.ss-app {
    --ss-bg: #0f172a;
    --ss-panel: #172033;
    --ss-board: #091120;
    --ss-cyan: #22d3ee;
    --ss-purple: #a78bfa;
    --ss-green: #34d399;
    --ss-red: #fb7185;
    --ss-amber: #fbbf24;
    --ss-text: #f8fafc;
    --ss-muted: #e2e8f0;
    width: 100%;
    max-width: 760px;
    margin: 18px auto;
    color: var(--ss-text);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.4;
    box-sizing: border-box;
}

.ss-app *, .ss-app *::before, .ss-app *::after { box-sizing: border-box; }

.ss-shell {
    position: relative;
    overflow: hidden;
    padding: clamp(14px, 2.6vw, 24px);
    border: 1px solid rgba(148, 163, 184, 0.22);
    border-radius: 22px;
    background:
        radial-gradient(circle at 10% 0%, rgba(34, 211, 238, 0.13), transparent 34%),
        radial-gradient(circle at 90% 5%, rgba(167, 139, 250, 0.14), transparent 32%),
        var(--ss-bg);
    box-shadow: 0 22px 70px rgba(2, 6, 23, 0.46);
}

.ss-header { display: flex; justify-content: space-between; align-items: flex-start; gap: 14px; margin-bottom: 14px; }
.ss-title { margin: 0 !important; padding: 0 !important; border: 0 !important; color: #ffffff !important; font: 800 clamp(1.25rem, 4vw, 1.8rem)/1.05 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; letter-spacing: .04em; text-shadow: 0 0 20px rgba(34, 211, 238, .72); }
.ss-subtitle { margin: 5px 0 0 !important; color: #e2e8f0 !important; font-size: .92rem; font-weight: 650; }
.ss-header-actions { display: flex; gap: 8px; }
.ss-icon-button { width: 42px; height: 42px; display: grid; place-items: center; border: 1px solid rgba(148,163,184,.28); border-radius: 12px; background: rgba(15,23,42,.72); color: var(--ss-text); cursor: pointer; font-size: 1.15rem; }
.ss-icon-button:hover, .ss-icon-button:focus-visible { border-color: var(--ss-cyan); outline: none; transform: translateY(-1px); }

.ss-stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 9px; margin-bottom: 12px; }
.ss-stat { min-width: 0; padding: 9px 10px; border: 1px solid rgba(148,163,184,.15); border-radius: 12px; background: rgba(255,255,255,.045); text-align: center; }
.ss-stat span { display: block; color: #e2e8f0 !important; font-size: .67rem; font-weight: 800; letter-spacing: .11em; text-transform: uppercase; }
.ss-stat strong { display: block; margin-top: 2px; color: var(--ss-text); font: 800 1.08rem/1.2 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.ss-lives-stat strong { color: var(--ss-red); letter-spacing: .08em; }

.ss-question-panel { min-height: 90px; display: flex; flex-direction: column; justify-content: center; gap: 5px; margin-bottom: 12px; padding: 14px 16px; border: 1px solid rgba(34,211,238,.24); border-radius: 15px; background: rgba(34,211,238,.06); }
.ss-question-label { color: #67e8f9 !important; font-size: .68rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.ss-question { margin: 0 !important; color: #ffffff !important; font-size: clamp(.98rem, 2.4vw, 1.12rem); font-weight: 700; }

.ss-game-wrap { position: relative; width: 100%; padding: 10px; border-radius: 17px; background: linear-gradient(145deg, rgba(34,211,238,.12), rgba(167,139,250,.1)); box-shadow: inset 0 0 0 1px rgba(148,163,184,.15); touch-action: none; }
.ss-canvas { width: 100%; height: auto; aspect-ratio: 1 / 1; display: block; border-radius: 12px; background: var(--ss-board); box-shadow: inset 0 0 36px rgba(0,0,0,.55); image-rendering: auto; }

.ss-overlay { position: absolute; inset: 10px; z-index: 10; display: grid; place-items: center; padding: 20px; border-radius: 12px; background: rgba(9,17,32,.94); backdrop-filter: blur(7px); overflow: auto; }
.ss-overlay[hidden] { display: none !important; }
.ss-overlay-card { width: min(100%, 510px); text-align: center; }
.ss-overlay-card h3 { margin: 4px 0 15px !important; color: #ffffff !important; font-size: clamp(1.35rem, 4vw, 2rem); line-height: 1.15; }
.ss-overlay-card ol { max-width: 430px; margin: 0 auto 18px; padding-left: 1.25rem; color: #f8fafc !important; text-align: left; font-weight: 600; }
.ss-overlay-card li { margin: 8px 0; }
.ss-kicker { margin: 0 !important; color: #ddd6fe !important; font-size: .76rem; font-weight: 900; letter-spacing: .16em; }
.ss-primary-button { min-height: 48px; padding: 12px 30px; border: 0; border-radius: 999px; background: var(--ss-cyan); color: #06202a; font: 900 1rem/1 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; cursor: pointer; box-shadow: 0 0 24px rgba(34,211,238,.32); }
.ss-primary-button:hover, .ss-primary-button:focus-visible { transform: scale(1.03); outline: 3px solid rgba(34,211,238,.22); }

.ss-feedback { position: absolute; z-index: 8; left: 50%; top: 50%; width: min(84%, 450px); transform: translate(-50%, -50%); padding: 14px 18px; border-radius: 15px; text-align: center; font-weight: 900; box-shadow: 0 18px 50px rgba(0,0,0,.42); }
.ss-feedback[data-tone="correct"] { background: rgba(6,78,59,.96); border: 1px solid var(--ss-green); color: #d1fae5; }
.ss-feedback[data-tone="wrong"] { background: rgba(127,29,29,.97); border: 1px solid var(--ss-red); color: #ffe4e6; }

.ss-controls { width: 188px; height: 142px; margin: 15px auto 0; display: grid; grid-template-columns: repeat(3, 1fr); grid-template-rows: repeat(2, 1fr); gap: 8px; }
.ss-controls button { min-width: 54px; min-height: 54px; border: 1px solid rgba(148,163,184,.22); border-radius: 14px; background: #172033; color: var(--ss-text); font-size: 1.18rem; cursor: pointer; touch-action: manipulation; user-select: none; }
.ss-controls button:hover, .ss-controls button:focus-visible, .ss-controls button:active { border-color: var(--ss-cyan); background: #21304a; outline: none; }
.ss-controls [data-dir="up"] { grid-column: 2; grid-row: 1; }
.ss-controls [data-dir="left"] { grid-column: 1; grid-row: 2; }
.ss-controls [data-dir="down"] { grid-column: 2; grid-row: 2; }
.ss-controls [data-dir="right"] { grid-column: 3; grid-row: 2; }
.ss-help { margin: 10px 0 0 !important; color: #cbd5e1 !important; font-size: .75rem; text-align: center; }

.ss-result-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin: 0 auto 16px; }
.ss-result-grid div { padding: 12px; border: 1px solid rgba(148,163,184,.18); border-radius: 12px; background: rgba(255,255,255,.04); }
.ss-result-grid span { display: block; color: var(--ss-muted); font-size: .68rem; text-transform: uppercase; letter-spacing: .08em; }
.ss-result-grid strong { display: block; margin-top: 3px; font: 900 1.35rem/1.1 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; color: var(--ss-cyan); }
.ss-review { max-height: 230px; overflow: auto; margin: 0 0 17px; padding: 12px; border: 1px solid rgba(167,139,250,.22); border-radius: 13px; background: rgba(167,139,250,.06); text-align: left; }
.ss-review h4 { margin: 0 0 9px !important; color: var(--ss-purple); font-size: 1rem; }
.ss-review-item { display: grid; grid-template-columns: 1fr auto; gap: 10px; padding: 9px 0; border-top: 1px solid rgba(148,163,184,.12); }
.ss-review-item:first-child { border-top: 0; }
.ss-review-item span { color: #f1f5f9 !important; font-size: .8rem; }
.ss-review-item strong { color: var(--ss-green); }

.ss-app:fullscreen { max-width: none; margin: 0; background: var(--ss-bg); padding: 0; overflow: auto; }
.ss-app:fullscreen .ss-shell { min-height: 100vh; border-radius: 0; display: flex; flex-direction: column; justify-content: center; }
.ss-app:fullscreen .ss-game-wrap { width: min(78vh, 760px); margin-inline: auto; }

@media (max-width: 620px) {
    .ss-app { margin: 0 auto; }
    .ss-shell { padding: 12px; border-radius: 16px; }
    .ss-subtitle { font-size: .77rem; }
    .ss-header-actions { gap: 5px; }
    .ss-icon-button { width: 38px; height: 38px; }
    .ss-stats { gap: 6px; }
    .ss-stat { padding: 7px 5px; }
    .ss-stat span { font-size: .58rem; }
    .ss-stat strong { font-size: .9rem; }
    .ss-question-panel { min-height: 94px; padding: 11px 12px; }
    .ss-overlay { padding: 15px; }
    .ss-overlay-card ol { font-size: .87rem; }
}


/* v1.1.0 readability and full-screen control */
.ss-header-actions { align-items: center; flex-wrap: wrap; justify-content: flex-end; }
.ss-fullscreen-button {
    min-height: 44px;
    padding: 0 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    border: 2px solid #67e8f9;
    border-radius: 12px;
    background: #0b2536;
    color: #ffffff;
    font: 900 .76rem/1 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    letter-spacing: .04em;
    cursor: pointer;
    box-shadow: 0 0 18px rgba(34,211,238,.2);
    white-space: nowrap;
}
.ss-fullscreen-icon { font-size: 1.2rem; line-height: 1; }
.ss-fullscreen-button:hover,
.ss-fullscreen-button:focus-visible {
    background: #12354a;
    border-color: #a5f3fc;
    outline: 3px solid rgba(103,232,249,.2);
}
.ss-app .ss-title,
.ss-app .ss-subtitle,
.ss-app .ss-question,
.ss-app .ss-overlay-card h3,
.ss-app .ss-overlay-card li,
.ss-app .ss-stat span,
.ss-app .ss-stat strong {
    opacity: 1 !important;
    filter: none !important;
}
.ss-app .ss-overlay-card li strong { color: #ffffff !important; }
.ss-app .ss-question-panel { background: rgba(8,47,73,.82); border-color: rgba(103,232,249,.72); }
.ss-app .ss-stat { background: rgba(30,41,59,.92); border-color: rgba(226,232,240,.22); }

@media (max-width: 520px) {
    .ss-header { flex-wrap: wrap; }
    .ss-header-actions { width: 100%; justify-content: flex-end; }
    .ss-fullscreen-button { min-height: 42px; padding-inline: 12px; font-size: .72rem; }
}