/* Tema dark ENE (DESIGN-DARK.md "Hydro-Clean Professional — Dark", jul 2026):
           fondo azul-noche, cian neón #4FD8EB, azul eléctrico #2E9BFF y violeta #8B5CF6
           tomados de las placas promocionales. Elevación por bordes luminosos y glow. */
        :root {
            --bg-main: #060B14;
            --bg-deep: #0A1220;
            --panel: rgba(8,14,26,0.82);
            --panel-strong: rgba(10,17,30,0.96);
            --text-main: #EDF2F7;
            --text-soft: #C5D3E0;
            --text-muted: #93A5B8;
            --line-soft: rgba(79,216,235,0.15);
            --line-mid: rgba(79,216,235,0.26);
            --shadow-soft: 0 4px 20px rgba(79,216,235,0.08);
            --shadow-strong: 0 12px 40px rgba(79,216,235,0.14);
            --radius-xl: 24px;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-btn: 8px;
            --accent-cyan: #4FD8EB;
            --cyan-electric: #4FD8EB;
            --cyan-deep: #38BFD6;
            --cyan-dark: #21A8C4;
            --cyan-subtle: rgba(79,216,235,0.14);
            --cyan-glow: rgba(79,216,235,0.15);
            --accent-violet: #8B5CF6;
            --violet-electric: #A78BFA;
            --violet-subtle: rgba(139,92,246,0.14);
            --violet-glow: rgba(139,92,246,0.16);
            --aqua: #B0E0E9;
            --aqua-border: rgba(79,216,235,0.30);
            --grad-primary: linear-gradient(135deg, #2E9BFF 0%, #4FD8EB 100%);
            --grad-hero: linear-gradient(165deg, rgba(13,22,38,0.94) 0%, rgba(16,26,44,0.90) 55%, rgba(6,11,20,0.96) 100%);
            --surface-card: linear-gradient(180deg, rgba(20,32,52,0.90) 0%, rgba(11,18,31,0.96) 100%);
            --error: #F87171;
            --warning: #FBBF24;
            /* Acento secundario = naranja de marca ENE (eneneuquen.com.ar, gráficos "swirly") */
            --ene-orange: #E1522C;
            --ene-gold: #F0C764;
            --grad-ene: linear-gradient(120deg, #E1522C 0%, #F0C764 100%);
            --accent-warm: #F9BA80; /* ámbar ENE aclarado para texto (contraste AA sobre oscuro) */
        }

        @keyframes dot-pulse {
            0%, 100% { box-shadow: 0 0 10px rgba(79,216,235,0.35); transform: scale(1); }
            50% { box-shadow: 0 0 20px rgba(79,216,235,0.55), 0 0 40px rgba(79,216,235,0.20), 0 0 60px rgba(79,216,235,0.18); transform: scale(1.18); }
        }

        @keyframes violet-aurora {
            0%, 100% { transform: scale(1) translate(0, 0); opacity: 0.10; }
            33%  { transform: scale(1.08) translate(-20px, 16px); opacity: 0.14; }
            66%  { transform: scale(0.96) translate(18px, -12px); opacity: 0.07; }
        }

        @keyframes hero-text-shimmer {
            to { background-position: 200% center; }
        }

        @keyframes aurora-breathe {
            0%, 100% { transform: scale(1) translate(0, 0); opacity: 0.14; }
            33%  { transform: scale(1.12) translate(24px, -18px); opacity: 0.22; }
            66%  { transform: scale(0.94) translate(-16px, 22px); opacity: 0.10; }
        }

        @keyframes ring-float {
            0%, 100% { transform: scale(1) translate(0, 0); }
            50% { transform: scale(1.05) translate(10px, -14px); }
        }

        @keyframes kicker-glow {
            0%, 100% { box-shadow: 0 0 8px rgba(79,216,235,0.08); }
            50%       { box-shadow: 0 2px 12px rgba(79,216,235,0.18); }
        }

        * { box-sizing: border-box; }
        html {
            scroll-behavior: smooth;
            background-color: #060B14;
        }

        body {
            margin: 0;
            font-family: 'Open Sans', sans-serif;
            color: var(--text-main);
            background: transparent;
            overflow-x: hidden;
            position: relative;
            isolation: isolate;
        }

        /* ── Foto del edificio ENE como fondo global (fija, con velo oscuro).
           Los divs #bg-photo / #bg-overlay los inyecta js/layout.js en todas las páginas. ── */
        #bg-photo {
            position: fixed;
            inset: -10px;
            z-index: -1;
            background: url('../imagenes/POLO3.webp') center / cover no-repeat;
            filter: blur(5px) brightness(1.05) saturate(0.85);
            pointer-events: none;
        }

        #bg-overlay {
            position: fixed;
            inset: 0;
            z-index: -1;
            pointer-events: none;
            background:
                radial-gradient(circle at 15% 10%, rgba(79,216,235,0.08) 0, transparent 28%),
                radial-gradient(circle at 85% 15%, rgba(79,216,235,0.12) 0, transparent 26%),
                radial-gradient(circle at 50% 95%, rgba(79,216,235,0.05) 0, transparent 32%),
                radial-gradient(circle at 20% 80%, rgba(79,216,235,0.08) 0, transparent 24%),
                rgba(16,26,44,0.80);
        }

        body::before {
            content: '';
            position: fixed;
            inset: 0;
            pointer-events: none;
            z-index: -2;
            background:
                linear-gradient(rgba(79,216,235,0.05) 1px, transparent 1px),
                linear-gradient(90deg, rgba(79,216,235,0.05) 1px, transparent 1px);
            background-size: 38px 38px;
            opacity: 0.50;
        }

        h1, h2, h3, h4, h5, h6 {
            margin: 0;
            font-family: 'Open Sans', sans-serif;
            letter-spacing: -0.02em;
        }

        p {
            margin: 0 0 0.9em 0;
            line-height: 1.7;
        }

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

        nav {
            position: fixed;
            inset: 0 0 auto 0;
            z-index: 1000;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 14px 40px;
            background: var(--panel);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--aqua-border);
            box-shadow: var(--shadow-soft);
        }

        /* ── Left: logo + toggle ── */
        .nav-left {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        /* Logo PNG negro -> blanco sobre el tema oscuro */
        .nav-logo img,
        .footer-logo img {
            filter: brightness(0) invert(1);
        }

        .nav-logo::before {
            content: '';
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: var(--cyan-electric);
            box-shadow: 0 0 16px rgba(79,216,235,0.40);
            animation: dot-pulse 2.8s ease-in-out infinite;
            flex-shrink: 0;
        }

        /* ── Right: CTA + Login ── */
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        /* ── Center: page links ── */
        .nav-links {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            gap: 6px;
            align-items: center;
            justify-content: center;
        }

        .nav-links a {
            padding: 9px 16px;
            border-radius: 999px;
            font-size: 0.84rem;
            font-weight: 600;
            color: var(--text-soft);
            border: 1px solid transparent;
            transition: all 0.22s ease;
        }

        .nav-links a:hover {
            color: var(--text-main);
            background: rgba(79,216,235,0.05);
            border-color: var(--line-soft);
        }

        .nav-links .nav-link-page {
            color: var(--text-soft);
            border-color: var(--line-soft);
        }

        .nav-links .nav-link-page:hover {
            color: var(--accent-cyan);
            background: rgba(79,216,235,0.1);
            border-color: rgba(79,216,235,0.28);
        }

        .nav-links .nav-link-active {
            color: var(--accent-cyan) !important;
            background: rgba(79,216,235,0.12) !important;
            border-color: rgba(79,216,235,0.30) !important;
        }

        /* ── Right: Membresía CTA ── */
        .nav-cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 22px;
            border-radius: var(--radius-btn);
            background: var(--cyan-electric);
            color: #001F25;
            font-family: 'Open Sans', sans-serif;
            font-size: 0.84rem;
            font-weight: 700;
            letter-spacing: 0.03em;
            text-transform: uppercase;
            text-decoration: none;
            white-space: nowrap;
            flex-shrink: 0;
            transition: background 0.22s ease, transform 0.22s ease, box-shadow 0.28s ease;
            box-shadow: 0 4px 18px rgba(79,216,235,0.22);
        }

        .nav-cta-btn:hover {
            background: var(--cyan-dark);
            transform: translateY(-1px);
            box-shadow: 0 7px 24px rgba(79,216,235,0.30);
        }

        /* ── Right: Login secondary btn (Soft Aqua per DESIGN.md) ── */
        .nav-login-btn {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            padding: 10px 20px;
            border-radius: var(--radius-btn);
            background: rgba(79,216,235,0.10);
            border: 1px solid rgba(79,216,235,0.40);
            color: var(--accent-cyan);
            font-family: 'Open Sans', sans-serif;
            font-size: 0.84rem;
            font-weight: 700;
            letter-spacing: 0.03em;
            text-transform: uppercase;
            text-decoration: none;
            white-space: nowrap;
            flex-shrink: 0;
            transition: all 0.22s ease;
        }

        .nav-login-btn:hover {
            background: rgba(79,216,235,0.20);
            border-color: rgba(79,216,235,0.60);
            color: #A8ECFB;
            transform: translateY(-1px);
            box-shadow: var(--shadow-soft);
        }

        .screen {
            min-height: auto;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 96px 52px;
            position: relative;
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.75s ease, transform 0.75s ease;
        }

        .screen.visible {
            opacity: 1;
            transform: translateY(0);
        }

        .content-wrapper {
            max-width: 1180px;
            width: 100%;
            margin: 0 auto;
            position: relative;
            z-index: 2;
        }

        .section-shell {
            background: var(--surface-card);
            border: 1px solid var(--line-soft);
            border-radius: var(--radius-xl);
            padding: 36px;
            box-shadow: var(--shadow-soft);
            position: relative;
            overflow: hidden;
        }

        .section-shell::before {
            content: '';
            position: absolute;
            inset: 0;
            pointer-events: none;
            border-radius: inherit;
            background:
                linear-gradient(180deg, rgba(79,216,235,0.11) 0%, transparent 16%),
                radial-gradient(circle at top left, rgba(79,216,235,0.17) 0, transparent 36%),
                radial-gradient(circle at bottom right, rgba(139,92,246,0.12) 0, transparent 32%);
        }

        .section-title {
            text-align: center;
            font-size: clamp(2.3rem, 4.7vw, 4.5rem);
            font-weight: 800;
            margin-bottom: 18px;
            opacity: 0;
            transform: translateY(18px);
            transition: opacity 0.65s ease, transform 0.65s ease;
        }

        .section-title.visible {
            opacity: 1;
            transform: translateY(0);
        }

        .section-title::after {
            content: '';
            display: block;
            width: 0;
            height: 3px;
            margin: 20px auto 0 auto;
            opacity: 0;
            border-radius: 999px;
            background: var(--grad-ene);
            transition: width 0.7s ease 0.25s, opacity 0.5s ease 0.25s;
        }

        .section-title.visible::after {
            width: 132px;
            opacity: 1;
        }

        .section-subtitle {
            text-align: center;
            max-width: 800px;
            margin: 0 auto 56px auto;
            font-size: 1.14rem;
            color: var(--text-muted);
            opacity: 0;
            transform: translateY(18px);
            transition: opacity 0.65s ease 0.1s, transform 0.65s ease 0.1s;
        }

        .section-subtitle.visible {
            opacity: 1;
            transform: translateY(0);
        }

        .mission-box {
            background: var(--surface-card);
            border: 1px solid var(--line-soft);
            border-radius: var(--radius-xl);
            padding: 44px;
            margin-bottom: 52px;
            box-shadow: var(--shadow-soft);
            text-align: center;
            position: relative;
            overflow: hidden;
            opacity: 0;
            transform: translateY(20px);
            transition: opacity 0.65s ease, transform 0.65s ease;
        }

        .mission-box::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(79,216,235,0.16) 0, rgba(79,216,235,0.06) 50%, transparent 70%);
            pointer-events: none;
        }

        .mission-box.visible { opacity: 1; transform: translateY(0); }

        .mission-box::after {
            content: '';
            position: absolute;
            left: 28px; right: 28px; top: 0;
            height: 4px;
            border-radius: 0 0 8px 8px;
            background: linear-gradient(to right, var(--cyan-electric), var(--violet-electric), rgba(79,216,235,0.1));
        }

        .mission-box p {
            font-size: 1.15rem;
            color: var(--text-soft);
            max-width: 860px;
            margin-left: auto;
            margin-right: auto;
            position: relative;
            z-index: 1;
        }

        .mission-box strong, .mission-box .highlight {
            color: var(--text-main);
            font-weight: 800;
        }

        .milestone-card {
            background: var(--surface-card);
            border: 1px solid var(--line-soft);
            border-radius: var(--radius-lg);
            padding: 30px;
            box-shadow: var(--shadow-soft);
            position: relative;
            overflow: hidden;
            opacity: 0;
            transform: translateY(20px);
            transition: opacity 0.65s ease, transform 0.65s ease, border-color 0.25s ease;
        }

        .milestone-card.visible { opacity: 1; transform: translateY(0); }

        .milestone-card:hover {
            border-color: var(--line-mid);
            box-shadow: 0 8px 28px rgba(79,216,235,0.14);
        }

        .milestone-card::before {
            content: '';
            position: absolute;
            left: 24px; right: 24px; top: 0;
            height: 4px;
            background: linear-gradient(to right, var(--cyan-electric), var(--violet-electric), rgba(79,216,235,0.1));
            border-radius: 0 0 8px 8px;
        }

        .milestone-card::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(79,216,235,0.07) 0, transparent 28%);
            pointer-events: none;
        }

        .milestone-card h4 { font-size: 1.28rem; color: var(--text-main); margin-bottom: 10px; position: relative; z-index: 1; }
        .milestone-card p  { font-size: 0.96rem; color: var(--text-soft); margin: 0; position: relative; z-index: 1; }
        .milestone-card strong { color: var(--text-main); }

        /* ── Membresía cards ── */
        .membership-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-top: 52px;
            margin-bottom: 52px;
            align-items: start;
        }

        .membership-card {
            background: var(--surface-card);
            border: 1px solid var(--line-soft);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            box-shadow: var(--shadow-soft);
            position: relative;
            overflow: hidden;
            opacity: 0;
            transform: translateY(20px);
            transition: opacity 0.65s ease, transform 0.65s ease, border-color 0.25s ease, box-shadow 0.35s ease;
        }

        .membership-card.visible { opacity: 1; transform: translateY(0); }

        .membership-card:hover {
            border-color: var(--line-mid);
            box-shadow: 0 8px 28px rgba(79,216,235,0.14);
        }

        .membership-card::before {
            content: '';
            position: absolute;
            left: 24px; right: 24px; top: 0;
            height: 3px;
            background: linear-gradient(to right, rgba(79,216,235,0.55), rgba(79,216,235,0.24), transparent);
            border-radius: 0 0 8px 8px;
        }

        .membership-card::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(79,216,235,0.06) 0, transparent 28%);
            pointer-events: none;
        }

        .membership-card-featured {
            border-color: rgba(79,216,235,0.32);
            box-shadow: var(--shadow-strong);
            background: linear-gradient(180deg, rgba(79,216,235,0.16) 0%, rgba(22,35,58,0.95) 18%, rgba(13,21,36,0.98) 100%);
        }

        .membership-card-featured::before {
            background: linear-gradient(to right, var(--accent-cyan), var(--accent-violet));
            height: 5px;
        }

        .membership-card-featured:hover {
            box-shadow: 0 16px 48px rgba(79,216,235,0.20);
        }

        .membership-tier-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 14px;
            border-radius: 999px;
            background: var(--cyan-subtle);
            border: 1px solid rgba(79,216,235,0.22);
            font-size: 0.74rem;
            font-weight: 700;
            letter-spacing: 0.05em;
            text-transform: uppercase;
            color: var(--cyan-electric);
            margin-bottom: 20px;
            position: relative;
            z-index: 1;
        }

        .membership-card-featured .membership-tier-badge {
            background: rgba(79,216,235,0.2);
            border-color: rgba(79,216,235,0.42);
        }

        .membership-card h3 { font-size: 1.6rem; color: var(--text-main); margin-bottom: 10px; position: relative; z-index: 1; }

        .membership-card-tagline {
            font-size: 0.96rem;
            color: var(--text-muted);
            margin-bottom: 24px;
            margin-top: 0;
            position: relative;
            z-index: 1;
        }

        .membership-features {
            list-style: none;
            padding: 0;
            margin: 0 0 28px 0;
            position: relative;
            z-index: 1;
        }

        .membership-features li {
            font-size: 0.92rem;
            color: var(--text-soft);
            padding: 9px 0;
            border-bottom: 1px solid var(--line-soft);
            display: flex;
            align-items: flex-start;
            gap: 10px;
            line-height: 1.5;
        }

        .membership-features li:last-child { border-bottom: none; }

        .membership-features li::before {
            content: '›';
            color: var(--cyan-electric);
            font-weight: 700;
            font-size: 1.1rem;
            line-height: 1.4;
            flex-shrink: 0;
        }

        /* ── CTA Button ── */
        .cta-wrap {
            text-align: center;
            margin-top: 8px;
            position: relative;
            z-index: 1;
        }

        .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 15px 36px;
            border-radius: var(--radius-btn);
            background: var(--cyan-electric);
            color: #001F25;
            font-family: 'Open Sans', sans-serif;
            font-size: 0.94rem;
            font-weight: 700;
            letter-spacing: 0.03em;
            text-transform: uppercase;
            text-decoration: none;
            transition: background 0.22s ease, transform 0.22s ease, box-shadow 0.28s ease;
            box-shadow: 0 8px 28px rgba(79,216,235,0.22);
        }

        .btn-cta:hover {
            background: var(--cyan-dark);
            transform: translateY(-2px);
            box-shadow: 0 14px 38px rgba(79,216,235,0.30);
        }

        .btn-cta i { font-size: 1rem; }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 13px 30px;
            border-radius: var(--radius-btn);
            border: 1px solid rgba(79,216,235,0.40);
            color: var(--accent-cyan);
            font-family: 'Open Sans', sans-serif;
            font-size: 0.88rem;
            font-weight: 700;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            text-decoration: none;
            transition: all 0.22s ease;
            position: relative;
            z-index: 1;
        }

        .btn-outline:hover {
            background: rgba(79,216,235,0.1);
            border-color: rgba(79,216,235,0.65);
            box-shadow: var(--shadow-soft);
        }

        /* ── Footer ── */
        footer {
            border-top: 1px solid var(--line-soft);
            padding: 52px 52px 40px 52px;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 28px;
            text-align: center;
            background: linear-gradient(180deg, rgba(8,14,25,0.90) 0%, rgba(5,9,16,0.95) 100%);
        }

        .footer-logo { display: flex; align-items: center; gap: 14px; }

        .footer-logo img {
            height: 44px;
            width: auto;
            object-fit: contain;
            opacity: 0.92;
        }

        .footer-logo span {
            font-family: 'Open Sans', sans-serif;
            font-size: 1.1rem;
            font-weight: 700;
            letter-spacing: 0.05em;
            color: var(--text-muted);
            border-left: 1px solid var(--line-mid);
            padding-left: 14px;
        }

        .footer-links {
            display: flex;
            gap: 18px;
            align-items: center;
            flex-wrap: wrap;
            justify-content: center;
        }

        .footer-links a {
            display: flex;
            align-items: center;
            gap: 7px;
            font-size: 0.88rem;
            color: var(--text-muted);
            padding: 8px 14px;
            border-radius: 999px;
            border: 1px solid var(--line-soft);
            transition: all 0.22s ease;
        }

        .footer-links a:hover {
            color: var(--text-main);
            border-color: var(--line-mid);
            background: rgba(79,216,235,0.08);
        }

        .footer-links a i { font-size: 1rem; }

        .footer-copy {
            font-size: 0.78rem;
            color: var(--text-muted);
        }

        /* ── Vertical pages shared ── */
        .page-hero {
            min-height: 80vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 110px 52px 60px;
        }

        .page-kicker {
            display: inline-block;
            padding: 8px 18px;
            border-radius: 999px;
            background: var(--cyan-subtle);
            border: 1px solid rgba(79,216,235,0.28);
            font-size: 0.78rem;
            font-weight: 700;
            letter-spacing: 0.05em;
            text-transform: uppercase;
            color: var(--cyan-electric);
            margin-bottom: 24px;
            animation: kicker-glow 3s ease-in-out infinite;
        }

        .page-hero h1 {
            font-size: clamp(2.4rem, 5.5vw, 4.8rem);
            line-height: 1.0;
            font-weight: 800;
            margin-bottom: 20px;
        }

        .page-hero h1 span {
            display: inline-block;
            background: linear-gradient(90deg, #4FD8EB 0%, #2E9BFF 28%, #A78BFA 55%, #2E9BFF 78%, #4FD8EB 100%);
            background-size: 200% auto;
            background-clip: text;
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            animation: hero-text-shimmer 4s linear infinite;
        }

        .page-hero-desc {
            font-size: 1.08rem;
            color: var(--text-soft);
            max-width: 680px;
            margin: 0 auto;
            line-height: 1.75;
        }

        .page-hero-desc strong { color: var(--text-main); font-weight: 800; }

        .inner-section { padding: 60px 52px; }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            justify-content: center;
            margin-bottom: 18px;
            font-size: 0.80rem;
            color: var(--text-muted);
            position: relative;
            z-index: 1;
        }

        .breadcrumb a { color: var(--accent-cyan); }
        .breadcrumb a:hover { text-decoration: underline; }
        .breadcrumb i { font-size: 0.65rem; opacity: 0.5; }

        /* ── Problem / use-case cards ── */
        .problem-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 22px;
            margin-top: 44px;
        }

        .problem-card {
            background: var(--surface-card);
            border: 1px solid var(--line-soft);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            position: relative;
            overflow: hidden;
            opacity: 0;
            transform: translateY(20px);
            transition: opacity 0.65s ease, transform 0.65s ease, border-color 0.25s ease, box-shadow 0.35s ease;
        }

        .problem-card.visible { opacity: 1; transform: translateY(0); }

        .problem-card:hover {
            border-color: var(--line-mid);
            box-shadow: 0 8px 28px rgba(79,216,235,0.14);
        }

        .problem-card::before {
            content: '';
            position: absolute;
            left: 20px; right: 20px; top: 0;
            height: 3px;
            background: linear-gradient(to right, var(--cyan-electric), var(--violet-electric), rgba(79,216,235,0.1));
            border-radius: 0 0 6px 6px;
        }

        .problem-card::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(79,216,235,0.06) 0, transparent 30%);
            pointer-events: none;
        }

        .problem-number {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--cyan-electric), var(--violet-electric));
            color: #001F25;
            font-family: 'Open Sans', sans-serif;
            font-size: 0.82rem;
            font-weight: 800;
            margin-bottom: 14px;
            position: relative;
            z-index: 1;
            box-shadow: 0 2px 8px rgba(79,216,235,0.25);
        }

        .problem-card h4 { font-size: 1.05rem; font-weight: 800; color: var(--text-main); margin-bottom: 10px; position: relative; z-index: 1; }
        .problem-card p  { font-size: 0.90rem; color: var(--text-soft); line-height: 1.6; margin: 0; position: relative; z-index: 1; }

        /* ── Referente card ── */
        .referente-card {
            display: flex;
            align-items: flex-start;
            gap: 24px;
            background: var(--surface-card);
            border: 1px solid rgba(79,216,235,0.22);
            border-radius: var(--radius-lg);
            padding: 32px;
            position: relative;
            overflow: hidden;
            max-width: 600px;
            margin: 40px auto 0;
            opacity: 0;
            transform: translateY(20px);
            transition: opacity 0.65s ease, transform 0.65s ease;
        }

        .referente-card.visible { opacity: 1; transform: translateY(0); }

        .referente-card::before {
            content: '';
            position: absolute;
            left: 24px; right: 24px; top: 0;
            height: 4px;
            background: linear-gradient(to right, var(--cyan-electric), var(--violet-electric), rgba(79,216,235,0.1));
            border-radius: 0 0 8px 8px;
        }

        .referente-card::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(79,216,235,0.06) 0, transparent 28%);
            pointer-events: none;
        }

        .referente-avatar {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: linear-gradient(135deg, rgba(79,216,235,0.14), rgba(79,216,235,0.14));
            border: 1px solid rgba(79,216,235,0.30);
            display: flex;
            align-items: center;
            justify-content: center;
            font-family: 'Open Sans', sans-serif;
            font-weight: 800;
            font-size: 1.1rem;
            color: var(--accent-cyan);
            flex-shrink: 0;
            position: relative;
            z-index: 1;
        }

        .referente-info { position: relative; z-index: 1; }
        .referente-info h4 { font-size: 1.18rem; color: var(--text-main); margin-bottom: 6px; }
        .referente-info p  { font-size: 0.90rem; color: var(--text-muted); margin: 0; }

        /* ── Timeline ── */
        .timeline {
            display: flex;
            gap: 24px;
            margin: 52px auto;
            justify-content: center;
            align-items: stretch;
        }

        .timeline-item {
            width: calc(33.33% - 16px);
            opacity: 0;
            transform: translateY(20px);
            transition: opacity 0.65s ease, transform 0.65s ease;
        }

        .timeline-item.visible { opacity: 1; transform: translateY(0); }

        .timeline-content {
            height: 100%;
            background: var(--surface-card);
            border: 1px solid var(--line-soft);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            box-shadow: var(--shadow-soft);
            position: relative;
            overflow: hidden;
        }

        .timeline-content::before {
            content: '';
            position: absolute;
            inset: 0;
            pointer-events: none;
            background: linear-gradient(135deg, rgba(79,216,235,0.07) 0, transparent 30%);
        }

        .timeline-content::after {
            content: '';
            position: absolute;
            top: 0; left: 24px; right: 24px;
            height: 4px;
            background: linear-gradient(to right, var(--cyan-electric), var(--violet-electric), rgba(79,216,235,0.1));
            border-radius: 0 0 8px 8px;
        }

        .timeline-content:hover {
            border-color: var(--line-mid);
            box-shadow: 0 8px 28px rgba(79,216,235,0.14);
        }

        .timeline-content h4 {
            font-size: 1.22rem;
            margin-bottom: 12px;
            color: var(--text-main);
            position: relative;
            z-index: 1;
        }

        .timeline-content p {
            font-size: 0.97rem;
            color: var(--text-soft);
            margin: 0;
            position: relative;
            z-index: 1;
        }

        .timeline-content strong { color: var(--text-main); }

        /* ── Sharing methods ── */
        .sharing-methods {
            list-style: none;
            padding: 0;
            margin: 36px auto 0 auto;
            max-width: 860px;
        }

        .sharing-methods li {
            background: var(--surface-card);
            border: 1px solid var(--line-soft);
            border-left: 5px solid var(--cyan-electric);
            border-radius: var(--radius-md);
            padding: 22px 22px 22px 24px;
            color: var(--text-soft);
            font-size: 1.04rem;
            margin-bottom: 14px;
            box-shadow: var(--shadow-soft);
            position: relative;
            overflow: hidden;
            opacity: 0;
            transform: translateX(-18px);
            transition: opacity 0.65s ease, transform 0.65s ease, border-color 0.25s ease, box-shadow 0.25s ease;
        }

        .sharing-methods li.visible { opacity: 1; transform: translateX(0); }

        .sharing-methods li::before {
            content: '';
            position: absolute;
            inset: 0;
            pointer-events: none;
            background: linear-gradient(135deg, rgba(79,216,235,0.06) 0, transparent 28%);
        }

        .sharing-methods li:hover {
            border-left-color: var(--accent-cyan);
            box-shadow: -4px 0 16px rgba(79,216,235,0.14), var(--shadow-soft);
        }

        .sharing-methods li strong { color: var(--text-main); }

        /* ── Milestones grid ── */
        .milestones-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
            margin-top: 40px;
        }

        @media (max-width: 1024px) {
            nav { padding: 12px 24px; }
            .screen { padding: 100px 28px; }
            .membership-grid { grid-template-columns: 1fr 1fr; }
            .timeline { flex-direction: column; align-items: center; }
            .timeline-item { width: 82%; }
            .inner-section { padding: 50px 28px; }
            .problem-grid { grid-template-columns: 1fr 1fr; }
        }

        @media (max-width: 768px) {
            /* Nav en 2 filas: logo + botones arriba, links en una línea scrolleable abajo */
            nav { flex-wrap: wrap; row-gap: 10px; padding: 10px 14px; }
            .nav-left { width: auto; flex: 1; }
            .nav-actions { gap: 8px; }
            .nav-cta-btn, .nav-login-btn { font-size: 0.72rem; padding: 9px 14px; letter-spacing: 0.03em; gap: 6px; }
            .nav-links {
                width: 100%;
                order: 3;
                flex-wrap: nowrap;
                overflow-x: auto;
                -webkit-overflow-scrolling: touch;
                scrollbar-width: none;
                gap: 8px;
                /* overflow-x: auto fuerza overflow-y a auto → padding vertical para que
                   el borde de los links no se recorte arriba/abajo */
                padding: 8px 4px;
                /* Centrados si entran; si desbordan cae a flex-start sin recortar el inicio */
                justify-content: safe center;
            }
            .nav-links::-webkit-scrollbar { display: none; }
            .nav-links li { flex-shrink: 0; }
            .nav-links a { font-size: 0.8rem; padding: 8px 14px; white-space: nowrap; }
            /* En móvil (1 columna) el escalonado inline no aporta y retrasa la aparición */
            [style*="transition-delay"] { transition-delay: 0s !important; }
            .screen { padding: 86px 18px; }
            .section-shell { padding: 24px; border-radius: 20px; }
            .section-subtitle { font-size: 1rem; margin-bottom: 38px; }
            .mission-box { padding: 26px; }
            .mission-box p { font-size: 1rem; }
            .membership-grid { grid-template-columns: 1fr; gap: 16px; }
            .membership-card-featured { order: -1; }
            .page-hero { padding: 86px 18px 48px; }
            .inner-section { padding: 40px 18px; }
            .problem-grid { grid-template-columns: 1fr; gap: 14px; }
            .referente-card { flex-direction: column; }
            .timeline-item { width: 100%; }
            .timeline-content { padding: 24px; }
            .sharing-methods li { font-size: 0.98rem; }
            .milestones-grid { grid-template-columns: 1fr; gap: 16px; }
            footer { padding: 36px 18px 28px 18px; }
            .footer-links { gap: 10px; }
        }

        /* ── Accesibilidad: respetar preferencia de menos movimiento ── */
        @media (prefers-reduced-motion: reduce) {
            html { scroll-behavior: auto; }
            *, *::before, *::after {
                animation-duration: 0.001ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.001ms !important;
                scroll-behavior: auto !important;
            }
            /* Asegurar que el contenido revelado por scroll quede visible */
            .screen, .section-title, .section-subtitle, .mission-box, .milestone-card,
            .membership-card, .problem-card, .timeline-item, .referente-card,
            .sharing-methods li, .animate-on-scroll {
                opacity: 1 !important;
                transform: none !important;
            }
        }