.billing-page {
    margin: 0 auto;
    max-width: 92rem;
    padding: clamp(2rem, 5vw, 4.75rem) clamp(1rem, 4vw, 3.5rem) 6rem;
}

.billing-heading {
    align-items: end;
    display: flex;
    gap: 2rem;
    justify-content: space-between;
    margin-bottom: 2rem;
}

.billing-heading h1 {
    font-size: clamp(2.8rem, 7vw, 6.2rem);
    letter-spacing: -0.055em;
    max-width: 12ch;
}

.billing-heading p { max-width: 65ch; }

.billing-health {
    border: 1px solid var(--line-strong);
    border-radius: 999px;
    font-weight: 800;
    padding: .65rem 1rem;
    white-space: nowrap;
}

.billing-health.recovered { border-color: color-mix(in srgb, var(--success) 55%, var(--line)); color: var(--success); }
.billing-health.retryscheduled { border-color: color-mix(in srgb, #fbbf24 55%, var(--line)); color: #fbbf24; }
.billing-health.exhausted, .billing-health.producerreview { border-color: color-mix(in srgb, var(--danger) 55%, var(--line)); color: var(--danger); }

.billing-message, .billing-empty, .billing-metrics, .billing-card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 1.3rem;
    box-shadow: var(--shadow);
}

.billing-message { border-color: color-mix(in srgb, var(--cyan) 45%, var(--line)); display: grid; gap: .3rem; margin-bottom: 1.25rem; padding: 1rem 1.2rem; }
.billing-message small { color: var(--muted); }
.billing-empty { padding: clamp(2rem, 5vw, 4rem); text-align: center; }

.billing-metrics {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-bottom: 1.3rem;
    overflow: hidden;
}

.billing-metrics > div { display: grid; gap: .45rem; padding: 1.2rem; }
.billing-metrics > div + div { border-left: 1px solid var(--line); }
.billing-metrics span { color: var(--muted); font-size: .78rem; letter-spacing: .08em; text-transform: uppercase; }

.billing-grid {
    display: grid;
    gap: 1.3rem;
    grid-template-columns: minmax(0, 1.2fr) minmax(18rem, .8fr);
}

.billing-card { padding: clamp(1.25rem, 3vw, 2rem); }
.renewal-card { grid-row: span 2; }
.billing-card-heading { align-items: start; display: flex; gap: 1rem; justify-content: space-between; }
.billing-card-heading h2 { font-size: clamp(1.7rem, 3vw, 2.6rem); margin: .35rem 0 0; }
.renewal-value { color: var(--cyan); font-size: 1.15rem; }
.billing-notice, .billing-readonly { background: var(--surface-raised); border-left: .2rem solid var(--cyan); border-radius: .7rem; padding: .9rem 1rem; }
.billing-readonly { display: grid; gap: .35rem; }
.billing-readonly span { color: var(--muted); }

.billing-form { border-top: 1px solid var(--line); display: grid; gap: .8rem; margin-top: 1.3rem; padding-top: 1.3rem; }
.billing-form label { display: grid; gap: .4rem; }
.billing-form label span { font-weight: 750; }
.billing-form input { background: var(--page-soft); border: 1px solid var(--line); border-radius: .65rem; color: var(--text); font: inherit; max-width: 22rem; min-height: 2.9rem; padding: .65rem .75rem; }
.billing-form button { align-items: center; background: linear-gradient(135deg, var(--primary), var(--primary-deep)); border: 0; border-radius: .75rem; color: white; display: flex; font: inherit; font-weight: 800; gap: 1rem; justify-content: space-between; min-height: 3.2rem; padding: .75rem 1rem; }
.billing-form button small { font-weight: 500; opacity: .8; }
.billing-form.compact button { background: var(--danger-surface); border: 1px solid var(--danger); color: var(--danger); }

.change-card h2 { font-size: clamp(1.4rem, 2.5vw, 2.1rem); line-height: 1.2; }
.billing-signal { background: var(--cyan); border-radius: 50%; box-shadow: 0 0 0 .4rem color-mix(in srgb, var(--cyan) 14%, transparent); height: .7rem; width: .7rem; }
.billing-signal.recovered { background: var(--success); }
.billing-signal.exhausted, .billing-signal.producerreview { background: var(--danger); }
.payment-card code { color: var(--muted); overflow-wrap: anywhere; }

.billing-form input:focus-visible, .billing-form button:focus-visible { outline: .18rem solid var(--cyan); outline-offset: .15rem; }

@media (max-width: 68rem) {
    .billing-grid { grid-template-columns: 1fr; }
    .renewal-card { grid-row: auto; }
    .billing-metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .billing-metrics > div:nth-child(3) { border-left: 0; border-top: 1px solid var(--line); }
    .billing-metrics > div:nth-child(4) { border-top: 1px solid var(--line); }
}

@media (max-width: 44rem) {
    .billing-heading, .billing-card-heading { align-items: start; display: grid; }
    .billing-metrics { grid-template-columns: 1fr; }
    .billing-metrics > div + div, .billing-metrics > div:nth-child(3) { border-left: 0; border-top: 1px solid var(--line); }
}

@media (prefers-reduced-motion: reduce) {
    .billing-form button { transition: none; }
}