.progress-snake {
    margin: 0 0 36px;
    padding: 28px 30px 18px;
    border: 1px solid #e2e8f0;
    border-radius: 18px;
    background: #fff;
    color: #334155;
    box-shadow: 0 3px 18px rgba(15, 23, 42, .07);
}

.progress-snake__header {
    position: relative;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 24px;
}

.progress-snake__title {
    margin-bottom: 4px;
}

.progress-snake__subtitle {
    margin: 0;
    color: #64748b;
    font-size: 13px;
}

.progress-snake__canvas {
    position: relative;
    width: 100%;
    max-width: 1000px;
    min-height: 160px;
    margin: 0 auto;
}

.progress-snake__svg {
    position: absolute;
    z-index: 0;
    inset: 0;
    width: 100%;
    height: 100%;
    overflow: visible;
    pointer-events: none;
}

.progress-snake__grid {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    gap: 28px;
    width: 100%;
    padding: 30px 0 54px;
}

.progress-snake__row {
    position: relative;
    display: flex;
    justify-content: space-between;
    width: 100%;
}

.progress-snake__row.is-reverse {
    flex-direction: row-reverse;
}

.progress-snake__node {
    --snake-color: #c8d6e2;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 25%;
    max-width: 210px;
    padding: 0 8px;
    border: 0;
    background: transparent;
    color: inherit;
    font: inherit;
    text-align: center;
    cursor: default;
    animation: progressSnakeIn .4s ease-out both;
    transition: transform .22s ease;
}

.progress-snake__node[data-kind="chapter"]    { --snake-color: #1a73b5; }
.progress-snake__node[data-kind="item"]       { --snake-color: #fec72d; }
.progress-snake__node[data-kind="video"]      { --snake-color: #1d8dbe; }
.progress-snake__node[data-kind="audio"]      { --snake-color: #f08030; }
.progress-snake__node[data-kind="quiz"]       { --snake-color: #20b4a4; }
.progress-snake__node[data-kind="game"]       { --snake-color: #8b5cf6; }
.progress-snake__node[data-kind="text"]       { --snake-color: #16a34a; }
.progress-snake__node[data-kind="pdf"]        { --snake-color: #dc2626; }
.progress-snake__node[data-kind="info"]       { --snake-color: #5a9bcd; }
.progress-snake__node[data-kind="bewertung"]  { --snake-color: #f59e0b; }
.progress-snake__node.is-completed            { --snake-color: #10b981; }

.progress-snake__node:hover {
    transform: scale(1.04);
}

.progress-snake__marker {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    margin-bottom: 7px;
}

.progress-snake__ring {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 45px;
    height: 45px;
    border: 4px solid var(--snake-color);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: transform .22s ease, opacity .22s ease;
}

.progress-snake__node.is-chapter .progress-snake__ring {
    width: 60px;
    height: 60px;
    border-width: 5px;
}

.progress-snake__dot {
    position: relative;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border: 1px solid #cbd5e1;
    border-radius: 50%;
    background: #fff;
    color: transparent;
    box-shadow: 0 1px 4px rgba(15, 23, 42, .16);
}

.progress-snake__node.is-chapter .progress-snake__dot {
    width: 30px;
    height: 30px;
}

.progress-snake__node.is-completed .progress-snake__dot {
    border-color: #10b981;
    background: #10b981;
    color: #fff;
}

.progress-snake__node.is-chapter .progress-snake__dot i {
    font-size: 20px;
    line-height: 1;
}

.progress-snake__dot i {
    font-size: 9px;
    line-height: 1;
}

.progress-snake__time {
    margin-bottom: 3px;
    font-size: 13px;
    font-weight: 800;
    letter-spacing: .02em;
}

.progress-snake__node.is-chapter .progress-snake__time {
    font-size: 15px;
}

.progress-snake__label {
    display: -webkit-box;
    max-width: 155px;
    overflow: hidden;
    color: #64748b;
    font-size: 12px;
    font-weight: 600;
    line-height: 1.35;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
}

.progress-snake__node.is-chapter .progress-snake__label {
    color: #1e293b;
    font-size: 13px;
    font-weight: 700;
}

.progress-snake__label i {
    margin-right: 4px;
}

.progress-snake__path {
    fill: none;
    stroke: #475569;
    stroke-width: 2;
    stroke-dasharray: 6 6;
    stroke-linecap: round;
    animation: progressSnakeDash 30s linear infinite;
}

.progress-snake__path.is-completed {
    stroke: #10b981;
    stroke-dasharray: none;
    filter: drop-shadow(0 0 2px rgba(16, 185, 129, .4));
    animation: none;
}

.progress-snake__start,
.progress-snake__end {
    position: absolute;
    z-index: 3;
    display: none;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: #fff;
    box-shadow: 0 2px 8px rgba(15, 23, 42, .16);
    transform: translate(-50%, -50%);
}

.progress-snake__start {
    width: 28px;
    height: 28px;
    color: #475569;
}

.progress-snake__end {
    width: 34px;
    height: 34px;
    padding: 0;
    border: 0;
    color: #475569;
    cursor: default;
    transition: background .2s ease, color .2s ease, transform .2s ease;
}

.progress-snake__start.is-visible,
.progress-snake__end.is-visible {
    display: flex;
}

.progress-snake__start.is-completed,
.progress-snake__end.is-completed {
    color: #10b981;
}

.progress-snake__end.is-load-more {
    width: 40px;
    height: 40px;
    background: #2563eb;
    color: #fff;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(37, 99, 235, .3);
}

.progress-snake__end.is-load-more:hover,
.progress-snake__end.is-load-more:focus-visible {
    background: #1d4ed8;
    outline: none;
    transform: translate(-50%, -50%) scale(1.1);
}

.progress-snake__end span {
    position: absolute;
    bottom: -42px;
    left: 50%;
    padding: 6px 12px;
    border: 1px solid #dbeafe;
    border-radius: 999px;
    background: #fff;
    color: #2563eb;
    box-shadow: 0 3px 10px rgba(15, 23, 42, .12);
    font-size: 11px;
    font-weight: 700;
    white-space: nowrap;
    pointer-events: none;
    transform: translateX(-50%);
    animation: progressSnakeLoadMore 1.6s ease-in-out infinite;
}

.progress-snake__end:disabled {
    opacity: 1;
}

@keyframes progressSnakeDash {
    to { stroke-dashoffset: -1000; }
}

@keyframes progressSnakeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes progressSnakeLoadMore {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(-4px); }
}

@media (max-width: 899px) {
    .progress-snake__node { width: 33.333%; }
}

@media (max-width: 639px) {
    .progress-snake {
        padding: 22px 16px 12px;
    }

    .progress-snake__header {
        align-items: flex-start;
        flex-direction: column;
    }

    .progress-snake__grid {
        gap: 24px;
    }

    .progress-snake__node {
        width: 50%;
        max-width: none;
    }

    .progress-snake__row.is-reverse {
        flex-direction: row-reverse;
    }
}