/* reset mínimo */
* {
    box-sizing: border-box;
}

html,
body {
    height: 100%;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    color: #111;
    background: #0f1216;
    display: grid;
    place-items: center;
}

/* fondo “barrera” a pantalla completa con franjas diagonales */
.backdrop {
    position: fixed;
    inset: 0;
    overflow: hidden;
}

.stripes {
    position: absolute;
    inset: -10vmax;
    transform: rotate(-12deg);
    background: repeating-linear-gradient(
        -45deg,
        #ffcc00 0,
        #ffcc00 28px,
        #0f1216 28px,
        #0f1216 56px
    );
    filter: saturate(110%) contrast(105%);
    opacity: .12; /* sutil para que no canse la vista */
}

/* brillo suave y viñeteado para dar profundidad */
.glow {
    position: absolute;
    inset: -20%;
    background: radial-gradient(60% 60% at 50% 30%, rgba(255,204,0,.15), transparent 60%),
                radial-gradient(80% 80% at 70% 80%, rgba(255,255,255,.05), transparent 60%);
    pointer-events: none;
}

.vignette {
    position: absolute;
    inset: 0;
    box-shadow: inset 0 0 120px rgba(0,0,0,.45);
    pointer-events: none;
}

/* tarjeta central */
.card {
    position: relative;
    width: min(92vw, 820px);
    padding: clamp(28px, 5vw, 48px);
    background: rgba(255,255,255,.06);
    border: 1px solid rgba(255,255,255,.12);
    border-radius: 24px;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    box-shadow: 0 10px 30px rgba(0,0,0,.35);
    text-align: center;
}

/* icono/ilustración barrera (SVG) */
.illustration {
    width: clamp(140px, 22vw, 220px);
    margin: 0 auto 22px;
    display: block;
}

/* tipografía */
h1 {
    margin: 0 0 10px;
    font-size: clamp(28px, 4.6vw, 44px);
    line-height: 1.1;
    color: #fff;
    letter-spacing: .2px;
}

h2 {
    margin: 0 0 10px;
    font-size: 36px;
    line-height: 1.1;
    color: #ffcc00;
    letter-spacing: .2px;
}

p {
    margin: 0;
    font-size: clamp(15px, 2.3vw, 18px);
    color: #d6d6d6;
}

/* franja avisos */
.ribbon {
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%) rotate(-1.5deg);
    padding: 6px 16px;
    background: repeating-linear-gradient(
        45deg,
        #ffcc00 0,
        #ffcc00 12px,
        #111 12px,
        #111 24px
    );
    color: #111;
    font-weight: 700;
    border-radius: 10px;
    border: 1px solid rgba(0,0,0,.25);
    box-shadow: 0 6px 16px rgba(0,0,0,.35);
    letter-spacing: .4px;
}

/* pie opcional (logo/enlace) */
.footer {
    margin-top: 22px;
    font-size: 14px;
    color: #9fa3a9;
    opacity: .9;
}

.footer a {
    color: #ffcc00;
    text-decoration: none;
    border-bottom: 1px dashed rgba(255,204,0,.6);
}

.footer a:hover {
    opacity: .85;
}

/* modo alto contraste si el sistema lo pide */
@media (prefers-contrast: more) {
    .stripes {
        opacity: .18;
    }

    .card {
        border-color: rgba(255,255,255,.25);
    }
}