:root {
    --bg: #f4f7fb;
    --surface: #ffffff;
    --surface-soft: #f8fbff;
    --line: #e3e9f2;
    --text: #0f172a;
    --muted: #5f6f86;
    --accent: #0a66c2;
    --accent-strong: #084f96;
    --danger: #c0392b;
    --ok: #1f8f56;
    --radius: 14px;
    --font: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: var(--font);
    background:
        radial-gradient(1300px 520px at 0% -10%, #dcecff 0%, transparent 62%),
        radial-gradient(900px 400px at 100% -5%, #eef5ff 0%, transparent 60%),
        var(--bg);
    color: var(--text);
    line-height: 1.5;
}

.shell {
    max-width: 1080px;
    margin: 0 auto;
    padding: 1.5rem 1.25rem 2.5rem;
}

.top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.25rem;
    background: rgba(255, 255, 255, 0.88);
    border: 1px solid rgba(255, 255, 255, 0.45);
    border-radius: 999px;
    padding: 0.75rem 1rem 0.75rem 1.1rem;
    box-shadow: 0 16px 40px rgba(10, 102, 194, 0.12);
    backdrop-filter: blur(8px);
}

.brand {
    font-weight: 800;
    letter-spacing: 0.01em;
    font-size: 1rem;
    color: #0a3a78;
}

.brand span {
    font-weight: 600;
    color: var(--muted);
    margin-left: 0.35rem;
}

.main {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.card {
    background: linear-gradient(180deg, var(--surface), var(--surface-soft));
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 1.35rem 1.35rem 1.2rem;
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
}

.card h1,
.card h2 {
    margin: 0 0 0.5rem;
    font-size: 1.35rem;
}

.card h2 {
    font-size: 1.15rem;
    color: #0b3f81;
}

.muted {
    color: var(--muted);
    margin-top: 0;
    font-size: 0.95rem;
}

.small {
    font-size: 0.85rem;
    color: var(--muted);
}

.form {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    margin-top: 1rem;
}

.form label {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    font-size: 0.88rem;
    color: #4f6078;
}

input {
    border-radius: 10px;
    border: 1px solid #cfd9e7;
    background: #fff;
    color: #13233a;
    padding: 0.58rem 0.72rem;
    font-size: 1rem;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input:focus {
    outline: none;
    border-color: #86b7ed;
    box-shadow: 0 0 0 3px rgba(10, 102, 194, 0.12);
}

input.readonly {
    opacity: 0.9;
    cursor: not-allowed;
    background: #f3f6fb;
}

.btn {
    border: none;
    border-radius: 10px;
    padding: 0.6rem 1rem;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    align-self: flex-start;
}

.btn.primary {
    background: linear-gradient(180deg, #1174da, var(--accent));
    color: #fff;
    box-shadow: 0 8px 20px rgba(10, 102, 194, 0.28);
}

.btn.secondary {
    background: #eaf3ff;
    color: var(--accent);
    border: 1px solid #b9d5f7;
}

.btn.ghost {
    background: #fff;
    color: #3d506e;
    border: 1px solid #d0d9e6;
}

.error {
    color: var(--danger);
    font-size: 0.9rem;
    margin: 0;
}

.msg {
    font-size: 0.9rem;
    margin: 0;
}

.msg.ok {
    color: var(--ok);
}

.msg.err {
    color: var(--danger);
}

.hidden {
    display: none !important;
}

.grid {
    display: grid;
    gap: 1.25rem;
}

@media (min-width: 880px) {
    .grid {
        grid-template-columns: 1fr;
    }
}

.stretch {
    min-height: 100%;
}

.grid-form {
    display: grid;
    gap: 0.75rem;
}

.row-2 {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 0.75rem;
}

.mt {
    margin-top: 0.25rem;
}

.invoice-list {
    list-style: none;
    padding: 0;
    margin: 1rem 0 0;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.invoice-list li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.65rem 0.75rem;
    background: #fff;
    border-radius: 10px;
    border: 1px solid #dce5f2;
}

.invoice-meta {
    font-size: 0.85rem;
    color: #687a93;
}

code {
    font-size: 0.85rem;
    word-break: break-all;
    color: #1d3356;
}

.foot {
    margin-top: 1.75rem;
    color: var(--muted);
    font-size: 0.82rem;
}

a.download {
    color: var(--accent);
    font-weight: 600;
    text-decoration: none;
}

a.download:hover {
    text-decoration: underline;
}