:root {
    --bg-color: #faf9f6;
    --text-color: #1b1c1a;
    --grid-color: rgba(144, 111, 104, 0.05);
}

.dark {
    --bg-color: #0c0c0c;
    --text-color: #e8e8e0;
    --grid-color: rgba(255, 255, 255, 0.035);
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    background-image: 
        linear-gradient(to right, var(--grid-color) 1px, transparent 1px),
        linear-gradient(to bottom, var(--grid-color) 1px, transparent 1px);
    background-size: 40px 40px;
    transition: background-color 0.35s ease, color 0.35s ease;
}

.dark .bg-background { background-color: var(--bg-color); }
.dark .text-on-background { color: var(--text-color); }
.dark .bg-surface-container-lowest { background-color: #000000; }
.dark .bg-surface-container { background-color: #141414; }
.dark .text-secondary { color: #8a8a82; }
.dark .border-outline\/10 { border-color: rgba(255,255,255,0.09); }
.dark .border-outline\/20 { border-color: rgba(255,255,255,0.15); }
.dark .border-outline\/30 { border-color: rgba(255,255,255,0.25); }
.dark .text-outline { color: rgba(255,255,255,0.6); }

.material-symbols-outlined {
    font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
    vertical-align: middle;
}

.hal-pulse {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: .7; transform: scale(0.95); }
}

.monolith-divider {
    height: 1px;
    background: linear-gradient(90deg, rgba(204, 34, 0, 1) 0%, rgba(144, 111, 104, 0.1) 100%);
}

.mission-panel {
    border-left: 1px solid rgba(204, 34, 0, 0.2);
    padding-left: 24px;
}

/* i18n logic */
html[data-lang="es"] [lang="en"] { display: none !important; }
html[data-lang="en"] [lang="es"] { display: none !important; }

/* Smooth language transition (cinematic fade) */
main { transition: opacity 0.4s ease; }
main.lang-switching { opacity: 0; }

/* Streamline effect */
.streamline-reveal {
    clip-path: inset(0 100% 0 0);
    display: inline-block;
}
.streamline-animate {
    animation: reveal-stream 1.5s cubic-bezier(0.2, 1, 0.3, 1) forwards;
}
@keyframes reveal-stream {
    to { clip-path: inset(0 0 0 0); }
}

/* Streaming (typewriter) effect */
.streaming-text { min-height: 1em; }
.stream-cursor {
    display: inline-block;
    width: 0.6ch;
    color: #cc2200;
    font-weight: 400;
    animation: stream-blink 0.9s steps(1) infinite;
}
@keyframes stream-blink {
    0%, 50% { opacity: 1; }
    50.01%, 100% { opacity: 0; }
}

/* Active nav indicator */
.nav-link {
    border-bottom: 2px solid transparent;
}
.nav-link.active {
    border-bottom-color: #cc2200;
    color: #cc2200;
}

/* ============================================================
   ACCESIBILIDAD (a11y)
   ============================================================ */

/* Indicador de foco visible para navegación por teclado.
   Solo se muestra con :focus-visible (teclado), no al hacer click. */
:focus-visible {
    outline: 2px solid #cc2200;
    outline-offset: 2px;
    border-radius: 2px;
}
.dark :focus-visible {
    outline-color: #ff7a5c;
}

/* Reducción de movimiento: desactiva animaciones repetitivas para usuarios
   que activaron "prefers-reduced-motion" en su sistema operativo. */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    .hal-pulse,
    .stream-cursor {
        animation: none !important;
    }
    /* El cursor de tipeo permanece visible (sin parpadeo). */
    .stream-cursor {
        opacity: 1;
    }
    /* Transición de cambio de idioma instantánea. */
    main {
        transition: none !important;
    }
}