:root {
  --ink: #080b12;
  --ink-soft: #111723;
  --paper: #f3f4f6;
  --white: #fff;
  --blue: #4f6496;
  --blue-light: #94a9da;
  --sunset: #ef867b;
  --muted: #687284;
  --line: rgba(8, 11, 18, 0.14);
  --display: "Space Grotesk", system-ui, sans-serif;
  --body: "Manrope", system-ui, sans-serif;
  --shell: min(1180px, calc(100vw - 48px));
}

* { box-sizing: border-box; }
html { color-scheme: light; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 400 15px/1.6 var(--body); -webkit-font-smoothing: antialiased; }
a { color: inherit; }
button, input, select, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--sunset); outline-offset: 3px; }
.skip-link { position: fixed; top: 10px; left: 10px; z-index: 20; padding: 10px 14px; background: #fff; transform: translateY(-160%); }
.skip-link:focus { transform: none; }
.billing-header { min-height: 82px; padding: 8px max(24px, calc((100vw - 1180px) / 2)); background: var(--ink); color: #fff; display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.billing-brand { width: 180px; height: 62px; display: flex; align-items: center; }
.billing-brand img { display: block; width: 100%; height: 100%; object-fit: contain; }
.billing-header nav { display: flex; align-items: center; gap: 25px; }
.billing-header nav > a, .billing-header .text-button { color: rgba(255,255,255,.72); font: 700 .72rem var(--display); letter-spacing: .08em; text-decoration: none; text-transform: uppercase; }
.billing-header nav > a:hover, .billing-header .text-button:hover { color: #fff; }
.billing-main { width: var(--shell); min-height: calc(100vh - 160px); margin: 0 auto; padding: 52px 0 90px; }
.page-kicker { margin-bottom: 20px; color: var(--blue); font: 700 .63rem var(--display); letter-spacing: .16em; text-transform: uppercase; }
.eyebrow { margin: 0 0 12px; color: var(--blue); font: 700 .63rem var(--display); letter-spacing: .15em; text-transform: uppercase; }
h1, h2, h3 { margin-top: 0; font-family: var(--display); line-height: 1.08; }
h1 { margin-bottom: 18px; font-size: clamp(2.7rem, 5vw, 5.3rem); letter-spacing: -.055em; }
h1 em { color: var(--blue); font-style: normal; }
h2 { margin-bottom: 12px; font-size: 1.65rem; letter-spacing: -.03em; }
h3 { margin-bottom: 6px; font-size: 1.05rem; }
p { margin-top: 0; }
.panel { border: 1px solid var(--line); border-radius: 20px; background: #fff; box-shadow: 0 22px 55px rgba(22,35,60,.08); }
.auth-shell { min-height: 640px; display: grid; grid-template-columns: 1fr minmax(380px, .72fr); align-items: center; gap: clamp(60px, 9vw, 130px); }
.auth-copy > p:not(.eyebrow) { max-width: 570px; color: var(--muted); font-size: 1rem; }
.back-link { color: var(--blue); font-weight: 700; text-decoration: none; }
.auth-panel, .form-panel { padding: clamp(28px, 4vw, 46px); display: grid; gap: 18px; }
.auth-panel h2, .form-panel h2 { margin-bottom: 4px; }
label { display: grid; gap: 8px; }
label > span, .invoice-meta span, .invoice-service span { color: var(--muted); font: 700 .63rem var(--display); letter-spacing: .12em; text-transform: uppercase; }
input, select, textarea { width: 100%; min-height: 52px; border: 1px solid var(--line); border-radius: 11px; background: #f8f9fb; padding: 12px 14px; color: var(--ink); }
textarea { resize: vertical; }
input:focus, select:focus, textarea:focus { border-color: var(--blue); background: #fff; outline: 0; box-shadow: 0 0 0 4px rgba(79,100,150,.1); }
.billing-main input[type="checkbox"], .billing-main input[type="radio"] { width: 18px; height: 18px; min-height: 18px; padding: 0; margin: 0; flex: 0 0 18px; accent-color: var(--blue); cursor: pointer; vertical-align: middle; }
.checkbox-label { display: flex; align-items: center; gap: 10px; min-height: 44px; margin: 8px 0 14px; cursor: pointer; }
.checkbox-label > span { font: inherit; color: var(--muted); font-size: .85rem; letter-spacing: normal; text-transform: none; }
small, .form-help { color: var(--muted); font-size: .76rem; }
.button { min-height: 47px; border: 1px solid var(--ink); border-radius: 999px; padding: 0 20px; display: inline-flex; align-items: center; justify-content: center; gap: 10px; font: 700 .71rem var(--display); letter-spacing: .07em; text-decoration: none; text-transform: uppercase; cursor: pointer; }
.button-primary { background: var(--ink); color: #fff; }
.button-primary:hover { background: var(--blue); border-color: var(--blue); }
.button-secondary { background: #fff; color: var(--ink); }
.button-secondary:hover { background: var(--ink); color: #fff; }
.button-small { min-height: 42px; border-radius: 10px; }
.button:disabled { opacity: .45; cursor: not-allowed; }
.inline-form { display: inline; margin: 0; }
.text-button { border: 0; background: transparent; padding: 0; cursor: pointer; }
.text-danger { color: #a33d48; }
.flash { margin: 0 0 22px; border-left: 4px solid var(--blue); border-radius: 8px; padding: 14px 16px; background: #e9eef8; }
.flash-success { border-color: #2f8068; background: #e3f3ed; }
.flash-error { border-color: #b8404d; background: #f9e8ea; }
.account-hero { border-radius: 24px; padding: clamp(35px, 6vw, 70px); background: var(--ink); color: #fff; display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 45px; }
.account-hero h1 { margin: 0 0 8px; font-size: clamp(2.4rem, 5vw, 4.8rem); }
.account-hero p { color: rgba(255,255,255,.55); }
.balance-card { min-width: 275px; border: 1px solid rgba(255,255,255,.15); border-radius: 18px; padding: 24px; display: grid; background: rgba(255,255,255,.05); }
.balance-card span { color: rgba(255,255,255,.55); font-size: .72rem; }
.balance-card strong { font: 600 2.4rem var(--display); }
.balance-card small { color: rgba(255,255,255,.5); }
.section-heading { margin: 72px 0 24px; display: flex; align-items: end; justify-content: space-between; gap: 50px; }
.section-heading h1, .section-heading h2 { margin: 0; }
.section-heading h2 { font-size: clamp(2rem, 4vw, 3.6rem); }
.section-heading > p { max-width: 440px; margin: 0; color: var(--muted); }
.invoice-list { display: grid; gap: 12px; }
.invoice-row { border: 1px solid var(--line); border-radius: 16px; padding: 22px; background: #fff; display: grid; grid-template-columns: 1fr auto 130px auto; align-items: center; gap: 22px; }
.invoice-row h3 { margin: 3px 0; }
.invoice-row p, .admin-invoice p { margin: 0; color: var(--muted); font-size: .77rem; }
.invoice-row > strong, .admin-invoice-summary > strong { font: 600 1.15rem var(--display); text-align: right; }
.invoice-number { color: var(--blue); font: 700 .6rem var(--display); letter-spacing: .13em; }
.status { width: fit-content; border-radius: 999px; padding: 6px 9px; background: #e7ebef; color: #46505e; font: 700 .58rem var(--display); letter-spacing: .09em; text-transform: uppercase; white-space: nowrap; }
.status-paid { background: #daf0e7; color: #1d6b55; }
.status-overdue { background: #fae2e4; color: #a22f3c; }
.status-open, .status-sent { background: #e4eaf8; color: #3a5084; }
.status-void { background: #ececef; color: #686b73; }
.empty-state { padding: 42px; text-align: center; }
.empty-state p { margin: 0; color: var(--muted); }
.narrow-shell { max-width: 760px; margin: 0 auto; }
.invoice-sheet { border: 1px solid var(--line); border-radius: 24px; padding: clamp(28px, 6vw, 72px); background: #fff; box-shadow: 0 24px 70px rgba(22,35,60,.09); }
.invoice-sheet-head { padding-bottom: 35px; border-bottom: 1px solid var(--line); display: flex; align-items: start; justify-content: space-between; gap: 30px; }
.invoice-sheet-head h1 { margin: 0; font-size: clamp(2.3rem, 5vw, 4.5rem); }
.invoice-meta { padding: 32px 0; display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 30px; }
.invoice-meta div { display: grid; align-content: start; gap: 4px; }
.invoice-meta p { margin: 0; color: var(--muted); }
.invoice-service { border-block: 1px solid var(--line); padding: 30px 0; display: flex; justify-content: space-between; gap: 35px; }
.invoice-service h2 { margin: 5px 0 9px; }
.invoice-service p { max-width: 700px; margin: 0; color: var(--muted); }
.invoice-service > strong { font: 600 1.2rem var(--display); }
.invoice-total { padding: 28px 0; display: flex; align-items: center; justify-content: flex-end; gap: 45px; }
.invoice-total strong { font: 600 2.2rem var(--display); }
.invoice-actions { padding-top: 22px; display: flex; justify-content: space-between; gap: 20px; }
.admin-heading { margin-bottom: 38px; display: flex; align-items: end; justify-content: space-between; gap: 40px; }
.admin-heading h1 { margin-bottom: 12px; }
.admin-heading p:last-child { max-width: 700px; color: var(--muted); }
.metric-grid { margin-bottom: 25px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.metric-grid article { border: 1px solid var(--line); border-radius: 15px; padding: 22px; background: #fff; display: grid; gap: 4px; }
.metric-grid span { color: var(--muted); font-size: .72rem; }
.metric-grid strong { font: 600 1.8rem var(--display); }
.admin-grid { display: grid; grid-template-columns: .72fr 1.28fr; align-items: start; gap: 22px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.credentials-card { margin-bottom: 35px; border: 2px solid var(--sunset); border-radius: 18px; padding: 25px; background: #fff7f5; display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
.credentials-card p { margin-bottom: 0; color: var(--muted); }
.credentials-card dl { margin: 0; display: grid; gap: 12px; }
.credentials-card dl div { border: 1px solid var(--line); border-radius: 10px; padding: 12px; background: #fff; }
.credentials-card dt { color: var(--muted); font-size: .65rem; }
.credentials-card dd { margin: 2px 0 0; font-weight: 700; overflow-wrap: anywhere; }
.credential-value { font-family: ui-monospace, monospace; }
.customer-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 15px; }
.customer-card { padding: 22px; display: grid; gap: 20px; box-shadow: none; }
.customer-card.is-suspended { opacity: .68; }
.customer-card h3 { margin: 9px 0 3px; }
.customer-card p { margin: 0; color: var(--muted); font-size: .77rem; overflow-wrap: anywhere; }
.customer-card dl { margin: 0; display: flex; gap: 28px; }
.customer-card dl div { display: grid; }
.customer-card dt { color: var(--muted); font-size: .63rem; text-transform: uppercase; }
.customer-card dd { margin: 0; font: 600 1rem var(--display); }
.card-actions { border-top: 1px solid var(--line); padding-top: 14px; display: flex; justify-content: space-between; gap: 18px; }
.card-actions .text-button { font-size: .7rem; font-weight: 700; }
.admin-invoices { display: grid; gap: 14px; }
.admin-invoice { padding: 22px; box-shadow: none; }
.admin-invoice-summary { display: grid; grid-template-columns: 1fr auto 120px; align-items: center; gap: 22px; }
.admin-invoice-summary h3 { margin: 2px 0 4px; }
.admin-invoice-summary h3 a { text-decoration-thickness: 1px; text-underline-offset: 3px; }
.invoice-editor { margin-top: 18px; padding-top: 18px; border-top: 1px solid var(--line); display: grid; grid-template-columns: 150px 170px 1fr auto; align-items: end; gap: 12px; }
.invoice-editor input, .invoice-editor select { min-height: 42px; padding: 8px 10px; font-size: .78rem; }
.billing-footer { min-height: 78px; padding: 22px max(24px, calc((100vw - 1180px) / 2)); background: var(--ink); color: rgba(255,255,255,.5); display: flex; justify-content: space-between; gap: 30px; font-size: .72rem; }
.billing-footer a { color: #fff; text-decoration: none; }

@media (max-width: 920px) {
  .auth-shell, .admin-grid { grid-template-columns: 1fr; }
  .auth-shell { padding-top: 35px; }
  .metric-grid, .customer-grid { grid-template-columns: repeat(2, 1fr); }
  .invoice-row { grid-template-columns: 1fr auto; }
  .invoice-row > strong { text-align: left; }
  .invoice-editor { grid-template-columns: 1fr 1fr; }
  .payment-field { grid-column: 1 / -1; }
}

@media (max-width: 620px) {
  :root { --shell: calc(100vw - 28px); }
  .billing-header { align-items: flex-start; flex-direction: column; padding: 15px; }
  .billing-header nav { width: 100%; justify-content: space-between; gap: 12px; }
  .billing-main { padding-top: 30px; }
  .account-hero, .credentials-card { grid-template-columns: 1fr; }
  .balance-card { min-width: 0; }
  .section-heading, .admin-heading { align-items: flex-start; flex-direction: column; }
  .metric-grid, .customer-grid, .field-row { grid-template-columns: 1fr; }
  .invoice-row, .admin-invoice-summary, .invoice-editor { grid-template-columns: 1fr; }
  .invoice-meta { grid-template-columns: 1fr; }
  .invoice-service { flex-direction: column; }
  .invoice-actions { flex-direction: column-reverse; }
  .billing-footer { flex-direction: column; }
}