:root {
    --bg: #f5f7fb;
    --surface: #ffffff;
    --text: #111827;
    --muted: #6b7280;
    --border: #e5e7eb;
    --primary: #dc2626;
    --primary-dark: #b91c1c;
    --secondary: #f3f4f6;
    --success-bg: #dcfce7;
    --success-text: #166534;
    --danger-bg: #fee2e2;
    --danger-text: #991b1b;
    --shadow: 0 10px 30px rgba(17,24,39,.08);
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

h1, h2, p { margin-top: 0; }
h1 { margin-bottom: 2px; font-size: 26px; }
h2 { margin-bottom: 6px; font-size: 20px; }
a { text-decoration: none; }

.container {
    width: min(1100px, calc(100% - 28px));
    margin: 0 auto;
    padding: 24px 0;
}

.page-header,
.section-header,
.brand,
.actions {
    display: flex;
    align-items: center;
}

.page-header,
.section-header {
    justify-content: space-between;
    gap: 16px;
}

.page-header { margin-bottom: 20px; }
.brand { gap: 12px; }
.actions { gap: 10px; flex-wrap: wrap; }

.brand-mark {
    width: 46px;
    height: 46px;
    display: grid;
    place-items: center;
    border-radius: 14px;
    background: var(--primary);
    color: white;
    font-size: 22px;
    font-weight: 900;
}

.muted {
    color: var(--muted);
    font-size: 14px;
}

.two-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    align-items: start;
}

.card {
    margin-bottom: 20px;
    padding: 20px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 18px;
    box-shadow: var(--shadow);
}

label {
    display: block;
    margin: 14px 0 7px;
    font-size: 13px;
    font-weight: 800;
}

input,
select,
textarea {
    width: 100%;
    padding: 12px 13px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: white;
    color: var(--text);
    font: inherit;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(220,38,38,.10);
}

textarea {
    min-height: 130px;
    resize: vertical;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 12px;
}

.money-field { position: relative; }

.money-field span {
    position: absolute;
    top: 50%;
    left: 13px;
    transform: translateY(-50%);
    color: var(--muted);
    font-weight: 800;
}

.money-field input {
    padding-left: 42px;
    font-size: 22px;
    font-weight: 900;
}

.button {
    min-height: 44px;
    padding: 11px 15px;
    border: 0;
    border-radius: 12px;
    cursor: pointer;
    font: inherit;
    font-size: 14px;
    font-weight: 800;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.button-primary { background: var(--primary); color: white; }
.button-primary:hover { background: var(--primary-dark); }
.button-secondary { background: var(--secondary); color: var(--text); }
.button-success { background: var(--success-bg); color: var(--success-text); }
.button-danger { background: var(--danger-bg); color: var(--danger-text); }
.button-full { width: 100%; margin-top: 14px; }

.form-actions {
    justify-content: flex-start;
    margin-top: 14px;
}

.alert {
    margin: 12px 0;
    padding: 10px 12px;
    border-radius: 10px;
    font-size: 13px;
}

.alert-error {
    background: #fef2f2;
    color: #b91c1c;
    border: 1px solid #fecaca;
}

.hidden { display: none !important; }

.list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 14px;
}

.list-item {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    padding: 11px 12px;
    border: 1px solid var(--border);
    border-radius: 12px;
}

.list-item small {
    display: block;
    margin-top: 3px;
    color: var(--muted);
    word-break: break-all;
}

.list-item-actions {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.list-item-actions .button {
    min-height: 36px;
    padding: 7px 9px;
    font-size: 12px;
}

.result-card { text-align: center; }

.result-amount {
    margin: 10px 0 2px;
    font-size: 34px;
    font-weight: 900;
}

.qr-wrapper {
    display: inline-flex;
    margin: 14px 0;
    padding: 14px;
    background: white;
    border: 1px solid var(--border);
    border-radius: 16px;
}

#qrcode {
    width: 260px;
    min-height: 260px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#qrcode img,
#qrcode canvas {
    max-width: 100%;
    height: auto !important;
}

.result-card label { text-align: left; }

.result-actions {
    justify-content: center;
    margin-top: 10px;
}

.status-badge {
    display: inline-block;
    margin-top: 10px;
    padding: 5px 9px;
    border-radius: 999px;
    background: var(--secondary);
    color: #4b5563;
    font-size: 11px;
    font-weight: 800;
}

.login-page {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 18px;
}

.login-card {
    width: min(420px, 100%);
    padding: 24px;
    background: white;
    border: 1px solid var(--border);
    border-radius: 18px;
    box-shadow: var(--shadow);
}

.login-card .brand-mark { margin-bottom: 16px; }

@media (max-width: 800px) {
    .container {
        width: min(100% - 20px, 1100px);
        padding: 14px 0;
    }

    .two-columns {
        grid-template-columns: 1fr;
    }

    .card {
        padding: 16px;
    }

    #qrcode {
        width: 230px;
        min-height: 230px;
    }
}