/* ============================================================
   Block Blaster - Complete CSS
   ============================================================ */

/* === 1. Reset & Base === */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: linear-gradient(135deg, #0f0c29 0%, #302b63 50%, #24243e 100%);
    font-family: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    -webkit-tap-highlight-color: transparent;
    touch-action: none;
    user-select: none;
    -webkit-user-select: none;
    color: #fff;
}

#app {
    width: 100%;
    height: 100%;
    max-width: 500px;
    margin: 0 auto;
    position: relative;
    overflow: hidden;
}

/* === 2. Screen System === */
.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 10px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease;
    transform: translateY(20px);
}

.screen.active {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.hidden {
    display: none !important;
}

/* === 3. Main Menu === */
.menu-bg-stars {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(2px 2px at 20% 30%, rgba(255,255,255,0.4), transparent),
        radial-gradient(2px 2px at 40% 70%, rgba(255,255,255,0.3), transparent),
        radial-gradient(1px 1px at 60% 20%, rgba(255,255,255,0.5), transparent),
        radial-gradient(2px 2px at 80% 50%, rgba(255,255,255,0.3), transparent),
        radial-gradient(1px 1px at 10% 80%, rgba(255,255,255,0.4), transparent),
        radial-gradient(1px 1px at 90% 10%, rgba(255,255,255,0.3), transparent),
        radial-gradient(2px 2px at 50% 90%, rgba(255,255,255,0.2), transparent);
    animation: twinkle 4s ease-in-out infinite alternate;
}

@keyframes twinkle {
    0% { opacity: 0.6; }
    100% { opacity: 1; }
}

.menu-content {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    gap: 30px;
}

#menu-title {
    font-size: 48px;
    font-weight: 900;
    text-align: center;
    line-height: 1.1;
    letter-spacing: 4px;
    text-shadow: 0 4px 12px rgba(0,0,0,0.5), 0 0 40px rgba(255,255,255,0.1);
}

.title-letter {
    display: inline-block;
    animation: letterBounce 0.6s ease-out both;
    animation-delay: calc(var(--i) * 0.06s);
}

@keyframes letterBounce {
    0% { transform: translateY(-30px) scale(0.3); opacity: 0; }
    60% { transform: translateY(5px) scale(1.1); opacity: 1; }
    100% { transform: translateY(0) scale(1); }
}

/* 2x2 grid layout for mode buttons */
.menu-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    width: 85%;
    max-width: 320px;
}

.btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 20px;
    border: none;
    border-radius: 16px;
    font-size: 16px;
    font-weight: 700;
    color: #fff;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    text-align: left;
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 50%;
    background: linear-gradient(to bottom, rgba(255,255,255,0.15), transparent);
    border-radius: 16px 16px 0 0;
    pointer-events: none;
}

.btn:active {
    transform: scale(0.95);
}

.btn-icon {
    font-size: 28px;
    flex-shrink: 0;
}

.btn-label {
    font-size: 18px;
    letter-spacing: 2px;
}

.btn-desc {
    font-size: 11px;
    opacity: 0.7;
    font-weight: 400;
    display: block;
}

.btn-classic {
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    box-shadow: 0 4px 15px rgba(231,76,60,0.4);
}

.btn-adventure {
    background: linear-gradient(135deg, #2ecc71, #27ae60);
    box-shadow: 0 4px 15px rgba(46,204,113,0.4);
}

.btn-blast {
    background: linear-gradient(135deg, #3498db, #2980b9);
    box-shadow: 0 4px 15px rgba(52,152,219,0.4);
}

.btn-collect {
    background: linear-gradient(135deg, #9b59b6, #8e44ad);
    box-shadow: 0 4px 15px rgba(155,89,182,0.4);
}

/* Settings gear button */
.btn-icon-only {
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 50%;
    width: 48px;
    height: 48px;
    font-size: 22px;
    cursor: pointer;
    transition: transform 0.15s, background 0.15s;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
}

.btn-icon-only:active {
    transform: scale(0.9);
    background: rgba(255,255,255,0.2);
}

/* === 4. Level Select === */
.screen-header {
    display: flex;
    align-items: center;
    width: 100%;
    padding: 8px 0;
    flex-shrink: 0;
}

.screen-title {
    flex: 1;
    text-align: center;
    font-size: 22px;
    letter-spacing: 3px;
}

.spacer {
    width: 40px;
}

.btn-back {
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 12px;
    color: #fff;
    font-size: 20px;
    width: 40px;
    height: 40px;
    cursor: pointer;
    transition: transform 0.15s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-back:active {
    transform: scale(0.9);
}

#level-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 10px;
    width: 100%;
    max-width: 380px;
    padding: 20px 0;
    overflow-y: auto;
    flex: 1;
}

.level-btn {
    aspect-ratio: 1;
    border-radius: 14px;
    border: 2px solid rgba(255,255,255,0.15);
    background: rgba(255,255,255,0.08);
    color: #fff;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform 0.15s, background 0.15s;
    font-weight: 700;
    font-size: 18px;
    gap: 2px;
    position: relative;
}

.level-btn:active {
    transform: scale(0.92);
}

.level-btn.locked {
    opacity: 0.4;
    cursor: default;
    background: rgba(255,255,255,0.03);
}

.level-btn.completed {
    background: rgba(46,204,113,0.2);
    border-color: rgba(46,204,113,0.4);
}

.level-btn .level-stars-small {
    font-size: 10px;
    line-height: 1;
}

/* === 5. Options Screen === */
.options-list {
    width: 100%;
    max-width: 380px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 20px 0;
}

.option-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(255,255,255,0.06);
    border-radius: 14px;
    padding: 14px 18px;
}

.option-row-col {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
}

.option-label {
    font-size: 15px;
    font-weight: 600;
}

.option-note {
    font-size: 12px;
    opacity: 0.4;
    text-align: center;
    margin-top: 8px;
}

/* Toggle Switch */
.toggle {
    position: relative;
    width: 52px;
    height: 28px;
    flex-shrink: 0;
}

.toggle input {
    display: none;
}

.toggle-slider {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255,255,255,0.15);
    border-radius: 28px;
    cursor: pointer;
    transition: background 0.3s;
}

.toggle-slider::before {
    content: '';
    position: absolute;
    width: 22px;
    height: 22px;
    left: 3px;
    bottom: 3px;
    background: #fff;
    border-radius: 50%;
    transition: transform 0.3s;
}

.toggle input:checked + .toggle-slider {
    background: #2ecc71;
}

.toggle input:checked + .toggle-slider::before {
    transform: translateX(24px);
}

/* Segmented Control */
.seg-control {
    display: flex;
    gap: 0;
}

.seg-btn {
    background: rgba(255,255,255,0.08);
    padding: 6px 14px;
    font-size: 12px;
    font-weight: 600;
    color: rgba(255,255,255,0.6);
    border: 1px solid rgba(255,255,255,0.1);
    cursor: pointer;
    transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.seg-btn:first-child {
    border-radius: 8px 0 0 8px;
}

.seg-btn:last-child {
    border-radius: 0 8px 8px 0;
}

.seg-btn.active {
    background: rgba(52,152,219,0.4);
    color: #fff;
    border-color: rgba(52,152,219,0.5);
}

/* === 6. Game Header === */
#header {
    width: 100%;
    flex-shrink: 0;
}

#score-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    gap: 4px;
}

.score-box {
    background: rgba(255,255,255,0.08);
    border-radius: 12px;
    padding: 4px 12px;
    text-align: center;
    min-width: 70px;
}

.score-label {
    font-size: 9px;
    color: rgba(255,255,255,0.5);
    letter-spacing: 2px;
    font-weight: 600;
}

.score-value {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 1px;
}

.btn-back-game {
    width: 34px;
    height: 34px;
    font-size: 16px;
    border-radius: 10px;
    flex-shrink: 0;
}

.btn-pause {
    background: rgba(255,255,255,0.08);
    border: none;
    border-radius: 10px;
    width: 34px;
    height: 34px;
    font-size: 16px;
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.15s;
}

.btn-pause:active {
    transform: scale(0.9);
}

#mode-badge {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 2px;
    color: rgba(255,255,255,0.6);
    text-align: center;
    white-space: nowrap;
}

/* Objective Bar */
#objective-bar {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(255,215,0,0.1);
    border: 1px solid rgba(255,215,0,0.2);
    border-radius: 10px;
    padding: 5px 12px;
    margin-top: 4px;
    font-size: 12px;
    font-weight: 600;
}

#objective-icon {
    font-size: 14px;
}

#objective-text {
    flex: 1;
}

#objective-progress {
    color: #ffd700;
    font-weight: 700;
}

/* === 7. Collection Bar === */
#collection-bar {
    display: flex;
    gap: 6px;
    justify-content: center;
    flex-wrap: wrap;
    padding: 4px 0;
    margin-top: 4px;
}

.collect-item {
    display: flex;
    align-items: center;
    gap: 3px;
    background: rgba(255,255,255,0.06);
    border-radius: 8px;
    padding: 3px 8px;
    font-size: 11px;
    font-weight: 600;
}

.collect-item .ci-icon {
    font-size: 13px;
}

.collect-item .ci-count {
    color: #ffd700;
}

.collect-item.ci-done {
    background: rgba(46,204,113,0.2);
}

.ci-done .ci-count {
    color: #2ecc71;
}

/* === 8. Board === */
#board-wrapper {
    position: relative;
    width: 100%;
    aspect-ratio: 1 / 1;
    max-width: 400px;
    margin: 6px auto;
    flex-shrink: 0;
}

#board {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    grid-template-rows: repeat(8, 1fr);
    gap: 3px;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.3);
    border-radius: 14px;
    padding: 6px;
    box-shadow: inset 0 2px 10px rgba(0,0,0,0.3), 0 0 30px rgba(100,100,255,0.05);
}

/* === 9. Cell Styles === */
.cell {
    border-radius: 5px;
    background: rgba(255,255,255,0.04);
    position: relative;
    transition: transform 0.12s ease;
}

.cell.filled {
    border: 1px solid rgba(255,255,255,0.1);
    box-shadow: inset 0 2px 4px rgba(255,255,255,0.25), inset 0 -2px 4px rgba(0,0,0,0.25);
}

.cell.filled::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    right: 40%;
    bottom: 50%;
    background: rgba(255,255,255,0.2);
    border-radius: 3px 2px 6px 2px;
    pointer-events: none;
}

/* === 10. Block Colors (3-stop gradients at 145deg) === */
.color-red    { background: linear-gradient(145deg, #ff6b6b, #e74c3c, #c0392b); }
.color-blue   { background: linear-gradient(145deg, #74b9ff, #3498db, #2980b9); }
.color-green  { background: linear-gradient(145deg, #55efc4, #2ecc71, #27ae60); }
.color-yellow { background: linear-gradient(145deg, #ffeaa7, #f1c40f, #f39c12); }
.color-purple { background: linear-gradient(145deg, #d5aaff, #9b59b6, #8e44ad); }
.color-orange { background: linear-gradient(145deg, #ffbe76, #e67e22, #d35400); }
.color-cyan   { background: linear-gradient(145deg, #7efff5, #1abc9c, #16a085); }
.color-pink   { background: linear-gradient(145deg, #ff9ff3, #e91e8a, #c0147b); }
.color-indigo { background: linear-gradient(145deg, #a29bfe, #5c6bc0, #3f51b5); }
.color-teal   { background: linear-gradient(145deg, #66d9c2, #009688, #00796b); }
.color-lime   { background: linear-gradient(145deg, #c5f869, #8bc34a, #689f38); }

/* === 11. Cell Icon === */
.cell-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 11px;
    z-index: 2;
    pointer-events: none;
    filter: drop-shadow(0 1px 2px rgba(0,0,0,0.5));
    line-height: 1;
}

/* === 12. Target Blocks (Adventure Mode) === */
.cell.target-block::before {
    content: '\2B50';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 10px;
    animation: targetPulse 1.2s ease-in-out infinite;
    z-index: 2;
    filter: drop-shadow(0 0 3px rgba(255,215,0,0.8));
}

@keyframes targetPulse {
    0%, 100% { transform: translate(-50%, -50%) scale(0.8); opacity: 0.8; }
    50% { transform: translate(-50%, -50%) scale(1.2); opacity: 1; }
}

/* === 13. Ghost Layer & Highlight Layer === */
#ghost-layer, #highlight-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    grid-template-rows: repeat(8, 1fr);
    gap: 3px;
    padding: 6px;
    border-radius: 14px;
}

#ghost-layer .cell,
#highlight-layer .cell {
    background: transparent;
}

.ghost-cell-empty {
    background: transparent !important;
}

.cell.ghost {
    opacity: 0.6;
    border: 1px solid rgba(255,255,255,0.5);
    box-shadow: 0 0 6px 1px rgba(255,255,255,0.15);
    animation: ghostPulse 0.8s ease-in-out infinite;
}

@keyframes ghostPulse {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 0.6; }
}

.cell.ghost-invalid {
    background: rgba(255,60,60,0.3) !important;
    border: 1px dashed rgba(255,60,60,0.6);
}

/* Row/column completion highlight */
.cell.line-highlight {
    box-shadow: 0 0 12px 3px rgba(255,215,0,0.5);
    border: 1px solid rgba(255,215,0,0.6) !important;
    animation: lineGlow 0.5s ease-in-out infinite alternate;
}

@keyframes lineGlow {
    0% { box-shadow: 0 0 8px 2px rgba(255,215,0,0.3); }
    100% { box-shadow: 0 0 16px 4px rgba(255,215,0,0.6); }
}

/* === 14. Clear Animations === */
.cell.clearing {
    animation: rainbowClear 0.6s ease-out forwards;
}

@keyframes rainbowClear {
    0%   { filter: hue-rotate(0deg) brightness(1.5); transform: scale(1); }
    20%  { filter: hue-rotate(72deg) brightness(2); transform: scale(1.25); }
    40%  { filter: hue-rotate(144deg) brightness(2); transform: scale(1.1); }
    60%  { filter: hue-rotate(216deg) brightness(1.8); transform: scale(1.3); }
    80%  { filter: hue-rotate(288deg) brightness(1.5); transform: scale(0.5); opacity: 0.5; }
    100% { filter: hue-rotate(360deg) brightness(0); transform: scale(0); opacity: 0; }
}

.reduced-motion .cell.clearing {
    animation: simpleClear 0.3s ease-out forwards;
}

@keyframes simpleClear {
    0%   { opacity: 1; transform: scale(1); }
    100% { opacity: 0; transform: scale(0.8); }
}

.cell.flash {
    animation: flashBright 0.2s ease-in-out;
}

@keyframes flashBright {
    0%   { filter: brightness(1); }
    50%  { filter: brightness(2.5); }
    100% { filter: brightness(1); }
}

.cell.placed-pop {
    animation: placePop 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes placePop {
    0%   { transform: scale(0.5); }
    50%  { transform: scale(1.15); }
    100% { transform: scale(1); }
}

/* === 15. Particles === */
#particle-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
    border-radius: 14px;
}

.particle {
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
    animation: particleFly var(--duration, 0.8s) ease-out forwards;
}

@keyframes particleFly {
    0%   { transform: translate(0, 0) scale(1); opacity: 1; }
    100% { transform: translate(var(--tx, 0px), var(--ty, -60px)) scale(0); opacity: 0; }
}

.sparkle {
    position: absolute;
    pointer-events: none;
    font-size: 14px;
    animation: sparkleFly 0.8s ease-out forwards;
}

@keyframes sparkleFly {
    0%   { transform: translate(0, 0) scale(0.5) rotate(0deg); opacity: 1; }
    100% { transform: translate(var(--tx, 20px), var(--ty, -40px)) scale(1.2) rotate(180deg); opacity: 0; }
}

/* === 16. Screen Shake === */
.screen-shake {
    animation: shake 0.3s ease-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25%  { transform: translateX(-4px) translateY(2px); }
    50%  { transform: translateX(4px) translateY(-2px); }
    75%  { transform: translateX(-2px) translateY(1px); }
}

/* === 17. Pieces Tray === */
#pieces-tray {
    display: flex;
    justify-content: space-around;
    align-items: center;
    width: 100%;
    max-width: 400px;
    flex: 1;
    min-height: 70px;
    padding: 4px 0;
}

.piece-slot {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 30%;
    height: 100%;
    position: relative;
}

.piece-preview {
    display: inline-grid;
    gap: 2px;
    cursor: grab;
    transition: transform 0.15s ease, opacity 0.15s ease;
    touch-action: none;
}

.piece-preview:active {
    cursor: grabbing;
}

.piece-preview.dragging {
    opacity: 0.25;
    transform: scale(0.8);
}

.piece-cell {
    width: 16px;
    height: 16px;
    border-radius: 4px;
}

.piece-cell:not(.empty) {
    border: 1px solid rgba(255,255,255,0.15);
    box-shadow: inset 0 1px 2px rgba(255,255,255,0.2), inset 0 -1px 2px rgba(0,0,0,0.2);
}

.piece-cell.empty {
    background: transparent !important;
    border: none;
    box-shadow: none;
}

.piece-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 9px;
    z-index: 2;
    pointer-events: none;
    filter: drop-shadow(0 1px 2px rgba(0,0,0,0.5));
    line-height: 1;
}

/* Drag Piece */
#drag-piece {
    position: fixed;
    pointer-events: none;
    z-index: 1000;
    display: inline-grid;
    gap: 3px;
    opacity: 0.9;
    filter: drop-shadow(0 4px 12px rgba(0,0,0,0.4));
}

#drag-piece .piece-cell {
    border-radius: 5px;
    border: 1px solid rgba(255,255,255,0.2);
    box-shadow: inset 0 2px 4px rgba(255,255,255,0.25), inset 0 -2px 4px rgba(0,0,0,0.25);
}

/* === 18. Score Popup === */
.score-popup {
    position: absolute;
    font-size: 24px;
    font-weight: 900;
    pointer-events: none;
    z-index: 200;
    background: linear-gradient(90deg, #ffd700, #ff6b6b);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.5));
    animation: scoreFloat 1s ease-out forwards;
}

@keyframes scoreFloat {
    0%   { transform: translateY(0) scale(0.5); opacity: 0; }
    20%  { transform: translateY(-10px) scale(1.2); opacity: 1; }
    100% { transform: translateY(-70px) scale(0.8); opacity: 0; }
}

/* === 19. Combo Display === */
#combo-display {
    position: absolute;
    top: 80px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 100;
    pointer-events: none;
}

#combo-text {
    font-size: 32px;
    font-weight: 900;
    letter-spacing: 2px;
    background: linear-gradient(90deg, #ff6b6b, #ffd700, #51cf66, #339af0, #cc5de8);
    background-size: 200% 100%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 2px 6px rgba(0,0,0,0.5));
    animation: comboPopIn 0.4s ease-out, rainbowShift 1s linear infinite;
}

@keyframes comboPopIn {
    0%   { transform: scale(0.3); opacity: 0; }
    60%  { transform: scale(1.3); opacity: 1; }
    100% { transform: scale(1); }
}

@keyframes rainbowShift {
    0%   { background-position: 0% 50%; }
    100% { background-position: 200% 50%; }
}

/* === 20. Overlays === */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.75);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 500;
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

.overlay-modal {
    background: linear-gradient(145deg, #2a2a4a, #1a1a2e);
    border-radius: 24px;
    padding: 35px 45px;
    text-align: center;
    border: 1px solid rgba(255,255,255,0.1);
    box-shadow: 0 20px 60px rgba(0,0,0,0.5), 0 0 40px rgba(100,100,255,0.1);
    animation: modalSlideUp 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    max-width: 90%;
}

@keyframes modalSlideUp {
    from { transform: translateY(50px) scale(0.9); opacity: 0; }
    to   { transform: translateY(0) scale(1); }
}

.overlay-modal h2 {
    font-size: 28px;
    letter-spacing: 4px;
    margin-bottom: 15px;
}

.final-score-label {
    font-size: 11px;
    color: rgba(255,255,255,0.5);
    letter-spacing: 3px;
}

.final-score {
    font-size: 48px;
    font-weight: 900;
    color: #ffd700;
    margin-bottom: 8px;
}

.new-best {
    font-size: 16px;
    color: #ffd700;
    letter-spacing: 2px;
    margin-bottom: 8px;
    animation: pulse 1s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50%      { opacity: 0.7; transform: scale(1.05); }
}

.overlay-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 15px;
}

.btn-play-again {
    background: linear-gradient(135deg, #2ecc71, #27ae60);
    box-shadow: 0 4px 15px rgba(46,204,113,0.4);
    padding: 14px 40px;
    border-radius: 14px;
    font-size: 16px;
    letter-spacing: 2px;
    justify-content: center;
}

.btn-next-level {
    background: linear-gradient(135deg, #3498db, #2980b9);
    box-shadow: 0 4px 15px rgba(52,152,219,0.4);
    padding: 14px 40px;
    border-radius: 14px;
    font-size: 16px;
    letter-spacing: 2px;
    justify-content: center;
}

.btn-menu {
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.15);
    padding: 12px 30px;
    border-radius: 14px;
    font-size: 14px;
    letter-spacing: 2px;
    justify-content: center;
}

/* Level Complete Stars */
.level-stars {
    font-size: 40px;
    margin: 10px 0;
    display: flex;
    gap: 8px;
    justify-content: center;
}

.star {
    transition: transform 0.3s;
    filter: grayscale(1) opacity(0.3);
}

.star.earned {
    filter: none;
    color: #ffd700;
    animation: starEarned 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

@keyframes starEarned {
    0%   { transform: scale(0) rotate(-180deg); }
    100% { transform: scale(1) rotate(0deg); }
}

/* Timer Urgent (Blast Mode) */
.timer-urgent {
    color: #e74c3c !important;
    animation: timerFlash 0.5s ease-in-out infinite;
}

@keyframes timerFlash {
    0%, 100% { opacity: 1; }
    50%      { opacity: 0.4; }
}

/* === 21. Responsive === */
@media (max-height: 700px) {
    #game-screen {
        padding: 4px 8px;
    }
    .score-box {
        padding: 3px 8px;
        min-width: 60px;
    }
    .score-value {
        font-size: 17px;
    }
    .piece-cell {
        width: 13px;
        height: 13px;
    }
    #board-wrapper {
        margin: 3px auto;
    }
    #combo-text {
        font-size: 26px;
    }
    .overlay-modal {
        padding: 25px 35px;
    }
    .overlay-modal h2 {
        font-size: 22px;
    }
    .final-score {
        font-size: 36px;
    }
    #menu-title {
        font-size: 38px;
    }
}

@media (max-height: 600px) {
    .piece-cell {
        width: 11px;
        height: 11px;
    }
    .score-value {
        font-size: 15px;
    }
    .score-label {
        font-size: 8px;
    }
    #menu-title {
        font-size: 32px;
    }
    .btn {
        padding: 10px 16px;
    }
    .btn-label {
        font-size: 15px;
    }
}

@media (min-width: 500px) {
    .piece-cell {
        width: 18px;
        height: 18px;
    }
}