/* ============================================
   Atom Rush - Main Stylesheet
   Core layout, HUD styling, and base elements
   ============================================ */

/* CSS Variables for easy theming */
:root {
    /* Background colors */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-panel: rgba(20, 20, 35, 0.95);
    --bg-panel-border: #2a2a4a;
    
    /* Text colors */
    --text-primary: #e0e0e0;
    --text-secondary: #8888aa;
    --text-accent: #00ffaa;
    --text-warning: #ff6b6b;
    
    /* Element category colors */
    --cat-alkali: #FF6B6B;
    --cat-alkaline: #FFE66D;
    --cat-transition: #4ECDC4;
    --cat-post-transition: #95E1D3;
    --cat-metalloid: #F38181;
    --cat-nonmetal: #AA96DA;
    --cat-halogen: #FCBAD3;
    --cat-noble: #A8E6CF;
    --cat-lanthanide: #DDA0DD;
    --cat-actinide: #FF8C42;
    
    /* UI colors */
    --accent-primary: #00ffaa;
    --accent-secondary: #ff00aa;
    --accent-warning: #ffaa00;
    --accent-error: #ff3333;
    
    /* Fonts */
    --font-pixel: 'Press Start 2P', monospace;
    --font-terminal: 'VT323', monospace;
    
    /* Sizes */
    --cell-size: 40px;
    --cell-gap: 2px;
    --hud-width: 160px;
    --border-radius: 4px;
}

/* Reset and Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: #000;
}

body {
    font-family: var(--font-pixel);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    background: 
        radial-gradient(ellipse at center, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

/* Game Container - start hidden so screen-on fade-in doesn't flash */
#game-container {
    position: relative;
    width: 100%;
    height: 100%;
    max-width: 1400px;
    max-height: 900px;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    opacity: 0;
}

/* Screen Management */
.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none;
    justify-content: center;
    align-items: center;
}

.screen.active {
    display: flex;
}

/* ============================================
   Main Menu
   ============================================ */
.menu-content {
    text-align: center;
    padding: 40px;
}

.game-title {
    font-size: 36px;
    margin-bottom: 10px;
    letter-spacing: 4px;
    text-shadow: 
        0 0 10px var(--accent-primary),
        0 0 20px var(--accent-primary),
        0 0 40px var(--accent-primary);
    /* Static glow only on menu to keep it responsive; no infinite animation */
}

.title-element {
    color: var(--accent-primary);
    font-size: 44px;
}

.subtitle {
    font-family: var(--font-terminal);
    font-size: 24px;
    color: var(--text-secondary);
    margin-bottom: 8px;
    letter-spacing: 6px;
}

.tagline {
    font-family: var(--font-terminal);
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 50px;
    letter-spacing: 3px;
    opacity: 0.9;
}

.menu-options {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 50px;
}

.menu-option-with-hint {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.menu-hint {
    font-family: var(--font-terminal);
    font-size: 14px;
    color: var(--text-secondary);
    margin: 0;
    padding: 0 8px;
    line-height: 1.4;
}

.menu-btn {
    font-family: var(--font-pixel);
    font-size: 14px;
    padding: 16px 32px;
    background: var(--bg-panel);
    border: 2px solid var(--bg-panel-border);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.15s ease;
    text-transform: uppercase;
    letter-spacing: 2px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.menu-btn:hover {
    background: var(--bg-panel-border);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    transform: scale(1.02);
    box-shadow: 
        0 0 10px rgba(0, 255, 170, 0.3),
        inset 0 0 20px rgba(0, 255, 170, 0.1);
}

.menu-btn:active {
    transform: scale(0.98);
}

.btn-icon {
    font-size: 12px;
}

/* Easy Mode Toggle */
.menu-btn.mode-toggle {
    font-size: 12px;
    background: rgba(20, 20, 30, 0.8);
    border-style: dashed;
}

.menu-btn.mode-toggle #easy-mode-status,
.menu-btn.mode-toggle #sound-status {
    color: var(--text-secondary);
    font-weight: bold;
}

.menu-btn.mode-toggle.active {
    border-color: var(--accent-secondary);
    background: rgba(255, 230, 109, 0.1);
}

.menu-btn.mode-toggle.active #easy-mode-status,
.menu-btn.mode-toggle.active #sound-status {
    color: var(--accent-secondary);
}

.menu-btn.mode-toggle.active .btn-icon {
    color: var(--accent-secondary);
}

.best-times {
    display: flex;
    justify-content: center;
    gap: 40px;
    padding: 20px;
    background: var(--bg-panel);
    border: 1px solid var(--bg-panel-border);
}

.best-time-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.best-time-item .label {
    font-size: 10px;
    color: var(--text-secondary);
}

.best-time-item .time {
    font-size: 18px;
    color: var(--accent-primary);
}

/* ============================================
   Controls Screen
   ============================================ */
.controls-content {
    text-align: center;
    padding: 40px;
}

.controls-content h2 {
    font-size: 24px;
    margin-bottom: 40px;
    color: var(--accent-primary);
}

.controls-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 40px;
    max-width: 600px;
}

.control-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-panel);
    border: 1px solid var(--bg-panel-border);
}

.controls-help {
    text-align: left;
    max-width: 520px;
    margin: 0 auto 32px;
    padding: 20px;
    background: var(--bg-panel);
    border: 1px solid var(--bg-panel-border);
}

.controls-help h3 {
    font-family: var(--font-pixel);
    font-size: 12px;
    color: var(--accent-primary);
    margin-bottom: 10px;
    letter-spacing: 2px;
}

.controls-help p {
    font-family: var(--font-terminal);
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.5;
    margin: 0;
}

.controls-help strong {
    color: var(--text-primary);
}

.key {
    font-family: var(--font-pixel);
    font-size: 10px;
    padding: 8px 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--text-secondary);
    color: var(--text-primary);
    min-width: 40px;
    text-align: center;
}

.action {
    font-size: 10px;
    color: var(--text-secondary);
    text-align: left;
}

/* ============================================
   Game Screen Layout
   ============================================ */
#game-screen {
    display: none;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    gap: 20px;
    padding: 20px;
}

#game-screen.active {
    display: flex;
}

/* HUD Panels */
.hud-panel {
    width: var(--hud-width);
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.hud-section {
    background: var(--bg-panel);
    border: 2px solid var(--bg-panel-border);
    padding: 12px;
    text-align: center;
}

.hud-label {
    font-size: 8px;
    color: var(--text-secondary);
    margin-bottom: 8px;
    letter-spacing: 2px;
}

.hud-value {
    font-size: 16px;
    color: var(--text-primary);
}

.hud-value.timer {
    font-size: 18px;
    color: var(--accent-primary);
    font-family: var(--font-terminal);
    letter-spacing: 2px;
}

.hud-value.errors {
    color: var(--accent-error);
}

.hud-value.penalty {
    font-size: 12px;
    color: var(--accent-warning);
}

/* Tile Previews (Hold & Next) */
.tile-preview {
    width: 60px;
    height: 60px;
    margin: 0 auto;
    background: var(--bg-secondary);
    border: 1px solid var(--bg-panel-border);
    display: flex;
    justify-content: center;
    align-items: center;
}

.next-queue {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.next-queue .tile-preview {
    width: 50px;
    height: 50px;
}

/* Canvas Wrapper */
#canvas-wrapper {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

#game-canvas {
    background: var(--bg-primary);
    border: 3px solid var(--bg-panel-border);
    box-shadow: 
        0 0 20px rgba(0, 0, 0, 0.5),
        inset 0 0 60px rgba(0, 0, 0, 0.3);
}

/* Hint Banner */
.hint-banner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 16px 32px;
    background: rgba(255, 50, 50, 0.9);
    border: 2px solid var(--accent-error);
    font-size: 12px;
    color: white;
    text-align: center;
    z-index: 100;
    pointer-events: none;
    text-shadow: 2px 2px 0 rgba(0,0,0,0.5);
}

.hint-banner.hidden {
    display: none;
}

/* ============================================
   Pause Overlay
   ============================================ */
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.overlay.hidden {
    display: none;
}

.overlay-content {
    text-align: center;
    padding: 40px;
    background: var(--bg-panel);
    border: 3px solid var(--bg-panel-border);
}

.overlay-content h2 {
    font-size: 28px;
    margin-bottom: 30px;
    color: var(--accent-primary);
    animation: blink 1s step-end infinite;
}

.overlay-message {
    font-family: var(--font-terminal);
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0 0 12px;
}

#screen-size-overlay .overlay-content {
    max-width: 520px;
}

#screen-size-overlay .overlay-content h2 {
    color: var(--text-warning);
    animation: none;
}

.pause-menu {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* ============================================
   Results Screen
   ============================================ */
.results-content {
    text-align: center;
    padding: 40px;
    background: var(--bg-panel);
    border: 3px solid var(--bg-panel-border);
    min-width: 400px;
}

.results-content h2 {
    font-size: 20px;
    margin-bottom: 30px;
    color: var(--accent-primary);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-bottom: 30px;
}

.result-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--bg-panel-border);
}

.result-item .label {
    font-size: 8px;
    color: var(--text-secondary);
}

.result-item .value {
    font-size: 16px;
    color: var(--text-primary);
}

.result-item .value.big {
    font-size: 24px;
    color: var(--accent-primary);
}

.result-item.best {
    grid-column: span 2;
    background: rgba(0, 255, 170, 0.1);
    border-color: var(--accent-primary);
}

.new-record {
    font-size: 14px;
    color: var(--accent-warning);
    padding: 12px;
    animation: rainbow 1s linear infinite;
}

.new-record.hidden {
    display: none;
}

.results-buttons {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* ============================================
   Summary Screen
   ============================================ */
.summary-content {
    text-align: center;
    padding: 40px;
    background: var(--bg-panel);
    border: 3px solid var(--bg-panel-border);
}

.summary-content h2 {
    font-size: 24px;
    margin-bottom: 30px;
    color: var(--accent-primary);
    animation: titleGlow 2s ease-in-out infinite alternate;
}

.summary-stages {
    display: flex;
    gap: 30px;
    margin-bottom: 30px;
}

.stage-summary {
    flex: 1;
    padding: 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--bg-panel-border);
}

.stage-summary h3 {
    font-size: 10px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.summary-stat {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    font-size: 12px;
}

.summary-stat .label {
    color: var(--text-secondary);
}

.summary-stat .value {
    color: var(--text-primary);
}

.total-summary {
    padding: 20px;
    background: rgba(0, 255, 170, 0.1);
    border: 2px solid var(--accent-primary);
    margin-bottom: 30px;
}

.total-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.total-item .label {
    font-size: 10px;
    color: var(--text-secondary);
}

.total-item .value.big {
    font-size: 32px;
    color: var(--accent-primary);
    text-shadow: 0 0 20px var(--accent-primary);
}

.summary-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
}

/* ============================================
   Element Tile Styling
   ============================================ */
.element-tile {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    font-family: var(--font-terminal);
    border: 2px solid rgba(255, 255, 255, 0.3);
    text-shadow: 1px 1px 0 rgba(0, 0, 0, 0.5);
    width: 100%;
    height: 100%;
    box-sizing: border-box;
}

.element-tile .symbol {
    font-size: 20px;
    font-weight: bold;
    line-height: 1;
    letter-spacing: 0;
}

.element-tile .number {
    font-size: 10px;
    opacity: 0.8;
    line-height: 1;
}

/* Smaller tiles in the next queue */
.next-queue .element-tile .symbol {
    font-size: 18px;
}

.next-queue .element-tile .number {
    font-size: 9px;
}

/* Category-specific tile colors */
.element-tile.alkali { background: var(--cat-alkali); }
.element-tile.alkaline { background: var(--cat-alkaline); color: #333; }
.element-tile.transition { background: var(--cat-transition); }
.element-tile.post-transition { background: var(--cat-post-transition); color: #333; }
.element-tile.metalloid { background: var(--cat-metalloid); }
.element-tile.nonmetal { background: var(--cat-nonmetal); }
.element-tile.halogen { background: var(--cat-halogen); color: #333; }
.element-tile.noble { background: var(--cat-noble); color: #333; }
.element-tile.lanthanide { background: var(--cat-lanthanide); }
.element-tile.actinide { background: var(--cat-actinide); }

/* ============================================
   Responsive Adjustments
   ============================================ */
@media (max-width: 1200px) {
    :root {
        --cell-size: 35px;
        --hud-width: 140px;
    }
    
    .game-title {
        font-size: 28px;
    }
    
    .title-element {
        font-size: 36px;
    }
}

@media (max-width: 900px) {
    :root {
        --cell-size: 28px;
        --hud-width: 120px;
    }
    
    .game-title {
        font-size: 20px;
    }
    
    .title-element {
        font-size: 28px;
    }
    
    .menu-btn {
        font-size: 12px;
        padding: 12px 24px;
    }
}