body.page-study {
    --study-bg: #030208;
    --study-panel: rgba(13, 10, 28, 0.72);
    --study-panel-strong: rgba(23, 14, 44, 0.84);
    --study-border: rgba(168, 85, 247, 0.26);
    --study-text: #f8f3ff;
    --study-muted: #b6a8cc;
    --study-dim: #766a88;
    --study-violet: #a855f7;
    --study-blue: #0ea5e9;
    --study-green: #22c55e;
    --study-amber: #f59e0b;
    --study-slate: #94a3b8;
    background:
        radial-gradient(circle at 22% 10%, rgba(168, 85, 247, 0.24), transparent 30%),
        radial-gradient(circle at 74% 36%, rgba(14, 165, 233, 0.16), transparent 26%),
        radial-gradient(circle at 48% 82%, rgba(34, 197, 94, 0.11), transparent 30%),
        linear-gradient(180deg, #05020d 0%, #020106 100%);
    color: var(--study-text);
}

body.page-study .site-main {
    min-height: calc(100svh - 48px);
}

.study-hub {
    position: relative;
    display: block;
    width: 100%;
    min-height: calc(100svh - 48px);
    margin: 0 auto;
    overflow: hidden;
    border: 1px solid var(--study-border);
    border-radius: 10px;
    background:
        linear-gradient(120deg, rgba(168, 85, 247, 0.08), transparent 34%),
        rgba(3, 2, 12, 0.64);
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.42), 0 0 42px rgba(168, 85, 247, 0.12);
}

.study-hub::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
    background-size: 44px 44px;
    mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.6), transparent 76%);
}

.study-sidebar {
    display: none;
}

.study-sidebar__hamburger {
    width: 44px;
    height: 44px;
    margin: 0 0 16px;
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    border: 0;
    border-radius: 8px;
    color: var(--study-text);
    background: rgba(255, 255, 255, 0.04);
}

.study-sidebar__hamburger span {
    width: 22px;
    height: 2px;
    border-radius: 999px;
    background: currentColor;
}

.study-sidebar__nav a {
    min-height: 42px;
    display: flex;
    align-items: center;
    border-radius: 7px;
    padding: 9px 12px;
    color: var(--study-muted);
    text-decoration: none;
    font-size: 0.93rem;
}

.study-sidebar__nav a:hover,
.study-sidebar__nav a.is-active {
    color: var(--study-text);
    background: linear-gradient(90deg, rgba(168, 85, 247, 0.28), rgba(168, 85, 247, 0.08));
    box-shadow: inset 2px 0 0 var(--study-violet);
}

.study-sidebar__root {
    font-weight: 700;
}

.study-sidebar__nav ul {
    list-style: none;
    display: grid;
    gap: 4px;
    margin: 8px 0 0 14px;
    padding: 0 0 0 12px;
    border-left: 1px solid rgba(168, 85, 247, 0.28);
}

.study-sidebar__nav li {
    margin: 0;
}

.study-hub__main {
    position: relative;
    z-index: 1;
    padding: clamp(22px, 3vw, 42px);
}

.study-hero {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 18px;
    margin-bottom: 22px;
}

.study-kicker {
    margin: 0 0 7px;
    color: #c084fc;
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.study-hero h1 {
    margin: 0;
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    line-height: 0.92;
    letter-spacing: 0;
}

.study-hero p:not(.study-kicker) {
    margin: 10px 0 0;
    color: var(--study-muted);
    font-size: clamp(1rem, 1.5vw, 1.18rem);
}

.study-stats {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
    margin-bottom: 26px;
}

.study-stat-card,
.study-course-card {
    border: 1px solid rgba(168, 85, 247, 0.22);
    background:
        linear-gradient(135deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.02)),
        var(--study-panel);
    backdrop-filter: blur(18px);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08), 0 18px 48px rgba(0, 0, 0, 0.28);
}

.study-stat-card {
    min-height: 102px;
    display: flex;
    align-items: center;
    gap: 13px;
    border-radius: 8px;
    padding: 16px;
}

.study-stat-card__icon {
    width: 44px;
    height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    background: rgba(168, 85, 247, 0.18);
    box-shadow: 0 0 22px rgba(168, 85, 247, 0.26);
    font-size: 1.4rem;
}

.study-stat-card p {
    margin: 0 0 5px;
    color: var(--study-muted);
    font-size: 0.83rem;
}

.study-stat-card strong {
    display: block;
    color: var(--study-text);
    font-size: clamp(1.35rem, 2vw, 2rem);
    line-height: 1;
}

.study-section-head {
    margin-bottom: 14px;
}

.study-section-head h2 {
    margin: 0;
    font-size: 1.25rem;
}

.study-card-grid {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 14px;
}

.study-course-card {
    --course: var(--study-violet);
    position: relative;
    min-height: 238px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 18px;
    overflow: hidden;
    border-radius: 8px;
    color: var(--study-text);
    text-decoration: none;
}

.study-course-card::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background:
        radial-gradient(circle at 16% 18%, color-mix(in srgb, var(--course) 38%, transparent), transparent 30%),
        radial-gradient(circle at 84% 78%, color-mix(in srgb, var(--course) 18%, transparent), transparent 34%);
    opacity: 0.9;
}

.study-course-card > * {
    position: relative;
    z-index: 1;
}

.study-course-card--violet {
    --course: var(--study-violet);
}

.study-course-card--blue {
    --course: var(--study-blue);
    border-color: rgba(14, 165, 233, 0.32);
}

.study-course-card--green {
    --course: var(--study-green);
    border-color: rgba(34, 197, 94, 0.32);
}

.study-course-card--amber {
    --course: var(--study-amber);
    border-color: rgba(245, 158, 11, 0.34);
}

.study-course-card--slate {
    --course: var(--study-slate);
    border-color: rgba(148, 163, 184, 0.28);
}

.study-course-card__top {
    display: grid;
    grid-template-columns: 54px minmax(0, 1fr);
    gap: 13px;
    align-items: start;
}

.study-course-card__icon {
    width: 54px;
    height: 54px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    background: color-mix(in srgb, var(--course) 26%, transparent);
    box-shadow: 0 0 28px color-mix(in srgb, var(--course) 40%, transparent);
    font-size: 1.6rem;
}

.study-course-card h3 {
    margin: 1px 0 8px;
    color: #fff;
    font-size: 1.35rem;
    line-height: 1.1;
    word-break: normal;
    overflow-wrap: normal;
    hyphens: none;
}

.study-course-card p {
    margin: 0;
    color: var(--study-muted);
    font-size: 0.9rem;
    line-height: 1.55;
}

.study-course-card__metrics {
    margin-top: auto;
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 10px;
}

.study-course-card__metrics strong {
    color: #fff;
    font-size: 2rem;
    line-height: 1;
}

.study-course-card__metrics strong span {
    margin-left: 3px;
    color: var(--study-muted);
    font-size: 0.92rem;
}

.study-course-card__metrics > span {
    color: var(--course);
    font-size: 0.92rem;
    font-weight: 800;
    white-space: nowrap;
}

.study-progress {
    height: 5px;
    overflow: hidden;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.08);
}

.study-progress span {
    display: block;
    width: var(--progress);
    height: 100%;
    border-radius: inherit;
    background: var(--course);
    box-shadow: 0 0 16px var(--course);
}

.study-course-card__action {
    min-height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 7px;
    background: color-mix(in srgb, var(--course) 28%, rgba(255, 255, 255, 0.03));
    color: #fff;
    font-weight: 800;
    word-break: normal;
}

.study-course-card:hover {
    transform: translateY(-2px);
    border-color: color-mix(in srgb, var(--course) 58%, transparent);
    box-shadow: 0 20px 58px rgba(0, 0, 0, 0.34), 0 0 28px color-mix(in srgb, var(--course) 18%, transparent);
}

.study-course-card:focus-visible {
    outline: 3px solid var(--course);
    outline-offset: 4px;
}

@media (max-width: 1180px) {
    .study-card-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .study-stats {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (min-width: 761px) {
    .study-course-card__top {
        display: flex;
        flex-direction: column;
    }
}

@media (max-width: 760px) {
    .study-hub {
        display: block;
        width: 100%;
        min-height: 100svh;
        margin: 0;
        border: 0;
        border-radius: 0;
    }

    .study-sidebar {
        display: none;
    }

    .study-hub__main {
        padding: 28px 14px 34px;
    }

    .study-hero {
        justify-content: center;
        text-align: center;
        margin-bottom: 18px;
    }

    .study-hero h1 {
        font-size: 2.35rem;
    }

    .study-stats {
        display: flex;
        gap: 10px;
        margin: 0 -14px 22px;
        padding: 0 14px 4px;
        overflow-x: auto;
        overscroll-behavior-x: contain;
        scroll-snap-type: x mandatory;
    }

    .study-stat-card {
        flex: 0 0 142px;
        min-height: 78px;
        padding: 12px;
        scroll-snap-align: start;
    }

    .study-stat-card__icon {
        width: 34px;
        height: 34px;
        font-size: 1rem;
    }

    .study-stat-card p {
        font-size: 0.72rem;
    }

    .study-stat-card strong {
        font-size: 1.1rem;
    }

    .study-card-grid {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .study-course-card {
        min-height: 132px;
        gap: 10px;
        padding: 14px;
    }

    .study-course-card__top {
        grid-template-columns: 46px minmax(0, 1fr);
        gap: 12px;
    }

    .study-course-card__icon {
        width: 46px;
        height: 46px;
        font-size: 1.35rem;
    }

    .study-course-card h3 {
        font-size: 1.08rem;
    }

    .study-course-card p {
        font-size: 0.83rem;
    }

    .study-course-card__metrics strong {
        font-size: 1.45rem;
    }

    .study-course-card__action {
        min-height: 44px;
    }
}