.nav-links a.active {
    color: #5ee7ff;
}

.experiments-hero {
    position: relative;
    overflow: hidden;
    padding: 92px 20px 84px;
    background:
        radial-gradient(circle at 20% 18%, rgba(94, 231, 255, 0.16), transparent 34%),
        radial-gradient(circle at 82% 18%, rgba(143, 92, 255, 0.18), transparent 34%),
        radial-gradient(circle at 64% 84%, rgba(255, 204, 112, 0.10), transparent 34%);
}

.experiments-hero-inner {
    max-width: 1180px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: 60px;
    align-items: center;
}

.experiments-hero-left h1 {
    margin: 0;
    font-size: clamp(42px, 5.8vw, 70px);
    line-height: 1.08;
    letter-spacing: -2px;
}

.experiments-hero-left p {
    margin: 24px 0 0;
    max-width: 650px;
    color: #c4ccef;
    font-size: 18px;
}

.experiments-hero-right {
    display: flex;
    justify-content: center;
}

.week-card {
    width: min(100%, 460px);
    padding: 28px;
    border-radius: 34px;
    background:
        linear-gradient(145deg, rgba(255, 255, 255, 0.15), rgba(255, 255, 255, 0.05)),
        radial-gradient(circle at top, rgba(94, 231, 255, 0.12), transparent 55%);
    border: 1px solid rgba(255, 255, 255, 0.16);
    box-shadow: 0 30px 90px rgba(0, 0, 0, 0.35);
}

.week-card-title {
    color: #dce4ff;
    font-size: 18px;
    font-weight: 800;
}

.week-steps {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
    margin: 26px 0;
}

.week-steps div {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    border-radius: 20px;
    background: rgba(5, 8, 22, 0.38);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.week-steps span {
    width: 34px;
    height: 34px;
    border-radius: 13px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #06101f;
    font-weight: 900;
    background: linear-gradient(135deg, #5ee7ff, #9effc3);
}

.week-steps p {
    margin: 0;
    color: #ffffff;
    font-weight: 800;
}

.week-tip {
    padding: 16px;
    border-radius: 18px;
    color: #cffff0;
    background: rgba(158, 255, 195, 0.10);
    border: 1px solid rgba(158, 255, 195, 0.18);
}

.method-section,
.review-section {
    background: rgba(255, 255, 255, 0.025);
}

.principle-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
}

.principle-card {
    padding: 24px;
    border-radius: 26px;
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid rgba(255, 255, 255, 0.10);
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.principle-card:hover {
    transform: translateY(-4px);
    border-color: rgba(94, 231, 255, 0.35);
}

.principle-card span {
    color: #5ee7ff;
    font-weight: 900;
}

.principle-card h3 {
    margin: 12px 0 8px;
    font-size: 22px;
}

.principle-card p {
    margin: 0;
    color: #b8c1e2;
}

.experiment-list {
    display: grid;
    gap: 30px;
}

.experiment-card {
    padding: 30px;
    border-radius: 34px;
    background:
        linear-gradient(145deg, rgba(255, 255, 255, 0.10), rgba(255, 255, 255, 0.05));
    border: 1px solid rgba(255, 255, 255, 0.10);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.18);
}

.experiment-card.highlight {
    background:
        linear-gradient(145deg, rgba(94, 231, 255, 0.12), rgba(143, 92, 255, 0.08)),
        rgba(255, 255, 255, 0.06);
    border-color: rgba(94, 231, 255, 0.26);
}

.experiment-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 24px;
}

.experiment-label {
    display: inline-flex;
    padding: 5px 12px;
    border-radius: 999px;
    color: #5ee7ff;
    background: rgba(94, 231, 255, 0.12);
    font-size: 13px;
    font-weight: 900;
}

.experiment-header h3 {
    margin: 12px 0 0;
    font-size: 32px;
    line-height: 1.22;
}

.experiment-type {
    flex: 0 0 auto;
    padding: 9px 14px;
    border-radius: 999px;
    color: #ffcc70;
    background: rgba(255, 204, 112, 0.12);
    font-size: 14px;
    font-weight: 900;
}

.experiment-desc {
    margin: 20px 0 0;
    color: #c4ccef;
    font-size: 17px;
}

.experiment-meta-grid {
    margin-top: 22px;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.experiment-meta-grid div {
    padding: 18px;
    border-radius: 22px;
    background: rgba(5, 8, 22, 0.35);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.experiment-meta-grid strong {
    color: #ffffff;
}

.experiment-meta-grid p {
    margin: 8px 0 0;
    color: #b8c1e2;
}

.day-plan,
.template-box,
.avoid-box {
    margin-top: 20px;
    padding: 22px;
    border-radius: 24px;
}

.day-plan {
    background: rgba(94, 231, 255, 0.08);
    border: 1px solid rgba(94, 231, 255, 0.16);
}

.template-box {
    background: rgba(158, 255, 195, 0.09);
    border: 1px solid rgba(158, 255, 195, 0.17);
}

.avoid-box {
    color: #fff4d6;
    background: rgba(255, 204, 112, 0.10);
    border: 1px solid rgba(255, 204, 112, 0.18);
}

.day-plan h4,
.template-box h4 {
    margin: 0 0 12px;
    font-size: 20px;
}

.day-plan-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.day-plan-grid span {
    display: block;
    padding: 13px 14px;
    border-radius: 16px;
    color: #dffcff;
    background: rgba(255, 255, 255, 0.06);
}

.template-box p {
    margin: 0;
    color: #cffff0;
}

.review-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.review-card {
    padding: 24px;
    border-radius: 26px;
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid rgba(255, 255, 255, 0.10);
}

.review-card span {
    color: #5ee7ff;
    font-weight: 900;
}

.review-card h3 {
    margin: 12px 0 8px;
    font-size: 22px;
}

.review-card p {
    margin: 0;
    color: #b8c1e2;
}

.next-box {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 26px;
    padding: 34px;
    border-radius: 34px;
    background:
        linear-gradient(135deg, rgba(94, 231, 255, 0.14), rgba(143, 92, 255, 0.14)),
        rgba(255, 255, 255, 0.07);
    border: 1px solid rgba(255, 255, 255, 0.12);
}

.next-box h2 {
    margin: 0;
    font-size: clamp(28px, 4vw, 42px);
    line-height: 1.2;
}

.next-box p {
    margin: 14px 0 0;
    color: #b8c1e2;
    font-size: 17px;
}

@media (max-width: 980px) {
    .experiments-hero-inner {
        grid-template-columns: 1fr;
    }

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

    .experiment-meta-grid,
    .review-grid {
        grid-template-columns: 1fr;
    }

    .day-plan-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .experiments-hero {
        padding: 58px 16px 62px;
    }

    .experiments-hero-left h1 {
        font-size: 40px;
    }

    .experiments-hero-left p {
        font-size: 16px;
    }

    .week-steps,
    .principle-grid {
        grid-template-columns: 1fr;
    }

    .experiment-card {
        padding: 22px;
    }

    .experiment-header {
        flex-direction: column;
    }

    .experiment-header h3 {
        font-size: 26px;
    }

    .experiment-type {
        align-self: flex-start;
    }

    .next-box {
        flex-direction: column;
        align-items: flex-start;
    }
}