* { box-sizing: border-box; }
body {
    font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
    background: #f4f5f7;
    color: #23272f;
    margin: 0;
}
header.app-header {
    background: #23272f;
    color: #fff;
    padding: 0.8rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
header.app-header a { color: #fff; text-decoration: none; margin-right: 1.2rem; }
header.app-header a.brand { font-weight: bold; font-size: 1.05rem; }
main {
    max-width: 960px;
    margin: 1.5rem auto;
    padding: 0 1rem;
}
.card {
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    padding: 1.25rem 1.5rem;
    margin-bottom: 1.25rem;
}
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 0.5rem 0.6rem; border-bottom: 1px solid #e5e7eb; font-size: 0.92rem; }
th { color: #6b7280; font-weight: 600; }
.btn {
    display: inline-block;
    padding: 0.45rem 0.9rem;
    border-radius: 6px;
    background: #2563eb;
    color: #fff;
    text-decoration: none;
    border: none;
    font-size: 0.9rem;
    cursor: pointer;
}
.btn.secondary { background: #6b7280; }
.btn.danger { background: #dc2626; }
form.inline { display: inline; }
label { display: block; font-size: 0.85rem; color: #374151; margin: 0.7rem 0 0.25rem; }
input[type=text], input[type=email], input[type=password], input[type=file], select, textarea {
    width: 100%;
    padding: 0.5rem 0.6rem;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 0.95rem;
    font-family: inherit;
}
textarea { min-height: 140px; resize: vertical; }
.flash-success { background: #dcfce7; color: #166534; padding: 0.6rem 1rem; border-radius: 6px; margin-bottom: 1rem; }
.flash-error { background: #fee2e2; color: #991b1b; padding: 0.6rem 1rem; border-radius: 6px; margin-bottom: 1rem; }
.status-badge { padding: 0.15rem 0.5rem; border-radius: 4px; font-size: 0.78rem; }
.status-sent { background: #dcfce7; color: #166534; }
.status-failed { background: #fee2e2; color: #991b1b; }
.status-active { background: #dbeafe; color: #1e40af; }
.status-inactive { background: #e5e7eb; color: #4b5563; }
.hint { color: #6b7280; font-size: 0.8rem; margin-top: 0.2rem; }
.actions { display: flex; gap: 0.5rem; }