:root {
    --bg: #06070a;
    --ink: #f5f7fb;
    --muted: #9aa4b5;
    --line: rgba(255, 255, 255, 0.12);
    --glass: rgba(255, 255, 255, 0.055);
    --glass-strong: rgba(255, 255, 255, 0.09);
    --blue: #3b82f6;
    --blue-soft: #60a5fa;
    --red: #ef4444;
    --green: #22c55e;
}

*, *::before, *::after {
    box-sizing: border-box;
    border-radius: 0 !important;
}

html {
    scroll-padding-top: 88px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    min-height: 100vh;
    background:
        radial-gradient(900px 600px at 78% -6%, rgba(59, 130, 246, 0.22), transparent 70%),
        radial-gradient(800px 700px at 4% 38%, rgba(96, 165, 250, 0.09), transparent 70%),
        var(--bg);
    background-attachment: fixed;
    color: var(--ink);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
}

p {
    margin: 0;
    color: var(--muted);
}

h1, h2 {
    margin: 0;
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.1;
}

img {
    display: block;
}

.bar {
    position: sticky;
    top: 0;
    z-index: 20;
    display: flex;
    align-items: center;
    gap: 28px;
    padding: 14px 28px;
    border-bottom: 1px solid var(--line);
    background: rgba(6, 7, 10, 0.72);
    -webkit-backdrop-filter: blur(18px);
    backdrop-filter: blur(18px);
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    text-decoration: none;
}

.bar nav {
    display: flex;
    gap: 22px;
    margin-right: auto;
}

.bar nav a {
    color: var(--muted);
    text-decoration: none;
    font-size: 0.95rem;
}

.bar nav a:hover {
    color: var(--ink);
}

.signout {
    display: flex;
    align-items: center;
    gap: 14px;
    margin: 0;
}

.signout span {
    color: var(--muted);
    font-size: 0.92rem;
}

.wrap {
    max-width: 1180px;
    margin: 0 auto;
    padding: 56px 28px 40px 28px;
}

h1 {
    font-size: clamp(2.2rem, 5vw, 3.4rem);
}

.lead {
    max-width: 640px;
    margin-top: 14px;
    font-size: 1.05rem;
}

.island {
    border: 1px solid var(--line);
    background: var(--glass);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
}

.flash {
    margin-top: 28px;
    padding: 14px 20px;
    border: 1px solid var(--line);
    border-left-width: 4px;
    background: var(--glass-strong);
}

.flash.ok {
    border-left-color: var(--green);
}

.flash.bad {
    border-left-color: var(--red);
}

.demo {
    margin-top: 28px;
    padding: 28px;
}

.demo h2 {
    margin-bottom: 8px;
    font-size: 1.5rem;
}

.signin {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin: 20px 0 14px 0;
}

.signin input {
    flex: 1 1 200px;
}

.small {
    font-size: 0.85rem;
}

.small a {
    text-decoration: underline;
    text-underline-offset: 3px;
}

.layout {
    display: grid;
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 28px;
    margin-top: 36px;
    align-items: start;
}

.side {
    position: sticky;
    top: 88px;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--line);
    background: var(--glass);
}

.side a {
    padding: 12px 18px;
    border-bottom: 1px solid var(--line);
    color: var(--muted);
    text-decoration: none;
}

.side a:last-child {
    border-bottom: 0;
}

.side a:hover {
    background: var(--glass-strong);
    color: var(--ink);
}

.content {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.block {
    padding: 30px;
}

.block h2 {
    margin-bottom: 8px;
    font-size: 1.6rem;
}

.items {
    margin: 18px 0 6px 0;
    padding: 0;
    list-style: none;
    border: 1px solid var(--line);
}

.items li {
    padding: 10px 16px;
    border-top: 1px solid var(--line);
    color: var(--ink);
    font-size: 0.95rem;
    overflow-wrap: anywhere;
}

.items li:first-child {
    border-top: 0;
}

.action {
    margin-top: 12px;
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.025);
}

.action summary {
    padding: 14px 18px;
    cursor: pointer;
    font-weight: 600;
    list-style: none;
}

.action summary::-webkit-details-marker {
    display: none;
}

.action summary::after {
    content: '+';
    float: right;
    color: var(--blue-soft);
}

.action[open] summary::after {
    content: '-';
}

.action[open] summary {
    border-bottom: 1px solid var(--line);
}

.action form {
    padding: 20px 18px 22px 18px;
}

fieldset {
    min-width: 0;
    margin: 0;
    padding: 0;
    border: 0;
}

fieldset:disabled {
    opacity: 0.5;
}

label {
    display: block;
    margin-bottom: 16px;
}

label span {
    display: block;
    margin-bottom: 6px;
    color: var(--muted);
    font-size: 0.88rem;
}

label small {
    display: block;
    margin-top: 6px;
    color: #7d8799;
    font-size: 0.82rem;
}

input, select, textarea {
    width: 100%;
    padding: 11px 14px;
    border: 1px solid var(--line);
    background: rgba(0, 0, 0, 0.35);
    color: var(--ink);
    font: inherit;
    font-size: 0.95rem;
}

input:focus, select:focus, textarea:focus {
    outline: 2px solid var(--blue);
    outline-offset: -1px;
}

select option {
    background: #0b0e14;
}

.button {
    display: inline-block;
    padding: 11px 22px;
    border: 1px solid var(--line);
    background: var(--glass-strong);
    color: var(--ink);
    font: inherit;
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    cursor: pointer;
}

.button:hover {
    border-color: rgba(255, 255, 255, 0.3);
}

.button.solid {
    border-color: var(--blue);
    background: var(--blue);
}

.button.danger {
    border-color: var(--red);
    background: rgba(239, 68, 68, 0.18);
}

.button.small {
    padding: 7px 14px;
    font-size: 0.85rem;
}

.demo-line {
    padding: 28px 28px 0 28px;
    text-align: center;
    font-size: 0.8rem;
}

@media (max-width: 860px) {
    .layout {
        grid-template-columns: 1fr;
    }

    .side {
        position: static;
        flex-direction: row;
        overflow-x: auto;
    }

    .side a {
        flex: 0 0 auto;
        border-bottom: 0;
        border-right: 1px solid var(--line);
    }

    .bar {
        flex-wrap: wrap;
        gap: 14px;
        padding: 12px 18px;
    }

    .wrap {
        padding: 36px 18px 28px 18px;
    }

    .block {
        padding: 22px 18px;
    }
}