:root {
    --bg: #f1f5f9;
    --surface: #ffffff;
    --border: #e2e8f0;
    --text: #0f172a;
    --muted: #64748b;
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --success-bg: #dcfce7;
    --success-text: #166534;
    --info-bg: #dbeafe;
    --info-text: #1e40af;
    --warn-bg: #fef9c3;
    --warn-text: #854d0e;
    --danger-bg: #fee2e2;
    --danger-text: #991b1b;
    --neutral-bg: #f1f5f9;
    --neutral-text: #475569;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

a { color: var(--primary); }
code, .mono { font-family: ui-monospace, "Cascadia Mono", Consolas, monospace; }
.text-muted { color: var(--muted); }
.small { font-size: 0.85rem; }

/* ---- Navbar ---- */
.navbar {
    background: #111827;
    color: #fff;
    padding: 0.75rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem;
}
.navbar .brand {
    font-weight: 700;
    font-size: 1.05rem;
    color: #fff;
    text-decoration: none;
}
.navbar nav a {
    color: #cbd5e1;
    text-decoration: none;
    margin-left: 1.25rem;
    font-size: 0.95rem;
}
.navbar nav a:hover { color: #fff; }
.navbar nav a.active { color: #fff; font-weight: 600; }

/* ---- Layout ---- */
.container {
    max-width: 960px;
    margin: 2rem auto;
    padding: 0 1rem;
}
.page-heading { margin-bottom: 1.5rem; }
.page-heading h1 { margin: 0 0 0.25rem; font-size: 1.6rem; }

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}

/* ---- Dashboard option cards ---- */
.option-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
}
.option-card {
    display: block;
    text-decoration: none;
    color: inherit;
    padding: 2rem 1.5rem;
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    background: var(--surface);
    text-align: center;
    transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}
.option-card:hover {
    border-color: var(--primary);
    box-shadow: 0 6px 16px rgba(79, 70, 229, 0.15);
    transform: translateY(-2px);
}
.option-card .icon { font-size: 2.5rem; margin-bottom: 0.5rem; }
.option-card h2 { margin: 0 0 0.35rem; font-size: 1.2rem; }
.option-card p { margin: 0; font-size: 0.9rem; }

/* ---- Forms ---- */
.field { margin-bottom: 1rem; }
.field label {
    display: block;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 0.3rem;
}
input[type="text"],
input[type="email"],
input[type="number"],
input[type="password"] {
    width: 100%;
    padding: 0.6rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    font-size: 1rem;
    font-family: inherit;
    color: var(--text);
    background: #fff;
}
input:focus {
    outline: 2px solid var(--primary);
    outline-offset: 1px;
    border-color: var(--primary);
}

/* ---- Buttons ---- */
.btn {
    display: inline-block;
    padding: 0.55rem 1rem;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    background: #fff;
    color: var(--text);
    font-size: 0.95rem;
    font-family: inherit;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.15s ease;
}
.btn:hover { background: var(--neutral-bg); }
.btn-primary {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}
.btn-primary:hover { background: var(--primary-hover); }
.btn-block { display: block; width: 100%; text-align: center; }
.btn-small { padding: 0.25rem 0.6rem; font-size: 0.8rem; }

/* ---- Alerts ---- */
.alert {
    border-radius: 0.5rem;
    padding: 0.8rem 1rem;
    margin-bottom: 1rem;
    font-size: 0.92rem;
}
.alert ul { margin: 0; padding-left: 1.2rem; }
.alert-success { background: var(--success-bg); color: var(--success-text); }
.alert-error   { background: var(--danger-bg);  color: var(--danger-text); }
.alert-warning { background: var(--warn-bg);    color: var(--warn-text); }

/* ---- Success card on create-invoice ---- */
.success-card { text-align: center; }
.success-icon { font-size: 3rem; }
.success-card h2 { margin: 0.5rem 0; }
.link-row {
    display: flex;
    gap: 0.5rem;
    max-width: 560px;
    margin: 1rem auto 0.35rem;
}
.link-row input {
    flex: 1;
    font-family: ui-monospace, Consolas, monospace;
    font-size: 0.85rem;
}
.success-card .actions {
    display: flex;
    gap: 0.6rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 1rem;
}

/* ---- Table ---- */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td {
    text-align: left;
    padding: 0.65rem 0.75rem;
    border-bottom: 1px solid var(--border);
    font-size: 0.92rem;
    vertical-align: middle;
}
th {
    color: var(--muted);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
tbody tr:last-child td { border-bottom: none; }

/* ---- Status badges ---- */
.badge {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    white-space: nowrap;
}
.badge-paid      { background: var(--success-bg); color: var(--success-text); }
.badge-sent      { background: var(--info-bg);    color: var(--info-text); }
.badge-draft     { background: var(--neutral-bg); color: var(--neutral-text); }
.badge-cancelled { background: var(--danger-bg);  color: var(--danger-text); }

/* ---- Login / setup ---- */
.login-wrap {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}
.login-card {
    width: 100%;
    max-width: 400px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.9rem;
    padding: 2rem;
    box-shadow: 0 4px 16px rgba(15, 23, 42, 0.06);
}
.login-card h1 { margin: 0.25rem 0 0.25rem; font-size: 1.4rem; }
.login-brand {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}