* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    background-color: #000; /* Black background to make window pop */
    font-family: Arial, sans-serif;
    display: flex; justify-content: center; align-items: center; min-height: 100vh; flex-direction: column;
}

.os-window {
    width: 750px;
    min-height: 700px; height: auto; padding-bottom: 5px;
    background: #e8eaec;
    border: 1px solid #737373;
    border-radius: 6px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.5);
    display: flex; flex-direction: column;
}

/* OS Title Bar (Windows Classic style) */
.os-title-bar {
    height: 30px;
    background: linear-gradient(to bottom, #f0f0f0, #d9d9d9);
    border-bottom: 1px solid #aaa;
    border-radius: 5px 5px 0 0;
    display: flex; justify-content: space-between; align-items: center;
    padding: 0 5px;
}
.os-title-left { display: flex; align-items: center; gap: 5px; }
.os-icon { width: 16px; height: 16px; }
.os-title { font-size: 13px; color: #000; }
.os-title-right { display: flex; gap: 2px; }
.os-btn {
    width: 28px; height: 20px;
    background: linear-gradient(to bottom, #fff, #e0e0e0);
    border: 1px solid #999; border-radius: 3px;
    display: flex; justify-content: center; align-items: center;
    font-size: 14px; cursor: pointer;
}
.os-btn:active { background: #ccc; box-shadow: inset 1px 1px 2px rgba(0,0,0,0.2); }

/* Installer Container */
.installer-container {
    flex: 1; display: flex; flex-direction: column;
    padding: 15px 15px 0 15px;
}

.installer-inner {
    flex: 1; display: flex;
    background: #fff;
    border: 2px solid #b7cde5;
    border-radius: 15px;
    box-shadow: inset 0 0 5px rgba(0,0,0,0.05);
    overflow: hidden;
}

/* Left Sidebar */
.sidebar {
    width: 230px;
    display: flex; flex-direction: column; align-items: center;
    padding-top: 20px;
}
.logo {
    width: 130px; margin-bottom: 25px;
}

.sneak-peek-area {
    display: flex; flex-direction: column; align-items: center;
}
.sneak-peek-frame {
    width: 125px; height: 170px;
    border: 2px solid #fff; border-radius: 12px;
    box-shadow: 0 0 0 1px #ccc, 0 3px 5px rgba(0,0,0,0.2);
    overflow: hidden; margin-bottom: 10px;
}
.sneak-peek-frame img { width: 100%; height: 100%; object-fit: cover; }
.sneak-controls { display: flex; gap: 10px; margin-bottom: 8px; }
.arr-btn {
    width: 25px; height: 18px;
    background: linear-gradient(to bottom, #fff, #f0f0f0);
    border: 1px solid #a4c0db; border-radius: 9px;
    color: #4A73A6; font-size: 12px; cursor: pointer;
}
.arr-btn:active { background: #e0e8f0; }
.sneak-text {
    text-align: center; color: #4A73A6; font-size: 12px; font-weight: bold;
}

/* Right Content Area */
.main-content {
    flex: 1;
    background: #e9f0f9; /* Very light blue background */
    border-left: 2px solid #b7cde5;
    display: flex; flex-direction: column;
}

/* Header */
.game-header {
    height: 140px;
    border-bottom: 1px solid #b7cde5;
    display: flex;
}
.title-column {
    flex: 1; padding: 15px;
}
.title-column h2 {
    color: #4A73A6; font-size: 22px; line-height: 1.1; font-weight: bold;
}

.stats-column {
    display: flex; align-items: center; padding-right: 15px; gap: 15px;
}
.clock-container {
    position: relative;
    width: 130px; height: 130px;
    background: #fff;
    border: 3px solid #85a4ce;
    border-radius: 50%;
    display: flex; justify-content: center; align-items: center;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.1);
}
.clock-outer {
    width: 110px; height: 110px;
    border: 6px dashed #9bc45c; /* green dashed ring */
    border-radius: 50%;
    display: flex; justify-content: center; align-items: center;
}
.clock-inner {
    width: 90px; height: 90px; position: relative;
}
.clock-hand {
    position: absolute; bottom: 50%; left: 50%;
    width: 4px; height: 40px; background: #264a7f;
    transform-origin: bottom center;
}

/* Pause Button Next to Clock */
.pause-btn-container {
    position: absolute;
    left: -42px;
    top: 50%;
    transform: translateY(-50%);
    width: 40px; height: 40px;
    background: linear-gradient(to bottom, #fff, #d0e0cd);
    border: 2px solid #85a4ce;
    border-radius: 50%;
    display: flex; justify-content: center; align-items: center;
    cursor: pointer;
    box-shadow: 1px 1px 3px rgba(0,0,0,0.2);
    z-index: 10;
}
.pause-btn-container:hover { background: #fff; }
.pause-icon {
    width: 6px; height: 10px;
    border-left: 2px solid #4a73a6;
    border-right: 2px solid #4a73a6;
}
.play-icon {
    width: 0; height: 0;
    border-top: 5px solid transparent;
    border-bottom: 5px solid transparent;
    border-left: 8px solid #4a73a6;
    margin-left: 2px;
    display: none;
}
.is-paused .pause-icon { display: none; }
.is-paused .play-icon { display: block; }

.scores-panel {
    display: flex; flex-direction: column; justify-content: center;
    border-left: 1px solid #b7cde5; padding-left: 15px; height: 70px;
}
.score-row {
    font-size: 11px; display: flex; align-items: center; gap: 5px; line-height: 1.3;
}
.score-val {
    color: #81b43f; font-weight: bold; font-family: 'Courier New', Courier, monospace; font-size: 13px;
    width: 25px; text-align: right;
}
.last-score-row { border-top: 1px solid #b7cde5; margin-top: 2px; padding-top: 2px; }
.last-val { color: transparent; } /* Invisible until set */
.score-label { color: #4A73A6; }

/* Screens Container */
.screens-container {
    flex: 1; position: relative; background: #e9f0f9; border-radius: 0 0 13px 0;
    overflow: hidden; padding: 10px;
}
.screen {
    position: absolute; inset: 10px;
    background: #fff;
    border: 2px solid #b7cde5;
    border-radius: 12px;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    overflow: hidden;
    transition: opacity 0.2s;
}
.screen.hidden { opacity: 0; pointer-events: none; z-index: -1; }
.screen.active { opacity: 1; z-index: 1; }

.text-screen { text-align: center; overflow-y: auto; max-height: 100%; padding: 15px; }
.text-screen p { color: #4A73A6; font-size: 11px; line-height: 1.2; margin-bottom: 8px; }
.text-screen p.intro-text { font-size: 13px; margin-bottom: 4px; font-weight: bold; }

.divider { height: 1px; background: #4A73A6; width: 90%; margin: 8px auto; }

/* Buttons */
.action-btn {
    margin-top: 15px; margin-bottom: 15px; padding: 5px 25px;
    background: linear-gradient(to bottom, #fff, #e4eedb);
    border: 2px solid #a3c482; border-radius: 15px;
    color: #4A73A6; font-size: 14px; cursor: pointer;
    box-shadow: 1px 1px 3px rgba(0,0,0,0.1);
}
.action-btn:hover { background: linear-gradient(to bottom, #fff, #d2e4c2); border-color: #81b43f; }

/* Memory Board */
.memory-grid {
    display: grid; 
    grid-template-columns: repeat(4, 85px); 
    grid-template-rows: repeat(4, 85px);
    gap: 15px; 
    width: 100%; 
    height: 100%; 
    padding: 15px;
    justify-content: center;
    align-content: center;
}
.mem-card {
    background: transparent;
    position: relative; cursor: pointer; perspective: 1000px;
    width: 85px; height: 85px; margin: auto;
    display: flex; justify-content: center; align-items: center;
    transform-style: preserve-3d;
}
.mem-front, .mem-back {
    position: absolute;
    width: 85px;
    height: 85px;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden; 
    transition: transform 0.3s ease-out;
    border-radius: 50%;
    overflow: hidden;
    will-change: transform;
}
.mem-back {
    background: radial-gradient(circle at 35% 30%, #f6ffdc, #b2db6e 65%);
    box-shadow: inset -4px -5px 10px rgba(0,0,0,0.15), inset 3px 4px 10px rgba(255,255,255,1), 1px 2px 4px rgba(0,0,0,0.25);
    border: 4px solid #fff;
    box-sizing: border-box;
    position: relative;
}
.mem-back::after {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: url('assets/plumbob_trans.png') center/50% no-repeat;
    opacity: 0;
    transition: opacity 0.3s ease;
}
.mem-card:hover:not(.flipped):not(.matched) .mem-back::after {
    opacity: 0.85;
}
.mem-front {
    transform: rotateY(180deg) translateZ(1px);
    border: 2px solid #b7cde5;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-color: #fff;
    box-shadow: 1px 2px 4px rgba(0,0,0,0.2);
}
.mem-card.flipped .mem-back { transform: rotateY(180deg) translateZ(-1px); }
.mem-card.flipped .mem-front { transform: rotateY(0deg) translateZ(0); }
.mem-card.matched {
    visibility: hidden;
    pointer-events: none;
}

/* Trivia */
.trivia-q { color: #4A73A6; margin-bottom: 20px; font-size: 15px; }
.trivia-opts { display: flex; flex-direction: column; gap: 8px; width: 100%; max-width: 250px; }
.opt-btn { padding: 8px; border: 1px solid #b7cde5; background: #fff; color: #4A73A6; border-radius: 8px; cursor: pointer; }
.opt-btn:hover { background: #f1f6fc; }

/* Footer */
.installer-footer {
    height: 30px; display: flex; justify-content: center; align-items: center; gap: 10px;
    padding-bottom: 5px;
}
.progress-dots { display: flex; gap: 4px; }
.dot { width: 7px; height: 7px; border-radius: 50%; background: #aaa; }
.dot.active { background: #777; }
.progress-text { color: #888; font-size: 11px; font-weight: bold; }
/* =========================================
   RESPONSIVE LAYOUT & LEADERBOARD & ADS
========================================= */

.app-container {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    gap: 20px;
    width: 100%;
    max-width: 1200px;
    padding: 20px;
}

/* LEADERBOARD PANEL */
.leaderboard-panel {
    width: 300px;
    background: #eef3f9;
    border: 3px solid #b7cde5;
    border-radius: 12px;
    padding: 15px;
    font-family: Arial, sans-serif;
    color: #4A73A6;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}
.leaderboard-panel h2 {
    text-align: center;
    margin-bottom: 15px;
    font-size: 20px;
    color: #264a7f;
}
.rank-section {
    margin-bottom: 20px;
    background: #fff;
    border-radius: 8px;
    border: 1px solid #b7cde5;
    overflow: hidden;
}
.rank-section h3 {
    padding: 8px;
    font-size: 14px;
    text-align: center;
    color: #fff;
}
.best-title { background: #85a4ce; }
.worst-title { background: #e57373; } /* subtle red for worst */
.rank-table-header, .rank-row {
    display: flex;
    padding: 5px 8px;
    font-size: 12px;
    border-bottom: 1px solid #eee;
}
.rank-table-header {
    background: #f1f6fc;
    font-weight: bold;
}
.rank-row:last-child { border-bottom: none; }
.rank-table-header span, .rank-row span { flex: 1; text-align: center; }
.rank-table-header span:first-child, .rank-row span:first-child { flex: 2; text-align: left; }

/* AD OVERLAY */
#ad-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.9);
    z-index: 9999;
    display: flex; justify-content: center; align-items: center;
    color: #fff; font-family: Arial, sans-serif;
}
.ad-content {
    background: #111;
    padding: 30px;
    border-radius: 12px;
    border: 2px solid #9bc45c;
    text-align: center;
    width: 90%; max-width: 500px;
}
.ad-video-placeholder {
    width: 100%; height: 250px;
    background: #333;
    display: flex; justify-content: center; align-items: center;
    margin: 20px 0;
    border-radius: 8px;
    border: 1px solid #555;
}
#btn-skip-ad {
    background: #85a4ce; color: #fff;
    border: none; padding: 10px 20px;
    border-radius: 20px; font-size: 16px; font-weight: bold;
    cursor: pointer; transition: background 0.3s;
}
#btn-skip-ad:disabled { background: #555; cursor: not-allowed; color: #888; }
#btn-skip-ad:not(:disabled):hover { background: #9bc45c; }

/* MOBILE RESPONSIVENESS */
@media (max-width: 1100px) {
    .app-container {
        flex-direction: column;
        align-items: center;
    }
    .leaderboard-panel { width: 100%; max-width: 750px; }
}
@media (max-width: 780px) {
    body { align-items: flex-start; padding: 10px; }
    .os-window { width: 100%; height: auto; min-min-height: 700px; height: auto; padding-bottom: 5px; }
    .game-content { flex-direction: column; }
    .sidebar { width: 100%; border-right: none; border-bottom: 1px solid #b7cde5; padding: 10px; flex-direction: row; justify-content: space-around; }
    .sidebar img#logo { display: none; } /* Hide logo to save space */
    .sneak-peek-area { transform: scale(0.7); transform-origin: top center; }
    .game-header { flex-direction: column; height: auto; padding-bottom: 10px; }
    .stats-column { padding-top: 10px; }
    .memory-grid { gap: 5px; grid-template-columns: repeat(4, 65px); grid-template-rows: repeat(4, 65px); }
    .mem-front, .mem-back { width: 65px; height: 65px; }
    .mem-card { width: 65px; height: 65px; }
}

/* =========================================
   BACK TO HOME BUTTON (SPINNING PLUMBOB)
========================================= */
.back-home-btn {
    position: absolute;
    top: 20px;
    left: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.9);
    padding: 8px 15px;
    border-radius: 25px;
    text-decoration: none;
    color: #264a7f;
    font-weight: bold;
    font-size: 14px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
    border: 2px solid #85a4ce;
    z-index: 100;
    transition: transform 0.2s, background 0.2s;
}
.back-home-btn:hover {
    transform: scale(1.05);
    background: #fff;
}
.spin-plumbob {
    width: 20px;
    height: 20px;
    animation: spin 3s linear infinite;
}
@keyframes spin {
    0% { transform: rotateY(0deg); }
    100% { transform: rotateY(360deg); }
}

@media (max-width: 780px) {
    .back-home-btn {
        position: static;
        margin-bottom: 10px;
        align-self: flex-start;
    }
}

/* =========================================
   TOP BAR & CLEAN ADS
========================================= */
.top-bar {
    width: 100%;
    max-width: 1200px;
    padding: 20px 20px 0 20px;
    display: flex;
    justify-content: flex-start;
    align-items: center;
}
.back-home-btn {
    position: static; /* Override absolute */
    display: flex;
    align-items: center;
    gap: 8px;
    background: #fff;
    padding: 8px 20px;
    border-radius: 25px;
    text-decoration: none;
    color: #264a7f;
    font-weight: bold;
    font-size: 15px;
    box-shadow: 0 4px 10px rgba(255,255,255,0.2);
    border: 2px solid #85a4ce;
    transition: transform 0.2s, box-shadow 0.2s;
}
.back-home-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(255,255,255,0.4);
}
.side-ad-panel {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 160px;
}

/* BOTTOM ADS PANEL */
.bottom-ad-panel {
    width: 100%;
    margin-top: 30px;
    padding: 20px;
    background: transparent;
    display: flex;
    flex-direction: column;
    align-items: center;
}
.leaderboard-panel {
    background: #f1f6fc;
    border: 2px solid #b7cde5;
    border-radius: 8px;
    padding: 15px;
    width: 250px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.5);
    font-family: Arial, sans-serif;
}
.rank-table-header {
    display: flex;
    justify-content: space-between;
    font-size: 11px;
    font-weight: bold;
    color: #fff;
    padding: 5px;
    background: #85a4ce;
    border-radius: 4px;
    margin-bottom: 5px;
}
.rank-list {
    font-size: 11px;
    color: #444;
}
.rank-item {
    display: flex;
    justify-content: space-between;
    padding: 4px;
    border-bottom: 1px solid #ddd;
}
.best-title {
    background: #85a4ce;
    color: #fff;
    text-align: center;
    padding: 5px;
    border-radius: 4px;
    margin-bottom: 10px;
}
.worst-title {
    background: #e57373;
    color: #fff;
    text-align: center;
    padding: 5px;
    border-radius: 4px;
    margin-bottom: 10px;
}

#sneak-track img { width: 125px; height: 100%; object-fit: cover; flex-shrink: 0; }