:root,
:root[data-theme="dark"] {
    --bg: #12161c;
    --surface: #1a2029;
    --surface-raised: #212836;
    --border: #2a323d;
    --text: #e7ebf1;
    --text-muted: #8891a0;
    --accent: #f5a623;
    --accent-strong: #ffbb47;
    --accent-ink: #1a1305;
    --status-good: #3ddc84;
    --status-bad: #e5484d;
    color-scheme: dark;
}

:root[data-theme="light"] {
    --bg: #eef1f6;
    --surface: #ffffff;
    --surface-raised: #f7f9fc;
    --border: #d7dce3;
    --text: #12161c;
    --text-muted: #5b6472;
    --accent: #b9750f;
    --accent-strong: #8f5c0c;
    --accent-ink: #fff8ec;
    --status-good: #1e9a5a;
    --status-bad: #c53328;
    color-scheme: light;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    font-size: 15px;
    line-height: 1.6;
    min-height: 100vh;
}

body,
.pulse-line,
.theme-toggle,
.field__input,
.btn,
.module-card {
    transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.mono {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

.eyebrow {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
    font-size: 11px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
}

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

.small {
    font-size: 13px;
}

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

a:hover {
    text-decoration: underline;
}

h1 {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
    font-size: 26px;
    font-weight: 600;
    letter-spacing: -0.01em;
}

h2 {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
    font-size: 18px;
    font-weight: 600;
}

/* signature element: one-time handshake pulse on load */
.pulse-line {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    z-index: 40;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    background-size: 200% 100%;
    animation: pulse-sweep 1.4s ease-out 1;
}

@keyframes pulse-sweep {
    from { background-position: 160% 0; }
    to { background-position: -60% 0; }
}

/* theme toggle */
.theme-toggle {
    position: fixed;
    top: 16px;
    right: 16px;
    z-index: 50;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text-muted);
    cursor: pointer;
}

.theme-toggle:hover {
    color: var(--accent);
    border-color: var(--accent);
}

.theme-toggle:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
:root[data-theme="light"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: none; }

/* focus ring, used everywhere */
a:focus-visible,
button:focus-visible,
input:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* buttons */
.btn {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
    font-size: 14px;
    font-weight: 600;
    padding: 10px 18px;
    border-radius: 8px;
    border: 1px solid transparent;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn--primary {
    background: var(--accent);
    color: var(--accent-ink);
}

.btn--primary:hover {
    background: var(--accent-strong);
}

.btn--full {
    width: 100%;
    justify-content: center;
}

/* form fields */
.field {
    margin-bottom: 18px;
}

.field__label {
    display: block;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
    font-size: 11px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.field__input {
    width: 100%;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
    font-size: 14px;
    padding: 10px 12px;
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 8px;
}

.field__input:focus {
    outline: 2px solid var(--accent);
    outline-offset: 1px;
    border-color: var(--accent);
}

.field__input--error {
    border-color: var(--status-bad);
}

.field__error {
    margin-top: 6px;
    font-size: 13px;
    color: var(--status-bad);
}

/* auth split-panel shell */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 32px 16px;
}

.auth-shell {
    display: grid;
    grid-template-columns: 1fr 1fr;
    max-width: 880px;
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
}

.auth-hero {
    background: var(--surface-raised);
    padding: 40px 32px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 32px;
    border-right: 1px solid var(--border);
}

.auth-hero__brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--accent);
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
    font-size: 18px;
    font-weight: 600;
}

.auth-hero__diagram {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
    font-size: 13px;
    color: var(--text);
}

.auth-hero__diagram .connector {
    color: var(--accent);
    flex: 1;
}

.auth-hero__diagram span.mono {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 4px 8px;
    border-radius: 6px;
    white-space: nowrap;
}

.auth-hero__tagline {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.5;
}

.auth-form {
    background: var(--surface);
    padding: 40px 32px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.auth-form h1 {
    margin-bottom: 4px;
}

.auth-form__intro {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 24px;
}

.auth-switch {
    margin-top: 16px;
    font-size: 13px;
    color: var(--text-muted);
}

/* management top bar */
.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 24px;
    background: var(--surface-raised);
    border-bottom: 1px solid var(--border);
    flex-wrap: wrap;
}

.nav__brand {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--accent);
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
    font-weight: 600;
    font-size: 16px;
}

.nav__links {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav__link {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
    font-size: 12px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--text-muted);
    padding-bottom: 2px;
    border-bottom: 2px solid transparent;
}

.nav__link:hover {
    color: var(--text);
    text-decoration: none;
}

.nav__link--active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

.nav__actions {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-left: auto;
}

.nav__status {
    display: flex;
    align-items: center;
    gap: 8px;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}

.status-dot--good {
    background: var(--status-good);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--status-good) 25%, transparent);
}

.status-dot--bad {
    background: var(--status-bad);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--status-bad) 25%, transparent);
}

/* content area */
.content {
    max-width: 960px;
    margin: 0 auto;
    padding: 40px 24px;
}

.content__header {
    margin-bottom: 28px;
}

.content__header h1 {
    margin-top: 4px;
}

/* dashboard module grid */
.module-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
}

.module-card {
    display: block;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
}

.module-card:hover {
    border-color: var(--accent);
    background: var(--surface-raised);
    text-decoration: none;
}

.module-card__title {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
    font-size: 15px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 6px;
}

.module-card__desc {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.5;
}

.module-card__meta {
    margin-top: 12px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
    font-size: 12px;
    color: var(--accent);
}

/* data table */
.table-wrap {
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: 12px;
}

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

thead th {
    text-align: left;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
    font-size: 11px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    background: var(--surface-raised);
}

tbody td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
    font-size: 13px;
}

tbody tr:last-child td {
    border-bottom: none;
}

tbody tr:hover {
    background: var(--surface-raised);
}

@media (max-width: 720px) {
    .auth-shell {
        grid-template-columns: 1fr;
    }

    .auth-hero {
        border-right: none;
        border-bottom: 1px solid var(--border);
        padding: 24px;
    }

    .auth-hero__diagram {
        display: none;
    }

    .auth-form {
        padding: 24px;
    }

    .nav {
        gap: 12px;
    }

    .nav__actions {
        margin-left: 0;
    }
}

@media (prefers-reduced-motion: reduce) {
    .pulse-line {
        animation: none;
        background: var(--accent);
        opacity: 0.6;
    }

    body,
    .pulse-line,
    .theme-toggle,
    .field__input,
    .btn,
    .module-card {
        transition: none;
    }
}