/* ===== ОБУЧЕНИЕ БИЛЬЯРДУ: ЧТО ВХОДИТ В УРОК ===== */

.ob-lesson {
    position: relative;
    overflow: hidden;
    padding: 110px 0 118px;
    background:
        radial-gradient(circle at 82% 18%, rgba(216, 177, 115, .12), transparent 28%),
        radial-gradient(circle at 12% 78%, rgba(170, 118, 57, .09), transparent 30%),
        linear-gradient(180deg, #070807 0%, #0b0d0c 54%, #080b0a 100%);
    color: #f7f3ec;
}

.ob-lesson:before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        linear-gradient(90deg, rgba(255,255,255,.03) 1px, transparent 1px),
        linear-gradient(180deg, rgba(255,255,255,.022) 1px, transparent 1px);
    background-size: 220px 220px;
    opacity: .28;
    pointer-events: none;
}

.ob-lesson__inner {
    position: relative;
    z-index: 2;
    width: min(1180px, calc(100% - 40px));
    margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(0, .86fr) minmax(0, 1.14fr);
    gap: 56px;
    align-items: start;
}

.ob-lesson__head {
    position: sticky;
    top: 28px;
}

.ob-lesson__kicker {
    display: inline-flex;
    align-items: center;
    margin-bottom: 18px;
    color: #d8b173;
    font-size: 12px;
    font-weight: 900;
    line-height: 1.2;
    letter-spacing: .28em;
    text-transform: uppercase;
}

.ob-lesson__title {
    max-width: 560px;
    margin: 0;
    color: #f7f3ec;
    font-family: "Cormorant Garamond", Georgia, serif;
    font-size: clamp(44px, 5.2vw, 74px);
    font-weight: 500;
    line-height: .96;
    letter-spacing: -.035em;
    text-transform: none;
}

.ob-lesson__text {
    max-width: 560px;
    margin-top: 28px;
    color: rgba(247, 243, 236, .76);
    font-size: 18px;
    line-height: 1.75;
}

.ob-lesson__panel {
    padding: 34px;
    border: 1px solid rgba(216, 177, 115, .22);
    background:
        linear-gradient(180deg, rgba(255,255,255,.035), rgba(255,255,255,.012)),
        rgba(9, 11, 10, .72);
    box-shadow: 0 24px 70px rgba(0,0,0,.28);
}

.ob-lesson__panel-title {
    margin-bottom: 26px;
    color: #d8b173;
    font-size: 12px;
    font-weight: 900;
    line-height: 1.2;
    letter-spacing: .22em;
    text-transform: uppercase;
}

.ob-lesson__list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
    margin: 0;
    padding: 0;
    list-style: none;
    counter-reset: lesson;
}

.ob-lesson-item {
    position: relative;
    min-height: 96px;
    padding: 22px 20px 20px 64px;
    border: 1px solid rgba(216, 177, 115, .18);
    background: rgba(255,255,255,.025);
    color: rgba(247, 243, 236, .86);
    font-size: 15px;
    line-height: 1.55;
    transition: background .22s ease, border-color .22s ease, transform .22s ease;
}

.ob-lesson-item:hover {
    transform: translateY(-3px);
    border-color: rgba(216, 177, 115, .42);
    background: rgba(216, 177, 115, .07);
}

.ob-lesson-item:before {
    counter-increment: lesson;
    content: counter(lesson, decimal-leading-zero);
    position: absolute;
    left: 18px;
    top: 20px;
    color: #d8b173;
    font-size: 14px;
    font-weight: 900;
    line-height: 1;
    letter-spacing: .06em;
}

.ob-lesson-item:after {
    content: "";
    position: absolute;
    left: 18px;
    top: 43px;
    width: 28px;
    height: 1px;
    background: rgba(216, 177, 115, .72);
}

.ob-lesson-item__text {
    display: block;
}

/* ===== АДАПТИВ ===== */

@media (max-width: 1199px) {
    .ob-lesson__inner {
        gap: 38px;
    }

    .ob-lesson__list {
        gap: 14px;
    }
}

@media (max-width: 991px) {
    .ob-lesson {
        padding: 86px 0 94px;
    }

    .ob-lesson__inner {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .ob-lesson__head {
        position: relative;
        top: auto;
    }

    .ob-lesson__title {
        max-width: 760px;
        font-size: 52px;
    }

    .ob-lesson__text {
        max-width: 780px;
    }
}

@media (max-width: 767px) {
    .ob-lesson {
        padding: 64px 0 72px;
    }

    .ob-lesson__inner {
        width: min(100% - 28px, 1180px);
        gap: 32px;
    }

    .ob-lesson__title {
        font-size: 39px;
        line-height: 1;
    }

    .ob-lesson__text {
        margin-top: 20px;
        font-size: 16px;
        line-height: 1.65;
    }

    .ob-lesson__panel {
        padding: 22px;
    }

    .ob-lesson__list {
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .ob-lesson-item {
        min-height: auto;
        padding: 20px 18px 18px 58px;
        font-size: 15px;
    }
}

@media (max-width: 420px) {
    .ob-lesson__inner {
        width: min(100% - 22px, 1180px);
    }

    .ob-lesson__title {
        font-size: 34px;
    }

    .ob-lesson__text {
        font-size: 15px;
    }

    .ob-lesson__panel {
        padding: 18px;
    }

    .ob-lesson-item {
        padding-left: 54px;
    }
}