {
    color: #7eb78a;
    font-size: 0.78rem;
    letter-spacing: 1.4px;
}

.start-leaderboard-status[data-tone="error"] {
    color: #ff8b8b;
}

.start-leaderboard-status[data-tone="success"] {
    color: #b6ffbf;
}

.start-leaderboard-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.start-leaderboard-item,
.start-leaderboard-empty {
    display: grid;
    grid-template-columns: 48px minmax(0, 1fr) 72px 92px;
    gap: 10px;
    align-items: center;
    padding: 9px 10px;
    border: 1px solid rgba(255, 255, 255, 0.06);
    background: rgba(0, 0, 0, 0.32);
    font-size: 0.82rem;
}

.start-leaderboard-empty {
    display: block;
    color: #8ea18f;
    text-align: center;
}

.start-leaderboard-rank {
    color: #ff6666;
    font-weight: bold;
    letter-spacing: 1px;
}

.start-leaderboard-player {
    color: #e3efe5;
    overflow: hidden;
    text-overflow: ellipsis;
}

.start-leaderboard-score {
    color: #ffffff;
    text-align: right;
    font-weight: bold;
}

.start-leaderboard-level {
    color: #99bf9f;
    text-align: right;
}

.luna-negra-panel {
    width: 100%;
    margin-bottom: 22px;
    padding: 16px 18px;
    border: 1px solid rgba(185, 167, 255, 0.28);
    background: linear-gradient(180deg, rgba(10, 8, 24, 0.95), rgba(6, 4, 14, 0.9));
    box-shadow: inset 0 0 18px rgba(185, 167, 255, 0.08);
    text-align: left;
}

.luna-negra-header {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    align-items: baseline;
    margin-bottom: 12px;
}

.luna-negra-header h3 {
    color: #b9a7ff;
    font-size: 1rem;
    letter-spacing: 2px;
}

.luna-negra-status {
    color: #aaa0d8;
    font-size: 0.78rem;
    letter-spacing: 1.4px;
    text-align: right;
}

.luna-negra-status[data-tone="error"] {
    color: #ff8b8b;
}

.luna-negra-status[data-tone="success"] {
    color: #d9d0ff;
}

.luna-negra-player {
    display: grid;
    grid-template-columns: 42px minmax(0, 1fr);
    gap: 10px;
    align-items: center;
    margin-bottom: 12px;
    padding: 10px;
    border: 1px solid rgba(185, 167, 255, 0.16);
    background: rgba(0, 0, 0, 0.3);
}

.luna-negra-avatar {
    width: 42px;
    height: 42px;
    object-fit: cover;
    border: 1px solid rgba(185, 167, 255, 0.45);
}

.luna-negra-label,
.luna-negra-player small {
    display: block;
    color: #8f86b8;
    font-size: 0.72rem;
    letter-spacing: 1.2px;
    overflow: hidden;
    text-overflow: ellipsis;
}

.luna-negra-player strong {
    display: block;
    color: #f2eeff;
    overflow: hidden;
    text-overflow: ellipsis;
}

.luna-negra-leaderboard-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.luna-negra-leaderboard-list .start-leaderboard-rank {
    color: #b9a7ff;
}

.entry-gate-panel {
    width: 100%;
    margin-bottom: 22px;
    padding: 16px 18px;
    border: 1px solid rgba(255, 51, 51, 0.18);
    background: linear-gradient(180deg, rgba(18, 6, 6, 0.95), rgba(10, 4, 4, 0.88));
    box-shadow: inset 0 0 18px rgba(255, 51, 51, 0.06);
    text-align: left;
}

.entry-gate-header {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    align-items: baseline;
    margin-bottom: 12px;
}

.entry-gate-header h3 {
    color: #ff6666;
    font-size: 1rem;
    letter-spacing: 2px;
}

.entry-gate-pot {
    color: #ffd28a;
    font-size: 0.86rem;
    letter-spacing: 1.4px;
}

.entry-gate-status {
    color: #ffb2b2;
    font-size: 0.82rem;
    line-height: 1.45;
    margin-bottom: 14px;
}

.entry-gate-status[data-tone="success"] {
    color: #b6ffbf;
}

.entry-gate-status[data-tone="error"] {
    color: #ff8b8b;
}

.entry-gate-actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

.entry-gate-btn {
    width: 100%;
    padding: 11px 18px;
    font-size: 0.95rem;
}

.entry-gate-btn-secondary {
    background: linear-gradient(180deg, #22320f, #131d08);
    border-color: #9dff33;
    color: #d3ff9a;
}

.entry-gate-btn-secondary:hover {
    background: linear-gradient(180deg, #355116, #22340f);
    box-shadow: 0 0 15px rgba(157, 255, 51, 0.35);
}

.entry-invoice-output {
    width: 100%;
    min-height: 88px;
    margin-top: 12px;
    padding: 10px 12px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(0, 0, 0, 0.45);
    color: #f0f0f0;
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.78rem;
    resize: vertical;
}

@media (max-width: 1040px) {
    #menu-overlay .menu-content {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        grid-template-areas:
            "title title"
            "subtitle subtitle"
            "divider divider"
            "brief controls"
            "luna controls"
            "gate controls"
            "leaderboard leaderboard"
            "free start"
            "nostr nostr"
            "manual manual";
    }
}

.retro-btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

@media (max-width: 720px) {
    #menu-overlay {
        align-items: flex-start;
        padding: 12px 0;
    }

    #menu-overlay .menu-content {
        width: calc(100vw - 24px);
        max-height: calc(100vh - 24px);
        padding: 22px;
        grid-template-columns: 1fr;
        grid-template-areas:
            "title"
            "subtitle"
            "divider"
            "brief"
            "controls"
            "leaderboard"
            "luna"
            "gate"
            "free"
            "start"
            "nostr"
            "manual";
        gap: 14px;
    }

    #menu-overlay .glitch-title {
        font-size: clamp(2rem, 13vw, 2.8rem);
        letter-spacing: 2px;
    }

    #menu-overlay .subtitle {
        font-size: 0.82rem;
        letter-spacing: 1.6px;
    }

    #menu-overlay .controls-guide li {
        align-items: flex-start;
    }

    .entry-gate-actions {
        grid-template-columns: 1fr;
    }

    .start-leaderboard-item {
        grid-template-columns: 42px minmax(0, 1fr);
    }

    .start-leaderboard-score,
    .start-leaderboard-level {
        text-align: left;
    }
}

.key {
    background-color: #333;
    border: 1px solid #555;
    border-bottom: 3px solid #111;
    border-radius: 4px;
    padding: 2px 8px;
    font-weight: bold;
    font-size: 0.85rem;
    margin-right: 5px;
    color: #ffffff;
    display: inline-block;
    min-width: 25px;
    text-align: center;
}

/* Retro Neon Buttons */
.retro-btn {
    background: linear-gradient(180deg, #501010, #300505);
    border: 1px solid #ff3333;
    color: #ff9999;
    padding: 12px 35px;
    font-family: 'Share Tech Mono', monospace;
    font-size: 1.1rem;
    font-weight: bold;
    letter-spacing: 3px;
    cursor: pointer;
    border-radius: 3px;
    transition: all 0.2s ease;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.5);
    outline: none;
}

.retro-btn:hover {
    background: linear-gradient(180deg, #801818, #500808);
    color: #ffffff;
    box-shadow: 0 0 15px rgba(255, 0, 0, 0.5);
    transform: translateY(-2px);
}

.retro-btn:active {
    transform: translateY(1px);
    box-shadow: 0 2px 5px rgba(255, 0, 0, 0.3);
}

/* Death Menu Modifiers */
.menu-content.death {
    border-color: #800000;
    box-shadow: 0 0 35px rgba(255, 0, 0, 0.4);
    background: rgba(10, 2, 2, 0.9);
}

.death-title {
    font-size: 3.5rem;
    color: #ff0000;
    letter-spacing: 5px;
    text-shadow: 0 0 15px rgba(255, 0, 0, 0.8);
    margin-bottom: 10px;
    animation: pulse-red 1.5s infinite;
}

@keyframes pulse-red {
    0%, 100% { text-shadow: 0 0 10px rgba(255,0,0,0.6); }
    50% { text-shadow: 0 0 25px rgba(255,0,0,1); }
}

.death-message {
    color: #b08888;
    margin-bottom: 30px;
    font-style: italic;
    font-family: 'Special Elite', cursive;
}

.death-btn {
    border-color: #ff0000;
    color: #ff6666;
}

/* Victory Menu Modifiers */
.menu-content.victory {
    border-color: #0f4a1c;
    box-shadow: 0 0 30px rgba(0, 255, 65, 0.3);
    background: rgba(2, 10, 5, 0.9);
}

.victory-title {
    font-size: 3.5rem;
    color: #00ff41;
    letter-spacing: 5px;
    text-shadow: 0 0 15px rgba(0, 255, 65, 0.8);
    margin-bottom: 10px;
    animation: pulse-green 1.5s infinite;
}

@keyframes pulse-green {
    0%, 100% { text-shadow: 0 0 10px rgba(0,255,65,0.6); }
    50% { text-shadow: 0 0 25px rgba(0,255,65,1); }
}

.victory-message {
    color: #b0ffc0;
    margin-bottom: 30px;
}

.victory-btn {
    background: linear-gradient(180deg, #0f3f1e, #061f0e);
    border-color: #00ff41;
    color: #a3ffa8;
}

.victory-btn:hover {
    background: linear-gradient(180deg, #1b6833, #0a3d1b);
    box-shadow: 0 0 15px rgba(0, 255, 65, 0.5);
}

/* --- Crosshair (Reticle) --- */
#crosshair {
    position: absolute;
    top: calc(50% - 55px);
    left: 50%;
    width: 10px;
    height: 10px;
    transform: translate(-50%, -50%);
    pointer-events: none;
    z-index: 10;
}

#crosshair::before, #crosshair::after {
    content: '';
    position: absolute;
    background-color: rgba(0, 255, 65, 0.75);
}

/* Crosshair vertical line */
#crosshair::before {
    top: -6px;
    left: 4px;
    width: 2px;
    height: 22px;
}

/* Crosshair horizontal line */
#crosshair::after {
    top: 4px;
    left: -6px;
    width: 22px;
    height: 2px;
}

/* Action when crosshair is firing */
#crosshair.firing::before {
    transform: scaleY(1.5);
    background-color: #ff3333;
}
#crosshair.firing::after {
    transform: scaleX(1.5);
    background-color: #ff3333;
}

/* --- Feedback Messages --- */
#feedback-message {
    position: absolute;
    top: 35%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #ff3333;
    font-size: 1.5rem;
    font-weight: bold;
    text-shadow: 0 0 10px rgba(0, 0, 0, 0.8), 0 0 5px #ff3333;
    letter-spacing: 2px;
    pointer-events: none;
    z-index: 5;
    opacity: 0;
    transition: opacity 0.15s ease-in-out;
    text-align: center;
}

#feedback-message.active {
    opacity: 1;
}

/* --- HUD Styling --- */
#hud {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 110px;
    background: linear-gradient(180deg, #120303 0%, #080101 100%);
    border-top: 4px solid #2d0b0b;
    box-shadow: inset 0 8px 16px rgba(0,0,0,0.8);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 40px;
    z-index: 5;
    border-bottom: 4px solid #1a0404;
}

/* HUD Panels */
.hud-panel {
    display: flex;
    align-items: center;
    height: 100%;
}

.left-panel {
    width: 35%;
    gap: 30px;
}

.center-panel {
    width: 30%;
    justify-content: center;
    gap: 20px;
    border-left: 2px solid #2d0b0b;
    border-right: 2px solid #2d0b0b;
}

.right-panel {
    width: 35%;
    justify-content: flex-end;
}

/* HUD Stats */
.hud-stat {
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-width: 150px;
}

.align-right {
    align-items: flex-end;
}

.hud-label {
    font-size: 0.85rem;
    color: #8a3030;
    letter-spacing: 2px;
    margin-bottom: 4px;
    font-weight: bold;
}

.hud-label-small {
    font-size: 0.75rem;
    color: #6d6d6d;
    letter-spacing: 1px;
    text-align: center;
    display: block;
    margin-bottom: 2px;
}

.hud-value {
    font-size: 2.2rem;
    font-weight: 900;
    color: #ff3333;
    text-shadow: 0 0 10px rgba(255, 51, 51, 0.4);
    line-height: 1;
}

.hud-value-small {
    font-size: 1.5rem;
    color: #8f2929;
    align-self: flex-end;
    margin-bottom: 2px;
}

/* Bar Gauges */
.hud-bar-container {
    width: 100%;
    height: 8px;
    background-color: #1a0808;
    border: 1px solid #301010;
    margin-top: 5px;
    border-radius: 1px;
    overflow: hidden;
}

.hud-bar {
    height: 100%;
    width: 100%;
    transition: width 0.2s ease-out;
}

.hud-bar.health {
    background: linear-gradient(90deg, #801010, #ff2a2a);
    box-shadow: 0 0 8px rgba(255, 42, 42, 0.5);
}

.hud-bar.armor {
    background: linear-gradient(90deg, #104080, #2a7aff);
    box-shadow: 0 0 8px rgba(42, 122, 255, 0.5);
}

/* Biomonitor in Center */
.biomonitor {
    width: 60px;
    height: 60px;
    border: 2px solid #205020;
    background: #051205;
    border-radius: 50%;
    overflow: hidden;
    box-shadow: inset 0 0 10px rgba(0,255,65,0.3), 0 0 8px rgba(0,255,65,0.15);
    display: flex;
    justify-content: center;
    align-items: center;
}

.hud-status-face {
    display: flex;
    align-items: center;
    justify-content: center;
}

.hud-tracker {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hud-counter {
    font-size: 2.2rem;
    font-weight: bold;
    color: #00ff41;
    text-shadow: 0 0 8px rgba(0, 255, 65, 0.4);
    line-height: 1;
}

.hud-counter.fuse {
    color: #00d9ff;
    text-shadow: 0 0 8px rgba(0, 217, 255, 0.4);
}

/* Ammo specific layout */
.ammo-display {
    display: flex;
    align-items: flex-end;
    gap: 5px;
    line-height: 1;
}

.hud-divider {
    font-size: 1.8rem;
    color: #5a1e1e;
    margin: 0 2px;
}

.weapon-name {
    font-size: 0.75rem;
    color: #6d6d6d;
    letter-spacing: 1px;
    margin-top: 6px;
    text-transform: uppercase;
}

/* --- Refugio / Upgrade Shop Styling --- */
.shop-content {
    max-width: 900px !important;
    width: 95% !important;
}

.points-indicator {
    font-size: 1.4rem;
    font-weight: bold;
    color: #00ff41;
    text-shadow: 0 0 10px rgba(0, 255, 65, 0.4);
    background: rgba(0, 255, 65, 0.05);
    border: 1px dashed rgba(0, 255, 65, 0.3);
    padding: 10px 20px;
    border-radius: 4px;
    margin-bottom: 20px;
    letter-spacing: 2px;
}

.shop-container {
    display: flex;
    flex-direction: row;
    justify-content: center;
    gap: 20px;
    width: 100%;
    margin: 15px 0 30px 0;
    flex-wrap: wrap;
}

.upgrade-card {
    flex: 1;
    min-width: 250px;
    max-width: 280px;
    background: rgba(10, 20, 12, 0.6);
    border: 1px solid rgba(0, 255, 65, 0.2);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.6), inset 0 0 10px rgba(0, 255, 65, 0.05);
    border-radius: 4px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    transition: all 0.3s ease;
}

.upgrade-card:hover {
    border-color: rgba(0, 255, 65, 0.5);
    box-shadow: 0 0 20px rgba(0, 255, 65, 0.2), inset 0 0 10px rgba(0, 255, 65, 0.1);
    transform: translateY(-4px);
}

.card-tag {
    position: absolute;
    top: -10px;
    left: 15px;
    background: #0f4a1c;
    border: 1px solid #00ff41;
    color: #00ff41;
    font-size: 0.7rem;
    font-weight: bold;
    padding: 2px 8px;
    border-radius: 3px;
    letter-spacing: 1px;
}

.upgrade-card h3 {
    font-size: 1.3rem;
    color: #ffffff;
    margin: 10px 0 12px 0;
    letter-spacing: 2px;
    text-shadow: 0 0 5px rgba(255, 255, 255, 0.3);
}

.card-desc {
    font-size: 0.85rem;
    color: #a0b0a5;
    line-height: 1.4;
    text-align: center;
    margin-bottom: 15px;
    flex-grow: 1;
}

.upgrade-cost {
    font-size: 0.95rem;
    color: #ffaa00;
    text-shadow: 0 0 5px rgba(255, 170, 0, 0.3);
    font-weight: bold;
    margin-bottom: 15px;
    letter-spacing: 1px;
}

.shop-btn {
    width: 100%;
    padding: 8px 15px !important;
    font-size: 0.9rem !important;
    background: linear-gradient(180deg, #103015, #051508) !important;
    border-color: #00ff41 !important;
    color: #a3ffa8 !important;
}

.shop-btn:hover:not(:disabled) {
    background: linear-gradient(180deg, #1b5825, #08250f) !important;
    box-shadow: 0 0 12px rgba(0, 255, 65, 0.5) !important;
}

.shop-btn:disabled {
    background: rgba(20, 20, 20, 0.5) !important;
    border-color: #444 !important;
    color: #666 !important;
    cursor: not-allowed;
    box-shadow: none !important;
    transform: none !important;
}

.shop-btn.unlocked {
    background: rgba(0, 255, 65, 0.15) !important;
    border-color: #00ff41 !important;
    color: #ffffff !important;
    box-shadow: inset 0 0 5px rgba(0, 255, 65, 0.3) !important;
    cursor: default;
    pointer-events: none;
}

.next-level-btn {
    margin-top: 10px;
    font-size: 1.2rem !important;
    padding: 12px 45px !important;
    background: linear-gradient(180deg, #104080, #082045) !important;
    border-color: #00d9ff !important;
    color: #a3f3ff !important;
    text-shadow: 0 0 5px rgba(0, 217, 255, 0.5);
    box-shadow: 0 0 15px rgba(0, 217, 255, 0.2);
}

.next-level-btn:hover {
    background: linear-gradient(180deg, #1b60c0, #0f356f) !important;
    box-shadow: 0 0 25px rgba(0, 217, 255, 0.6) !important;
    color: #ffffff !important;
}

/* --- Acid Damage Flash Modifier --- */
#damage-flash.acid {
    background-color: rgba(0, 180, 0, 0.45) !important;
}

/* --- Minijuego de Cableado --- */
.wiring-content {
    max-width: 550px !important;
    border-color: #ffa500 !important;
    box-shadow: 0 0 30px rgba(255, 165, 0, 0.25) !important;
    background: rgba(15, 10, 5, 0.95) !important;
}

#wiring-panel-container {
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #0d0d0f;
    border: 2px solid #333;
    padding: 10px;
    border-radius: 4px;
    box-shadow: inset 0 0 15px rgba(0,0,0,0.9);
}

#wiring-canvas {
    background-color: #121216;
    border-radius: 3px;
    cursor: crosshair;
}

/* --- BOSS HEALTH BAR (Level 4) --- */
.boss-hud {
    position: fixed;
    top: 50px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 800;
    text-align: center;
    pointer-events: none;
    transition: opacity 0.5s ease;
}

.boss-hud.hidden {
    display: none;
}

.boss-name {
    font-family: 'Share Tech Mono', monospace;
    font-size: 1.4rem;
    color: #ff3333;
    text-shadow: 0 0 10px rgba(255, 50, 50, 0.8), 0 0 30px rgba(255, 0, 0, 0.4);
    letter-spacing: 4px;
    margin-bottom: 6px;
    animation: boss-name-flicker 3s infinite;
}

@keyframes boss-name-flicker {
    0%, 92%, 100% { opacity: 1; }
    93% { opacity: 0.7; }
    94% { opacity: 1; }
    96% { opacity: 0.6; }
    97% { opacity: 1; }
}

.boss-health-bar-container {
    width: 400px;
    height: 16px;
    background: rgba(20, 5, 5, 0.85);
    border: 2px solid #660000;
    border-radius: 2px;
    box-shadow: 0 0 15px rgba(255, 0, 0, 0.3), inset 0 0 8px rgba(0, 0, 0, 0.9);
    overflow: hidden;
    position: relative;
}

.boss-health-fill {
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, #cc0000, #ff3300, #ff5500, #ff3300, #cc0000);
    background-size: 200% 100%;
    animation: boss-health-flow 2s linear infinite;
    transition: width 0.3s ease-out;
    box-shadow: 0 0 8px rgba(255, 50, 0, 0.6);
    position: relative;
}

.boss-health-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 50%;
    background: linear-gradient(180deg, rgba(255,255,255,0.15), transparent);
}

@keyframes boss-health-flow {
    0% { background-position: 0% 0%; }
    100% { background-position: 200% 0%; }
}

.boss-hud.boss-low-health .boss-health-fill {
    animation: boss-health-flow 2s linear infinite, boss-health-pulse 0.5s ease-in-out infinite;
}

.boss-hud.boss-low-health .boss-name {
    animation: boss-name-flicker 3s infinite, boss-health-pulse 0.5s ease-in-out infinite;
}

.boss-hud.boss-low-health .boss-health-bar-container {
    border-color: #ff0000;
    box-shadow: 0 0 25px rgba(255, 0, 0, 0.6), inset 0 0 8px rgba(0, 0, 0, 0.9);
}

@keyframes boss-health-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}