@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;600&family=Syne:wght@400;700&display=swap');

:root {
    --color-background-secondary: #f0f0f0;
    --color-background-primary: #f5f5f7;
    --color-border-primary: #999;
    --color-border-tertiary: #ccc;
    --color-text-primary: #333;
    --color-text-secondary: #666;

    --track-bg: var(--color-background-secondary);
    --card-bg: var(--color-background-primary);
    --border: var(--color-border-tertiary);
    --text: var(--color-text-primary);
    --muted: var(--color-text-secondary);
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-background-secondary: #16181d;
        --color-background-primary: #1e222a;
        --color-border-primary: #6f7785;
        --color-border-tertiary: #3a404b;
        --color-text-primary: #eceff4;
        --color-text-secondary: #a9b0bb;
    }
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background: var(--card-bg);
    color: var(--text);
    height: 100dvh;
    display: grid;
    place-items: center;
}

#app {
    font-family: 'Syne', sans-serif;
    padding: 1.5rem 1rem 2rem;
    width: 540px;
    max-width: 100%;
    margin: 0 auto;
}

@media (max-width: 600px) {
    #app {
        width: 100%;
    }
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.title {
    font-size: 11px;
    font-family: 'JetBrains Mono', monospace;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--muted);
}

.score-row {
    display: flex;
    gap: 12px;
}

.score-pill {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    padding: 3px 10px;
    border-radius: 20px;
    border: 0.5px solid var(--border);
    color: var(--muted);
}

.score-pill span {
    color: var(--text);
    font-weight: 600;
}

.stage {
    background: var(--track-bg);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    margin-bottom: 1rem;
    position: relative;
    overflow: hidden;
}

.track {
    position: relative;
    height: 64px;
    display: flex;
    align-items: center;
}

.track-line {
    position: absolute;
    left: 24px;
    right: 24px;
    height: 0.5px;
    background: var(--border);
}

.dot {
    position: absolute;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--text);
    top: 50%;
    transform: translate(-50%, -50%);
    left: 24px;
}

.start-marker,
.end-marker {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 2px;
    height: 20px;
    background: var(--border);
}

.start-marker {
    left: 24px;
}

.end-marker {
    right: 24px;
}

.replay-btn {
    position: absolute;
    top: 10px;
    right: 12px;
    background: none;
    border: 0.5px solid var(--border);
    border-radius: var(--border-radius-md);
    padding: 4px 10px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    color: var(--muted);
    cursor: pointer;
    transition: color 0.15s;
}

.replay-btn:hover {
    color: var(--text);
}

.choices {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-bottom: 1rem;
}

.choice-btn {
    background: var(--card-bg);
    border: 0.5px solid var(--border);
    border-radius: var(--border-radius-md);
    padding: 10px 14px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: var(--text);
    cursor: pointer;
    text-align: left;
    transition: border-color 0.15s, background 0.15s;
    line-height: 1.4;
}

.choice-btn:hover:not(:disabled) {
    border-color: var(--color-border-primary);
    background: var(--track-bg);
}

.choice-btn.correct {
    border-color: #1D9E75;
    background: #E1F5EE;
    color: #085041;
}

.choice-btn.wrong {
    border-color: #E24B4A;
    background: #FCEBEB;
    color: #501313;
}

.choice-btn.reveal {
    border-color: #1D9E75;
    background: #E1F5EE;
    color: #085041;
}

@media (prefers-color-scheme: dark) {
    .choice-btn.correct {
        background: #04342C;
        color: #9FE1CB;
        border-color: #1D9E75;
    }

    .choice-btn.wrong {
        background: #501313;
        color: #F7C1C1;
        border-color: #E24B4A;
    }

    .choice-btn.reveal {
        background: #04342C;
        color: #9FE1CB;
        border-color: #1D9E75;
    }
}

.feedback {
    min-height: 28px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: var(--muted);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.feedback .msg {}

.feedback .next-btn {
    background: none;
    border: 0.5px solid var(--border);
    border-radius: var(--border-radius-md);
    padding: 5px 14px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: var(--text);
    cursor: pointer;
    display: none;
}

.feedback .next-btn.show {
    display: block;
}

.feedback .next-btn:hover {
    border-color: var(--color-border-primary);
}

.progress {
    display: flex;
    gap: 4px;
    margin-top: 1.25rem;
}

.prog-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--border);
    border: 0.5px solid var(--border);
}

.prog-dot.done-correct {
    background: #1D9E75;
    border-color: #1D9E75;
}

.prog-dot.done-wrong {
    background: #E24B4A;
    border-color: #E24B4A;
}

.prog-dot.current {
    background: var(--text);
    border-color: var(--text);
}

.curve-canvas {
    display: block;
    margin: 0.75rem auto 0;
}

.round-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    color: var(--muted);
    text-align: center;
    margin-bottom: 0.5rem;
}

.end-screen {
    text-align: center;
    padding: 2rem 1rem;
}

.end-screen h2 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.end-screen p {
    font-size: 14px;
    color: var(--muted);
    margin-bottom: 1.5rem;
    font-family: 'JetBrains Mono', monospace;
}

.restart-btn {
    background: var(--text);
    color: var(--card-bg);
    border: none;
    border-radius: var(--border-radius-md);
    padding: 10px 28px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    cursor: pointer;
}