:root {
    --bg: #f4f7f5;
    --panel: #ffffff;
    --text: #1d2520;
    --muted: #64706a;
    --line: #dde5e0;
    --green: #18b985;
    --green-dark: #0d8d65;
    --purple: #7950b2;
    --red: #d44949;
    --amber: #b98119;
    --shadow: 0 18px 50px rgba(28, 43, 35, .09);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    color: var(--text);
    background:
        linear-gradient(120deg, rgba(24, 185, 133, .12), transparent 36%),
        linear-gradient(280deg, rgba(121, 80, 178, .10), transparent 40%),
        var(--bg);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
}

input,
select,
textarea,
button {
    font: inherit;
}

a {
    color: inherit;
    text-decoration: none;
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 5;
    display: flex;
    justify-content: space-between;
    gap: 16px;
    align-items: center;
    padding: 18px clamp(16px, 4vw, 48px);
    background: rgba(255, 255, 255, .86);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(14px);
}

.topbar h1,
.panel h2,
.login-card h1 {
    margin: 0;
    letter-spacing: 0;
}

.topbar h1 {
    font-size: clamp(24px, 3vw, 36px);
}

.eyebrow {
    display: block;
    color: var(--green-dark);
    font-size: 13px;
    font-weight: 800;
    text-transform: uppercase;
}

.topbar nav {
    display: flex;
    gap: 8px;
}

.topbar nav a {
    min-height: 40px;
    padding: 10px 14px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
    color: var(--muted);
    font-weight: 700;
}

.layout {
    width: min(1180px, calc(100% - 24px));
    margin: 24px auto 56px;
}

.panel,
.login-card {
    background: rgba(255, 255, 255, .96);
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.panel {
    padding: clamp(18px, 3vw, 30px);
    margin-bottom: 20px;
}

.section-head {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    align-items: end;
    margin-bottom: 22px;
}

.section-head h2 {
    font-size: clamp(22px, 2.5vw, 30px);
}

.section-head span,
.muted,
label,
.detail-grid span,
.stat span,
.customer-card summary span {
    color: var(--muted);
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 16px;
}

label {
    display: grid;
    gap: 8px;
    font-size: 15px;
    font-weight: 800;
}

input,
select,
textarea {
    width: 100%;
    min-height: 46px;
    padding: 11px 13px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
    color: var(--text);
    outline: none;
    transition: border-color .16s ease, box-shadow .16s ease;
}

textarea {
    resize: vertical;
}

input:focus,
select:focus,
textarea:focus {
    border-color: var(--green);
    box-shadow: 0 0 0 4px rgba(24, 185, 133, .14);
}

.wide {
    grid-column: 1 / -1;
}

.actions,
.payment-form {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
    margin-top: 22px;
}

.payment-form {
    grid-template-columns: 1.4fr 1fr 1fr 1fr auto;
    align-items: end;
}

.btn {
    min-height: 52px;
    border: 0;
    border-radius: 8px;
    padding: 12px 18px;
    color: #fff;
    font-weight: 900;
    cursor: pointer;
}

.btn.primary {
    background: var(--green);
}

.btn.primary:hover {
    background: var(--green-dark);
}

.btn.muted {
    background: var(--purple);
}

.alert {
    padding: 14px 16px;
    margin-bottom: 14px;
    border-radius: 8px;
    font-weight: 800;
}

.alert.success {
    background: rgba(24, 185, 133, .13);
    color: var(--green-dark);
}

.alert.danger {
    background: rgba(212, 73, 73, .12);
    color: var(--red);
}

.table-wrap {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    min-width: 760px;
}

th,
td {
    padding: 14px 12px;
    border-bottom: 1px solid var(--line);
    text-align: left;
}

th {
    color: var(--muted);
    font-size: 13px;
    text-transform: uppercase;
}

.status {
    display: inline-flex;
    align-items: center;
    min-height: 28px;
    padding: 5px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 900;
}

.status.paid {
    background: rgba(24, 185, 133, .14);
    color: var(--green-dark);
}

.status.open {
    background: rgba(185, 129, 25, .14);
    color: var(--amber);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 12px;
    margin-bottom: 20px;
}

.stat {
    min-height: 110px;
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
    box-shadow: var(--shadow);
}

.stat span {
    display: block;
    margin-bottom: 8px;
    font-size: 13px;
    font-weight: 800;
}

.stat strong {
    display: block;
    font-size: clamp(20px, 2vw, 28px);
    line-height: 1.15;
}

.customer-list {
    display: grid;
    gap: 12px;
}

.customer-card {
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
}

.customer-card summary {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    align-items: center;
    padding: 16px;
    cursor: pointer;
    list-style: none;
}

.customer-card summary::-webkit-details-marker {
    display: none;
}

.customer-card summary strong {
    display: block;
    margin-bottom: 4px;
    font-size: 18px;
}

.summary-money {
    display: grid;
    justify-items: end;
    gap: 6px;
}

.summary-money b {
    font-size: 18px;
}

.detail-grid {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 10px;
    padding: 0 16px 16px;
}

.detail-grid div {
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #f9fbfa;
}

.detail-grid span,
.detail-grid b {
    display: block;
}

.detail-grid span {
    margin-bottom: 4px;
    font-size: 12px;
    font-weight: 800;
}

.note,
.customer-card h3,
.payment-list {
    margin: 0 16px 16px;
}

.note {
    padding: 12px;
    border-radius: 8px;
    background: #f9fbfa;
    color: var(--muted);
}

.customer-card h3 {
    font-size: 16px;
}

.payment-list {
    display: grid;
    gap: 8px;
}

.payment-list div {
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: 10px;
    align-items: center;
    padding: 10px 0;
    border-top: 1px solid var(--line);
}

.payment-list em {
    font-style: normal;
    color: var(--green-dark);
    font-weight: 800;
}

.payment-list small {
    grid-column: 1 / -1;
    color: var(--muted);
}

.empty {
    color: var(--muted);
}

.login-page {
    display: grid;
    place-items: center;
    padding: 20px;
}

.login-card {
    width: min(420px, 100%);
    padding: 28px;
}

.brand-mark {
    display: grid;
    place-items: center;
    width: 54px;
    height: 54px;
    margin-bottom: 18px;
    border-radius: 8px;
    background: var(--green);
    color: #fff;
    font-size: 28px;
    font-weight: 900;
}

.login-card p {
    margin: 8px 0 20px;
    color: var(--muted);
}

.stack {
    display: grid;
    gap: 14px;
}

.home-card {
    width: min(520px, 100%);
}

.home-actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

.home-actions .btn {
    display: grid;
    place-items: center;
    text-align: center;
}

@media (max-width: 980px) {
    .payment-form,
    .stats-grid,
    .detail-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 680px) {
    .topbar {
        align-items: flex-start;
        flex-direction: column;
    }

    .topbar nav,
    .actions,
    .home-actions,
    .form-grid,
    .payment-form,
    .stats-grid,
    .detail-grid {
        width: 100%;
        grid-template-columns: 1fr;
    }

    .topbar nav a {
        flex: 1;
        text-align: center;
    }

    .section-head,
    .customer-card summary {
        align-items: flex-start;
        flex-direction: column;
    }

    .summary-money {
        justify-items: start;
    }

    .payment-list div {
        grid-template-columns: 1fr;
    }
}