.exercise-track-page {
    max-width: 1040px;
    margin: 36px auto 64px;
    padding: 0 24px;
}

.exercise-track-hero {
    margin-bottom: 22px;
}

.exercise-track-kicker {
    margin: 0 0 12px;
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: #5b6b7b;
}

.exercise-track-hero h1 {
    margin: 0;
    font-size: clamp(2rem, 3.5vw, 2.8rem);
    line-height: 1.08;
    letter-spacing: -0.04em;
    color: #13283b;
}

.exercise-track-lead {
    max-width: 64ch;
    margin: 14px 0 0;
    font-size: 1rem;
    line-height: 1.72;
    color: #5d6d7c;
}

.exercise-track-stage {
    background: #ffffff;
    border: 1px solid #d8e0e7;
    border-radius: 18px;
    padding: 32px;
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.04);
}

.exercise-track-topline {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
}

.exercise-track-status {
    display: inline-flex;
    align-items: center;
    padding: 7px 12px;
    border-radius: 999px;
    border: 1px solid #d7e0e7;
    background: #f5f8fb;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: #5a6a79;
}

.exercise-track-back {
    color: #1f3b57;
    font-weight: 600;
    text-decoration: none;
}

.exercise-track-steps {
    display: grid;
    gap: 16px;
}

.exercise-track-highlight {
    margin-bottom: 20px;
    border-radius: 18px;
    border: 1px solid #cfdbe8;
    background:
        radial-gradient(circle at top right, rgba(159, 189, 220, 0.24), transparent 28%),
        linear-gradient(180deg, #f8fbff 0%, #f2f7fc 100%);
    box-shadow: 0 14px 30px rgba(26, 54, 93, 0.07);
    overflow: hidden;
}

.exercise-track-highlight-toggle {
    display: block;
    position: relative;
}

.exercise-track-highlight-toggle summary {
    list-style: none;
    cursor: pointer;
    padding: 22px 22px 20px;
}

.exercise-track-highlight-toggle summary::-webkit-details-marker {
    display: none;
}

.exercise-track-highlight-toggle summary::after {
    content: "▾";
    position: absolute;
    top: 24px;
    right: 22px;
    color: #4f6a84;
    font-size: 1rem;
    transition: transform 0.18s ease;
}

.exercise-track-highlight-toggle[open] summary::after {
    transform: rotate(180deg);
}

.exercise-track-highlight-head {
    margin-bottom: 0;
    padding-right: 26px;
}

.exercise-track-highlight-kicker {
    margin: 0 0 8px;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: #4f6a84;
}

.exercise-track-highlight h2 {
    margin: 0;
    font-size: 1.4rem;
    line-height: 1.18;
    letter-spacing: -0.03em;
    color: #17304a;
}

.exercise-track-highlight-preview {
    margin: 12px 0 0;
    max-width: 62ch;
    font-size: 14px;
    line-height: 1.72;
    color: #587087;
}

.exercise-track-highlight-body p {
    margin: 14px 0 0;
    font-size: 14px;
    line-height: 1.8;
    color: #4f6171;
}

.exercise-track-highlight-body {
    padding: 0 22px 20px;
    border-top: 1px solid #d9e4ee;
}

.exercise-track-highlight-body strong {
    color: #17304a;
}

.exercise-track-highlight-source a {
    color: #1f4f8a;
    font-weight: 700;
    text-decoration: none;
}

.exercise-step-card {
    padding: 24px;
    border: 1px solid #d8e0e7;
    border-radius: 16px;
    background: #ffffff;
}

.exercise-step-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
}

.exercise-step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    height: 44px;
    padding: 0 12px;
    border-radius: 999px;
    border: 1px solid #cfd8df;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: #536271;
}

.exercise-step-state {
    display: inline-flex;
    align-items: center;
    padding: 6px 10px;
    border-radius: 999px;
    border: 1px solid #d7e0e7;
    background: #f6f9fb;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: #5a6a79;
}

.exercise-step-title {
    margin: 16px 0 0;
    font-size: 1.35rem;
    line-height: 1.2;
    letter-spacing: -0.03em;
    color: #13283b;
}

.exercise-step-copy {
    margin: 14px 0 0;
    font-size: 15px;
    line-height: 1.75;
    color: #556575;
}

.exercise-step-focus {
    margin: 14px 0 0;
    font-size: 14px;
    line-height: 1.7;
    color: #4f6070;
}

.exercise-step-focus strong {
    color: #17304a;
}

.exercise-step-actions {
    margin-top: 18px;
}

.exercise-step-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 136px;
    padding: 11px 16px;
    border-radius: 10px;
    background: #1f3b57;
    color: #ffffff;
    text-decoration: none;
    font-weight: 700;
}

.exercise-step-btn.is-muted {
    background: #d7dfe6;
    color: #5c6976;
}

@media (max-width: 720px) {
    .exercise-track-page {
        margin-top: 22px;
        padding: 0 16px;
    }

    .exercise-track-stage {
        padding: 22px 18px;
    }

    .exercise-step-card {
        padding: 20px 18px;
    }

    .exercise-track-topline,
    .exercise-step-row {
        flex-direction: column;
        align-items: flex-start;
    }
}