/* ==========================================================================
   NEXO — DESIGN SYSTEM FOUNDATION v2
   Tokens centralizados · Light/Dark diseñados (no invertidos) · Motion system
   ========================================================================== */

:root {
    /* ============ COLOR — LIGHT MODE (diseño propio NEXO) ============ */
    /* Identidad: cálido-arquitectónico. Fondos de papel cálido, tinta profunda
       con matiz azul-noche, acento terracota-tecnológico. Nada genérico. */
    --color-bg: #faf9f7;               /* papel cálido, no gris frío */
    --color-surface: #ffffff;          /* tarjeta elevada */
    --color-surface-elevated: #ffffff;
    --color-surface-sunken: #f2f0ec;   /* inputs, zonas empotradas */
    --color-overlay: rgba(255, 255, 255, 0.82);

    --color-ink: #14181f;              /* tinta principal (azul-noche) */
    --color-ink-secondary: #4a525e;    /* texto secundario */
    --color-ink-muted: #646c78;        /* metadatos, captions — 5.04:1 sobre bg (WCAG AA) */
    --color-ink-on-accent: #ffffff;

    --color-border: rgba(20, 24, 31, 0.09);
    --color-border-strong: rgba(20, 24, 31, 0.16);

    /* Acento de marca: derivable de BRAND_PRIMARY_COLOR vía {{BRAND_PRIMARY_COLOR}}
       en los <style> de cada página (white-label). */
    --color-accent: #c2410c;           /* terracota NEXO — acción principal */
    --color-accent-hover: #a83709;
    --color-accent-subtle: rgba(194, 65, 12, 0.08);

    --color-scrim: rgba(12, 14, 17, 0.48);  /* overlay de sheets/modales */

    --color-link: #1e4fd6;             /* azul de enlace, sobrio */
    --color-success: #15803d;
    --color-warning: #b45309;
    --color-error: #b91c1c;
    --color-info: #0369a1;

    --color-badge: rgba(255, 255, 255, 0.92);
    --color-image-placeholder: #e9e6e1;

    /* ============ TIPOGRAFÍA ============ */
    /* Sistema nativo: legible, cero descarga de fuentes (performance budget) */
    --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI",
                 Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-numeric: "SF Mono", ui-monospace, "Cascadia Mono", Menlo, monospace;

    /* Escala fluida (clamp) — mobile-first, crece hasta desktop */
    --text-caption: 0.75rem;                                   /* 12px */
    --text-label:   0.8125rem;                                 /* 13px */
    --text-body:    1rem;                                      /* 16px */
    --text-subhead: 1.125rem;                                  /* 18px */
    --text-heading: clamp(1.25rem, 1.1rem + 0.6vw, 1.5rem);    /* 20–24px */
    --text-display: clamp(1.5rem, 1.2rem + 1.5vw, 2.25rem);    /* 24–36px */
    --text-price:   clamp(1.375rem, 1.2rem + 0.8vw, 1.75rem);  /* precios */

    --weight-regular: 400;
    --weight-medium: 500;
    --weight-semibold: 600;
    --weight-bold: 700;

    --leading-tight: 1.15;
    --leading-snug: 1.3;
    --leading-body: 1.55;
    --leading-relaxed: 1.65;

    --tracking-tight: -0.02em;
    --tracking-label: 0.02em;

    /* ============ ESPACIADO — escala base 4px ============ */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 24px;
    --space-6: 32px;
    --space-7: 48px;
    --space-8: 64px;
    --space-9: 96px;

    /* ============ RADIUS — escala consistente ============ */
    --radius-xs: 6px;    /* badges, chips */
    --radius-sm: 10px;   /* inputs, botones */
    --radius-md: 14px;   /* tarjetas */
    --radius-lg: 20px;   /* sheets, drawers */
    --radius-xl: 28px;   /* modales grandes */
    --radius-full: 9999px;

    /* ============ ELEVACIÓN — sombras sutiles, luz física ============ */
    --shadow-1: 0 1px 2px rgba(20, 24, 31, 0.05);
    --shadow-2: 0 2px 8px rgba(20, 24, 31, 0.07), 0 1px 2px rgba(20, 24, 31, 0.04);
    --shadow-3: 0 8px 24px rgba(20, 24, 31, 0.10), 0 2px 6px rgba(20, 24, 31, 0.05);
    --shadow-focus: 0 0 0 3px var(--color-accent-subtle),
                    0 0 0 1.5px var(--color-accent);

    /* ============ MOTION — sistema de curvas y duraciones ============ */
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-out-soft: cubic-bezier(0.25, 1, 0.5, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

    --duration-instant: 100ms;
    --duration-fast: 180ms;
    --duration-normal: 300ms;
    --duration-slow: 450ms;

    /* ============ LAYOUT ============ */
    --header-height: 64px;
    --max-content: 1180px;
    --touch-target: 44px;   /* mínimo accesible */
    --safe-bottom: env(safe-area-inset-bottom, 0px);
    --safe-top: env(safe-area-inset-top, 0px);
}

/* ============ DARK MODE — diseñado, no invertido ============ */
/* Superficies cálidas oscuras (azul-noche), acento terracota más luminoso,
   sombras sustituidas por bordes luminosos sutiles. */
@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #101216;
        --color-surface: #181b21;
        --color-surface-elevated: #1f232b;
        --color-surface-sunken: #0c0e11;
        --color-overlay: rgba(16, 18, 22, 0.82);

        --color-ink: #eef0f4;
        --color-ink-secondary: #a8b0bc;
        --color-ink-muted: #8b93a1;            /* 5.57:1 sobre surface oscuro (WCAG AA) */

        --color-border: rgba(238, 240, 244, 0.10);
        --color-border-strong: rgba(238, 240, 244, 0.20);

        --color-accent: #f0682e;             /* terracota elevada en oscuro */
        --color-accent-hover: #ff7d42;
        --color-accent-subtle: rgba(240, 104, 46, 0.14);

        --color-scrim: rgba(0, 0, 0, 0.6);

        --color-link: #6d9bff;
        --color-success: #34d17b;
        --color-warning: #f5a63b;
        --color-error: #f2574d;
        --color-info: #3ea8e5;

        --color-badge: rgba(24, 27, 33, 0.92);
        --color-image-placeholder: #22262e;

        --shadow-1: 0 1px 2px rgba(0, 0, 0, 0.3);
        --shadow-2: 0 2px 8px rgba(0, 0, 0, 0.35), 0 1px 2px rgba(0, 0, 0, 0.25);
        --shadow-3: 0 8px 24px rgba(0, 0, 0, 0.45), 0 2px 6px rgba(0, 0, 0, 0.3);
    }
}

/* ==========================================================================
   RESET + BASE
   ========================================================================== */

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

html {
    font-family: var(--font-sans);
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    background-color: var(--color-bg);
    color: var(--color-ink);
}

body {
    min-height: 100vh;
    line-height: var(--leading-body);
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a, button, input, select, textarea {
    font-family: inherit;
    color: inherit;
    -webkit-tap-highlight-color: transparent;
}

a { text-decoration: none; }
button { background: none; border: none; cursor: pointer; }
img { display: block; max-width: 100%; height: auto; }

/* Foco accesible — nunca oculto (WCAG 2.2) */
:focus-visible {
    outline: none;
    box-shadow: var(--shadow-focus);
    border-radius: var(--radius-xs);
}

/* Reduced motion: neutraliza animaciones decorativas */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
    background: var(--color-ink-muted);
    border-radius: var(--radius-full);
}

/* ==========================================================================
   UTILIDADES ACCESIBLES
   ========================================================================== */

.sr-only {
    position: absolute;
    width: 1px; height: 1px;
    padding: 0; margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap; border: 0;
}

/* ==========================================================================
   COMPONENTES BASE DEL SISTEMA
   ========================================================================== */

/* ---------- Navegación superior (única fuente, todas las páginas) ---------- */
.nx-header {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    padding: 0 var(--space-4);
    padding-top: var(--safe-top);
    background: var(--color-overlay);
    backdrop-filter: blur(18px) saturate(1.4);
    -webkit-backdrop-filter: blur(18px) saturate(1.4);
    border-bottom: 1px solid var(--color-border);
}

.nx-logo {
    font-size: var(--text-heading);
    font-weight: var(--weight-bold);
    letter-spacing: var(--tracking-tight);
    color: var(--color-ink);
    display: flex;
    align-items: center;
    min-height: var(--touch-target);
    flex-shrink: 0;
}

.nx-logo em {
    font-style: normal;
    color: var(--color-accent);
}

/* Nav principal del header: oculta en móvil (la sustituye .nx-bottomnav),
   visible desde tablet. */
.nx-header__nav {
    display: none;
    gap: var(--space-1);
    align-items: center;
}
.nx-header__nav a {
    font-size: var(--text-label);
    font-weight: var(--weight-medium);
    color: var(--color-ink-secondary);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-full);
    min-height: var(--touch-target);
    display: inline-flex;
    align-items: center;
    transition: color var(--duration-fast), background var(--duration-fast);
}
.nx-header__nav a:hover { color: var(--color-ink); background: var(--color-surface-sunken); }
.nx-header__nav a.active { color: var(--color-accent); font-weight: var(--weight-semibold); }
.nx-header__nav a.account-link { border: 1px solid var(--color-border); }
.nx-header__nav a.account-link.logged {
    color: var(--color-accent);
    font-weight: var(--weight-semibold);
    border-color: var(--color-accent);
}
@media (min-width: 768px) {
    .nx-header__nav { display: flex; }
}

/* ---------- Navegación inferior (móvil, ergonomía de pulgar) ---------- */
.nx-bottomnav {
    position: fixed;
    left: 0; right: 0; bottom: 0;
    z-index: 400;
    display: flex;
    background: var(--color-overlay);
    backdrop-filter: blur(18px) saturate(1.4);
    -webkit-backdrop-filter: blur(18px) saturate(1.4);
    border-top: 1px solid var(--color-border);
    padding: var(--space-1) var(--space-2) calc(var(--space-1) + var(--safe-bottom));
}
.nx-bottomnav a {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    min-height: 52px;
    padding: var(--space-1) 0;
    border-radius: var(--radius-sm);
    font-size: 10px;
    font-weight: var(--weight-medium);
    color: var(--color-ink-muted);
    transition: color var(--duration-fast);
}
.nx-bottomnav a svg { width: 22px; height: 22px; }
.nx-bottomnav a.active { color: var(--color-accent); font-weight: var(--weight-semibold); }
.nx-bottomnav a:active { background: var(--color-accent-subtle); }
@media (min-width: 768px) {
    .nx-bottomnav { display: none; }
}
/* Reserva de espacio para la bottom nav en móvil */
@media (max-width: 767.98px) {
    body { padding-bottom: calc(60px + var(--safe-bottom)); }
}

/* ---------- Botones ---------- */
.nx-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    min-height: var(--touch-target);
    padding: var(--space-2) var(--space-5);
    border-radius: var(--radius-full);
    font-size: var(--text-body);
    font-weight: var(--weight-semibold);
    transition: transform var(--duration-fast) var(--ease-out-expo),
                background-color var(--duration-fast) var(--ease-out-expo);
}

.nx-btn:active { transform: scale(0.97); }

.nx-btn--primary {
    background: var(--color-accent);
    color: var(--color-ink-on-accent);
}
.nx-btn--primary:hover { background: var(--color-accent-hover); }

.nx-btn--secondary {
    background: var(--color-surface);
    color: var(--color-ink);
    border: 1px solid var(--color-border-strong);
}
.nx-btn--secondary:hover { border-color: var(--color-ink); }

.nx-btn--tertiary {
    background: transparent;
    color: var(--color-ink-secondary);
}
.nx-btn--tertiary:hover { color: var(--color-ink); }

.nx-btn--destructive {
    background: var(--color-error);
    color: #fff;
}

/* ---------- Inputs ---------- */
.nx-input, .nx-select {
    min-height: var(--touch-target);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    background: var(--color-surface-sunken);
    font-size: var(--text-body);
    color: var(--color-ink);
    outline: none;
    transition: border-color var(--duration-fast) var(--ease-out-expo),
                background-color var(--duration-fast) var(--ease-out-expo);
}

.nx-input:focus, .nx-select:focus {
    border-color: var(--color-accent);
    background: var(--color-surface);
}

.nx-input::placeholder { color: var(--color-ink-muted); }

/* ---------- Tarjeta de propiedad (única fuente del sistema) ---------- */
.nx-card {
    position: relative;
    display: flex;
    flex-direction: column;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-1);
    transition: transform var(--duration-normal) var(--ease-out-expo),
                box-shadow var(--duration-normal) var(--ease-out-expo);
}

/* Card clicable sin nesting interactivo: el enlace del título cubre toda
   la tarjeta; elementos interactivos propios (fav) quedan por encima. */
.nx-card__link { color: inherit; }
.nx-card__link::after {
    content: "";
    position: absolute;
    inset: 0;
    z-index: 1;
}

@media (hover: hover) {
    .nx-card:hover {
        transform: translateY(-3px);
        box-shadow: var(--shadow-2);
    }
}

.nx-card__media {
    position: relative;
    aspect-ratio: 4 / 3;
    background: var(--color-image-placeholder);
    overflow: hidden;
}

.nx-card__media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--duration-slow) var(--ease-out-expo);
}

@media (hover: hover) {
    .nx-card:hover .nx-card__media img { transform: scale(1.03); }
}

.nx-card__badge {
    position: absolute;
    top: var(--space-3);
    left: var(--space-3);
    padding: var(--space-1) var(--space-3);
    background: var(--color-badge);
    color: var(--color-ink);
    border-radius: var(--radius-xs);
    font-size: var(--text-caption);
    font-weight: var(--weight-semibold);
    text-transform: uppercase;
    letter-spacing: var(--tracking-label);
    backdrop-filter: blur(8px);
}

.nx-card__badge--demo {
    /* esquina inferior derecha: la superior derecha la ocupa el botón de favoritos */
    left: auto;
    right: var(--space-3);
    top: auto;
    bottom: var(--space-3);
    background: var(--color-ink);
    color: var(--color-surface);
}

.nx-card__body {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    padding: var(--space-4);
    flex-grow: 1;
}

.nx-card__price {
    font-size: var(--text-price);
    font-weight: var(--weight-bold);
    letter-spacing: var(--tracking-tight);
    font-variant-numeric: tabular-nums;
}

.nx-card__title {
    font-size: var(--text-body);
    font-weight: var(--weight-semibold);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.nx-card__location {
    font-size: var(--text-label);
    color: var(--color-ink-secondary);
}

.nx-card__specs {
    display: flex;
    gap: var(--space-4);
    padding-top: var(--space-3);
    margin-top: var(--space-1);
    border-top: 1px solid var(--color-border);
    font-size: var(--text-label);
    color: var(--color-ink-secondary);
    font-variant-numeric: tabular-nums;
}

/* ---------- Feedback: skeleton ---------- */
.nx-skeleton {
    background: linear-gradient(
        90deg,
        var(--color-image-placeholder) 25%,
        var(--color-surface) 50%,
        var(--color-image-placeholder) 75%
    );
    background-size: 200% 100%;
    animation: nx-shimmer 1.4s infinite var(--ease-out-soft);
    border-radius: var(--radius-xs);
}

@keyframes nx-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ---------- Feedback: estados ---------- */
.nx-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
    padding: var(--space-8) var(--space-5);
    text-align: center;
    color: var(--color-ink-secondary);
}

.nx-state h2 {
    font-size: var(--text-heading);
    font-weight: var(--weight-bold);
    color: var(--color-ink);
}

.nx-state__icon {
    width: 56px; height: 56px;
    border-radius: var(--radius-full);
    background: var(--color-surface-sunken);
    display: flex; align-items: center; justify-content: center;
    color: var(--color-ink-muted);
}
.nx-state__icon svg { width: 26px; height: 26px; }

/* ---------- Chips (filtros, categorías) ---------- */
.nx-chip {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    min-height: var(--touch-target);
    padding: var(--space-1) var(--space-4);
    border-radius: var(--radius-full);
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    font-size: var(--text-label);
    font-weight: var(--weight-medium);
    color: var(--color-ink-secondary);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out-expo);
    position: relative;
    white-space: nowrap;
}
.nx-chip:hover { border-color: var(--color-border-strong); color: var(--color-ink); }
.nx-chip.active {
    background: var(--color-ink);
    color: var(--color-bg);
    border-color: var(--color-ink);
}
.nx-chip select { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; }

/* ---------- Bottom sheet / modal sheet ---------- */
.nx-scrim {
    position: fixed;
    inset: 0;
    z-index: 550;
    background: var(--color-scrim);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--duration-normal) var(--ease-out-expo);
}
.nx-scrim.open { opacity: 1; pointer-events: auto; }

.nx-sheet {
    position: fixed;
    left: 0; right: 0; bottom: 0;
    z-index: 600;
    background: var(--color-surface);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    box-shadow: var(--shadow-3);
    transform: translateY(105%);
    transition: transform var(--duration-normal) var(--ease-out-expo);
    max-height: min(82dvh, 640px);
    display: flex;
    flex-direction: column;
    padding-bottom: var(--safe-bottom);
}
.nx-sheet.open { transform: translateY(0); }
.nx-sheet__handle {
    width: 40px; height: 4px;
    border-radius: var(--radius-full);
    background: var(--color-border-strong);
    margin: var(--space-2) auto;
    flex-shrink: 0;
}
.nx-sheet__head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-2) var(--space-5) var(--space-3);
    border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
}
.nx-sheet__title { font-size: var(--text-subhead); font-weight: var(--weight-bold); letter-spacing: var(--tracking-tight); }
.nx-sheet__body {
    overflow-y: auto;
    padding: var(--space-4) var(--space-5);
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
    -webkit-overflow-scrolling: touch;
}
.nx-sheet__foot {
    display: flex;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-5) var(--space-4);
    border-top: 1px solid var(--color-border);
    flex-shrink: 0;
}
.nx-sheet__foot .nx-btn { flex: 1; }
@media (min-width: 768px) {
    .nx-sheet {
        left: 50%; right: auto; bottom: auto;
        top: 50%;
        transform: translate(-50%, -46%);
        width: min(480px, calc(100vw - var(--space-6)));
        border-radius: var(--radius-xl);
        opacity: 0;
        transition: transform var(--duration-normal) var(--ease-out-expo),
                    opacity var(--duration-normal) var(--ease-out-expo);
    }
    .nx-sheet.open { transform: translate(-50%, -50%); opacity: 1; }
    .nx-sheet__handle { display: none; }
}

/* Grupo de opciones dentro de sheets (segmented control) */
.nx-optgroup { display: flex; flex-direction: column; gap: var(--space-2); }
.nx-optgroup__label {
    font-size: var(--text-caption);
    font-weight: var(--weight-semibold);
    text-transform: uppercase;
    letter-spacing: var(--tracking-label);
    color: var(--color-ink-muted);
}
.nx-optgroup__row { display: flex; flex-wrap: wrap; gap: var(--space-2); }

/* ---------- Toast (feedback efímero) ---------- */
.nx-toast {
    position: fixed;
    left: 50%;
    bottom: calc(76px + var(--safe-bottom));
    transform: translate(-50%, 12px);
    z-index: 900;
    background: var(--color-ink);
    color: var(--color-bg);
    padding: var(--space-3) var(--space-5);
    border-radius: var(--radius-full);
    font-size: var(--text-label);
    font-weight: var(--weight-medium);
    box-shadow: var(--shadow-3);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--duration-fast) var(--ease-out-expo),
                transform var(--duration-fast) var(--ease-out-expo);
    max-width: calc(100vw - var(--space-6));
    text-align: center;
}
.nx-toast.show { opacity: 1; transform: translate(-50%, 0); }
@media (min-width: 768px) {
    .nx-toast { bottom: var(--space-6); }
}

/* ---------- Marcadores de precio del mapa (única fuente) ---------- */
.nx-price-marker {
    background: var(--color-surface);
    border: 1.5px solid var(--color-border-strong);
    border-radius: var(--radius-full);
    padding: 4px 10px;
    font-size: var(--text-caption);
    font-weight: var(--weight-bold);
    color: var(--color-ink);
    box-shadow: var(--shadow-1);
    white-space: nowrap;
    transition: transform var(--duration-fast) var(--ease-spring),
                background var(--duration-fast) var(--ease-out-expo),
                color var(--duration-fast) var(--ease-out-expo);
    cursor: pointer;
    font-variant-numeric: tabular-nums;
}
.nx-price-marker.selected,
.nx-price-marker.active-marker {
    background: var(--color-accent);
    color: var(--color-ink-on-accent);
    border-color: var(--color-accent);
    transform: scale(1.12);
    box-shadow: var(--shadow-2);
    z-index: 999 !important;
}

/* ---------- Entrada con reveal ---------- */
@media (prefers-reduced-motion: no-preference) {
    .nx-reveal { animation: nx-reveal var(--duration-slow) var(--ease-out-expo) both; }
    @keyframes nx-reveal {
        from { opacity: 0; transform: translateY(10px); }
        to { opacity: 1; transform: translateY(0); }
    }
}

/* ==========================================================================
   ALIAS DE COMPATIBILIDAD (transición desde variables legacy)
   Estos nombres antiguos apuntan al nuevo sistema; se eliminarán en
   una fase posterior una vez migradas todas las páginas.
   ========================================================================== */
:root {
    --bg-primary: var(--color-surface);
    --bg-secondary: var(--color-bg);
    --bg-tertiary: var(--color-surface-sunken);
    --bg-overlay: var(--color-overlay);
    --text-primary: var(--color-ink);
    --text-secondary: var(--color-ink-secondary);
    --text-tertiary: var(--color-ink-muted);
    --text-on-accent: var(--color-ink-on-accent);
    --accent: var(--color-accent);
    --accent-hover: var(--color-accent-hover);
    --accent-light: var(--color-accent-subtle);
    --interactive-blue: var(--color-link);
    --interactive-blue-hover: var(--color-link);
    --border-subtle: var(--color-border);
    --border-default: var(--color-border-strong);
    --border-focus: var(--color-accent);
    --success: var(--color-success);
    --error: var(--color-error);
    --text-xs: var(--text-caption);
    --text-sm: var(--text-label);
    --text-base: var(--text-body);
    --text-md: var(--text-subhead);
    --text-lg: var(--text-heading);
    --text-xl: var(--text-heading);
    --text-xxl: var(--text-display);
    --weight-normal: var(--weight-regular);
    --line-height-tight: var(--leading-tight);
    --line-height-normal: var(--leading-body);
    --line-height-relaxed: var(--leading-relaxed);
    --radius-sm: var(--radius-sm);
    --radius-md: var(--radius-md);
    --radius-lg: var(--radius-lg);
    --radius-xl: var(--radius-xl);
    --radius-round: var(--radius-full);
    --shadow-sm: var(--shadow-1);
    --shadow-md: var(--shadow-2);
    --shadow-lg: var(--shadow-3);
    --ease-apple: var(--ease-out-expo);
    --transition-fast: all var(--duration-fast) var(--ease-out-expo);
    --transition-normal: all var(--duration-normal) var(--ease-out-expo);
    --transition-slow: all var(--duration-slow) var(--ease-out-expo);
    --max-width-content: var(--max-content);
    --safe-bottom-mobile: var(--safe-bottom);
}

/* ===== NEXO footer (05.21) ===== */
.nx-footer {
    border-top: 1px solid var(--color-border);
    background: var(--color-surface);
    margin-top: var(--space-7);
    padding: var(--space-6) var(--space-4) calc(var(--space-6) + var(--safe-bottom));
}
.nx-footer__inner {
    max-width: var(--max-content);
    margin-inline: auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}
.nx-footer__brand { display: flex; align-items: baseline; gap: var(--space-2); }
.nx-footer__logo { font-weight: 800; letter-spacing: -0.02em; color: var(--color-ink); }
.nx-footer__tag { font-size: var(--text-caption); color: var(--color-ink-muted); }
.nx-footer__cols {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
}
.nx-footer__col { display: flex; flex-direction: column; gap: var(--space-1); }
.nx-footer__col-title {
    font-size: var(--text-caption);
    font-weight: var(--weight-semibold);
    text-transform: uppercase;
    letter-spacing: var(--tracking-label);
    color: var(--color-ink-muted);
    margin-bottom: var(--space-1);
}
.nx-footer__col a {
    font-size: var(--text-label); color: var(--color-ink-secondary); text-decoration: none;
    min-height: 36px; display: inline-flex; align-items: center;
}
.nx-footer__col a:hover { color: var(--color-accent); }
.nx-footer__nav { display: flex; flex-wrap: wrap; gap: var(--space-3); }
.nx-footer__nav a {
    font-size: var(--text-label); color: var(--color-ink-secondary); text-decoration: none;
    min-height: var(--touch-target); display: inline-flex; align-items: center;
}
.nx-footer__nav a:hover { color: var(--color-accent); }
.nx-footer__legal {
    font-size: var(--text-caption); color: var(--color-ink-muted); margin: 0; line-height: var(--leading-body);
}
.nx-footer__legal a { color: inherit; }
.nx-footer__legal a:hover { color: var(--color-accent); }
@media (min-width: 768px) {
    .nx-footer__inner { flex-direction: row; align-items: center; justify-content: space-between; }
}

/* ===== Banner de modo demostración (demo-banner.js) ===== */
#demo-banner {
    position: sticky;
    top: 0;
    z-index: 1200;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    background: var(--color-surface-sunken);
    color: var(--color-ink-secondary);
    border-bottom: 1px solid var(--color-border);
    text-align: center;
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-caption);
    font-weight: var(--weight-medium);
    font-family: var(--font-sans);
}
#demo-banner strong { color: var(--color-ink); font-weight: var(--weight-semibold); }
#demo-banner svg { flex-shrink: 0; color: var(--color-warning); }