* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    font-family: system-ui, sans-serif;
}

/* ── Fondo Ken Burns ────────────────────────────── */
.bg-stage {
    position: fixed;
    inset: 0;
    z-index: 0;
}

.bg-slide {
    position: absolute;
    inset: -8%;          /* margen extra para el zoom */
    background-size: cover;
    background-position: center;
    opacity: 0;
    transition: opacity 1.8s ease-in-out;
    will-change: transform, opacity;
}

@keyframes kenburns-1 {
    0%   { transform: scale(1)    translate(0, 0); }
    100% { transform: scale(1.18) translate(-2%, -1%); }
}
@keyframes kenburns-2 {
    0%   { transform: scale(1)    translate(0, 0); }
    100% { transform: scale(1.18) translate(2%,  1%); }
}
@keyframes kenburns-3 {
    0%   { transform: scale(1)    translate(0, 0); }
    100% { transform: scale(1.18) translate(-1%,  2%); }
}
@keyframes kenburns-4 {
    0%   { transform: scale(1)    translate(0, 0); }
    100% { transform: scale(1.18) translate(1%, -2%); }
}

.bg-slide.active { opacity: 1; }
.bg-slide:nth-child(1).active { animation: kenburns-1 12s ease-in-out forwards; }
.bg-slide:nth-child(2).active { animation: kenburns-2 12s ease-in-out forwards; }
.bg-slide:nth-child(3).active { animation: kenburns-3 12s ease-in-out forwards; }
.bg-slide:nth-child(4).active { animation: kenburns-4 12s ease-in-out forwards; }

/* Overlay oscuro para legibilidad */
.bg-overlay {
    position: fixed;
    inset: 0;
    background: linear-gradient(135deg, rgba(10,15,40,.78) 0%, rgba(5,10,25,.65) 100%);
    z-index: 1;
}

/* ── Card de login ──────────────────────────────── */
.login-wrap {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 420px;
    padding: 1rem;
}

.login-card {
    background: rgba(255, 255, 255, 0.93);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255,255,255,.4);
    border-radius: 16px;
    box-shadow: 0 24px 60px rgba(0,0,0,.45);
    padding: 2.25rem 2rem;
}

.brand-icon {
    width: 56px; height: 56px;
    background: #1a2340;
    border-radius: 14px;
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 1rem;
}

.form-control:focus { border-color: #1a2340; box-shadow: 0 0 0 3px rgba(26,35,64,.15); }

.btn-login {
    background: #1a2340;
    border: none;
    color: #fff;
    font-weight: 600;
    letter-spacing: .02em;
    padding: .65rem;
    border-radius: 8px;
    transition: background .2s;
}
.btn-login:hover { background: #253060; color: #fff; }

footer-text {
    display: block;
    text-align: center;
    color: rgba(255,255,255,.5);
    font-size: .78rem;
    margin-top: 1.25rem;
}

/* ── Aviso de instalación PWA ───────────────────── */
.pwa-install-notice {
    display: none;
    align-items: center;
    gap: .5rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 1rem;
    padding: .5rem .75rem;
    background: rgba(255,255,255,.08);
    border: 1px solid rgba(255,255,255,.18);
    border-radius: 8px;
    color: rgba(255,255,255,.75);
    font-size: .78rem;
    text-align: center;
}

.pwa-install-notice.show { display: flex; }

.pwa-install-notice button {
    background: transparent;
    border: 1px solid rgba(255,255,255,.4);
    color: #fff;
    font-size: .75rem;
    font-weight: 600;
    padding: .15rem .6rem;
    border-radius: 6px;
    transition: background .2s;
}

.pwa-install-notice button:hover { background: rgba(255,255,255,.15); }