:root {
    --bg: #f5efe2;
    --surface: #ffffff;
    --surface-alt: #fbf7ed;
    --text: #2c3338;
    --text-muted: #6b7480;
    --accent: #7a9b85;
    --accent-hover: #698c75;
    --accent-soft: #c5d6cb;
    --warm: #c7a888;
    --warm-soft: #e6d4bb;
    --pop: #e85d4a;
    --pop-hover: #d44a37;
    --border: #e8e2d4;
    --shadow: 0 2px 8px rgba(60, 50, 30, 0.08);
    --shadow-hover: 0 6px 20px rgba(60, 50, 30, 0.12);
    --radius: 12px;
}

/* Dark theme — system preference (unless light forced) */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg: #0f1913;
        --surface: #162019;
        --surface-alt: #121b16;
        --text: #dce9de;
        --text-muted: #7a9486;
        --accent: #5a9470;
        --accent-hover: #6ca882;
        --accent-soft: #1c3226;
        --warm: #c8a870;
        --warm-soft: #2a2014;
        --pop: #e8725e;
        --pop-hover: #f08070;
        --border: #1c2e22;
        --shadow: 0 2px 8px rgba(0, 0, 0, 0.35);
        --shadow-hover: 0 6px 20px rgba(0, 0, 0, 0.45);
        --logo-glyph: #c8a870;
    }
}

/* Dark theme — explicitly chosen */
:root[data-theme="dark"] {
    --bg: #0f1913;
    --surface: #162019;
    --surface-alt: #121b16;
    --text: #dce9de;
    --text-muted: #7a9486;
    --accent: #5a9470;
    --accent-hover: #6ca882;
    --accent-soft: #1c3226;
    --warm: #c8a870;
    --warm-soft: #2a2014;
    --pop: #e8725e;
    --pop-hover: #f08070;
    --border: #1c2e22;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.35);
    --shadow-hover: 0 6px 20px rgba(0, 0, 0, 0.45);
    --logo-glyph: #c8a870;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
                 Helvetica, Arial, sans-serif;
    color: var(--text);
    background: var(--bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

main { flex: 1; }

.topbar {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}
.topbar .logo {
    font-weight: 600;
    font-size: 1.05rem;
    color: var(--pop);
    text-decoration: none;
    letter-spacing: 0.02em;
}
.topbar .logo::before {
    content: "◆";
    color: var(--logo-glyph, var(--pop));
    margin-right: 0.4rem;
}
.topbar .game-title {
    color: var(--text-muted);
    font-size: 0.95rem;
    font-weight: 400;
    margin: 0;
    letter-spacing: normal;
}
.topbar .back {
    color: var(--pop);
    text-decoration: none;
    font-size: 0.9rem;
}
.topbar .back:hover { color: var(--pop-hover); }

.theme-toggle {
    margin-left: auto;
    display: flex;
    background: var(--surface-alt);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 2px;
    gap: 2px;
}
.theme-toggle button {
    background: transparent;
    color: var(--text-muted);
    border: none;
    padding: 0.22rem 0.5rem;
    border-radius: 6px;
    font-size: 0.88rem;
    cursor: pointer;
    line-height: 1;
    transition: background 0.12s, color 0.12s;
    transform: none !important;
}
.theme-toggle button:hover {
    background: var(--border);
    color: var(--text);
}
.theme-toggle button.active {
    background: var(--surface);
    color: var(--text);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.14);
}

button, .btn {
    font: inherit;
    background: var(--accent);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.15s ease, transform 0.05s ease;
}
button:hover, .btn:hover { background: var(--accent-hover); }
button:active, .btn:active { transform: translateY(1px); }
button.ghost {
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--accent-soft);
}
button.ghost:hover { background: var(--accent-soft); color: var(--text); }

.ad-banner {
    display: none;
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: 0.5rem;
    justify-content: center;
    align-items: center;
}
body.ads-enabled .ad-banner { display: flex; }
.ad-slot {
    width: 100%;
    max-width: 728px;
    height: 90px;
    background: var(--surface-alt);
    border: 2px solid var(--border);
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0 1rem;
    color: var(--text-muted);
    overflow: hidden;
    position: relative;
}
.ad-slot::before {
    content: "AD";
    position: absolute;
    top: 6px;
    right: 8px;
    font-size: 0.55rem;
    letter-spacing: 0.15em;
    color: var(--text-muted);
    background: var(--surface);
    padding: 1px 5px;
    border-radius: 3px;
    border: 1px solid var(--border);
    font-weight: 600;
}
.ad-mock-logo {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--accent-soft), var(--warm-soft));
    border-radius: 8px;
    flex-shrink: 0;
    display: grid;
    place-items: center;
    color: var(--accent);
    font-size: 1.6rem;
}
.ad-mock-text {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.ad-mock-text strong {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text);
}
.ad-mock-text span {
    font-size: 0.78rem;
    color: var(--text-muted);
}
.ad-mock-cta {
    background: var(--accent);
    color: white;
    padding: 0.55rem 1.1rem;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 500;
    flex-shrink: 0;
}
@media (max-width: 768px) {
    body.ads-enabled .ad-banner {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        z-index: 100;
        padding: 0.4rem;
        box-shadow: 0 -2px 8px rgba(60, 50, 30, 0.06);
    }
    body.ads-enabled { padding-bottom: 110px; }
}
@media (max-width: 480px) {
    body.ads-enabled { padding-bottom: 80px; }
    .ad-slot { height: 60px; gap: 0.5rem; padding: 0 0.5rem; }
    .ad-slot::before { font-size: 0.5rem; padding: 1px 4px; top: 4px; right: 6px; }
    .ad-mock-logo { width: 40px; height: 40px; font-size: 1.1rem; }
    .ad-mock-text strong { font-size: 0.78rem; }
    .ad-mock-text span { font-size: 0.65rem; }
    .ad-mock-cta { padding: 0.4rem 0.7rem; font-size: 0.75rem; }
}

.game-shell {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1rem;
    gap: 1rem;
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
}
.game-info {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
    justify-content: center;
}
.game-info .stat {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.4rem 0.8rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}
.game-info .stat b {
    color: var(--text);
    margin-left: 0.3rem;
    font-weight: 500;
}
.panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1rem;
}
.help {
    color: var(--text-muted);
    font-size: 0.85rem;
    text-align: center;
    max-width: 460px;
    line-height: 1.45;
}

.about {
    max-width: 720px;
    margin: 2.5rem auto 1.5rem;
    padding: 0 1.25rem;
    color: var(--text-muted);
    font-size: 0.92rem;
    line-height: 1.6;
}
.about h2 {
    color: var(--text);
    font-size: 1.1rem;
    font-weight: 500;
    margin: 0 0 0.7rem;
}
.about p {
    margin: 0 0 0.8rem;
}
.about p:last-child {
    margin-bottom: 0;
}