:root {
    color-scheme: dark;
    --bg: #101418;
    --panel: #171d23;
    --panel-2: #202832;
    --text: #edf2f7;
    --muted: #9ba8b5;
    --line: #303a45;
    --accent: #5cc8ff;
}

html[data-theme="light"] {
    color-scheme: light;
    --bg: #f6f8fb;
    --panel: #ffffff;
    --panel-2: #eef2f6;
    --text: #17202a;
    --muted: #657282;
    --line: #d7dee8;
    --accent: #0b6bcb;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a { color: inherit; }

.frontend {
    min-height: 100vh;
    background:
        radial-gradient(circle at 20% 20%, rgba(92, 200, 255, 0.16), transparent 32%),
        linear-gradient(135deg, #0d141c, #16202a 48%, #0f2831);
    overflow: hidden;
}

.frontend-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 24px clamp(20px, 5vw, 72px);
}

.login-link,
button {
    border: 0;
    border-radius: 6px;
    background: var(--accent);
    color: #071018;
    cursor: pointer;
    font-weight: 700;
    padding: 10px 14px;
    text-decoration: none;
}

.frontend-hero {
    max-width: 880px;
    padding: 14vh clamp(20px, 5vw, 72px);
}

.frontend-hero h1 {
    font-size: clamp(40px, 8vw, 86px);
    margin: 8px 0 18px;
}

.frontend-hero p {
    color: var(--muted);
    font-size: clamp(18px, 2.2vw, 24px);
    line-height: 1.5;
    margin: 0 0 18px;
}

.backend-shell {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 260px 1fr;
}

.backend-sidebar {
    background: var(--panel);
    border-right: 1px solid var(--line);
    padding: 18px;
}

.backend-brand {
    font-weight: 800;
    margin-bottom: 24px;
}

.backend-sidebar nav {
    display: grid;
    gap: 6px;
}

.backend-sidebar a,
.nav-logout {
    display: block;
    border-radius: 6px;
    padding: 10px 12px;
    background: transparent;
    color: var(--text);
    text-align: left;
    text-decoration: none;
}

.backend-sidebar a:hover,
.nav-logout:hover {
    background: var(--panel-2);
}

.backend-main {
    min-width: 0;
}

.backend-topbar {
    display: flex;
    align-items: center;
    gap: 12px;
    height: 58px;
    border-bottom: 1px solid var(--line);
    padding: 0 20px;
    background: var(--panel);
}

.backend-content {
    padding: 24px;
}

.backend-nav-toggle {
    display: none;
}

.burger {
    display: none;
    cursor: pointer;
    font-size: 24px;
}

.page-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 20px;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--panel);
    border: 1px solid var(--line);
}

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

.editor-panel {
    display: grid;
    gap: 14px;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 18px;
    margin-bottom: 20px;
}

label {
    display: grid;
    gap: 6px;
}

fieldset {
    border: 1px solid var(--line);
    border-radius: 6px;
    display: grid;
    gap: 8px;
    margin: 0;
    padding: 12px;
}

.check-row {
    align-items: center;
    display: flex;
    flex-direction: row;
    gap: 8px;
}

input {
    border: 1px solid var(--line);
    border-radius: 6px;
    background: var(--bg);
    color: var(--text);
    padding: 10px;
}

.login-page {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: clamp(20px, 5vw, 72px);
    background:
        radial-gradient(circle at 78% 18%, rgba(92, 200, 255, 0.14), transparent 30%),
        linear-gradient(135deg, #0d141c, #151f29 52%, #0f2831);
}

.login-shell {
    width: min(920px, 100%);
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(320px, 420px);
    gap: clamp(24px, 6vw, 72px);
    align-items: center;
}

.login-brand {
    display: grid;
    gap: 12px;
}

.login-brand a {
    font-size: clamp(42px, 7vw, 76px);
    font-weight: 850;
    line-height: 0.95;
    text-decoration: none;
}

.login-brand p,
.login-kicker {
    color: var(--muted);
    font-size: 16px;
    margin: 0;
}

.login-panel {
    display: grid;
    gap: 18px;
    background: color-mix(in srgb, var(--panel) 88%, transparent);
    border: 1px solid color-mix(in srgb, var(--line) 82%, var(--accent));
    border-radius: 8px;
    box-shadow: 0 22px 70px rgba(0, 0, 0, 0.26);
    padding: clamp(22px, 4vw, 34px);
}

.login-panel h1 {
    margin: 4px 0 0;
}

.login-panel button {
    margin-top: 4px;
    width: 100%;
}

.login-panel input {
    min-height: 24px;
}

.form-error {
    color: #ff8a8a;
    margin: 0;
}

@media (max-width: 820px) {
    .login-shell {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .login-brand a {
        font-size: clamp(38px, 14vw, 62px);
    }

    .backend-shell {
        grid-template-columns: 1fr;
    }

    .burger {
        display: inline-block;
    }

    .backend-sidebar {
        position: fixed;
        inset: 0 auto 0 0;
        width: 260px;
        z-index: 10;
        transform: translateX(-100%);
        transition: transform .2s ease;
    }

    .backend-nav-toggle:checked ~ .backend-sidebar {
        transform: translateX(0);
    }
}