.btn {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 50px;
    padding: 14px 26px;
    border-radius: 999px;
    font-weight: 800;
    isolation: isolate;
    transition: color 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease, background 0.3s ease;
}

.btn::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;
    border-radius: inherit;
    transition: opacity 0.3s ease, filter 0.3s ease;
}

.btn-primary {
    color: var(--color-white);
    box-shadow:
        0 0 0 1px rgba(255, 255, 255, 0.08) inset,
        0 14px 42px rgba(31, 182, 255, 0.24);
}

.btn-primary::before {
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-2));
}

.btn-primary:hover {
    box-shadow:
        0 0 0 1px rgba(255, 255, 255, 0.16) inset,
        0 0 30px rgba(31, 182, 255, 0.38),
        0 18px 54px rgba(0, 194, 168, 0.22);
}

.btn-primary:hover::before {
    filter: saturate(1.25) brightness(1.06);
}

.btn-secondary {
    color: var(--color-white);
    border: 1px solid rgba(255, 255, 255, 0.28);
    box-shadow: 0 0 0 rgba(31, 182, 255, 0);
}

.btn-secondary::before {
    background: linear-gradient(
        135deg,
        rgba(31, 182, 255, 0.12),
        rgba(0, 194, 168, 0.08)
    );
    opacity: 0.45;
}

.btn-secondary:hover {
    border-color: rgba(31, 182, 255, 0.78);
    box-shadow:
        0 0 24px rgba(31, 182, 255, 0.2),
        0 0 44px rgba(0, 194, 168, 0.1);
}

.btn-secondary:hover::before {
    opacity: 0.8;
}

.kpi-card {
    padding: 28px;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(16px);
    transition: box-shadow 0.35s ease, border-color 0.35s ease;
}

.kpi-number {
    display: block;
    font-size: 42px;
    line-height: 1;
    font-weight: 800;
}

.kpi-label {
    display: block;
    margin-top: 10px;
    color: rgba(255, 255, 255, 0.72);
    font-size: 15px;
}