:root {
    --bg-ice: #e0f7fa;
    --text-primary: #006064;
    --btn-primary: #00bcd4;
    --btn-hover: #00acc1;
    --btn-shadow: #00838f;
    --penguin-size: clamp(50px, 9vmin, 90px);
    --fish-size: clamp(40px, 7.5vmin, 70px);
    --snowball-size: clamp(45px, 8.5vmin, 80px);
}

*, *::before, *::after { box-sizing: border-box; }

body, html {
    margin: 0; padding: 0;
    width: 100%; height: 100%;
    overflow: hidden;
    font-family: 'Nunito', sans-serif;
    color: var(--text-primary);
    user-select: none;
    -webkit-user-select: none;
    -webkit-tap-highlight-color: transparent;
    touch-action: none;
    background-color: var(--bg-ice);
}

#app { width: 100vw; height: 100vh; position: relative; }

/* ========== ENVIRONMENT ========== */
#bg-layer {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background-color: #4fc3f7;
    z-index: 0;
    transition: background-color 1.5s ease-in-out;
    overflow: hidden;
}

/* Water ripples */
.water-ripple {
    position: absolute;
    border-radius: 50%;
    border: 2px solid rgba(255,255,255,0.3);
    animation: rippleOut 3s ease-out forwards;
    pointer-events: none;
}
@keyframes rippleOut {
    0%   { width: 0; height: 0; opacity: 0.7; transform: translate(-50%,-50%); }
    100% { width: 200px; height: 200px; opacity: 0; transform: translate(-50%,-50%); }
}

.ice-floe {
    position: absolute;
    background: #eaf6fc;
    box-shadow: inset -8px -16px 24px rgba(0,100,150,0.12), 0 8px 18px rgba(0,0,0,0.09);
    transition: all 1.5s ease-in-out;
    opacity: 0.92;
}
.flex-1 { width: 50vw; height: 40vh; top: -10vh; left: -10vw; border-radius: 40% 60% 70% 30%/40% 50% 60% 50%; animation: floeDrift1 18s ease-in-out infinite alternate; }
.flex-2 { width: 60vw; height: 50vh; bottom: -15vh; right: -10vw; border-radius: 60% 40% 30% 70%/50% 40% 50% 60%; animation: floeDrift2 22s ease-in-out infinite alternate; }
.flex-3 { width: 25vw; height: 25vh; top: 20vh; right: 10vw; border-radius: 30% 70% 70% 30%/30% 30% 70% 70%; animation: floeDrift1 14s ease-in-out infinite alternate-reverse; }
.flex-4 { width: 30vw; height: 20vh; bottom: 20vh; left: 5vw; border-radius: 70% 30% 30% 70%/50% 50% 50% 50%; animation: floeDrift2 16s ease-in-out infinite alternate; }

@keyframes floeDrift1 {
    0%   { transform: translate(0px, 0px) rotate(0deg); }
    100% { transform: translate(12px, 8px) rotate(1.5deg); }
}
@keyframes floeDrift2 {
    0%   { transform: translate(0px, 0px) rotate(0deg); }
    100% { transform: translate(-10px, 6px) rotate(-1.2deg); }
}

/* ========== ZOMBIE THEME ========== */
.zombie-gear { display: none; }

body.zombie-theme #bg-layer { background-color: #0d1a1f; }
body.zombie-theme .ice-floe {
    background: #1a2a35;
    box-shadow: inset -8px -16px 24px rgba(0,0,0,0.6), 0 8px 18px rgba(0,0,0,0.5);
    filter: sepia(0.4) saturate(1.6) hue-rotate(60deg) brightness(0.55);
}
body.zombie-theme .zombie-gear { display: block; }

/* ========== SCREENS ========== */
.screen {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    display: none; flex-direction: column;
    justify-content: center; align-items: center; text-align: center;
    z-index: 10;
}
.screen.active { display: flex; }

#main-menu, #game-over-screen {
    background: rgba(200,240,250,0.35);
    backdrop-filter: blur(12px);
}
body.zombie-theme #main-menu,
body.zombie-theme #game-over-screen {
    background: rgba(10,20,15,0.55);
}

/* ========== MENU / GAME OVER BOXES ========== */
.menu-content, .game-over-content {
    background: rgba(255,255,255,0.9);
    padding: clamp(18px, 4vw, 38px);
    border-radius: 28px;
    box-shadow: 0 12px 40px rgba(0,100,150,0.18);
    border: 3px solid rgba(255,255,255,1);
    animation: floatMenu 4s ease-in-out infinite alternate;
    width: clamp(280px, 88vw, 480px);
    max-height: 93vh;
    overflow-y: auto;
}
body.zombie-theme .menu-content,
body.zombie-theme .game-over-content {
    background: rgba(15,30,20,0.92);
    border-color: #2d6a2d;
    color: #b8f0b8;
}
@keyframes floatMenu {
    0%   { transform: translateY(-5px); }
    100% { transform: translateY(5px); }
}

.hero-svg {
    width: clamp(75px, 18vmin, 140px);
    height: clamp(75px, 18vmin, 140px);
    animation: bounce 1s infinite alternate;
}
h1, h2 {
    font-weight: 900; text-transform: uppercase;
    text-shadow: 2px 2px 0 white;
    margin-bottom: 12px; color: #00838f;
}
body.zombie-theme h1, body.zombie-theme h2 { color: #4caf50; text-shadow: 0 0 10px rgba(76,175,80,0.5); }
h1 { font-size: clamp(1.5rem, 5.5vw, 3.2rem); line-height: 1.1; margin-top: 8px; }
h2 { font-size: clamp(1.3rem, 4vw, 2.8rem); }
.menu-content p { font-size: clamp(0.82rem, 2.4vw, 1.25rem); font-weight: 700; margin-bottom: 18px; }

/* Player name input */
.name-input-wrap {
    margin: 0 0 12px;
    text-align: center;
}
.name-input-wrap label {
    display: block;
    font-size: clamp(0.75rem, 2vw, 0.95rem);
    font-weight: 700;
    color: #00838f;
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
body.zombie-theme .name-input-wrap label { color: #66bb6a; }
#player-name-input {
    width: 100%;
    max-width: 240px;
    padding: 10px 18px;
    border-radius: 30px;
    border: 3px solid #b2ebf2;
    background: rgba(255,255,255,0.9);
    font-family: 'Nunito', sans-serif;
    font-size: clamp(1rem, 3vw, 1.2rem);
    font-weight: 700;
    color: #006064;
    outline: none;
    text-align: center;
    box-shadow: 0 3px 12px rgba(0,150,200,0.12);
    transition: border-color 0.2s, box-shadow 0.2s;
}
#player-name-input:focus {
    border-color: #00bcd4;
    box-shadow: 0 3px 20px rgba(0,188,212,0.3);
}
body.zombie-theme #player-name-input {
    background: rgba(15,35,15,0.9);
    border-color: #2e7d32;
    color: #a5d6a7;
}

/* Stats */
.stats-box {
    text-align: left; background: #e0f7fa;
    padding: 14px; border-radius: 14px; margin-bottom: 14px;
}
body.zombie-theme .stats-box { background: #0d2010; }
.stat-item {
    display: flex; justify-content: space-between;
    font-size: clamp(0.82rem, 2.2vw, 1.15rem);
    margin: 7px 0; border-bottom: 2px dashed #b2ebf2; padding-bottom: 4px;
}
body.zombie-theme .stat-item { border-bottom-color: #1b5e20; }
.stat-item.highlight { font-size: clamp(0.95rem, 2.8vw, 1.45rem); color: #ff9800; border-bottom: none; font-weight: 900; margin-top: 14px; }
.strong { font-weight: 900; color: #00838f; }
body.zombie-theme .strong { color: #66bb6a; }

/* Leaderboard */
.leaderboard-box {
    background: linear-gradient(135deg, #e0f7fa, #b2ebf2);
    border-radius: 14px; padding: 12px 14px; margin-bottom: 14px;
    border: 2px solid rgba(0,150,200,0.2);
}
body.zombie-theme .leaderboard-box {
    background: linear-gradient(135deg, #0a1f0a, #0d2a0d);
    border-color: rgba(76,175,80,0.3);
}
.leaderboard-box h3 { margin: 0 0 10px; font-size: clamp(0.9rem, 2.5vw, 1.2rem); color: #006064; }
body.zombie-theme .leaderboard-box h3 { color: #4caf50; }
#leaderboard-list {
    margin: 0; padding-left: 20px; text-align: left;
}
#leaderboard-list li {
    font-size: clamp(0.78rem, 2vw, 1rem);
    font-weight: 700; padding: 3px 0;
    color: #004d40;
}
body.zombie-theme #leaderboard-list li { color: #a5d6a7; }
#leaderboard-list li:first-child { color: #ff6f00; font-size: clamp(0.9rem, 2.3vw, 1.1rem); }
#leaderboard-list li.new-record { color: #ff1744; animation: pulse 0.8s infinite alternate; }
@keyframes pulse { from { opacity: 1; } to { opacity: 0.5; } }

/* ========== BUTTONS ========== */
button {
    background-color: var(--btn-primary); color: white; border: none;
    padding: clamp(10px,2vw,14px) clamp(20px,4vw,38px);
    font-size: clamp(0.95rem, 2.8vw, 1.7rem);
    font-weight: 900; font-family: 'Nunito', sans-serif;
    border-radius: 50px; cursor: pointer;
    box-shadow: 0 6px 0 var(--btn-shadow), 0 12px 15px rgba(0,0,0,0.1);
    transition: all 0.15s; text-transform: uppercase;
    touch-action: manipulation;
}
button:hover { background-color: var(--btn-hover); transform: translateY(2px); box-shadow: 0 4px 0 var(--btn-shadow), 0 8px 10px rgba(0,0,0,0.1); }
button:active { transform: translateY(6px); box-shadow: 0 0 0 var(--btn-shadow), 0 2px 5px rgba(0,0,0,0.1); }

/* ========== HUD (3 bubbles) ========== */
#game-area {
    width: 100%; height: 100%; position: relative; overflow: hidden; cursor: crosshair;
    perspective: 1200px; transform-style: preserve-3d; z-index: 5;
}
#hud {
    position: absolute; top: 0; left: 0; width: 100%;
    display: flex; align-items: center;
    justify-content: space-between;
    z-index: 10; pointer-events: auto;
    padding: clamp(7px,1.8vh,14px) clamp(10px,2.5vw,20px);
    box-sizing: border-box;
    gap: 8px;
    background: linear-gradient(to bottom, rgba(255,255,255,0.75) 0%, rgba(255,255,255,0) 100%);
    transition: background 0.5s;
}
body.zombie-theme #hud {
    background: linear-gradient(to bottom, rgba(0,15,5,0.78) 0%, rgba(0,0,0,0) 100%);
}

.hud-bubble {
    display: flex; align-items: center; gap: 6px;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(8px);
    border: 2px solid rgba(255,255,255,0.9);
    border-radius: 30px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.09);
    font-weight: 900;
    white-space: nowrap;
    transition: background 0.5s, border-color 0.5s;
}
body.zombie-theme .hud-bubble {
    background: rgba(10,25,10,0.85);
    border-color: rgba(76,175,80,0.5);
}

.hud-left {
    font-size: clamp(0.72rem, 2.2vw, 1.1rem);
    color: #006064;
    padding: clamp(5px,1.3vh,9px) clamp(10px,2vw,18px);
}
body.zombie-theme .hud-left { color: #a5d6a7; }
.hud-icon { font-size: clamp(0.85rem, 2.5vw, 1.3rem); }
.hud-sep {
    width: 1px; height: 18px;
    background: rgba(0,96,100,0.22);
    margin: 0 4px;
}
body.zombie-theme .hud-sep { background: rgba(76,175,80,0.35); }

.hud-center {
    padding: clamp(5px,1.3vh,9px) clamp(12px,2.2vw,20px);
    font-size: clamp(1rem, 3.2vw, 1.6rem);
    letter-spacing: 1px;
    flex-shrink: 0;
}

.hud-right {
    padding: clamp(4px,1vh,7px) clamp(8px,1.8vw,14px);
    gap: 4px;
    flex-shrink: 0;
}
.hud-btn {
    background: none; border: none; outline: none;
    font-size: clamp(1.1rem, 3.5vw, 1.8rem);
    cursor: pointer; padding: 4px 6px; border-radius: 12px;
    transition: background 0.15s, transform 0.1s;
    box-shadow: none !important;
    line-height: 1;
}
.hud-btn:hover, .hud-btn:focus { background: rgba(0,0,0,0.08); }
.hud-btn:active { transform: scale(0.88); }
.hud-btn.zombie-on { background: rgba(244,67,54,0.18); border-radius: 12px; }
.hud-btn.paused    { background: rgba(255,152,0,0.18); border-radius: 12px; }
.hud-divider {
    width: 1px; height: clamp(18px, 3.5vw, 26px);
    background: rgba(0,0,0,0.12); margin: 0 2px;
}
body.zombie-theme .hud-divider { background: rgba(76,175,80,0.3); }

/* Weapon cooldown bar (bottom of screen) */
#weapon-bar {
    position: absolute; bottom: 0; left: 0; right: 0;
    height: 5px; z-index: 15; pointer-events: none;
    display: none;
}
#weapon-bar-fill {
    height: 100%; width: 100%;
    background: linear-gradient(90deg, #f44336, #ff9800, #4caf50);
    transform-origin: left;
    transform: scaleX(1);
    transition: transform 0.05s linear;
    border-radius: 0 3px 3px 0;
}
.zombie-mode-active #weapon-bar { display: block; }

/* ========== ENTITIES ========== */
#player-penguin {
    position: absolute;
    width: var(--penguin-size); height: var(--penguin-size);
    top: 50%; left: 50%; transform: translate(-50%, -50%);
    pointer-events: none; z-index: 3; transition: transform 0.05s linear;
}
.svg-penguin, .svg-fish { width: 100%; height: 100%; }
#player-penguin .svg-penguin { filter: drop-shadow(0 6px 4px rgba(0,100,100,0.18)); }

.fish {
    position: absolute;
    width: var(--fish-size); height: var(--fish-size);
    transform: translate(-50%, -50%);
    animation: bounce 1s ease-in-out infinite alternate;
    z-index: 2;
    filter: drop-shadow(0 5px 4px rgba(0,100,100,0.15));
}
.fish.rare  { filter: hue-rotate(150deg) drop-shadow(0 5px 4px rgba(0,100,100,0.15)); width: calc(var(--fish-size)*.85); height: calc(var(--fish-size)*.85); }
.fish.epic  { filter: hue-rotate(250deg) drop-shadow(0 5px 4px rgba(0,100,100,0.15)); width: calc(var(--fish-size)*.72); height: calc(var(--fish-size)*.72); }
.fish.fading { animation: blink 0.25s infinite; }
@keyframes blink { 0%{opacity:1;} 100%{opacity:0.25;} }

.snowball {
    position: absolute;
    width: var(--snowball-size); height: var(--snowball-size);
    background: radial-gradient(circle at 30% 30%, #fff 20%, #d0e8f0 80%);
    border-radius: 50%; box-shadow: 0 4px 12px rgba(0,0,0,0.2); z-index: 4;
}
.snowball.red { background: radial-gradient(circle at 30% 30%, #ff8a80 20%, #c62828 80%); }
.snowball.zombie-item {
    background: transparent; box-shadow: none; border-radius: 0;
    /* Smaller and scarier — 78% of normal snowball size */
    width: calc(var(--snowball-size) * 0.78);
    height: calc(var(--snowball-size) * 0.78);
}

/* Bullet (zombie weapon) */
.bullet {
    position: absolute; width: 16px; height: 8px;
    background: linear-gradient(90deg, #ff6f00, #ffca28);
    border-radius: 4px;
    box-shadow: 0 0 8px #ff9800;
    z-index: 15; pointer-events: none;
    transform: translate(-50%, -50%);
}

.explosion {
    position: absolute; width: 70px; height: 70px; border-radius: 50%;
    background-color: #ff9800; border: 4px solid #ff4d4d;
    transform: translate(-50%, -50%) scale(0.2);
    pointer-events: none; z-index: 50; animation: explodeAnim 0.4s ease-out forwards;
}
@keyframes explodeAnim {
    0%   { transform: translate(-50%,-50%) scale(0.2); opacity: 1; }
    100% { transform: translate(-50%,-50%) scale(2.5); opacity: 0; }
}
.zombie-explosion {
    position: absolute; width: 80px; height: 80px;
    border-radius: 50%;
    background: radial-gradient(circle, #4caf50 20%, #1b5e20 70%);
    border: 4px solid #8bc34a;
    transform: translate(-50%,-50%) scale(0.2);
    pointer-events: none; z-index: 50; animation: explodeAnim 0.45s ease-out forwards;
}

/* ========== BLUE PENGUIN / KISS ========== */
.blue-penguin-wrap {
    position: absolute;
    width: var(--penguin-size); height: var(--penguin-size);
    animation: bounce 1.2s ease-in-out infinite alternate; z-index: 3;
    filter: drop-shadow(0 6px 4px rgba(0,100,100,0.15));
}
.kissing-animation { transition: all 1.2s cubic-bezier(0.34,1.56,0.64,1) !important; }
.kissing-rotate-left  { transform: translate(-50%,-50%) translateZ(400px) rotateY(20deg)  rotateZ(15deg)  !important; filter: drop-shadow(20px 20px 20px rgba(0,0,0,.3)); }
.kissing-rotate-right { transform: translate(-50%,-50%) translateZ(400px) rotateY(-20deg) rotateZ(-15deg) !important; filter: drop-shadow(-20px 20px 20px rgba(0,0,0,.3)); }

.kiss-heart {
    position: absolute; font-size: clamp(35px, 8vmin, 60px);
    pointer-events: none; z-index: 60;
    transform: translate(-50%,-50%) scale(0);
    animation: heartPop 1.5s ease-out forwards;
}
@keyframes heartPop {
    0%  { transform: translate(-50%,-50%) scale(0);   opacity: 1; }
    10% { transform: translate(-50%,-50%) scale(1.5); }
    80% { transform: translate(-50%,-100%) scale(1.5); opacity: 1; }
    100%{ transform: translate(-50%,-155%) scale(1);  opacity: 0; }
}

/* ========== MOBILE JOYSTICK ========== */
.mobile-only { display: none; }
#joystick-zone {
    position: absolute;
    bottom: clamp(20px,5vh,50px); left: 50%; transform: translateX(-50%);
    z-index: 20; pointer-events: auto; touch-action: none;
}
#joystick-base {
    width: clamp(100px,25vmin,140px); height: clamp(100px,25vmin,140px);
    border-radius: 50%;
    background: rgba(255,255,255,0.22);
    border: 3px solid rgba(255,255,255,0.45);
    backdrop-filter: blur(4px);
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 4px 20px rgba(0,0,0,0.18);
}
#joystick-knob {
    width: clamp(40px,10vmin,55px); height: clamp(40px,10vmin,55px);
    border-radius: 50%;
    background: rgba(255,255,255,0.85);
    box-shadow: 0 3px 10px rgba(0,0,0,0.22);
    transition: transform 0.05s linear; pointer-events: none;
}
body.zombie-theme #joystick-base { background: rgba(20,40,20,.4); border-color: rgba(76,175,80,.5); }
body.zombie-theme #joystick-knob { background: rgba(76,175,80,.85); }

/* Shoot button (zombie mode) */
#shoot-btn {
    position: absolute;
    bottom: clamp(20px,5vh,50px); right: clamp(20px,5vw,50px);
    width: clamp(60px,14vmin,80px); height: clamp(60px,14vmin,80px);
    border-radius: 50%;
    background: radial-gradient(circle at 35% 35%, #f44336, #b71c1c);
    border: 3px solid rgba(255,100,100,0.6);
    box-shadow: 0 6px 20px rgba(244,67,54,0.5), 0 0 20px rgba(244,67,54,0.3);
    font-size: clamp(1.4rem,5vmin,2rem);
    display: none; align-items: center; justify-content: center;
    cursor: pointer; z-index: 21; pointer-events: auto; touch-action: manipulation;
    transition: transform 0.1s, box-shadow 0.1s;
    animation: pulseShoot 1.5s infinite;
}
#shoot-btn:active { transform: scale(0.88); box-shadow: 0 2px 8px rgba(244,67,54,0.5); }
@keyframes pulseShoot {
    0%,100% { box-shadow: 0 6px 20px rgba(244,67,54,.5), 0 0 20px rgba(244,67,54,.3); }
    50%      { box-shadow: 0 6px 30px rgba(244,67,54,.8), 0 0 35px rgba(244,67,54,.6); }
}
.zombie-mode-active #shoot-btn { display: flex; }

/* ========== OVERLAYS ========== */
.overlay {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(255,255,255,0.7); backdrop-filter: blur(5px);
    display: flex; justify-content: center; align-items: center;
    z-index: 20; opacity: 1; transition: opacity 0.5s;
}
.overlay h2 { font-size: clamp(2rem,7vw,4rem); color: #ff9800; animation: popIn 0.5s cubic-bezier(0.175,.885,.32,1.275); }
.overlay.hidden { opacity: 0; pointer-events: none; }
@keyframes popIn { 0%{transform:scale(.5);opacity:0;} 100%{transform:scale(1);opacity:1;} }

/* ========== SHARED ANIMATIONS ========== */
@keyframes bounce {
    from { transform: translateY(0); }
    to   { transform: translateY(-8px); }
}

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
    :root { --penguin-size: clamp(44px,10.5vmin,70px); --fish-size: clamp(36px,9.5vmin,60px); --snowball-size: clamp(38px,10vmin,64px); }
    .mobile-only { display: block; }
    #game-area { cursor: default; }
    .menu-content, .game-over-content { width: 92vw; padding: 18px; }
    .hud-left { font-size: clamp(0.65rem,2vw,1rem); padding: 5px 10px; }
    .hud-center { font-size: clamp(0.9rem,3vw,1.4rem); padding: 5px 12px; }
}
@media (max-width: 480px) {
    :root { --penguin-size: clamp(40px,12vmin,60px); --fish-size: clamp(33px,11vmin,52px); --snowball-size: clamp(36px,12vmin,56px); }
    h1 { font-size: clamp(1.25rem,6vw,2rem); }
    h2 { font-size: clamp(1.05rem,5vw,1.55rem); }
    #hud { padding: 5px 8px; gap: 5px; }
    .hud-left { font-size: 0.65rem; padding: 4px 8px; gap: 4px; }
    .hud-center { font-size: 0.95rem; padding: 4px 10px; letter-spacing: 0; }
    .hud-btn { font-size: 1.1rem; padding: 3px 5px; }
    .hud-right { padding: 4px 8px; }
}
@media (max-width: 900px) and (orientation: landscape) {
    :root { --penguin-size: clamp(34px,8.5vh,54px); --fish-size: clamp(28px,7.5vh,48px); --snowball-size: clamp(30px,8.5vh,52px); }
    .menu-content, .game-over-content { width: 68vw; padding: 14px 22px; max-height: 90vh; }
    h1 { font-size: clamp(1rem,4vh,1.9rem); }
    #joystick-zone { bottom: 10px; left: 12%; transform: none; }
    #shoot-btn { bottom: 10px; right: 10%; }
    #joystick-base { width: 95px; height: 95px; }
}