:root {
    --bg-color: #050505;
    --primary-neon: #00f3ff; /* Cyan */
    --secondary-neon: #ff00ff; /* Magenta */
    --accent-neon: #39ff14; /* Lime */
    --text-color: #ffffff;
    --glass-bg: rgba(20, 20, 20, 0.7);
    --glass-border: rgba(255, 255, 255, 0.15);
    --glow-shadow: 0 0 15px rgba(0, 243, 255, 0.4);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', sans-serif;
    user-select: none;
}

body, html {
    width: 100%;
    height: 100%;
    background-color: var(--bg-color);
    overflow: hidden;
    color: var(--text-color);
}

#game-container {
    position: relative;
    width: 100vw;
    height: 100vh;
}

#game-canvas {
    display: block;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, #101010 0%, #050505 100%);
}
/* HUD / Stats */
#hud {
    position: absolute;
    top: 20px;
    left: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    pointer-events: none;
}

.stat-card {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    padding: 12px 20px;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    min-width: 180px;
    box-shadow: var(--glow-shadow);
    pointer-events: auto; /* Enable clicks */
}

.stat-card .label {
    font-size: 0.7rem;
    letter-spacing: 2px;
    opacity: 0.6;
    margin-bottom: 4px;
}

.stat-card .value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-neon);
    text-shadow: 0 0 10px rgba(0, 243, 255, 0.5);
}

/* Upgrade Menu */
#menu-toggle {
    position: absolute;
    bottom: 30px;
    right: 30px;
    padding: 15px 30px;
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 2px;
    cursor: pointer;
    z-index: 10;
}

#upgrade-menu, #achievements-menu {
    position: absolute;
    top: 50%;
    right: 30px;
    transform: translateY(-50%) translateX(120%); /* Hide off-screen */
    width: 350px;
    height: 80vh;
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    display: flex;
    flex-direction: column;
    box-shadow: 0 0 40px rgba(0, 0, 0, 0.5);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 100;
    opacity: 0;
    pointer-events: none;
}

#upgrade-menu.active, #achievements-menu.active {
    transform: translateY(-50%) translateX(0);
    opacity: 1;
    pointer-events: auto;
}

.menu-header {
    padding: 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--glass-border);
}

.menu-header h2 {
    font-size: 1.2rem;
    letter-spacing: 3px;
    color: var(--secondary-neon);
}

#close-menu {
    background: none;
    border: none;
    color: white;
    font-size: 2rem;
    cursor: pointer;
    line-height: 1;
}

#upgrade-list {
    flex-grow: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* Upgrade Cards */
.upgrade-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    padding: 15px;
    border-radius: 12px;
    cursor: pointer;
    transition: 0.2s;
}

.upgrade-card:hover:not(.disabled) {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--primary-neon);
}

.upgrade-card.disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.upgrade-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
}

.upgrade-name {
    font-weight: 700;
    font-size: 0.95rem;
}

.upgrade-cost {
    font-weight: 700;
    color: var(--accent-neon);
}

.upgrade-desc {
    font-size: 0.8rem;
    opacity: 0.7;
}

/* Buttons */
.glass-btn {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    color: white;
    border-radius: 50px;
    box-shadow: var(--glow-shadow);
    transition: 0.3s;
}

.glass-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 25px rgba(0, 243, 255, 0.6);
    border-color: var(--primary-neon);
}

.glass-btn:active {
    transform: translateY(0px);
}

/* Shop Tabs */
.shop-tabs {
    display: flex;
    padding: 0 20px;
    gap: 10px;
    margin-bottom: 10px;
}

.tab-btn {
    flex: 1;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    color: white;
    padding: 8px;
    border-radius: 8px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: 0.3s;
}

.tab-btn.active {
    background: var(--primary-neon);
    color: black;
    font-weight: 700;
}

/* Shredder Zone */
#shredder-zone {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 150px;
    background: linear-gradient(to top, rgba(255, 0, 0, 0.2), transparent);
    border-top: 2px dashed rgba(255, 0, 0, 0.5);
    pointer-events: none;
    display: none;
    align-items: center;
    justify-content: center;
    color: rgba(255, 0, 0, 0.5);
    font-weight: 900;
    letter-spacing: 10px;
}

#shredder-zone.visible {
    display: flex;
}

/* Achievements Style */
#achievements-list {
    flex-grow: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.achievement-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    padding: 12px;
    border-radius: 12px;
    transition: 0.3s;
}

.achievement-card.unlocked {
    border-color: var(--accent-neon);
    background: rgba(57, 255, 20, 0.05);
}

.achievement-card.locked {
    opacity: 0.6;
    filter: grayscale(1);
}

.ach-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 5px;
}

.ach-name {
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--primary-neon);
}

.ach-desc {
    font-size: 0.75rem;
    opacity: 0.7;
}

/* Achievement Notification */
.achievement-notification {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    pointer-events: none;
    animation: slideInNotify 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes slideInNotify {
    from { transform: translateX(120%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* Scrollbar */
#achievements-list::-webkit-scrollbar {
    width: 6px;
}
#achievements-list::-webkit-scrollbar-thumb {
    background: var(--glass-border);
    border-radius: 10px;
}