:root {
    --bg: #f9f9f9;
    --surface: #ffffff;
    --ink: #0f0d23;
    --muted: #74808c;
    --line: #dddddd;
    --accent: #0069b7;
    --accent-hover: #0e5da1;
    --accent-soft: #e2eaf5;
    --error: #b13535;

    --radius: 10px;
    --radius-sm: 6px;

    --shadow-sm: 0 1px 2px rgba(16, 34, 47, .06);
    --shadow-md: 0 8px 24px rgba(16, 34, 47, .08);

    --font: "Segoe UI", system-ui, -apple-system, "Inter", sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
    font-size: 16px;
    line-height: 1.55;
}

.page {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.topbar {
    background: var(--surface);
    border-bottom: 1px solid var(--line);
    padding: .85rem 1.5rem;
    display: flex;
    align-items: center;
}

.brand {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
}

.brand-logo {
    height: 28px;
    width: auto;
    max-width: 220px;
    object-fit: contain;
    display: block;
}

.content {
    flex: 1;
    display: flex;
    justify-content: center;
    padding: 3rem 1.25rem;
}

.footer {
    padding: 1.5rem;
    text-align: center;
}

.card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 2rem;
    width: 100%;
    max-width: 480px;
    height: fit-content;
    box-shadow: 0 1px 2px rgba(15, 23, 42, .06);
}

h1 {
    font-size: 1.4rem;
    margin: 0 0 .5rem;
    color: var(--ink);
}

.muted {
    color: var(--muted);
    font-size: .95rem;
}

.label {
    display: block;
    font-weight: 600;
    font-size: .9rem;
    margin: 1.25rem 0 .35rem;
    color: var(--ink);
}

.input {
    width: 100%;
    padding: .65rem .75rem;
    border: 1px solid var(--line);
    border-radius: 8px;
    font-size: 1rem;
    color: var(--ink);
    background: #fff;
}

    .input:focus {
        outline: 2px solid var(--accent);
        outline-offset: 1px;
        border-color: var(--accent);
    }

.btn {
    margin-top: 1.25rem;
    width: 100%;
    padding: .7rem 1rem;
    border: 0;
    border-radius: 8px;
    background: var(--accent);
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
}

    .btn:hover:not(:disabled) {
        background: var(--accent-hover);
    }

    .btn:disabled {
        opacity: .6;
        cursor: default;
    }

.error, .validation-message {
    color: var(--error);
    font-size: .9rem;
    margin-top: .5rem;
    display: block;
}

.summary {
    margin: 1.5rem 0 0;
    padding: 0;
    border-top: 1px solid var(--line);
}

    .summary > div {
        display: flex;
        justify-content: space-between;
        gap: 1rem;
        padding: .7rem 0;
        border-bottom: 1px solid var(--line);
    }

    .summary dt {
        color: var(--muted);
        font-size: .9rem;
        margin: 0;
    }

    .summary dd {
        margin: 0;
        font-weight: 600;
    }

.summary-subtext {
    display: block;
    width: 100%;
    color: var(--muted);
    font-size: .8rem;
    font-weight: 400;
    margin-top: .15rem;
}

.amount {
    font-size: 1.15rem;
    color: var(--accent);
}

code {
    background: var(--accent-soft);
    color: #12306e;
    padding: .1rem .35rem;
    border-radius: 4px;
    font-size: .85em;
}