/* ==========================================================
   小猫战场 — NEON ARCADE THEME
   Deep space + neon accents + pixel typography + CRT texture
   ========================================================== */

:root {
    --neon-pink: #ff2d7b;
    --neon-cyan: #00f5d4;
    --neon-yellow: #f9f871;
    --neon-orange: #ff9f43;
    --neon-green: #0be881;
    --deep: #06060f;
    --surface: #0d0d1a;
    --surface-light: #151528;
    --glass: rgba(255, 255, 255, 0.04);
    --glass-border: rgba(255, 255, 255, 0.08);
    --text: #e8e6f0;
    --text-dim: rgba(255, 255, 255, 0.45);
    --font-pixel: 'Press Start 2P', monospace;
    --font-body: 'Chakra Petch', sans-serif;
    --radius: 6px;
    --transition: 0.2s cubic-bezier(.4, 0, .2, 1);
}

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

body {
    background: var(--deep);
    font-family: var(--font-body);
    color: var(--text);
    overflow: hidden;
    width: 100vw;
    height: 100vh;
    position: fixed;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
}

/* ==================== STARFIELD ==================== */
.starfield {
    position: fixed;
    inset: 0;
    z-index: 0;
    overflow: hidden;
}

.star-layer {
    position: absolute;
    inset: 0;
    background-repeat: repeat;
    background-size: 600px 600px;
}

.star-layer--1 {
    background-image:
        radial-gradient(1px 1px at 50px 80px, rgba(255,255,255,0.7), transparent),
        radial-gradient(1px 1px at 180px 200px, rgba(255,255,255,0.5), transparent),
        radial-gradient(1.5px 1.5px at 300px 50px, rgba(255,255,255,0.8), transparent),
        radial-gradient(1px 1px at 420px 310px, rgba(255,255,255,0.4), transparent),
        radial-gradient(1px 1px at 520px 450px, rgba(255,255,255,0.6), transparent),
        radial-gradient(1.5px 1.5px at 100px 400px, var(--neon-cyan), transparent),
        radial-gradient(1px 1px at 350px 500px, rgba(255,255,255,0.3), transparent);
    animation: drift 80s linear infinite;
}

.star-layer--2 {
    background-image:
        radial-gradient(1px 1px at 70px 250px, rgba(255,255,255,0.6), transparent),
        radial-gradient(1.5px 1.5px at 250px 120px, rgba(255,255,255,0.4), transparent),
        radial-gradient(1px 1px at 450px 380px, var(--neon-pink), transparent),
        radial-gradient(1px 1px at 150px 500px, rgba(255,255,255,0.5), transparent),
        radial-gradient(1px 1px at 530px 100px, rgba(255,255,255,0.3), transparent);
    animation: drift 120s linear infinite reverse;
    opacity: 0.7;
}

.star-layer--3 {
    background-image:
        radial-gradient(2px 2px at 200px 300px, var(--neon-yellow), transparent),
        radial-gradient(1px 1px at 500px 200px, rgba(255,255,255,0.5), transparent),
        radial-gradient(1px 1px at 80px 150px, rgba(255,255,255,0.3), transparent);
    animation: drift 200s linear infinite;
    opacity: 0.5;
}

@keyframes drift {
    from { transform: translate(0, 0); }
    to   { transform: translate(-600px, -600px); }
}

/* Nebula glow */
.starfield::after {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 80%, rgba(255,45,123,0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(0,245,212,0.06) 0%, transparent 50%);
    pointer-events: none;
}

/* ==================== SCANLINES ==================== */
.scanlines {
    position: fixed;
    inset: 0;
    z-index: 9999;
    pointer-events: none;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(0, 0, 0, 0.06) 2px,
        rgba(0, 0, 0, 0.06) 4px
    );
}

/* ==================== SCREENS (menu overlays) ==================== */
.screen {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: screenIn 0.35s ease-out;
}

.screen--overlay {
    background: rgba(6, 6, 15, 0.85);
    backdrop-filter: blur(8px);
}

.screen--gameover {
    background: radial-gradient(ellipse at center, rgba(255,45,123,0.12) 0%, rgba(6,6,15,0.96) 65%);
}

@keyframes screenIn {
    from { opacity: 0; transform: translateY(12px) scale(0.98); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* ==================== MENU FRAME ==================== */
.menu-frame {
    width: 90%;
    max-width: 680px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 32px;
    padding: 40px 24px;
}

.menu-frame--narrow { max-width: 460px; }
.menu-frame--compact { gap: 24px; padding: 32px 20px; }

/* ==================== TITLE BLOCK ==================== */
.title-block {
    text-align: center;
    position: relative;
}

.title-sub {
    font-family: var(--font-body);
    font-size: 0.75rem;
    letter-spacing: 0.4em;
    color: var(--neon-cyan);
    text-transform: uppercase;
    margin-bottom: 8px;
    font-weight: 600;
}

.title-main {
    font-family: var(--font-pixel);
    font-size: clamp(1.6rem, 5vw, 2.8rem);
    color: #fff;
    text-shadow:
        0 0 10px var(--neon-pink),
        0 0 40px rgba(255, 45, 123, 0.4),
        0 0 80px rgba(255, 45, 123, 0.15);
    line-height: 1.3;
    animation: titlePulse 3s ease-in-out infinite alternate;
}

@keyframes titlePulse {
    from { text-shadow: 0 0 10px var(--neon-pink), 0 0 40px rgba(255,45,123,0.4); }
    to   { text-shadow: 0 0 15px var(--neon-pink), 0 0 60px rgba(255,45,123,0.5), 0 0 100px rgba(255,45,123,0.2); }
}

.title-cat {
    display: block;
    margin-left: auto;
    margin-right: auto;
    width: clamp(80px, 18vw, 140px);
    height: auto;
    margin-top: 16px;
    margin-bottom: 8px;
    border-radius: 50%;
    filter: invert(1) drop-shadow(0 0 24px rgba(255,45,123,0.5)) drop-shadow(0 0 48px rgba(255,45,123,0.2));
    background: transparent;
    animation: catBounce 2s ease-in-out infinite;
}

@keyframes catBounce {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(-8px); }
}

.badge {
    display: inline-block;
    font-family: var(--font-pixel);
    font-size: 0.55rem;
    color: var(--neon-cyan);
    border: 1px solid var(--neon-cyan);
    padding: 4px 12px;
    border-radius: 2px;
    letter-spacing: 0.1em;
    margin-top: 12px;
    box-shadow: 0 0 8px rgba(0,245,212,0.2), inset 0 0 8px rgba(0,245,212,0.05);
}

.screen-title {
    font-family: var(--font-pixel);
    font-size: clamp(0.85rem, 2.5vw, 1.2rem);
    color: var(--neon-cyan);
    text-shadow: 0 0 12px rgba(0,245,212,0.5);
    letter-spacing: 0.15em;
}

.version {
    font-family: var(--font-pixel);
    font-size: 0.5rem;
    color: var(--text-dim);
    letter-spacing: 0.2em;
}

/* ==================== BUTTONS ==================== */
.btn-stack {
    display: flex;
    flex-direction: column;
    gap: 10px;
    width: 100%;
    max-width: 300px;
}

.btn {
    font-family: var(--font-body);
    font-weight: 700;
    font-size: 0.95rem;
    letter-spacing: 0.08em;
    color: var(--text);
    background: var(--glass);
    border: 1px solid var(--glass-border);
    padding: 14px 24px;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
    text-align: center;
}

.btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent 40%, rgba(255,255,255,0.03) 100%);
    transition: opacity var(--transition);
}

.btn:hover, .btn:active {
    border-color: rgba(255,255,255,0.2);
    background: rgba(255,255,255,0.06);
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.btn--primary {
    background: linear-gradient(135deg, var(--neon-pink), #d6246a);
    border-color: var(--neon-pink);
    color: #fff;
    text-shadow: 0 1px 2px rgba(0,0,0,0.3);
    box-shadow: 0 0 20px rgba(255,45,123,0.25);
}

.btn--primary:hover, .btn--primary:active {
    background: linear-gradient(135deg, #ff4d93, var(--neon-pink));
    box-shadow: 0 0 30px rgba(255,45,123,0.4), 0 4px 20px rgba(0,0,0,0.3);
    border-color: #ff4d93;
    transform: translateY(-2px);
}

.btn--back {
    font-size: 0.8rem;
    padding: 10px 20px;
    color: var(--text-dim);
    border-color: transparent;
    background: transparent;
}
.btn--back:hover { color: var(--text); border-color: var(--glass-border); }

.btn__icon {
    font-size: 0.7em;
    margin-right: 6px;
}

/* ==================== DIFFICULTY CARDS ==================== */
.diff-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
    width: 100%;
    max-width: 640px;
}

.diff-card {
    background: var(--surface-light);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    padding: 20px 12px 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
    text-align: center;
    font-family: var(--font-body);
    color: var(--text);
}

/* Neon top-edge glow */
.diff-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 10%;
    right: 10%;
    height: 2px;
    border-radius: 0 0 4px 4px;
    transition: all var(--transition);
}

.diff-card--green  { border-top: 2px solid var(--neon-green); }
.diff-card--green::before  { background: var(--neon-green); box-shadow: 0 0 12px var(--neon-green); }
.diff-card--cyan   { border-top: 2px solid var(--neon-cyan); }
.diff-card--cyan::before   { background: var(--neon-cyan); box-shadow: 0 0 12px var(--neon-cyan); }
.diff-card--orange { border-top: 2px solid var(--neon-orange); }
.diff-card--orange::before { background: var(--neon-orange); box-shadow: 0 0 12px var(--neon-orange); }
.diff-card--pink   { border-top: 2px solid var(--neon-pink); }
.diff-card--pink::before   { background: var(--neon-pink); box-shadow: 0 0 12px var(--neon-pink); }

.diff-card:hover {
    transform: translateY(-4px);
    border-color: rgba(255,255,255,0.15);
    box-shadow: 0 8px 30px rgba(0,0,0,0.4);
}
.diff-card--green:hover  { box-shadow: 0 8px 30px rgba(0,0,0,0.4), 0 0 25px rgba(11,232,129,0.15); }
.diff-card--cyan:hover   { box-shadow: 0 8px 30px rgba(0,0,0,0.4), 0 0 25px rgba(0,245,212,0.15); }
.diff-card--orange:hover { box-shadow: 0 8px 30px rgba(0,0,0,0.4), 0 0 25px rgba(255,159,67,0.15); }
.diff-card--pink:hover   { box-shadow: 0 8px 30px rgba(0,0,0,0.4), 0 0 25px rgba(255,45,123,0.15); }

.diff-card__emoji { font-size: 2.2rem; }
.diff-card__name  { font-family: var(--font-pixel); font-size: 0.7rem; letter-spacing: 0.1em; }
.diff-card__desc  { font-size: 0.72rem; color: var(--text-dim); line-height: 1.4; }
.diff-card__stars { font-size: 0.65rem; color: var(--neon-yellow); letter-spacing: 2px; margin-top: 2px; }

/* ==================== SETTINGS ==================== */
.settings-list {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.setting {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: default;
}

.setting select {
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--neon-cyan);
    background: var(--surface);
    border: 1px solid rgba(0,245,212,0.2);
    padding: 6px 10px;
    border-radius: 4px;
    cursor: pointer;
    transition: all var(--transition);
}
.setting select:focus {
    outline: none;
    border-color: var(--neon-cyan);
    box-shadow: 0 0 10px rgba(0,245,212,0.2);
}
.setting select option {
    background: var(--surface);
    color: var(--text);
}

/* ==================== CONTROLS PANEL ==================== */
.controls-panel {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.panel-heading {
    font-family: var(--font-pixel);
    font-size: 0.6rem;
    color: var(--neon-yellow);
    letter-spacing: 0.15em;
    margin-bottom: 8px;
}

.key-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    background: var(--glass);
    border-radius: 4px;
    margin-bottom: 4px;
    font-size: 0.85rem;
}

.key-row kbd {
    font-family: var(--font-pixel);
    font-size: 0.55rem;
    color: var(--neon-cyan);
    background: rgba(0,245,212,0.08);
    border: 1px solid rgba(0,245,212,0.2);
    padding: 4px 8px;
    border-radius: 3px;
}

/* ==================== ABOUT ==================== */
.about-body {
    text-align: center;
    line-height: 1.7;
    font-size: 0.9rem;
    color: var(--text-dim);
}
.about-body strong { color: var(--text); }
.about-body p { margin-bottom: 10px; }
.about-tech {
    font-family: var(--font-pixel);
    font-size: 0.5rem;
    color: var(--neon-cyan);
    letter-spacing: 0.12em;
    margin-top: 12px;
}
.about-versions {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-top: 12px;
    font-size: 0.75rem;
    color: var(--text-dim);
}

/* ==================== GAME OVER ==================== */
.gameover-title {
    font-family: var(--font-pixel);
    font-size: clamp(1.1rem, 3.5vw, 1.8rem);
    color: var(--neon-pink);
    text-shadow: 0 0 20px rgba(255,45,123,0.6), 0 0 60px rgba(255,45,123,0.2);
    animation: glitch 4s infinite;
    letter-spacing: 0.15em;
}

@keyframes glitch {
    0%, 95%, 100% { transform: translate(0); }
    96% { transform: translate(-2px, 1px); }
    97% { transform: translate(2px, -1px); }
    98% { transform: translate(-1px, -1px); }
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
    width: 100%;
    max-width: 320px;
}

.stat {
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 12px;
    text-align: center;
}
.stat__label { display: block; font-size: 0.7rem; color: var(--text-dim); margin-bottom: 4px; }
.stat__value { font-family: var(--font-pixel); font-size: 0.8rem; color: var(--neon-yellow); }

/* ==================== GAME HUD ==================== */
.game-container {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    position: relative;
}

.game-container .game-header,
.game-container .game-info,
.game-container .weapon-info,
.game-container .fps-counter,
.game-container .desktop-controls,
.game-container .mobile-instructions,
.game-container .mobile-controls { display: none; }

.game-container.playing .game-header,
.game-container.playing .weapon-info { display: block; }
.game-container.playing .game-info { display: flex; }

body:not(.mobile-mode) .game-container.playing .desktop-controls { display: block; }
body.mobile-mode .game-container.playing .mobile-instructions { display: block; }
body.mobile-mode .game-container.playing .mobile-controls { display: flex; }

.game-header {
    background: linear-gradient(180deg, rgba(6,6,15,0.95) 0%, rgba(6,6,15,0.7) 100%);
    padding: 8px 16px;
    z-index: 100;
    border-bottom: 1px solid rgba(255,45,123,0.15);
}

.game-title-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.hud-title {
    font-family: var(--font-pixel);
    font-size: 0.6rem;
    color: var(--text);
    letter-spacing: 0.1em;
}

.pause-btn {
    background: transparent;
    border: 1px solid var(--glass-border);
    color: var(--text);
    width: 36px;
    height: 36px;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 14px;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}
.pause-btn:hover { border-color: var(--neon-pink); color: var(--neon-pink); }

canvas {
    background: var(--deep);
    flex: 1;
    width: 100%;
    cursor: crosshair;
    touch-action: none;
}

.game-info {
    position: absolute;
    top: 44px;
    left: 0;
    right: 0;
    display: flex;
    flex-direction: row;
    justify-content: center;
    gap: 4px;
    padding: 0 12px;
    z-index: 150;
    pointer-events: none;
}

.hud-item {
    font-family: var(--font-pixel);
    font-size: 0.5rem;
    letter-spacing: 0.05em;
    padding: 5px 10px;
    background: rgba(6,6,15,0.7);
    border: 1px solid var(--glass-border);
    border-radius: 3px;
    color: var(--text-dim);
    white-space: nowrap;
}

.hud-item strong {
    color: var(--text);
    margin-left: 3px;
}

.hud-item--score strong { color: var(--neon-yellow); }
.hud-item--lives strong { color: var(--neon-pink); }
.hud-item--wave strong  { color: var(--neon-cyan); }

.weapon-info {
    position: absolute;
    top: 72px;
    right: 12px;
    font-family: var(--font-pixel);
    font-size: 0.45rem;
    color: var(--neon-yellow);
    background: rgba(6,6,15,0.7);
    border: 1px solid rgba(249,248,113,0.15);
    padding: 5px 10px;
    border-radius: 3px;
    z-index: 150;
}

.fps-counter {
    position: absolute;
    top: 72px;
    left: 12px;
    font-family: var(--font-pixel);
    font-size: 0.45rem;
    color: var(--neon-green);
    background: rgba(6,6,15,0.7);
    padding: 5px 10px;
    border-radius: 3px;
    z-index: 150;
}

.desktop-controls {
    position: absolute;
    bottom: 12px;
    left: 50%;
    transform: translateX(-50%);
    font-family: var(--font-pixel);
    font-size: 0.4rem;
    color: var(--text-dim);
    letter-spacing: 0.05em;
    z-index: 150;
}

/* ==================== MOBILE CONTROLS ==================== */
.mobile-instructions {
    position: absolute;
    bottom: 135px;
    left: 50%;
    transform: translateX(-50%);
    font-family: var(--font-pixel);
    font-size: 0.4rem;
    color: var(--text-dim);
    padding: 5px 12px;
    background: rgba(6,6,15,0.6);
    border-radius: 3px;
    z-index: 150;
    white-space: nowrap;
}

body.tablet-mode .mobile-instructions { bottom: 155px; font-size: 0.5rem; }
body.phone-mode .mobile-instructions  { bottom: 140px; }

.mobile-controls {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 120px;
    background: linear-gradient(0deg, rgba(6,6,15,0.9) 0%, rgba(6,6,15,0.5) 100%);
    display: none;
    justify-content: space-between;
    align-items: center;
    padding: 15px 25px;
    z-index: 200;
    border-top: 1px solid rgba(255,255,255,0.04);
}

body.tablet-mode .mobile-controls { height: 140px; padding: 20px 30px; }
body.phone-mode .mobile-controls  { height: 130px; padding: 15px 20px; }

.joystick-container {
    position: relative;
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
}
body.tablet-mode .joystick-container { width: 100px; height: 100px; }
body.phone-mode .joystick-container  { width: 85px; height: 85px; }

.joystick-base {
    width: 100%;
    height: 100%;
    border: 2px solid rgba(0,245,212,0.3);
    border-radius: 50%;
    background: rgba(0,245,212,0.04);
    position: absolute;
    box-shadow: 0 0 15px rgba(0,245,212,0.08), inset 0 0 15px rgba(0,245,212,0.04);
}

.joystick-stick {
    width: 50%;
    height: 50%;
    background: rgba(0,245,212,0.6);
    border: 2px solid var(--neon-cyan);
    border-radius: 50%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    transition: all 0.08s ease;
    box-shadow: 0 0 12px rgba(0,245,212,0.3);
    z-index: 2;
}

.shoot-button {
    width: 80px;
    height: 80px;
    background: linear-gradient(145deg, var(--neon-pink), #d6246a);
    border: 2px solid rgba(255,45,123,0.6);
    border-radius: 50%;
    color: white;
    font-size: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.06s ease;
    touch-action: manipulation;
    user-select: none;
    box-shadow: 0 0 20px rgba(255,45,123,0.3), inset 0 1px 3px rgba(255,255,255,0.15);
}

body.tablet-mode .shoot-button { width: 100px; height: 100px; font-size: 30px; }
body.phone-mode .shoot-button  { width: 85px; height: 85px; font-size: 26px; }

.shoot-button:active {
    transform: scale(0.92);
    box-shadow: 0 0 30px rgba(255,45,123,0.5), inset 0 2px 6px rgba(0,0,0,0.3);
}

/* Touch expansions */
.joystick-container::before,
.shoot-button::before {
    content: '';
    position: absolute;
    top: -12px; left: -12px; right: -12px; bottom: -12px;
    border-radius: 50%;
    z-index: -1;
}

/* ==================== DEBUG ==================== */
.debug-touch-info {
    position: absolute;
    top: 100px;
    left: 12px;
    font-family: var(--font-pixel);
    font-size: 0.4rem;
    color: var(--neon-green);
    background: rgba(0,0,0,0.8);
    padding: 8px;
    border-radius: 4px;
    z-index: 300;
    display: none;
    line-height: 1.8;
}
body.debug-mode .debug-touch-info { display: block; }

/* ==================== RESPONSIVE ==================== */
@media (max-width: 480px) {
    .title-main { font-size: 1.4rem; }
    .menu-frame { padding: 24px 16px; gap: 24px; }
    .btn { padding: 12px 20px; font-size: 0.85rem; }
    .diff-grid { grid-template-columns: repeat(2, 1fr); gap: 8px; }
    .diff-card { padding: 14px 8px 12px; }
    .diff-card__emoji { font-size: 1.8rem; }
    .diff-card__name { font-size: 0.6rem; }
    .diff-card__desc { font-size: 0.6rem; }
    .mobile-controls { height: 110px; padding: 12px 15px; }
    .joystick-container { width: 75px; height: 75px; }
    .shoot-button { width: 75px; height: 75px; font-size: 22px; }
    .mobile-instructions { bottom: 120px; }
    .hud-item { font-size: 0.4rem; padding: 4px 6px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 6px; }
}

@media (min-width: 768px) {
    .diff-grid { grid-template-columns: repeat(4, 1fr); }
}

@media (orientation: landscape) and (max-height: 600px) {
    .title-main { font-size: 1.2rem; }
    .title-cat { font-size: 2rem; margin: 4px 0; }
    .menu-frame { padding: 16px; gap: 16px; }
    .btn-stack { flex-direction: row; flex-wrap: wrap; justify-content: center; max-width: none; }
    .btn { min-width: 120px; padding: 10px 16px; font-size: 0.8rem; }
    .diff-grid { grid-template-columns: repeat(4, 1fr); gap: 8px; }
    .mobile-controls { height: 100px; padding: 10px 20px; }
    .joystick-container { width: 70px; height: 70px; }
    .shoot-button { width: 70px; height: 70px; font-size: 20px; }
}

@media (min-width: 1200px) {
    .diff-grid { grid-template-columns: repeat(4, 1fr); max-width: 720px; }
    .hud-item { font-size: 0.75rem; padding: 6px 12px; }
    .hud-title { font-size: 0.85rem; }
    .weapon-info { font-size: 0.65rem; }
    .fps-counter { font-size: 0.65rem; }
    .desktop-controls { font-size: 0.6rem; }
    .key-row kbd { font-size: 0.75rem; }
    .screen-title { font-size: clamp(1rem, 2.5vw, 1.5rem); }
}

@media (min-aspect-ratio: 16/9) {
    .game-container { max-width: 1400px; margin: 0 auto; }
}

/* ==================== ACCESSIBILITY ==================== */
body.mobile-mode { touch-action: none; }
body.mobile-mode canvas { cursor: none; }

button:focus-visible {
    outline: 2px solid var(--neon-cyan);
    outline-offset: 3px;
}
select:focus-visible {
    outline: 2px solid var(--neon-cyan);
    outline-offset: 2px;
}

@media (prefers-contrast: high) {
    .btn, .diff-card { border-width: 2px; border-color: #fff; }
    .game-header { background: #000; border-bottom: 2px solid #fff; }
    .joystick-base { border-color: #fff; border-width: 3px; }
    .joystick-stick { background: #fff; }
    .shoot-button { background: #ff0000; border-color: #fff; border-width: 3px; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation: none !important; transition: none !important; }
}

/* ==================== PERFORMANCE ==================== */
.menu-btn, .diff-card, .btn, .pause-btn,
.joystick-stick, .shoot-button { will-change: transform; }

.mobile-controls, .game-info, .weapon-info,
.fps-counter, .menu-frame { transform: translateZ(0); }

.joystick-container, .joystick-base,
.joystick-stick, .shoot-button {
    will-change: transform;
    transform: translateZ(0);
    backface-visibility: hidden;
}