:root {
    --bg: #f4f6f8;
    --surface: #ffffff;
    --text: #1f2933;
    --muted: #6b7280;
    --line: #d8dee6;
    --primary: #0f766e;
    --primary-dark: #0b5f59;
    --accent: #b45309;
    --danger: #b91c1c;
    --shadow: 0 8px 24px rgba(31, 41, 51, 0.08);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif;
    font-size: 16px;
    line-height: 1.6;
}

a {
    color: inherit;
    text-decoration: none;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    background: var(--surface);
    border-bottom: 1px solid var(--line);
}

.header-inner {
    max-width: 1180px;
    margin: 0 auto;
    padding: 14px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.brand {
    font-weight: 700;
    color: var(--primary);
    white-space: nowrap;
}

.nav {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: flex-end;
}

.nav a {
    min-height: 36px;
    padding: 7px 12px;
    border-radius: 8px;
    color: var(--muted);
}

.nav a.active,
.nav a:hover {
    background: #e6f4f1;
    color: var(--primary);
}

.container {
    max-width: 1180px;
    margin: 0 auto;
    padding: 24px 20px 48px;
}

.page-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 18px;
}

h1,
h2,
h3 {
    margin: 0;
    line-height: 1.3;
}

h1 {
    font-size: 28px;
}

h2 {
    font-size: 20px;
}

h3 {
    font-size: 17px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
}

.grid.three {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: var(--shadow);
    padding: 18px;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 12px;
}

.muted {
    color: var(--muted);
}

.stat {
    font-size: 34px;
    font-weight: 700;
    color: var(--primary);
}

.list {
    display: grid;
    gap: 10px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.list-item {
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 12px;
    background: #fbfcfd;
}

.item-title {
    font-weight: 700;
}

.item-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 6px;
    color: var(--muted);
    font-size: 14px;
}

.badge {
    display: inline-flex;
    align-items: center;
    min-height: 28px;
    padding: 3px 9px;
    border-radius: 999px;
    background: #eef2f7;
    color: #334155;
    font-size: 14px;
}

.badge.high {
    background: #fee2e2;
    color: #991b1b;
}

.badge.medium {
    background: #fef3c7;
    color: #92400e;
}

.badge.low {
    background: #dcfce7;
    color: #166534;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}

.form-full {
    grid-column: 1 / -1;
}

label {
    display: grid;
    gap: 6px;
    font-weight: 600;
}

input,
select,
textarea {
    width: 100%;
    min-height: 44px;
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 10px 12px;
    font: inherit;
    background: #fff;
    color: var(--text);
}

textarea {
    min-height: 150px;
    resize: vertical;
}

.textarea-large {
    min-height: 210px;
}

.actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 14px;
}

.button,
button {
    min-height: 44px;
    border: 0;
    border-radius: 8px;
    padding: 10px 16px;
    background: var(--primary);
    color: #fff;
    font: inherit;
    font-weight: 700;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.button:hover,
button:hover {
    background: var(--primary-dark);
}

.button.secondary,
button.secondary {
    background: #e5e7eb;
    color: var(--text);
}

.button.danger,
button.danger {
    background: var(--danger);
}

.search-row {
    display: flex;
    gap: 10px;
    margin-bottom: 16px;
}

.table-wrap {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th,
td {
    border-bottom: 1px solid var(--line);
    padding: 12px 10px;
    text-align: left;
    vertical-align: top;
}

th {
    color: var(--muted);
    font-size: 14px;
    font-weight: 700;
}

.inline-form {
    display: inline;
}

.copy-box {
    width: 100%;
    min-height: 320px;
    white-space: pre-wrap;
}

.empty {
    padding: 18px;
    color: var(--muted);
    text-align: center;
    border: 1px dashed var(--line);
    border-radius: 8px;
}

.login-page {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
}

.login-card {
    width: min(100%, 420px);
}

.login-card h1 {
    margin-bottom: 6px;
}

.alert {
    margin: 14px 0;
    padding: 10px 12px;
    border: 1px solid #fecaca;
    border-radius: 8px;
    background: #fef2f2;
    color: #991b1b;
}

@media (max-width: 768px) {
    .header-inner {
        align-items: flex-start;
        flex-direction: column;
        padding: 12px 14px;
    }

    .nav {
        width: 100%;
        justify-content: flex-start;
    }

    .nav a {
        flex: 1 1 auto;
        text-align: center;
    }

    .container {
        padding: 18px 14px 36px;
    }

    h1 {
        font-size: 24px;
    }

    .grid,
    .grid.three,
    .form-grid {
        grid-template-columns: 1fr;
    }

    .page-title {
        align-items: flex-start;
        flex-direction: column;
    }

    .search-row {
        flex-direction: column;
    }

    table,
    thead,
    tbody,
    th,
    td,
    tr {
        display: block;
    }

    thead {
        display: none;
    }

    tr {
        border: 1px solid var(--line);
        border-radius: 8px;
        margin-bottom: 12px;
        padding: 10px;
        background: #fff;
    }

    td {
        border-bottom: 0;
        padding: 6px 0;
    }

    td::before {
        content: attr(data-label);
        display: block;
        color: var(--muted);
        font-size: 13px;
        font-weight: 700;
    }
}