:root {
    --bg-dark: #0a0a10;
    --bg-panel: rgba(20, 20, 30, 0.85);
    --border-color: #2a2a3e;
    --accent-cyan: #00f3ff;
    --accent-orange: #ff9d00;
    --accent-green: #00ff66;
    --accent-yellow: #f2e000;
    --accent-red: #ff3333;
    --text-main: #e0e0ea;
    --text-muted: #80809a;
    --font-main: 'Rajdhani', sans-serif;
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.6);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    user-select: none;
}

body, html {
    width: 100%;
    height: 100%;
    background-color: var(--bg-dark);
    font-family: var(--font-main);
    color: var(--text-main);
    overflow: hidden;
    touch-action: none; /* Prevent scroll on mobile */
}

/* Typography Utilities */
.text-cyan { color: var(--accent-cyan); text-shadow: 0 0 5px rgba(0, 243, 255, 0.5); }
.text-orange { color: var(--accent-orange); text-shadow: 0 0 5px rgba(255, 157, 0, 0.5); }
.text-green { color: var(--accent-green); text-shadow: 0 0 5px rgba(0, 255, 102, 0.5); }
.text-yellow { color: var(--accent-yellow); text-shadow: 0 0 5px rgba(242, 224, 0, 0.5); }
.text-red { color: var(--accent-red); text-shadow: 0 0 5px rgba(255, 51, 51, 0.5); }
.text-accent { color: var(--accent-cyan); }
.text-gray { color: var(--text-muted); }
.text-small { font-size: 0.85rem; }
.text-center { text-align: center; }
.mt-20 { margin-top: 20px; }

/* Main Container */
#game-container {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: radial-gradient(circle at center, #1a1a24 0%, #0a0a10 100%);
}

#gameCanvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

/* Glassmorphism Panel Base */
.glass-panel {
    background: linear-gradient(135deg, rgba(30, 30, 40, 0.9), rgba(10, 10, 15, 0.95));
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid rgba(150, 150, 170, 0.2);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    box-shadow: 0 10px 40px 0 rgba(0, 0, 0, 0.8), inset 0 2px 10px rgba(255, 255, 255, 0.05);
}

/* Top HUD */
#top-hud {
    position: absolute;
    top: 15px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 15px;
    z-index: 10;
    pointer-events: none; /* Let clicks pass unless on actual box */
}

.hud-box {
    background: var(--bg-panel);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 8px 15px;
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: var(--glass-shadow);
    pointer-events: auto;
    position: relative;
    overflow: hidden;
}

.hud-box::before {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 2px;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
}

.hud-label {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.hud-value {
    font-size: 1.5rem;
    font-weight: 700;
}

.power-bar-container {
    width: 80px;
    height: 6px;
    background: #000;
    border-radius: 3px;
    margin: 5px 0;
    overflow: hidden;
    border: 1px solid #333;
}
.power-bar {
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, #ff9d00, #f2e000);
    box-shadow: 0 0 8px #f2e000;
    transition: width 0.3s ease;
}

.upgrade-box {
    cursor: pointer;
    background: linear-gradient(135deg, rgba(0, 243, 255, 0.1), rgba(0, 243, 255, 0.02));
    border-color: rgba(0, 243, 255, 0.3);
    transition: all 0.2s;
}
.upgrade-box:hover {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 15px rgba(0, 243, 255, 0.2);
}
.upgrade-box .icn {
    font-size: 1.2rem;
    margin-bottom: 2px;
}

/* Objective Panel */
#objective-panel {
    position: absolute;
    top: 90px;
    right: 20px;
    width: 250px;
    background: var(--bg-panel);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-left: 3px solid var(--accent-cyan);
    border-radius: 4px;
    padding: 12px;
    z-index: 10;
    box-shadow: var(--glass-shadow);
}
.panel-header {
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--text-muted);
    letter-spacing: 2px;
    margin-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 4px;
}
.obj-text {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
}
.progress-container {
    width: 100%;
    height: 8px;
    background: rgba(0,0,0,0.5);
    border-radius: 4px;
    overflow: hidden;
}
.progress-bar {
    width: 0%;
    height: 100%;
    background: var(--accent-cyan);
    box-shadow: 0 0 10px var(--accent-cyan);
    transition: width 0.3s;
}
.obj-stats {
    font-size: 0.8rem;
    text-align: right;
    margin-top: 4px;
    color: var(--text-muted);
}

/* Left Tools Panel */
#left-tools {
    position: absolute;
    top: 50%;
    left: 20px;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 10;
}
.tool-btn {
    width: 45px;
    height: 45px;
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    color: var(--text-muted);
    backdrop-filter: blur(5px);
    transition: all 0.2s;
    box-shadow: 0 4px 10px rgba(0,0,0,0.5);
}
.tool-btn svg {
    width: 24px;
    height: 24px;
}
.tool-btn:hover {
    background: rgba(40, 40, 60, 0.9);
    color: white;
}
.tool-btn.active {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
    box-shadow: 0 0 15px rgba(0, 243, 255, 0.3), inset 0 0 10px rgba(0, 243, 255, 0.1);
}
.tool-btn.danger.active {
    border-color: var(--accent-red);
    color: var(--accent-red);
    box-shadow: 0 0 15px rgba(255, 51, 51, 0.3), inset 0 0 10px rgba(255, 51, 51, 0.1);
}

/* Bottom Build Menu */
#build-menu {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-panel);
    backdrop-filter: blur(15px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 10px;
    width: 90%;
    max-width: 700px;
    z-index: 10;
    box-shadow: 0 10px 40px rgba(0,0,0,0.8);
}
.build-scroll {
    display: flex;
    overflow-x: auto;
    gap: 10px;
    padding-bottom: 5px;
    scrollbar-width: thin;
    scrollbar-color: var(--accent-cyan) var(--bg-dark);
}
.build-scroll::-webkit-scrollbar { height: 4px; }
.build-scroll::-webkit-scrollbar-track { background: var(--bg-dark); border-radius: 2px;}
.build-scroll::-webkit-scrollbar-thumb { background: var(--accent-cyan); border-radius: 2px; }

.build-item {
    min-width: 90px;
    padding: 8px;
    background: rgba(0,0,0,0.3);
    border: 1px solid #333;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
    transition: all 0.2s;
    user-select: none;
}
.build-item:hover {
    border-color: #555;
    background: rgba(255,255,255,0.05);
}
.build-item.selected {
    border-color: var(--accent-green);
    background: rgba(0, 255, 102, 0.1);
    box-shadow: 0 0 15px rgba(0, 255, 102, 0.2);
}
.build-icon {
    width: 40px;
    height: 40px;
    margin-bottom: 5px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    font-weight: bold;
    border-radius: 4px;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
}
/* Procedural UI Icons via Canvas/CSS will be injected or drawn, but let's add some CSS gradients */
.icon-conveyor { background: linear-gradient(45deg, #333 25%, #444 25%, #444 50%, #333 50%, #333 75%, #444 75%, #444 100%); background-size: 10px 10px; border: 2px solid #555; }
.icon-miner { background: #222; border: 2px solid currentColor; border-top: 4px solid currentColor; }
.icon-processor { background: radial-gradient(circle, #555 30%, #222 70%); border: 2px solid #00f3ff; border-radius: 50%; }
.icon-assembler { background: linear-gradient(135deg, #111, #444); border: 2px solid #00ff66; position: relative; }
.icon-assembler::after { content:''; position: absolute; width:10px; height:10px; background:#00ff66; border-radius:50%; box-shadow:0 0 5px #00ff66;}
.icon-generator { background: repeating-linear-gradient(90deg, #112 0px, #112 4px, #448 4px, #448 8px); border: 2px solid #00f3ff; }

.build-name {
    font-size: 0.75rem;
    font-weight: 700;
    text-align: center;
}
.build-cost {
    font-size: 0.65rem;
    color: var(--text-muted);
    margin-top: 3px;
    text-align: center;
}

/* Inspector Panel */
#inspector-panel {
    position: absolute;
    bottom: 120px;
    right: 20px;
    width: 220px;
    background: var(--bg-panel);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    z-index: 10;
    box-shadow: var(--glass-shadow);
    pointer-events: none;
    transition: opacity 0.3s;
}
.ins-title {
    font-size: 1.1rem;
    color: var(--accent-cyan);
    font-weight: 700;
    margin-bottom: 10px;
    text-transform: uppercase;
}
.ins-stat {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    margin-bottom: 5px;
    border-bottom: 1px dotted rgba(255,255,255,0.1);
    padding-bottom: 2px;
}
.ins-text {
    font-size: 0.85rem;
    margin-top: 10px;
}

/* Modals */
.modal {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.7);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
}
.modal.hidden { display: none; }
.modal-content {
    background: linear-gradient(180deg, #1a1a24, #0a0a10);
    border: 1px solid var(--accent-cyan);
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    padding: 25px;
    box-shadow: 0 0 30px rgba(0, 243, 255, 0.2), inset 0 0 20px rgba(0,0,0,0.8);
    position: relative;
}
.modal-header {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--accent-cyan);
    border-bottom: 1px solid rgba(0, 243, 255, 0.3);
    padding-bottom: 10px;
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.close-btn {
    cursor: pointer;
    color: var(--text-muted);
    font-size: 1rem;
}
.close-btn:hover { color: white; }

.upgrades-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}
.upgrade-card {
    display: flex;
    background: rgba(0,0,0,0.4);
    border: 1px solid #333;
    border-radius: 8px;
    padding: 12px;
    align-items: center;
    gap: 15px;
}
.upg-icon {
    font-size: 2rem;
    width: 50px;
    text-align: center;
}
.upg-info { flex: 1; }
.upg-title { font-weight: 700; font-size: 1.1rem; color: #fff; }
.upg-desc { font-size: 0.8rem; color: var(--text-muted); margin-top: 4px; line-height: 1.3; }
.upg-action { display: flex; flex-direction: column; align-items: flex-end; gap: 5px; }
.upg-cost { font-size: 0.75rem; color: var(--accent-orange); font-weight: 600; }
.btn-buy {
    background: rgba(0, 243, 255, 0.1);
    color: var(--accent-cyan);
    border: 1px solid var(--accent-cyan);
    padding: 5px 15px;
    border-radius: 4px;
    font-family: inherit;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
}
.btn-buy:hover { background: var(--accent-cyan); color: #000; box-shadow: 0 0 10px var(--accent-cyan); }
.btn-buy:disabled { opacity: 0.5; cursor: not-allowed; border-color: #555; color: #888; background: transparent; box-shadow: none; }

/* Level Complete */
.level-glowing-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-green);
    text-shadow: 0 0 15px rgba(0, 255, 102, 0.8);
    margin-bottom: 20px;
}
.level-stats { font-size: 1.2rem; line-height: 1.6; color: #ddd; }

/* Tutorial Screen */
#screen-tutorial {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    z-index: 200;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #000;
}
.intro-bg {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: 
        linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.9)),
        url('../assets/images/thumbnail.png') center/cover no-repeat;
    z-index: 1;
}
.intro-content {
    position: relative;
    z-index: 2;
    background: var(--bg-panel);
    backdrop-filter: blur(15px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 40px;
    max-width: 800px;
    width: 90%;
    box-shadow: 0 20px 50px rgba(0,0,0,0.8), inset 0 0 30px rgba(0,243,255,0.1);
    text-align: center;
}
.logo-box {
    margin-bottom: 30px;
    perspective: 1000px;
}
.app-icon-logo {
    width: 120px; height: 120px;
    border-radius: 20px;
    margin: 0 auto 15px auto;
    display: block;
    box-shadow: 0 0 30px rgba(0,243,255,0.6), inset 0 0 20px rgba(255,255,255,0.4);
    border: 2px solid rgba(0,243,255,0.4);
    animation: pulseIcon 4s infinite ease-in-out;
}
@keyframes pulseIcon { 0%, 100% { transform: scale(1); box-shadow: 0 0 30px rgba(0,243,255,0.6); } 50% { transform: scale(1.05); box-shadow: 0 0 50px rgba(0,243,255,0.9); } }
.logo-text {
    font-size: 2.8rem;
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: 2px;
    text-shadow: 0 5px 15px rgba(0,0,0,0.8);
}
@keyframes rotateLogo { 100% { transform: rotate(360deg); } }
@keyframes rotateLogoRev { 100% { transform: rotate(-360deg); } }

.tutorial-grid {
    display: flex;
    gap: 20px;
    margin-bottom: 30px;
    text-align: left;
}
.tut-card {
    flex: 1;
    background: rgba(0,0,0,0.5);
    border: 1px solid #333;
    padding: 20px;
    border-radius: 8px;
    transition: transform 0.3s;
}
.tut-card:hover { transform: translateY(-5px); border-color: #555; background: rgba(255,255,255,0.02);}
.tut-icon { font-size: 2rem; margin-bottom: 10px; }
.tut-card h3 { margin-bottom: 8px; font-size: 1.1rem; }
.tut-card p { font-size: 0.9rem; color: var(--text-muted); line-height: 1.4; }

.sound-toggle-box {
    margin-bottom: 25px;
    font-size: 1rem;
    color: #ddd;
}
.sound-toggle-box label { cursor: pointer; display: flex; align-items: center; justify-content: center; gap: 10px; }
.custom-checkbox {
    width: 20px; height: 20px;
    border: 2px solid var(--accent-cyan);
    border-radius: 4px;
    display: inline-block;
    position: relative;
}
input[type="checkbox"] { display: none; }
input[type="checkbox"]:checked + .custom-checkbox::after {
    content: '✔';
    position: absolute; top: -2px; left: 2px;
    color: var(--accent-cyan);
    font-weight: bold;
}

.btn-main {
    background: linear-gradient(90deg, #00f3ff, #0088ff);
    color: #000;
    border: none;
    padding: 15px 40px;
    font-size: 1.2rem;
    font-family: inherit;
    font-weight: 700;
    border-radius: 30px;
    cursor: pointer;
    letter-spacing: 1px;
    box-shadow: 0 0 20px rgba(0, 243, 255, 0.4);
    transition: all 0.3s;
}
.btn-main:hover {
    box-shadow: 0 0 30px rgba(0, 243, 255, 0.8);
    transform: scale(1.05);
}

/* Utilities */
.hidden { display: none !important; }

/* Responsive adjustments */
@media (max-width: 768px) {
    #top-hud { width: 98%; flex-wrap: wrap; justify-content: center; gap: 5px; top: 10px; }
    .hud-box { padding: 5px 8px; border-radius: 4px; }
    .hud-label { font-size: 0.55rem; }
    .hud-value { font-size: 1rem; }
    .power-bar-container { width: 60px; }
    #objective-panel { top: auto; bottom: 140px; right: 10px; width: 160px; padding: 6px; box-shadow: 0 5px 15px rgba(0,0,0,0.9); pointer-events: none; }
    .obj-text { font-size: 0.8rem; }
    .tutorial-grid { flex-direction: column; gap: 10px; }
    .tut-card { padding: 10px; }
    .logo-text { font-size: 1.8rem; }
    #left-tools { top: auto; bottom: 85px; left: 50%; transform: translateX(-50%); flex-direction: row; gap: 15px; }
    .tool-btn { width: 45px; height: 45px; box-shadow: 0 5px 15px rgba(0,0,0,0.8); }
    #build-menu { width: 98%; bottom: 10px; padding: 8px; border-radius: 10px; }
    .build-item { min-width: 80px; padding: 6px; }
    .build-icon { width: 32px; height: 32px; }
    .build-name { font-size: 0.7rem; }
    .build-cost { font-size: 0.6rem; }
    .modal-content { padding: 15px; width: 95%; }
    .upg-icon { width: 30px; font-size: 1.5rem; }
    .upg-title { font-size: 0.9rem; }
    .btn-main { padding: 10px 25px; font-size: 1rem; }
}