:root {
    --bg: #080808;
    --panel: rgba(31, 31, 31, 0.88);
    --panel-2: rgba(18, 18, 18, 0.92);
    --border: rgba(255, 255, 255, 0.11);
    --text: #f0f0f0;
    --muted: #b8b8b8;
    --accent: #d8d8d8;
    --danger: #ff6b6b;
    --shadow: rgba(0, 0, 0, 0.42);
    --sans: "Aptos", "Segoe UI", Arial, sans-serif;
    --mono: "Cascadia Code", Consolas, monospace;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    color: var(--text);
    font-family: var(--sans);
    background:
        linear-gradient(135deg, rgba(255, 255, 255, 0.04) 25%, transparent 25%) 0 0 / 18px 18px,
        linear-gradient(225deg, rgba(255, 255, 255, 0.035) 25%, transparent 25%) 0 0 / 18px 18px,
        linear-gradient(180deg, #151515 0%, #070707 100%);
}

.texture {
    position: fixed;
    inset: 0;
    pointer-events: none;
    opacity: 0.3;
    background-image:
        repeating-linear-gradient(0deg, rgba(255,255,255,0.035), rgba(255,255,255,0.035) 1px, transparent 1px, transparent 4px),
        radial-gradient(circle at 20% 10%, rgba(255,255,255,0.09), transparent 28%),
        radial-gradient(circle at 80% 20%, rgba(255,255,255,0.045), transparent 24%);
    mix-blend-mode: screen;
}

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

a:hover {
    text-decoration: underline;
}

button,
input,
textarea,
select {
    font: inherit;
}

button {
    min-height: 2.6rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    padding: 0.65rem 0.95rem;
    color: #050505;
    background: linear-gradient(180deg, #f3f3f3, #a9a9a9);
    cursor: pointer;
    font-weight: 700;
}

button.ghost,
.nav a {
    color: var(--text);
    background: rgba(255, 255, 255, 0.06);
}

button.danger {
    color: #220606;
    background: linear-gradient(180deg, #ff9b9b, var(--danger));
}

input,
textarea,
select {
    width: 100%;
    min-height: 2.55rem;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 8px;
    color: var(--text);
    background: rgba(0, 0, 0, 0.36);
    padding: 0.65rem 0.75rem;
}

input[type="range"] {
    padding: 0;
}

textarea {
    resize: vertical;
}

code {
    font-family: var(--mono);
}

.shell {
    position: relative;
    width: min(1480px, calc(100vw - 1.5rem));
    margin: 0 auto;
    padding: 1rem 0 1.5rem;
}

.topbar {
    display: grid;
    gap: 1rem;
    align-items: end;
    padding: 1rem 0;
}

.topbar h1,
.login-panel h1 {
    margin: 0.1rem 0 0.35rem;
    font-size: clamp(2rem, 6vw, 4.8rem);
    line-height: 0.95;
    letter-spacing: 0;
}

.eyebrow {
    margin: 0;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.14em;
    font-size: 0.75rem;
}

.muted,
small {
    color: var(--muted);
}

.nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
}

.nav a,
.nav button {
    display: inline-flex;
    align-items: center;
    min-height: 2.35rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.45rem 0.75rem;
}

.nav a.active {
    background: rgba(255, 255, 255, 0.17);
}

.layout {
    display: grid;
    gap: 1rem;
}

.demo-grid {
    --columns: 3;
    --gap: 14px;
    --texture-strength: 0.55;
    display: grid;
    grid-template-columns: repeat(var(--columns), minmax(0, 1fr));
    gap: var(--gap);
    align-content: start;
    min-height: 55vh;
    padding: max(0.75rem, var(--gap));
    border: 1px solid var(--border);
    border-radius: 8px;
    background:
        linear-gradient(45deg, rgba(255,255,255,calc(0.08 * var(--texture-strength))) 25%, transparent 25%) 0 0 / 12px 12px,
        linear-gradient(135deg, #242424, #101010);
    box-shadow: 0 24px 70px var(--shadow);
}

.demo-card {
    grid-column: span min(var(--span), var(--columns));
    min-width: 0;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 8px;
    background: var(--panel-2);
}

.demo-card img,
.demo-card video {
    display: block;
    width: 100%;
    height: 320px;
    background: #050505;
}

.demo-card.h-short img,
.demo-card.h-short video {
    height: 220px;
}

.demo-card.h-medium img,
.demo-card.h-medium video {
    height: 420px;
}

.demo-card.h-tall img,
.demo-card.h-tall video {
    height: 620px;
}

.text-block {
    min-height: 180px;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
    padding: 1.1rem;
    font-size: 1.05rem;
    line-height: 1.48;
    background:
        linear-gradient(90deg, rgba(255,255,255,0.06) 1px, transparent 1px) 0 0 / 18px 18px,
        #111;
}

.card-body {
    display: grid;
    gap: 0.35rem;
    padding: 0.85rem;
}

.card-body h2 {
    margin: 0;
    font-size: 1rem;
}

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

.side {
    display: grid;
    gap: 1rem;
    align-content: start;
}

.panel,
.login-panel .panel {
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
    background: var(--panel);
    box-shadow: 0 18px 45px var(--shadow);
}

.panel-heading {
    margin-bottom: 0.85rem;
}

.panel-heading h2 {
    margin: 0.1rem 0 0;
    font-size: 1.15rem;
}

.stack,
.controls,
.mini-form {
    display: grid;
    gap: 0.75rem;
}

label {
    display: grid;
    gap: 0.35rem;
    color: var(--muted);
}

.form-row {
    display: grid;
    gap: 0.7rem;
}

.admin-details {
    border-top: 1px solid var(--border);
    padding: 0.75rem;
}

.admin-details summary {
    cursor: pointer;
    color: var(--accent);
    margin-bottom: 0.75rem;
}

.empty-state {
    grid-column: 1 / -1;
    display: grid;
    place-items: center;
    min-height: 40vh;
    text-align: center;
    color: var(--muted);
}

.empty-state h2 {
    color: var(--text);
    margin: 0;
}

.login-panel {
    display: grid;
    place-items: center;
    min-height: 82vh;
}

.narrow {
    width: min(460px, 100%);
}

.alert {
    padding: 0.75rem;
    border: 1px solid rgba(255, 107, 107, 0.45);
    border-radius: 8px;
    color: #ffd5d5;
    background: rgba(255, 107, 107, 0.12);
}

.footer {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 0.75rem;
    padding-top: 1rem;
    color: var(--muted);
    font-size: 0.85rem;
}

@media (min-width: 760px) {
    .topbar {
        grid-template-columns: minmax(0, 1fr) auto;
    }

    .form-row.thirds {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

@media (min-width: 1120px) {
    .layout {
        grid-template-columns: minmax(0, 1fr) 360px;
        align-items: start;
    }
}

@media (max-width: 760px) {
    .demo-grid {
        grid-template-columns: 1fr;
    }

    .demo-card {
        grid-column: span 1;
    }

    .demo-card img,
    .demo-card video,
    .demo-card.h-short img,
    .demo-card.h-short video,
    .demo-card.h-medium img,
    .demo-card.h-medium video,
    .demo-card.h-tall img,
    .demo-card.h-tall video {
        height: auto;
        max-height: 70vh;
    }
}