/* ============================================================
   NEXUS STRIKE — Complete UI Stylesheet
   Futuristic neon arcade aesthetic
   ============================================================ */

:root {
    /* Core palette */
    --cyan: #00f0ff;
    --cyan-dim: #00a0aa;
    --magenta: #ff00aa;
    --magenta-dim: #aa0070;
    --electric: #4040ff;
    --gold: #ffcc00;
    --red: #ff2244;
    --green: #00ff88;
    --white: #e8f0ff;
    --ghost: rgba(200, 220, 255, 0.08);
    --bg-dark: #040810;
    --bg-panel: rgba(4, 12, 24, 0.92);
    --bg-panel-light: rgba(8, 20, 40, 0.85);
    --border-glow: rgba(0, 240, 255, 0.25);

    /* Typography */
    --font-display: 'Orbitron', monospace;
    --font-body: 'Rajdhani', sans-serif;
    --font-mono: 'Share Tech Mono', monospace;

    /* Spacing */
    --gap-xs: 4px;
    --gap-sm: 8px;
    --gap-md: 16px;
    --gap-lg: 24px;
    --gap-xl: 40px;
}

/* ---- RESET & BASE ---- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

body {
    background: var(--bg-dark);
    color: var(--white);
    font-family: var(--font-body);
    overflow: hidden;
    width: 100vw;
    height: 100vh;
    cursor: none;
    user-select: none;
    -webkit-user-select: none;
}

canvas { display: block; position: fixed; top: 0; left: 0; z-index: 0; }

.hidden { display: none !important; }

.screen {
    position: fixed; inset: 0;
    z-index: 100;
    display: flex; align-items: center; justify-content: center;
}

/* ---- LOADING SCREEN ---- */
#loading-screen {
    position: fixed; inset: 0; z-index: 9999;
    background: var(--bg-dark);
    display: flex; align-items: center; justify-content: center;
    flex-direction: column;
}

.loader-content { text-align: center; }

.loader-title {
    font-family: var(--font-display);
    font-size: clamp(28px, 5vw, 56px);
    font-weight: 900;
    letter-spacing: 0.2em;
    color: var(--cyan);
    text-shadow: 0 0 30px rgba(0, 240, 255, 0.5), 0 0 60px rgba(0, 240, 255, 0.2);
    margin-bottom: var(--gap-xl);
    animation: pulse-glow 2s ease-in-out infinite;
}

.loader-bar-container {
    width: clamp(200px, 40vw, 400px);
    height: 4px;
    background: rgba(0, 240, 255, 0.1);
    border-radius: 2px;
    margin: 0 auto var(--gap-md);
    overflow: hidden;
}

.loader-bar {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, var(--cyan), var(--magenta));
    border-radius: 2px;
    transition: width 0.3s ease;
    box-shadow: 0 0 12px var(--cyan);
}

.loader-text {
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.3em;
    color: var(--cyan-dim);
    animation: blink 1s step-end infinite;
}

/* ---- MAIN MENU ---- */
.menu-overlay {
    position: absolute; inset: 0;
    background: linear-gradient(135deg, rgba(0,0,0,0.7) 0%, rgba(0,0,0,0.3) 50%, rgba(0,0,0,0.7) 100%);
    backdrop-filter: blur(2px);
}

.menu-content {
    position: relative; z-index: 2;
    display: flex; flex-direction: column; align-items: center;
    gap: var(--gap-xl);
    padding: var(--gap-xl);
    animation: fade-slide-up 0.8s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.menu-title-group { text-align: center; }

.menu-subtitle {
    font-family: var(--font-mono);
    font-size: clamp(10px, 1.4vw, 14px);
    letter-spacing: 0.4em;
    color: var(--cyan-dim);
    margin-bottom: var(--gap-sm);
}

.menu-title {
    font-family: var(--font-display);
    font-size: clamp(40px, 8vw, 90px);
    font-weight: 900;
    letter-spacing: 0.12em;
    color: var(--white);
    text-shadow: 0 0 40px rgba(0, 240, 255, 0.4);
    line-height: 1;
}

.title-accent {
    color: var(--cyan);
    text-shadow: 0 0 30px rgba(0, 240, 255, 0.6), 0 0 60px rgba(0, 240, 255, 0.3);
}

.menu-tagline {
    font-family: var(--font-mono);
    font-size: clamp(11px, 1.6vw, 16px);
    letter-spacing: 0.5em;
    color: var(--magenta);
    margin-top: var(--gap-md);
    text-shadow: 0 0 20px rgba(255, 0, 170, 0.4);
}

.menu-buttons {
    display: flex; flex-direction: column; gap: var(--gap-md);
    width: clamp(240px, 30vw, 340px);
}

/* ---- BUTTONS ---- */
.menu-btn {
    position: relative;
    display: flex; align-items: center; gap: var(--gap-md);
    width: 100%;
    padding: var(--gap-md) var(--gap-lg);
    background: var(--bg-panel);
    border: 1px solid var(--border-glow);
    border-radius: 4px;
    color: var(--white);
    font-family: var(--font-body);
    font-size: 16px;
    font-weight: 600;
    letter-spacing: 0.15em;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    overflow: hidden;
    text-align: left;
}

.menu-btn::before {
    content: '';
    position: absolute; left: 0; top: 0; bottom: 0;
    width: 3px;
    background: var(--cyan);
    opacity: 0;
    transition: opacity 0.25s;
}

.menu-btn:hover {
    background: rgba(0, 240, 255, 0.08);
    border-color: var(--cyan);
    transform: translateX(6px);
    box-shadow: 0 0 20px rgba(0, 240, 255, 0.15), inset 0 0 20px rgba(0, 240, 255, 0.05);
}

.menu-btn:hover::before { opacity: 1; }

.menu-btn:active { transform: translateX(6px) scale(0.98); }

.menu-btn.primary {
    background: linear-gradient(135deg, rgba(0, 240, 255, 0.15), rgba(0, 240, 255, 0.05));
    border-color: var(--cyan);
    font-size: 18px;
}

.menu-btn.primary:hover {
    background: linear-gradient(135deg, rgba(0, 240, 255, 0.25), rgba(0, 240, 255, 0.1));
    box-shadow: 0 0 30px rgba(0, 240, 255, 0.25), inset 0 0 30px rgba(0, 240, 255, 0.08);
}

.menu-btn.danger { border-color: rgba(255, 34, 68, 0.3); }
.menu-btn.danger:hover {
    border-color: var(--red);
    background: rgba(255, 34, 68, 0.1);
    box-shadow: 0 0 20px rgba(255, 34, 68, 0.2);
}
.menu-btn.danger::before { background: var(--red); }

.btn-icon {
    font-size: 18px;
    width: 24px;
    text-align: center;
    color: var(--cyan);
    flex-shrink: 0;
}

.menu-btn.danger .btn-icon { color: var(--red); }

.btn-text { flex: 1; }

.btn-sub {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.2em;
    color: var(--cyan-dim);
    opacity: 0.7;
}

.menu-footer {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.2em;
    color: rgba(0, 240, 255, 0.3);
    display: flex; gap: var(--gap-md);
}

/* ---- PANELS (Settings, Controls, Credits) ---- */
.panel-overlay {
    position: absolute; inset: 0;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
}

.panel-box {
    position: relative; z-index: 2;
    background: var(--bg-panel);
    border: 1px solid var(--border-glow);
    border-radius: 8px;
    padding: var(--gap-xl) clamp(24px, 4vw, 48px);
    width: clamp(300px, 40vw, 480px);
    max-height: 85vh;
    overflow-y: auto;
    display: flex; flex-direction: column; gap: var(--gap-lg);
    animation: fade-scale-in 0.4s cubic-bezier(0.16, 1, 0.3, 1) both;
    box-shadow: 0 0 40px rgba(0, 240, 255, 0.08), 0 20px 60px rgba(0, 0, 0, 0.5);
}

.panel-title {
    font-family: var(--font-display);
    font-size: clamp(20px, 3vw, 28px);
    font-weight: 700;
    letter-spacing: 0.2em;
    color: var(--cyan);
    text-align: center;
    text-shadow: 0 0 20px rgba(0, 240, 255, 0.3);
}

/* Settings rows */
.setting-row {
    display: flex; align-items: center; justify-content: space-between;
    gap: var(--gap-md);
    padding: var(--gap-sm) 0;
    border-bottom: 1px solid rgba(0, 240, 255, 0.06);
}

.setting-row label {
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.15em;
    color: rgba(200, 220, 255, 0.7);
}

input[type="range"] {
    -webkit-appearance: none;
    width: 120px; height: 4px;
    background: rgba(0, 240, 255, 0.15);
    border-radius: 2px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px; height: 14px;
    background: var(--cyan);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 8px var(--cyan);
}

select {
    background: var(--bg-panel);
    border: 1px solid var(--border-glow);
    color: var(--white);
    font-family: var(--font-mono);
    font-size: 12px;
    padding: 6px 12px;
    border-radius: 4px;
    outline: none;
    cursor: pointer;
}

/* Toggle switch */
.toggle-switch { position: relative; width: 44px; height: 24px; display: inline-block; }
.toggle-switch input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
    position: absolute; inset: 0;
    background: rgba(0, 240, 255, 0.1);
    border: 1px solid rgba(0, 240, 255, 0.2);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s;
}
.toggle-slider::before {
    content: '';
    position: absolute; left: 3px; top: 3px;
    width: 16px; height: 16px;
    background: var(--white);
    border-radius: 50%;
    transition: all 0.3s;
}
.toggle-switch input:checked + .toggle-slider {
    background: rgba(0, 240, 255, 0.25);
    border-color: var(--cyan);
}
.toggle-switch input:checked + .toggle-slider::before {
    transform: translateX(20px);
    background: var(--cyan);
    box-shadow: 0 0 8px var(--cyan);
}

/* Controls grid */
.controls-grid { display: flex; flex-direction: column; gap: var(--gap-sm); }

.control-item {
    display: flex; align-items: center; justify-content: space-between;
    padding: var(--gap-sm) var(--gap-md);
    background: rgba(0, 240, 255, 0.03);
    border: 1px solid rgba(0, 240, 255, 0.06);
    border-radius: 4px;
}

.key {
    font-family: var(--font-display);
    font-size: 13px;
    font-weight: 700;
    color: var(--cyan);
    letter-spacing: 0.1em;
}

.control-desc {
    font-family: var(--font-mono);
    font-size: 12px;
    color: rgba(200, 220, 255, 0.6);
    letter-spacing: 0.2em;
}

/* Credits */
.credits-content { text-align: center; }
.credit-section { margin-bottom: var(--gap-lg); }
.credit-section h3 {
    font-family: var(--font-display);
    font-size: 12px;
    letter-spacing: 0.3em;
    color: var(--cyan);
    margin-bottom: var(--gap-sm);
}
.credit-section p {
    font-size: 14px;
    color: rgba(200, 220, 255, 0.6);
    line-height: 1.6;
}

/* ---- IN-GAME HUD ---- */
#game-hud {
    position: fixed; inset: 0;
    z-index: 50;
    pointer-events: none;
}

.hud-top {
    position: absolute; top: 0; left: 0; right: 0;
    display: flex; align-items: flex-start; justify-content: space-between;
    padding: var(--gap-md) var(--gap-lg);
    gap: var(--gap-lg);
}

.hud-health {
    display: flex; align-items: center; gap: var(--gap-sm);
}

.health-icon {
    font-size: 20px;
    color: var(--red);
    text-shadow: 0 0 10px rgba(255, 34, 68, 0.5);
    animation: heartbeat 1.5s ease-in-out infinite;
}

.health-bar-outer {
    width: clamp(150px, 20vw, 260px);
    height: 10px;
    background: rgba(255, 34, 68, 0.12);
    border: 1px solid rgba(255, 34, 68, 0.2);
    border-radius: 5px;
    position: relative;
    overflow: hidden;
}

.health-bar-inner {
    position: absolute; left: 0; top: 0; bottom: 0;
    width: 100%;
    background: linear-gradient(90deg, var(--red), #ff6644);
    border-radius: 4px;
    transition: width 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 0 8px rgba(255, 34, 68, 0.4);
}

.health-bar-damage {
    position: absolute; left: 0; top: 0; bottom: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 4px;
    transition: width 0.6s ease 0.2s;
}

.health-text {
    font-family: var(--font-display);
    font-size: 14px;
    font-weight: 700;
    color: var(--white);
    min-width: 36px;
    text-align: right;
}

.hud-score, .hud-wave {
    text-align: center;
}

.score-label, .wave-label {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.3em;
    color: rgba(200, 220, 255, 0.4);
}

.score-value {
    font-family: var(--font-display);
    font-size: clamp(20px, 3vw, 32px);
    font-weight: 800;
    color: var(--gold);
    text-shadow: 0 0 15px rgba(255, 204, 0, 0.3);
}

.wave-value {
    font-family: var(--font-display);
    font-size: clamp(20px, 3vw, 32px);
    font-weight: 800;
    color: var(--cyan);
    text-shadow: 0 0 15px rgba(0, 240, 255, 0.3);
}

.hud-bottom {
    position: absolute; bottom: 0; left: 0; right: 0;
    display: flex; align-items: flex-end; justify-content: space-between;
    padding: var(--gap-md) var(--gap-lg);
}

.hud-abilities {
    display: flex; gap: var(--gap-md);
}

.ability-slot {
    position: relative;
    width: 56px; height: 56px;
    background: var(--bg-panel);
    border: 1px solid var(--border-glow);
    border-radius: 6px;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    gap: 2px;
}

.ability-icon {
    font-size: 18px;
    color: var(--cyan);
}

.ability-cooldown {
    position: absolute; inset: 0;
    background: rgba(0, 0, 0, 0.7);
    border-radius: 5px;
    display: flex; align-items: center; justify-content: center;
    font-family: var(--font-mono);
    font-size: 14px;
    color: var(--white);
    opacity: 0;
    transition: opacity 0.15s;
}

.ability-cooldown.active { opacity: 1; }

.ability-key {
    font-family: var(--font-mono);
    font-size: 9px;
    letter-spacing: 0.1em;
    color: rgba(200, 220, 255, 0.4);
}

.hud-enemies {
    font-family: var(--font-mono);
    font-size: 13px;
    letter-spacing: 0.15em;
    color: rgba(200, 220, 255, 0.5);
}

.enemies-count {
    color: var(--red);
    font-weight: 700;
}

/* Crosshair */
.hud-crosshair {
    position: fixed;
    pointer-events: none;
    z-index: 999;
    transform: translate(-50%, -50%);
}

.crosshair-dot {
    width: 4px; height: 4px;
    background: var(--cyan);
    border-radius: 50%;
    box-shadow: 0 0 6px var(--cyan);
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
}

.crosshair-ring {
    width: 24px; height: 24px;
    border: 1.5px solid rgba(0, 240, 255, 0.5);
    border-radius: 50%;
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    transition: all 0.15s;
}

/* Hit marker */
.hud-hit-marker {
    position: fixed;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    font-size: 28px;
    font-weight: 900;
    color: var(--red);
    text-shadow: 0 0 10px var(--red);
    z-index: 998;
    pointer-events: none;
    animation: hit-pop 0.3s ease-out forwards;
}

/* Damage vignette */
.hud-damage-vignette {
    position: fixed; inset: 0;
    pointer-events: none;
    z-index: 60;
    box-shadow: inset 0 0 100px rgba(255, 0, 40, 0);
    transition: box-shadow 0.15s;
}

.hud-damage-vignette.active {
    box-shadow: inset 0 0 100px rgba(255, 0, 40, 0.4);
}

/* Wave announcement */
.wave-announcement {
    position: fixed;
    top: 30%; left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    z-index: 70;
    pointer-events: none;
    animation: wave-announce 2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.wave-announce-text {
    font-family: var(--font-display);
    font-size: clamp(36px, 6vw, 64px);
    font-weight: 900;
    letter-spacing: 0.15em;
    color: var(--cyan);
    text-shadow: 0 0 40px rgba(0, 240, 255, 0.5);
}

.wave-announce-sub {
    font-family: var(--font-mono);
    font-size: clamp(12px, 2vw, 18px);
    letter-spacing: 0.5em;
    color: var(--magenta);
    margin-top: var(--gap-sm);
}

/* ---- GAME OVER ---- */
.game-over-box { text-align: center; }

.game-over-title {
    font-size: clamp(28px, 4vw, 40px) !important;
    color: var(--red) !important;
    text-shadow: 0 0 30px rgba(255, 34, 68, 0.4) !important;
}

.game-over-stats {
    display: flex; flex-direction: column; gap: var(--gap-sm);
}

.stat-row {
    display: flex; justify-content: space-between;
    padding: var(--gap-sm) var(--gap-md);
    background: rgba(0, 240, 255, 0.03);
    border-radius: 4px;
}

.stat-label {
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.15em;
    color: rgba(200, 220, 255, 0.5);
}

.stat-value {
    font-family: var(--font-display);
    font-size: 18px;
    font-weight: 700;
    color: var(--gold);
}

/* ---- KEYFRAMES ---- */
@keyframes pulse-glow {
    0%, 100% { text-shadow: 0 0 30px rgba(0, 240, 255, 0.5), 0 0 60px rgba(0, 240, 255, 0.2); }
    50% { text-shadow: 0 0 50px rgba(0, 240, 255, 0.8), 0 0 100px rgba(0, 240, 255, 0.4); }
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

@keyframes fade-slide-up {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fade-scale-in {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

@keyframes hit-pop {
    0% { opacity: 1; transform: translate(-50%, -50%) scale(0.5); }
    50% { opacity: 1; transform: translate(-50%, -50%) scale(1.3); }
    100% { opacity: 0; transform: translate(-50%, -50%) scale(1); }
}

@keyframes wave-announce {
    0% { opacity: 0; transform: translate(-50%, -50%) scale(0.8); }
    15% { opacity: 1; transform: translate(-50%, -50%) scale(1.05); }
    25% { transform: translate(-50%, -50%) scale(1); }
    75% { opacity: 1; }
    100% { opacity: 0; transform: translate(-50%, -50%) translateY(-30px); }
}

@keyframes heartbeat {
    0%, 100% { transform: scale(1); }
    15% { transform: scale(1.15); }
    30% { transform: scale(1); }
}

@keyframes score-pop {
    0% { transform: scale(1); }
    50% { transform: scale(1.3); color: #fff; }
    100% { transform: scale(1); }
}

.score-pop { animation: score-pop 0.3s ease-out; }

/* ---- SCROLLBAR ---- */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--cyan-dim); border-radius: 2px; }