.class-opening {
    --class-brown: #4a261d;
    --class-brown-deep: #351a14;
    --class-orange: #f29a00;
    --class-cream: #fff8e8;
    --class-paper: #fffdf8;
    --class-line: #e8d9c7;
    --class-muted: #76645d;
    position: fixed;
    left: 24px;
    bottom: 24px;
    z-index: 900;
    width: min(340px, calc(100vw - 48px));
    color: var(--class-brown);
    font-family: inherit;
}

.class-opening *,
.class-opening *::before,
.class-opening *::after {
    box-sizing: border-box;
}

.class-opening__summary {
    width: 100%;
    min-height: 152px;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 5px 14px;
    padding: 18px 20px;
    overflow: hidden;
    border: 1px solid rgba(74, 38, 29, .24);
    border-left: 5px solid var(--class-orange);
    border-radius: 16px;
    color: var(--class-brown);
    background: var(--class-paper);
    box-shadow: 0 14px 36px rgba(53, 26, 20, .18);
    font: inherit;
    text-align: left;
    cursor: pointer;
    transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}

.class-opening__summary:hover {
    transform: translateY(-2px);
    border-color: rgba(74, 38, 29, .42);
    box-shadow: 0 18px 42px rgba(53, 26, 20, .23);
}

.class-opening.is-open .class-opening__summary {
    display: none;
}

.class-opening__status {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    color: #855000;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: .08em;
}

.class-opening__status > span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--class-orange);
    box-shadow: 0 0 0 4px rgba(242, 154, 0, .16);
}

.class-opening__summary > strong {
    grid-column: 1 / -1;
    margin-top: 5px;
    color: var(--class-brown-deep);
    font-size: 19px;
    line-height: 1.35;
}

.class-opening__brief {
    grid-column: 1 / -1;
    color: var(--class-muted);
    font-size: 14px;
    line-height: 1.5;
}

.class-opening__more {
    grid-column: 1 / -1;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    margin-top: 7px;
    color: var(--class-brown);
    font-size: 14px;
    font-weight: 700;
}

.class-opening__more svg {
    width: 18px;
    height: 18px;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.8;
    transition: transform .2s ease;
}

.class-opening__summary:hover .class-opening__more svg {
    transform: translateX(3px);
}

.class-opening__panel {
    width: min(400px, calc(100vw - 48px));
    max-height: calc(100vh - 48px);
    max-height: calc(100dvh - 48px);
    overflow-y: auto;
    overscroll-behavior: contain;
    border: 1px solid rgba(74, 38, 29, .24);
    border-radius: 18px;
    color: var(--class-brown);
    background: var(--class-paper);
    box-shadow: 0 20px 54px rgba(53, 26, 20, .25);
    animation: classOpeningIn .22s ease-out both;
}

.class-opening__panel[hidden] {
    display: none;
}

.class-opening__header {
    position: sticky;
    top: 0;
    z-index: 1;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 18px;
    padding: 20px 20px 14px;
    border-bottom: 1px solid var(--class-line);
    background: rgba(255, 253, 248, .97);
}

.class-opening__header p,
.class-opening__header h2 {
    margin: 0;
}

.class-opening__header p {
    margin-bottom: 5px;
    color: #855000;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: .04em;
}

.class-opening__header h2 {
    color: var(--class-brown-deep);
    font-size: 24px;
    line-height: 1.25;
}

.class-opening__close {
    flex: 0 0 44px;
    width: 44px;
    height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin: -7px -8px 0 0;
    border: 0;
    border-radius: 50%;
    color: var(--class-brown);
    background: transparent;
    cursor: pointer;
}

.class-opening__close:hover {
    background: var(--class-cream);
}

.class-opening__close svg {
    width: 22px;
    height: 22px;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.8;
    stroke-linecap: round;
}

.class-opening__intro {
    margin: 0;
    padding: 16px 20px;
    color: var(--class-muted);
    font-size: 14px;
    line-height: 1.65;
}

.class-opening__courses {
    margin: 0 20px;
    border-top: 1px solid var(--class-line);
}

.class-opening__courses details {
    border-bottom: 1px solid var(--class-line);
    background: transparent;
}

.class-opening__courses summary {
    min-height: 52px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 2px;
    list-style: none;
    color: var(--class-brown-deep);
    cursor: pointer;
}

.class-opening__courses summary::-webkit-details-marker {
    display: none;
}

.class-opening__courses summary span {
    min-width: 0;
    font-size: 14px;
    font-weight: 700;
}

.class-opening__courses summary b {
    display: inline-flex;
    min-width: 48px;
    align-items: center;
    justify-content: center;
    margin-right: 6px;
    padding: 4px 7px;
    border: 1px solid var(--class-brown);
    border-radius: 999px;
    font-size: 12px;
    line-height: 1;
}

.class-opening__courses summary strong {
    flex: 0 0 auto;
    color: #855000;
    font-size: 13px;
}

.class-opening__courses summary::after {
    content: '+';
    flex: 0 0 20px;
    color: var(--class-brown);
    font-size: 21px;
    font-weight: 400;
    line-height: 1;
    text-align: center;
}

.class-opening__courses details[open] summary::after {
    content: '−';
}

.class-opening__courses details[open] summary b {
    border-color: var(--class-orange);
    background: var(--class-cream);
}

.class-opening__courses details p {
    margin: -2px 0 0;
    padding: 0 2px 14px 56px;
    color: var(--class-muted);
    font-size: 13px;
    line-height: 1.7;
}

.class-opening__actions {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 10px;
    padding: 18px 20px 20px;
}

.class-opening__primary,
.class-opening__phone {
    min-height: 46px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 15px;
    border: 1px solid var(--class-brown);
    border-radius: 10px;
    font-size: 14px;
    font-weight: 700;
    line-height: 1.3;
    text-align: center;
}

.class-opening__primary {
    color: #fff;
    background: var(--class-brown);
}

.class-opening__phone {
    color: var(--class-brown);
    background: transparent;
}

.class-opening__primary:hover,
.class-opening__primary:focus-visible {
    color: #fff;
    background: var(--class-brown-deep);
}

.class-opening__phone:hover,
.class-opening__phone:focus-visible {
    color: var(--class-brown);
    background: var(--class-cream);
}

.class-opening__summary:focus-visible,
.class-opening__close:focus-visible,
.class-opening__courses summary:focus-visible,
.class-opening__actions a:focus-visible {
    outline: 3px solid #1e6bb8;
    outline-offset: 3px;
}

@keyframes classOpeningIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 767px) {
    .class-opening {
        left: 12px;
        right: 12px;
        bottom: max(12px, env(safe-area-inset-bottom));
        width: auto;
    }

    .class-opening__summary {
        min-height: 0;
        grid-template-columns: 1fr auto;
        padding: 14px 16px;
        border-radius: 14px;
    }

    .class-opening__summary > strong {
        font-size: 17px;
    }

    .class-opening__panel {
        width: 100%;
        max-height: calc(100vh - 24px);
        max-height: calc(100dvh - 24px - env(safe-area-inset-bottom));
        border-radius: 16px;
    }
}

@media (max-width: 380px) {
    .class-opening__brief {
        font-size: 13px;
    }

    .class-opening__actions {
        grid-template-columns: 1fr;
    }

    .class-opening__courses details p {
        padding-left: 2px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .class-opening__summary,
    .class-opening__more svg,
    .class-opening__panel {
        animation: none;
        transition: none;
    }
}