:root {
    --bg: #f3f7fb;
    --panel: #ffffff;
    --panel-border: #dbe5f0;
    --text: #18324a;
    --muted: #5f7488;
    --accent: #4f8cff;
    --accent-strong: #2f6ce0;
    --accent-soft: #eaf1ff;
    --danger: #d94b4b;
    --shadow: 0 14px 36px rgba(19, 47, 87, 0.08);
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', Arial, sans-serif;
    background: linear-gradient(180deg, #eef4fb 0%, #f8fbff 100%);
    color: var(--text);
}

.layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 240px;
    background: linear-gradient(180deg, #ffffff 0%, #f5f8fc 100%);
    border-right: 1px solid var(--panel-border);
    padding: 24px 18px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    box-shadow: 6px 0 18px rgba(24, 50, 74, 0.04);
}

.sidebar a {
    color: var(--text);
    text-decoration: none;
    padding: 10px 12px;
    border-radius: 10px;
    transition: background 0.2s ease, color 0.2s ease;
}

.sidebar a:hover {
    background: var(--accent-soft);
    color: var(--accent-strong);
}

.brand {
    font-size: 26px;
    font-weight: 700;
    color: var(--accent-strong);
    margin-bottom: 18px;
}

.main {
    flex: 1;
    padding: 28px;
}

.topbar {
    margin-bottom: 20px;
    color: var(--muted);
    background: rgba(255, 255, 255, 0.86);
    border: 1px solid var(--panel-border);
    border-radius: 14px;
    padding: 14px 18px;
    box-shadow: var(--shadow);
}

.grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
}

.card {
    background: var(--panel);
    border: 1px solid var(--panel-border);
    border-radius: 16px;
    padding: 20px;
    box-shadow: var(--shadow);
}

.card h2,
.card h3 {
    margin-top: 0;
}

.card p {
    font-size: 32px;
    margin: 10px 0 0;
    color: var(--accent-strong);
}

.page-header {
    margin-bottom: 18px;
}

.page-header h2 {
    margin: 0;
    font-size: 28px;
}

.page-subtitle {
    margin: 8px 0 0;
    color: var(--muted);
}

.stat-card p {
    font-size: 32px;
    margin: 10px 0 0;
    color: var(--accent-strong);
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 16px;
    background: var(--panel);
    border-radius: 14px;
    overflow: hidden;
}

th,
td {
    border-bottom: 1px solid #edf2f7;
    padding: 12px 14px;
    text-align: left;
}

th {
    background: #f7faff;
    color: var(--muted);
    font-weight: 600;
}

tr:hover td {
    background: #fbfdff;
}

button,
input,
select,
textarea {
    border: 1px solid #c9d8e7;
    border-radius: 10px;
    padding: 9px 12px;
    font: inherit;
    box-sizing: border-box;
}

button {
    background: linear-gradient(180deg, #5c95ff 0%, #3f7ae6 100%);
    color: #ffffff;
    border: none;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

button:hover {
    transform: translateY(-1px);
    box-shadow: 0 10px 20px rgba(63, 122, 230, 0.18);
}

.inline-form {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
}

.toolbar {
    display: flex;
    gap: 14px;
    margin: 14px 0;
    flex-wrap: wrap;
}

.toolbar a,
.toolbar button {
    color: var(--accent-strong);
    background: var(--accent-soft);
    border: 1px solid #cfe0ff;
    text-decoration: none;
    padding: 9px 12px;
    border-radius: 10px;
}

.pager {
    margin-top: 14px;
    color: var(--muted);
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
}

.pager a {
    color: var(--accent-strong);
    text-decoration: none;
}

.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(180deg, #eef4fb 0%, #f8fbff 100%);
}

.login-panel {
    width: 380px;
    background: var(--panel);
    padding: 30px;
    border-radius: 20px;
    border: 1px solid var(--panel-border);
    box-shadow: var(--shadow);
}

.login-panel h1 {
    margin-top: 0;
    color: var(--text);
}

.login-hint {
    color: var(--muted);
    margin-top: -6px;
    margin-bottom: 18px;
}

.login-panel input,
.login-panel button {
    width: 100%;
    margin-top: 12px;
}

.login-panel input {
    background: #ffffff;
}

.error {
    color: var(--danger);
    margin-bottom: 10px;
}

.copy-box {
    width: 100%;
    min-height: 110px;
    margin: 10px 0;
    resize: vertical;
    background: #f9fbff;
    color: var(--text);
}

.status.unused {
    color: #27995b;
}

.status.bound {
    color: #2f6ce0;
}

.status.expired,
.status.revoked {
    color: var(--danger);
}