/* Сторінка «Рівні занурення» — доповнення до site.css */

.levels-hero {
    text-align: center;
    padding: 3rem 1.5rem 1rem;
    animation: fadeUp 0.9s ease 0.05s both;
}

.levels-hero__title {
    font-size: clamp(1.6rem, 5vw, 2.8rem);
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    background: linear-gradient(135deg, #4dd0e1 0%, #0288d1 50%, #01579b 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.levels-hero__sub {
    margin-top: 0.6rem;
    font-size: clamp(0.82rem, 1.8vw, 1.05rem);
    font-weight: 400;
    color: var(--card-desc-color, var(--text-muted));
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

.timeline {
    max-width: 900px;
    margin: 2.5rem auto 4rem;
    padding: 0 1.5rem;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, #4dd0e1 0%, #0288d1 35%, #01579b 70%, #b8860b 100%);
    transform: translateX(-50%);
}

.level {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-bottom: 4rem;
    opacity: 0;
    transform: translateY(30px);
    animation: levelIn 0.6s ease forwards;
}

.level:nth-child(1) { animation-delay: 0.1s; }
.level:nth-child(2) { animation-delay: 0.25s; }
.level:nth-child(3) { animation-delay: 0.4s; }
.level:nth-child(4) { animation-delay: 0.55s; }
.level:nth-child(5) { animation-delay: 0.7s; }

@keyframes levelIn {
    to { opacity: 1; transform: translateY(0); }
}

.level::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 2.5rem;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.level--shelf::before { background: #4dd0e1; box-shadow: 0 0 16px #4dd0e1; }
.level--current::before { background: #0288d1; box-shadow: 0 0 16px #0288d1; }
.level--deep::before { background: #01579b; box-shadow: 0 0 16px #01579b; }
.level--abyss::before { background: #b8860b; box-shadow: 0 0 16px #daa520; }

/* Дельфінчик, що плавно пропливає по точках таймлайну під час скролу */
.timeline-dolphin {
    position: absolute;
    left: 50%;
    top: 0;
    transform: translate(-50%, -50%);
    font-size: 1.9rem;
    line-height: 1;
    z-index: 3;
    pointer-events: none;
    transition: top 0.75s cubic-bezier(0.25, 0.8, 0.35, 1),
                left 0.75s cubic-bezier(0.25, 0.8, 0.35, 1);
    filter: drop-shadow(0 4px 12px rgba(2, 136, 209, 0.55));
    animation: dolphinSwim 3.2s ease-in-out infinite;
    will-change: top, left;
}

/* М'яке погойдування — імітація плавання */
@keyframes dolphinSwim {
    0%   { transform: translate(-50%, -50%) rotate(-7deg); }
    50%  { transform: translate(-46%, -52%) rotate(7deg); }
    100% { transform: translate(-50%, -50%) rotate(-7deg); }
}

@media (prefers-reduced-motion: reduce) {
    .timeline-dolphin {
        transition: none;
        animation: none;
    }
}

.level:nth-child(even) .level__content { order: 2; text-align: left; }
.level:nth-child(even) .level__visual { order: 1; }
.level:nth-child(odd) .level__content { text-align: right; }

.level__visual {
    display: flex;
    justify-content: center;
    align-items: flex-start;
}

.level__img {
    width: 100%;
    max-width: 340px;
    height: auto;
    border-radius: 16px;
    transition: transform 0.35s ease, box-shadow 0.35s ease;
}

.level:hover .level__img {
    transform: scale(1.03);
}

.level--shelf:hover .level__img { box-shadow: 0 8px 40px rgba(77, 208, 225, 0.2); }
.level--current:hover .level__img { box-shadow: 0 8px 40px rgba(2, 136, 209, 0.2); }
.level--deep:hover .level__img { box-shadow: 0 8px 40px rgba(1, 87, 155, 0.25); }
.level--abyss:hover .level__img { box-shadow: 0 8px 40px rgba(218, 165, 32, 0.2); }

.level__content { padding-top: 0.5rem; }

.level__age {
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    margin-bottom: 0.4rem;
}

.level--shelf .level__age { color: #4dd0e1; }
.level--current .level__age { color: #0288d1; }
.level--deep .level__age { color: #5c9bd4; }
.level--abyss .level__age { color: #daa520; }

.level__name {
    font-size: clamp(1.2rem, 3vw, 1.8rem);
    font-weight: 800;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.level__desc {
    font-size: 0.85rem;
    font-weight: 400;
    color: var(--card-desc-color, var(--text-muted));
    line-height: 1.7;
    margin-bottom: 1rem;
    text-align: justify;
    hyphens: auto;
}

.level__tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.level:nth-child(odd) .level__tags { justify-content: flex-end; }

.level-tag {
    font-size: 0.6rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    padding: 0.25rem 0.6rem;
    border-radius: 6px;
    white-space: nowrap;
}

.level--shelf .level-tag { background: rgba(77, 208, 225, 0.12); color: #4dd0e1; }
.level--current .level-tag { background: rgba(2, 136, 209, 0.12); color: #42a5f5; }
.level--deep .level-tag { background: rgba(1, 87, 155, 0.15); color: #5c9bd4; }
.level--abyss .level-tag { background: rgba(218, 165, 32, 0.12); color: #daa520; }

.levels-cta {
    text-align: center;
    padding: 0 1.5rem 4rem;
}

.levels-cta .btn {
    padding: 0.85rem 2rem;
    font-size: 0.72rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: #fff;
    background: var(--cta-gradient);
    border: none;
}

.levels-cta .btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--cta-shadow);
}

.levels-empty {
    text-align: center;
    color: var(--text-muted);
    padding: 2rem 1.5rem 4rem;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .timeline::before { left: 1.5rem; }
    .level {
        grid-template-columns: 1fr;
        gap: 1rem;
        padding-left: 2.5rem;
        margin-bottom: 3rem;
    }
    .level::before { left: 1.5rem; top: 0; }
    .level:nth-child(odd) .level__content,
    .level:nth-child(even) .level__content { text-align: left; order: 2; }
    .level:nth-child(odd) .level__tags,
    .level:nth-child(even) .level__tags { justify-content: flex-start; }
    .level__visual { order: 1; }
    .level__img { max-width: 100%; width: 100%; }
    .level__desc { text-align: left; }
}

@media (max-width: 640px) {
    .levels-hero {
        padding: 2rem max(1rem, env(safe-area-inset-right)) 0.75rem max(1rem, env(safe-area-inset-left));
    }

    .levels-hero__title {
        font-size: clamp(1.35rem, 7vw, 2rem);
        letter-spacing: 0.04em;
    }

    .levels-hero__sub {
        max-width: none;
        padding: 0 0.25rem;
    }

    .timeline {
        margin: 1.75rem auto 2.5rem;
        padding: 0 max(1rem, env(safe-area-inset-right)) 0 max(1rem, env(safe-area-inset-left));
    }

    .level {
        padding-left: 2rem;
        margin-bottom: 2.25rem;
    }

    .level__name {
        font-size: clamp(1rem, 5vw, 1.35rem);
    }

    .levels-cta {
        padding: 0 max(1rem, env(safe-area-inset-right)) 2.5rem max(1rem, env(safe-area-inset-left));
    }

    .levels-cta .btn {
        width: 100%;
        max-width: 20rem;
        min-height: 44px;
    }
}