:root {
    --color-primary: #1d4e5f;
    --color-primary-hover: #163d49;
    --color-accent: #2f8f78;
    --color-bg: #ffffff;
    --color-surface: #f5f7f7;
    --color-text: #202124;
    --color-text-muted: #5f6368;
    --color-border: #e0e3e2;
    --color-danger: #b3261e;
    --radius-sm: 4px;
    --radius-md: 8px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.55;
}

a {
    color: var(--color-primary);
}

.site-header {
    border-bottom: 1px solid var(--color-border);
    background: var(--color-surface);
}

.site-header-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 1rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.site-brand {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-text);
    text-decoration: none;
}

.site-brand:hover {
    color: var(--color-primary);
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.site-nav a:not(.button) {
    font-weight: 600;
    font-size: 0.9rem;
    text-decoration: none;
    color: var(--color-text);
}

.site-main {
    max-width: 1100px;
    margin: 0 auto;
    padding: 2.5rem 1.25rem 4rem;
}

.site-main--narrow {
    max-width: 480px;
}

h1 {
    font-size: 2rem;
    line-height: 1.15;
    margin: 0 0 1rem;
}

h2 {
    font-size: 1.25rem;
    margin: 0 0 0.5rem;
}

p {
    color: var(--color-text);
}

.feature-grid {
    display: flex;
    flex-wrap: wrap;
    margin: 2rem -0.75rem;
}

.feature-grid > div {
    box-sizing: border-box;
    padding: 0 0.75rem;
    flex: 1 1 220px;
}

.feature-grid p {
    color: var(--color-text-muted);
}

.button,
button[type="submit"],
input[type="submit"] {
    display: inline-block;
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 600;
    color: #fff;
    background: var(--color-primary);
    border: none;
    border-radius: var(--radius-sm);
    padding: 0.65em 1.3em;
    text-decoration: none;
    cursor: pointer;
}

.button:hover,
button[type="submit"]:hover {
    background: var(--color-primary-hover);
    color: #fff;
}

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    max-width: 480px;
}

form p {
    margin: 0 0 1em;
}

label {
    display: block;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 0.3em;
}

input[type="text"],
input[type="email"],
input[type="password"] {
    width: 100%;
    font-family: inherit;
    font-size: 1rem;
    padding: 0.55em 0.7em;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
}

small {
    display: block;
    color: var(--color-text-muted);
    font-size: 0.8rem;
    margin-top: 0.3em;
}

.form-error {
    color: var(--color-danger);
    background: #fceceb;
    border: 1px solid #f2c6c2;
    padding: 0.75em 1em;
    border-radius: var(--radius-sm);
    margin: 0 0 1em;
}

.form-error ul {
    margin: 0;
    padding-left: 1.2em;
}

.account-meta {
    list-style: none;
    margin: 0 0 1.5rem;
    padding: 0;
}

.account-meta li {
    padding: 0.5em 0;
    border-bottom: 1px dashed var(--color-border);
}

.account-meta span {
    color: var(--color-text-muted);
    display: inline-block;
    min-width: 9em;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
}

.data-table th,
.data-table td {
    text-align: left;
    padding: 0.6em 0.9em;
    border-bottom: 1px solid var(--color-border);
}

.data-table th {
    color: var(--color-text-muted);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
}

.status-online {
    color: var(--color-accent);
    font-weight: 600;
}

.status-offline {
    color: var(--color-danger);
    font-weight: 600;
}