/* ============================================
   GAMEBOY COLOR PALETTE
   #0f380f  darkest  — outlines, dark UI
   #306230  dark     — wall, panels, inactive
   #8bac0f  medium   — highlights, active
   #9bbc0f  lightest — canvas BG, light text
   ============================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    image-rendering: pixelated;
    /* manipulation = allows tap/double-tap but prevents pinch-zoom on buttons */
    touch-action: manipulation;
}

/* Override for scrollable containers - pan-y allows vertical swipe-scroll */
#upgradeContainer,
#tutorialBox,
#tutorialSteps {
    touch-action: pan-y;
}

html {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: 'Press Start 2P', monospace;
    background: #0f380f;
    color: #9bbc0f;
    user-select: none;
    touch-action: manipulation;
    height: 100%;
    overflow: hidden;
}

#gameContainer {
    width: 100%;
    /* Stacked fallbacks: 100vh for old browsers, svh accounts for mobile browser chrome */
    height: 100vh;
    height: 100svh;
    display: flex;
    flex-direction: column;
    background: #0f380f;
    overflow: hidden;
}

/* ── STATS BAR ─────────────────────────────── */
#statsBar {
    background: #0f380f;
    color: #9bbc0f;
    padding: clamp(4px, 0.8vh, 8px) clamp(6px, 1.5vw, 14px);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: clamp(2px, 0.5vh, 5px) clamp(4px, 1vw, 10px);
    font-size: clamp(8px, 1.8vw, 11px);
    border-bottom: 4px solid #306230;
    flex-shrink: 0;
    min-width: 0;
}

.stat {
    display: flex;
    gap: 4px;
    align-items: center;
    min-width: 0;
    overflow: hidden;
}

.stat-label {
    color: #8bac0f;
    white-space: nowrap;
    flex-shrink: 0;
}

#moneyDisplay,
#bulletsDisplay,
#wallHPDisplay,
#highScoreDisplay {
    color: #9bbc0f;
    font-size: clamp(8px, 1.8vw, 11px);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    min-width: 0;
}

/* ── CANVAS ────────────────────────────────── */
#gameCanvas {
    flex: 1;
    min-height: 0;
    display: block;
    background: #9bbc0f;
    border-bottom: 4px solid #306230;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
    touch-action: none; /* Prevent all touch gestures (zoom, scroll) on canvas */
}

/* Scanline overlay — sits on top of the canvas via the container */
#gameContainer::after {
    content: '';
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: repeating-linear-gradient(
        to bottom,
        transparent 0px,
        transparent 3px,
        rgba(15, 56, 15, 0.08) 3px,
        rgba(15, 56, 15, 0.08) 4px
    );
    pointer-events: none;
    z-index: 500;
}

/* ── CONTROL PANEL ─────────────────────────── */
#controlPanel {
    background: #306230;
    padding: clamp(6px,1vh,10px) clamp(8px,1.5vw,15px);
    border-bottom: 4px solid #0f380f;
    flex-shrink: 0;
}

#fireControls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: clamp(8px,1.5vw,20px);
    flex-wrap: wrap;
}

#bulletSelector {
    display: flex;
    align-items: center;
    gap: clamp(8px,1.2vw,15px);
    background: #0f380f;
    padding: clamp(6px,1vh,10px) clamp(10px,2vw,16px);
    border: 4px solid #9bbc0f;
    box-shadow: 4px 4px 0px #000;
}

.x-button {
    width: clamp(28px, 5vw, 44px);
    height: clamp(28px, 5vw, 44px);
    font-size: clamp(14px, 2.5vw, 22px);
    font-family: 'Press Start 2P', monospace;
    background: #8bac0f;
    color: #0f380f;
    border: 3px solid #0f380f;
    border-radius: 0;
    cursor: pointer;
    box-shadow: 3px 3px 0px #0f380f;
    transition: background 0.08s;
}

.x-button:hover  { background: #9bbc0f; }
.x-button:active { background: #306230; box-shadow: none; transform: translate(3px,3px); }

#xDisplay {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 110px;
}

.x-label {
    font-size: clamp(10px, 2vw, 12px);
    color: #8bac0f;
    margin-bottom: 4px;
}

#xValue {
    font-size: clamp(16px, 4vw, 32px);
    color: #9bbc0f;
}

/* ── FIRE BUTTON ───────────────────────────── */
.main-button {
    padding: clamp(8px,1.5vh,14px) clamp(20px,4vw,48px);
    font-size: clamp(12px, 3vw, 18px);
    font-family: 'Press Start 2P', monospace;
    background: #306230;
    color: #8bac0f;
    border: 4px solid #0f380f;
    border-radius: 0;
    cursor: not-allowed;
    box-shadow: 4px 4px 0px #0f380f;
    letter-spacing: 2px;
    transition: background 0.08s, color 0.08s;
}

.main-button.ready          { background: #8bac0f; color: #0f380f; cursor: pointer; }
.main-button.ready:hover    { background: #9bbc0f; }
.main-button.ready:active   { box-shadow: none; transform: translate(4px,4px); }

/* ── RESTART BUTTON ────────────────────────── */
.restart-button {
    margin-top: 20px;
    padding: 12px 30px;
    font-size: clamp(10px, 2.5vw, 14px);
    font-family: 'Press Start 2P', monospace;
    background: #8bac0f;
    color: #0f380f;
    border: 4px solid #0f380f;
    border-radius: 0;
    cursor: pointer;
    box-shadow: 4px 4px 0px #000;
    transition: background 0.08s;
}

.restart-button:hover  { background: #9bbc0f; }
.restart-button:active { box-shadow: none; transform: translate(4px,4px); }

/* ── AUTOFIRE TOGGLE ───────────────────────── */
#autofireToggle {
    background: #0f380f;
    padding: clamp(6px,1vh,10px) clamp(8px,1.5vw,14px);
    border: 3px solid #8bac0f;
    box-shadow: 3px 3px 0px #000;
}

.toggle-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: clamp(9px, 2vw, 12px);
    color: #9bbc0f;
}

.toggle-label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: #8bac0f;
}

/* ── UPGRADE SECTION ───────────────────────── */
#upgradeSection {
    background: #0f380f;
    flex-shrink: 0;
    height: clamp(200px, 35vh, 320px);
    display: flex;
    flex-direction: column;
    border-top: 4px solid #306230;
    /* removed overflow:hidden — was killing scroll on mobile Safari */
}

#tabButtons {
    display: flex;
    background: #0f380f;
    border-bottom: 4px solid #306230;
    flex-shrink: 0;
}

.tab-button {
    flex: 1;
    padding: clamp(8px, 1.2vh, 12px) 2px;
    font-size: clamp(10px, 2vw, 12px);
    font-family: 'Press Start 2P', monospace;
    background: #0f380f;
    color: #8bac0f;
    border: none;
    border-right: 3px solid #306230;
    cursor: pointer;
    transition: background 0.08s;
    text-align: center;
    line-height: 1.8;
}

.tab-button:last-child { border-right: none; }
.tab-button:hover      { background: #306230; color: #9bbc0f; }
.tab-button.active     { background: #306230; color: #9bbc0f; border-bottom: 4px solid #8bac0f; }

#upgradeContainer {
    flex: 1;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
    padding: clamp(6px,1vh,10px);
}

.upgrade-tab        { display: none; }
.upgrade-tab.active { display: block; }

/* ── UPGRADE ITEMS ─────────────────────────── */
.upgrade-item,
.unit-upgrade {
    background: #306230;
    padding: clamp(6px,1vh,10px) 12px;
    margin-bottom: 6px;
    border: 3px solid #0f380f;
    border-radius: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 3px 3px 0px #0f380f;
    transition: background 0.08s, border-color 0.08s;
}

.upgrade-item:hover,
.unit-upgrade:hover  { background: #3d7a3d; border-color: #8bac0f; }

.unit-upgrade.locked { opacity: 0.5; }

.upgrade-info h3 {
    font-size: clamp(10px, 2.2vw, 13px);
    margin-bottom: 5px;
    color: #9bbc0f;
    line-height: 1.6;
}

.upgrade-info p {
    font-size: clamp(9px, 1.8vw, 11px);
    color: #8bac0f;
    margin-bottom: 3px;
    line-height: 2;
}

.upgrade-info .desc { color: #8bac0f; font-style: normal; }

/* ── BUY BUTTON ────────────────────────────── */
.buy-button {
    padding: clamp(7px, 1.2vh, 10px) clamp(10px, 2vw, 16px);
    font-size: clamp(10px, 2vw, 12px);
    font-family: 'Press Start 2P', monospace;
    background: #8bac0f;
    color: #0f380f;
    border: 3px solid #0f380f;
    border-radius: 0;
    cursor: pointer;
    min-width: 68px;
    text-align: center;
    box-shadow: 3px 3px 0px #0f380f;
    transition: background 0.08s;
    white-space: nowrap;
}

.buy-button:hover:not(.unaffordable)  { background: #9bbc0f; }
.buy-button:active:not(.unaffordable) { box-shadow: none; transform: translate(3px,3px); }

.buy-button.unaffordable {
    background: #306230;
    color: #8bac0f;
    cursor: not-allowed;
    box-shadow: 2px 2px 0px #0f380f;
    opacity: 0.65;
}

/* ── SCROLLBAR ─────────────────────────────── */
#upgradeContainer::-webkit-scrollbar       { width: 8px; }
#upgradeContainer::-webkit-scrollbar-track { background: #0f380f; }
#upgradeContainer::-webkit-scrollbar-thumb { background: #306230; border: 2px solid #0f380f; border-radius: 0; }
#upgradeContainer::-webkit-scrollbar-thumb:hover { background: #8bac0f; }

/* ── GAME OVER ─────────────────────────────── */
#gameOverScreen {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(15,56,15,0.95);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

#gameOverContent {
    background: #0f380f;
    padding: 30px 40px;
    border: 6px solid #8bac0f;
    box-shadow: 8px 8px 0px #000;
    text-align: center;
    max-width: 90vw;
}

#gameOverContent h1 {
    color: #8bac0f;
    font-size: clamp(10px,2.5vw,20px);
    margin-bottom: 20px;
    line-height: 1.8;
    letter-spacing: 2px;
    animation: gbBlink 1s step-end infinite;
}

@keyframes gbBlink {
    0%,100% { opacity: 1; }
    50%     { opacity: 0.35; }
}

#gameOverContent p {
    font-size: clamp(9px, 2vw, 12px);
    margin-bottom: 14px;
    color: #9bbc0f;
    line-height: 2.2;
}

#finalScore, #finalKills, #finalMoney { color: #8bac0f; }

/* ── RESPONSIVE ────────────────────────────── */
@media (max-height: 700px) {
    #upgradeSection { height: 190px; }
    #statsBar       { padding: 5px 8px; }
    #controlPanel   { padding: 6px 10px; }
}

@media (max-width: 480px) {
    .tab-button      { font-size: 10px; padding: 8px 2px; }
    #xDisplay        { min-width: 80px; }
    .main-button     { padding: 10px 18px; font-size: 12px; }
    .upgrade-info h3 { font-size: 10px; }
    .upgrade-info p  { font-size: 9px; }
    .buy-button      { font-size: 10px; }
}

/* ═══════════════════════════════════════════════
   TITLE SCREEN
═══════════════════════════════════════════════ */
#titleScreen {
    position: fixed;
    inset: 0;
    background: #0f380f;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    overflow: hidden;
}

/* Scanline on title too */
#titleScreen::after {
    content: '';
    position: absolute;
    inset: 0;
    background: repeating-linear-gradient(
        to bottom,
        transparent 0px, transparent 3px,
        rgba(0,0,0,0.12) 3px, rgba(0,0,0,0.12) 4px
    );
    pointer-events: none;
}

#titleContent {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: clamp(10px, 2.5vh, 22px);
    padding: 20px;
    z-index: 1;
    text-align: center;
}

#titleHeading {
    font-family: 'Press Start 2P', monospace;
    font-size: clamp(18px, 5vw, 42px);
    color: #9bbc0f;
    line-height: 1.6;
    letter-spacing: 4px;
    text-shadow: 4px 4px 0 #306230, 8px 8px 0 #0a2a0a;
    animation: titlePulse 3s ease-in-out infinite;
}

@keyframes titlePulse {
    0%,100% { text-shadow: 4px 4px 0 #306230, 8px 8px 0 #0a2a0a; }
    50%      { text-shadow: 4px 4px 0 #8bac0f, 8px 8px 0 #306230; }
}

#titleSub {
    font-family: 'Press Start 2P', monospace;
    font-size: clamp(9px, 2vw, 12px);
    color: #8bac0f;
    letter-spacing: 3px;
}

#titleBlink {
    font-family: 'Press Start 2P', monospace;
    font-size: clamp(10px, 2.2vw, 13px);
    color: #9bbc0f;
    animation: gbBlink 1s step-end infinite;
    letter-spacing: 2px;
}

#titleButtons {
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: center;
    margin-top: 8px;
}

.title-btn {
    font-family: 'Press Start 2P', monospace;
    font-size: clamp(11px, 2.5vw, 15px);
    padding: clamp(12px, 2vh, 18px) clamp(24px, 5vw, 44px);
    background: #8bac0f;
    color: #0f380f;
    border: 4px solid #0f380f;
    border-radius: 0;
    cursor: pointer;
    box-shadow: 5px 5px 0 #0a2a0a;
    transition: background 0.08s;
    letter-spacing: 1px;
}
.title-btn:hover  { background: #9bbc0f; }
.title-btn:active { box-shadow: none; transform: translate(5px,5px); }

.title-btn-secondary {
    background: #306230;
    color: #9bbc0f;
    border-color: #8bac0f;
    box-shadow: 4px 4px 0 #0a2a0a;
    font-size: clamp(10px, 2vw, 13px);
}
.title-btn-secondary:hover { background: #3d7a3d; }

/* ═══════════════════════════════════════════════
   TUTORIAL SCREEN
═══════════════════════════════════════════════ */
#tutorialScreen {
    position: fixed;
    inset: 0;
    background: rgba(10, 28, 10, 0.97);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2100;
    padding: 16px;
}

#tutorialBox {
    background: #0f380f;
    border: 5px solid #8bac0f;
    box-shadow: 8px 8px 0 #000;
    padding: clamp(16px, 3vw, 32px);
    max-width: min(560px, 95vw);
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    max-height: 90vh;
    overflow-y: auto;
}

#tutorialSteps {
    width: 100%;
    min-height: clamp(200px, 35vh, 280px);
}

.tut-step {
    display: none;
    flex-direction: column;
    gap: 12px;
    animation: tutFadeIn 0.2s ease;
}
.tut-step.active { display: flex; }

@keyframes tutFadeIn {
    from { opacity: 0; transform: translateX(8px); }
    to   { opacity: 1; transform: translateX(0); }
}

.tut-icon {
    font-size: clamp(24px, 5vw, 36px);
    text-align: center;
}

.tut-step h2 {
    font-family: 'Press Start 2P', monospace;
    font-size: clamp(11px, 2.5vw, 15px);
    color: #9bbc0f;
    text-align: center;
    line-height: 1.8;
    border-bottom: 3px solid #306230;
    padding-bottom: 8px;
}

.tut-step p {
    font-family: 'Press Start 2P', monospace;
    font-size: clamp(10px, 2vw, 12px);
    color: #8bac0f;
    line-height: 2.2;
    text-align: left;
}

.tut-tip {
    background: #306230;
    border-left: 4px solid #8bac0f;
    padding: 8px 10px;
    color: #9bbc0f !important;
}

.tut-hi {
    color: #9bbc0f;
    font-weight: bold;
}

#tutorialNav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    gap: 8px;
}

.tut-nav-btn {
    font-family: 'Press Start 2P', monospace;
    font-size: clamp(10px, 2vw, 12px);
    padding: 10px 16px;
    background: #306230;
    color: #9bbc0f;
    border: 3px solid #8bac0f;
    cursor: pointer;
    box-shadow: 3px 3px 0 #000;
    transition: background 0.08s;
    white-space: nowrap;
}
.tut-nav-btn:hover:not(:disabled)  { background: #3d7a3d; }
.tut-nav-btn:active:not(:disabled) { box-shadow: none; transform: translate(3px,3px); }
.tut-nav-btn:disabled { opacity: 0.35; cursor: not-allowed; }

#tutDots {
    display: flex;
    gap: 8px;
    justify-content: center;
    flex: 1;
}

.tut-dot {
    width: 10px;
    height: 10px;
    background: #306230;
    border: 2px solid #8bac0f;
    display: inline-block;
    transition: background 0.1s;
}
.tut-dot.active { background: #8bac0f; }