:root {
    --primary: #673ab7;
    --primary-dark: #4a2b86;
    --secondary: #ff7043;
    --background: #0b0b16;
    --surface: #131329;
    --surface-light: rgba(255, 255, 255, 0.08);
    --text: #f5f5f5;
    --muted: #b9b9d6;
    --max-width: 1100px;
    --shadow: 0 20px 40px rgba(22, 17, 45, 0.45);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Montserrat', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: radial-gradient(circle at top left, rgba(103, 58, 183, 0.2), transparent 50%), radial-gradient(circle at bottom right, rgba(255, 112, 67, 0.15), transparent 55%), var(--background);
    color: var(--text);
    line-height: 1.6;
}

a {
    color: inherit;
    text-decoration: none;
}

    /* Estilos de foco para accesibilidad con teclado */
    a:focus-visible,
    button:focus-visible,
    .button:focus-visible,
    .cta:focus-visible {
        outline: 3px solid var(--secondary);
        outline-offset: 3px;
        border-radius: 4px;
    }

/* Skip link para accesibilidad */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary);
    color: white;
    padding: 8px 16px;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 600;
    z-index: 1000;
    transition: top 0.3s ease;
}

    .skip-link:focus {
        top: 6px;
    }

ul {
    list-style: none;
}

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding: 32px 6vw 96px;
    background: linear-gradient(135deg, rgba(103, 58, 183, 0.95), rgba(39, 27, 64, 0.9));
    overflow: hidden;
}

    .hero::after {
        content: '';
        position: absolute;
        inset: 0;
        background: url('https://www.transparenttextures.com/patterns/cubes.png');
        opacity: 0.12;
        pointer-events: none;
    }

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--max-width);
    width: 100%;
    margin: 0 auto;
    z-index: 2;
    position: relative;
}

.logo {
    display: inline-flex;
    align-items: center;
    font-weight: 700;
    font-size: 1.15rem;
    letter-spacing: 0.04em;
    color: inherit;
}

    .logo img {
        display: block;
        height: 144px;
        width: auto;
    }

.nav-links {
    display: flex;
    gap: 24px;
    font-weight: 500;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}

    .nav-links a {
        position: relative;
        padding-bottom: 4px;
    }

        .nav-links a::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 0;
            height: 2px;
            background: var(--secondary);
            transition: width 0.3s ease;
        }

        .nav-links a:hover::after,
        .nav-links a:focus-visible::after {
            width: 100%;
        }

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px;
}

    .menu-toggle:focus-visible {
        outline: 3px solid var(--secondary);
        outline-offset: 2px;
        border-radius: 4px;
    }

    .menu-toggle span {
        width: 26px;
        height: 3px;
        background: var(--text);
        border-radius: 3px;
        transition: transform 0.3s ease;
    }

.hero-content {
    max-width: 720px;
    margin: 12vh auto 0;
    text-align: center;
    position: relative;
    z-index: 2;
}

.tagline {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 8px 16px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.12);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    font-size: 0.75rem;
}

.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4rem);
    margin-top: 24px;
    letter-spacing: -0.02em;
}

.hero .description {
    margin-top: 20px;
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.86);
}

.cta {
    display: inline-block;
    margin-top: 32px;
    padding: 14px 32px;
    border-radius: 999px;
    background: var(--secondary);
    color: #0b0312;
    font-weight: 600;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 18px 30px rgba(255, 112, 67, 0.35);
}

    .cta:hover {
        transform: translateY(-2px);
        box-shadow: 0 24px 36px rgba(255, 112, 67, 0.45);
    }

.section {
    padding: 96px 6vw;
    position: relative;
}

    .section::before {
        content: '';
        position: absolute;
        inset: 0;
        background: rgba(255, 255, 255, 0.02);
        opacity: 0;
        transition: opacity 0.5s ease;
        pointer-events: none;
    }

    .section:hover::before {
        opacity: 1;
    }

.section-header {
    max-width: 640px;
    margin: 0 auto 48px;
    text-align: center;
}

.community-actions {
    margin-top: 32px;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
}

    .community-actions .button {
        margin-top: 0;
    }

.button-secondary {
    background: transparent;
    border: 2px solid var(--secondary);
    color: var(--secondary);
}

    .button-secondary:hover {
        background: rgba(255, 112, 67, 0.1);
        color: var(--secondary);
    }

.subtitle {
    color: var(--secondary);
    font-weight: 600;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    font-size: 0.75rem;
}

.section h2 {
    font-size: clamp(2rem, 4vw, 2.8rem);
    margin-top: 14px;
}

.section p {
    color: var(--muted);
    margin-top: 14px;
}

.community {
    background: linear-gradient(150deg, rgba(103, 58, 183, 0.18), rgba(19, 19, 41, 0.92));
}

.community-grid {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    gap: 28px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

@media (max-width: 900px) {
    .community-grid {
        grid-template-columns: 1fr;
    }
}

.community-card {
    padding: 32px;
    border-radius: 24px;
    background: rgba(12, 12, 28, 0.85);
    border: 1px solid rgba(255, 255, 255, 0.06);
    box-shadow: var(--shadow);
    display: grid;
    gap: 16px;
}

    .community-card h3 {
        font-size: 1.3rem;
    }

.event-overview {
    background: linear-gradient(160deg, rgba(19, 19, 41, 0.9), rgba(103, 58, 183, 0.15));
}

.event-grid {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    gap: 28px;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.event-card {
    padding: 32px;
    border-radius: 24px;
    background: linear-gradient(135deg, rgba(19, 19, 41, 0.78), rgba(19, 19, 41, 0.5));
    border: 1px solid rgba(255, 255, 255, 0.06);
    box-shadow: var(--shadow);
    display: grid;
    gap: 18px;
}

    .event-card h3 {
        font-size: 1.4rem;
    }

    .event-card ul {
        display: grid;
        gap: 12px;
    }

    .event-card li {
        position: relative;
        padding-left: 26px;
        color: var(--muted);
    }

        .event-card li::before {
            content: '';
            position: absolute;
            top: 8px;
            left: 0;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--secondary);
            box-shadow: 0 0 0 4px rgba(255, 112, 67, 0.18);
        }

.tickets .ticket-card,
.sponsor-benefit,
.speaker-card,
.organizer-card,
.sponsor-tier,
.agenda-list li,
.location-details {
    background: linear-gradient(135deg, rgba(19, 19, 41, 0.75), rgba(19, 19, 41, 0.45));
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    padding: 32px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(12px);
}

.organizer-grid {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    gap: 32px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

@media (max-width: 900px) {
    .organizer-grid {
        grid-template-columns: 1fr;
    }
}

.organizer-card {
    background: linear-gradient(135deg, rgba(19, 19, 41, 0.85), rgba(39, 19, 64, 0.6));
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 24px;
    padding: 32px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(12px);
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 24px;
    align-items: start;
    text-align: left;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    position: relative;
    overflow: hidden;
}

    .organizer-card::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 4px;
        background: linear-gradient(90deg, var(--primary), var(--secondary));
        opacity: 0;
        transition: opacity 0.3s ease;
    }

    .organizer-card:hover {
        transform: translateY(-8px);
        box-shadow: 0 32px 48px rgba(22, 17, 45, 0.5);
        border-color: rgba(255, 112, 67, 0.3);
    }

        .organizer-card:hover::before {
            opacity: 1;
        }

.organizer-photo {
    width: 120px;
    height: 120px;
    border-radius: 20px;
    object-fit: cover;
    box-shadow: 0 20px 30px rgba(0, 0, 0, 0.4);
    border: 3px solid rgba(255, 255, 255, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.organizer-card:hover .organizer-photo {
    transform: scale(1.05);
    box-shadow: 0 25px 40px rgba(0, 0, 0, 0.5);
}

.organizer-card h3 {
    font-size: 1.5rem;
    margin-bottom: 8px;
    font-weight: 700;
    color: var(--text);
}

.organizer-role {
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: 16px;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.organizer-card p {
    color: var(--muted);
    line-height: 1.6;
    font-size: 0.95rem;
}

.organizer-tags {
    margin-top: 20px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

    .organizer-tags li {
        padding: 6px 14px;
        border-radius: 999px;
        background: rgba(255, 255, 255, 0.08);
        font-size: 0.85rem;
        letter-spacing: 0.02em;
    }

.sponsor-list {
    max-width: var(--max-width);
    margin: 0 auto 48px;
    display: grid;
    gap: 24px;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.sponsor-card {
    padding: 40px 32px;
    border-radius: 20px;
    background: linear-gradient(135deg, rgba(19, 19, 41, 0.88), rgba(19, 19, 41, 0.55));
    border: 1px solid rgba(255, 255, 255, 0.08);
    display: grid;
    gap: 12px;
    justify-items: center;
    text-align: center;
    box-shadow: var(--shadow);
}

    .sponsor-card p {
        font-size: 1.3rem;
        font-weight: 600;
    }

    .sponsor-card span {
        color: var(--muted);
    }

.sponsor-card--placeholder {
    border-style: dashed;
    border-color: rgba(255, 255, 255, 0.22);
    background: rgba(19, 19, 41, 0.6);
}

.ticket-card {
    max-width: 420px;
    margin: 0 auto;
    text-align: center;
}

    .ticket-card h3 {
        font-size: 1.5rem;
        margin-bottom: 12px;
    }

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-top: 24px;
    padding: 12px 28px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 600;
    transition: transform 0.3s ease, background 0.3s ease;
}

    .button:hover {
        background: var(--primary-dark);
        transform: translateY(-2px);
    }

.event-actions {
    display: flex;
    justify-content: center;
    margin-top: 24px;
}

    .event-actions .button {
        margin-top: 0;
    }

.sponsor-invite {
    max-width: 720px;
    margin: 0 auto;
    text-align: center;
    padding: 48px;
    border-radius: 24px;
    background: var(--surface);
    box-shadow: var(--shadow);
}

    .sponsor-invite p {
        font-size: 1.1rem;
        color: var(--muted);
    }

    .sponsor-invite .button {
        margin-top: 32px;
    }

.sponsor-tiers {
    max-width: var(--max-width);
    margin: 0 auto 48px;
    display: grid;
    gap: 24px;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.sponsor-tier {
    position: relative;
    padding-top: 48px;
    min-height: 280px;
}

    .sponsor-tier h3 {
        font-size: 1.35rem;
        margin-bottom: 12px;
    }

.tier-label {
    position: absolute;
    top: 24px;
    left: 32px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    border-radius: 999px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    font-size: 0.75rem;
    background: rgba(255, 255, 255, 0.1);
}

.tier-placeholder {
    margin-top: 28px;
    padding: 14px;
    border-radius: 14px;
    text-align: center;
    background: rgba(255, 255, 255, 0.06);
    color: var(--muted);
    font-weight: 600;
}

.sponsor-tier--gold {
    border: 1px solid rgba(255, 215, 0, 0.3);
    box-shadow: 0 25px 40px rgba(255, 215, 0, 0.12);
}

    .sponsor-tier--gold .tier-label {
        background: rgba(255, 215, 0, 0.18);
        color: #ffe082;
    }

.sponsor-tier--silver {
    border: 1px solid rgba(192, 192, 192, 0.35);
    box-shadow: 0 25px 40px rgba(192, 192, 192, 0.15);
}

    .sponsor-tier--silver .tier-label {
        background: rgba(224, 224, 224, 0.16);
        color: #f5f5f5;
    }

.sponsor-tier--community {
    border: 1px solid rgba(103, 58, 183, 0.35);
    box-shadow: 0 25px 40px rgba(103, 58, 183, 0.18);
}

    .sponsor-tier--community .tier-label {
        background: rgba(103, 58, 183, 0.28);
        color: #d1c4e9;
    }

.sponsor-benefits {
    max-width: var(--max-width);
    margin: 0 auto 64px;
    display: grid;
    gap: 24px;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.sponsor-benefit h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
}

.sponsor-benefit p {
    color: var(--muted);
}

.sponsor-cta {
    max-width: 540px;
    margin: 0 auto;
    text-align: center;
}

    .sponsor-cta p {
        margin-top: 16px;
        color: var(--muted);
    }

.subpage-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 32px 6vw 0;
    max-width: var(--max-width);
    margin: 0 auto;
}

    .subpage-header .logo {
        font-weight: 700;
        letter-spacing: 0.04em;
    }

.year-selector {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 40px;
}

.year-button {
    padding: 10px 22px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.25);
    background: transparent;
    color: var(--text);
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s ease, color 0.3s ease, transform 0.3s ease;
}

    .year-button:focus-visible {
        outline: 3px solid var(--secondary);
        outline-offset: 2px;
    }

    .year-button.active,
    .year-button:hover {
        background: var(--secondary);
        color: #0b0312;
        transform: translateY(-2px);
    }

.speakers-wrapper {
    max-width: var(--max-width);
    margin: 0 auto;
}

.speaker-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 28px;
}

.speaker-card {
    text-align: center;
    padding: 36px 24px;
    position: relative;
    overflow: hidden;
}

    .speaker-card::before {
        content: '';
        position: absolute;
        inset: 0;
        background: linear-gradient(180deg, rgba(103, 58, 183, 0.35), transparent 60%);
        opacity: 0;
        transition: opacity 0.3s ease;
    }

    .speaker-card:hover::before {
        opacity: 1;
    }

.avatar {
    width: 70px;
    height: 70px;
    margin: 0 auto 18px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.12);
    font-weight: 700;
    letter-spacing: 0.05em;
}

.agenda-wrapper {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    gap: 32px;
}

.agenda-day h3 {
    font-size: 1.6rem;
    margin-bottom: 24px;
}

.agenda-list {
    display: grid;
    gap: 18px;
}

    .agenda-list li {
        display: grid;
        grid-template-columns: 90px 1fr;
        gap: 24px;
        align-items: center;
    }

.time {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--secondary);
}

.meetups {
    background: linear-gradient(145deg, rgba(103, 58, 183, 0.3), rgba(19, 19, 41, 0.95));
}

.meetups-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 28px;
    max-width: var(--max-width);
    margin: 0 auto;
}

.meetup-card {
    padding: 32px;
    border-radius: 24px;
    background: rgba(12, 12, 28, 0.85);
    border: 1px solid rgba(255, 255, 255, 0.06);
    box-shadow: var(--shadow);
    display: grid;
    gap: 16px;
}

    .meetup-card h3 {
        font-size: 1.2rem;
    }

    .meetup-card p {
        color: var(--muted);
    }

.meetups-cta {
    margin: 48px auto 0;
    max-width: 540px;
    text-align: center;
    display: grid;
    gap: 14px;
}

    .meetups-cta .button {
        justify-self: center;
    }

.meetups-program {
    background: linear-gradient(145deg, rgba(39, 19, 64, 0.9), rgba(12, 12, 28, 0.95));
}

.meetup-schedule {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    gap: 24px;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.meetup-highlight {
    padding: 32px;
    border-radius: 24px;
    background: linear-gradient(135deg, rgba(26, 26, 54, 0.85), rgba(39, 19, 64, 0.7));
    border: 1px solid rgba(255, 255, 255, 0.06);
    box-shadow: var(--shadow);
    display: grid;
    gap: 14px;
}

.meetup-date {
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--secondary);
}

.meetups-community {
    background: linear-gradient(145deg, rgba(12, 12, 28, 0.96), rgba(103, 58, 183, 0.25));
}

.meetups-community-grid {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    gap: 24px;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.location-grid {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    gap: 32px;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    align-items: stretch;
}

.location-details ul {
    margin-top: 20px;
    display: grid;
    gap: 10px;
    color: var(--muted);
}

.map-container iframe {
    width: 100%;
    min-height: 340px;
    border: none;
    border-radius: 20px;
    box-shadow: var(--shadow);
}

.agenda-placeholder {
    padding: 40px;
    text-align: center;
    color: var(--muted);
}

    .agenda-placeholder h3 {
        margin-bottom: 16px;
        color: var(--text);
    }

.footer {
    padding: 32px 6vw;
    text-align: center;
    background: rgba(10, 10, 24, 0.9);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--muted);
}

.hidden {
    display: none !important;
}

/* Mejora para reducir movimiento en dispositivos con preferencia */
@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;
    }
}

@media (max-width: 900px) {
    .navbar {
        position: relative;
    }

    .menu-toggle {
        display: flex;
    }

    /* Mobile: align dropdown under the hamburger button and cancel desktop centering transform */
    .nav-links {
        position: absolute;
        top: calc(100% + 12px);
        right: 16px;
        left: auto;
        transform: none;
        flex-direction: column;
        background: rgba(10, 10, 24, 0.98);
        padding: 16px 20px;
        border-radius: 12px;
        box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
        display: none;
        min-width: 180px;
        z-index: 99999; /* ensure menu overlays hero and other elements */
        backdrop-filter: blur(8px);
    }

    /* Mobile menu backdrop overlay */
    .nav-menu-backdrop {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.2);
        z-index: 99998;
        display: none;
    }

        .nav-menu-backdrop.open {
            display: block;
        }

    .nav-links.open {
        display: flex;
    }

    /* Fallback: mostrar menú si JavaScript no funciona en móvil */
    @supports not (display: flex) {
        .nav-links {
            display: block;
        }
    }

    .hero-content {
        margin-top: 16vh;
    }

    .community-grid,
    .event-grid {
        grid-template-columns: 1fr;
    }

    .agenda-list li {
        grid-template-columns: 1fr;
        text-align: left;
    }

    .meetups-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    .hero {
        padding-top: 24px;
    }

    .hero-content {
        margin-top: 20vh;
    }

    .tagline {
        font-size: 0.7rem;
        letter-spacing: 0.15em;
    }

    .logo img {
        height: 104px;
    }

    .section {
        padding: 72px 6vw;
    }

    .ticket-card,
    .speaker-card,
    .agenda-list li,
    .location-details {
        padding: 24px;
    }
}

/* Botón volver arriba */
.back-to-top {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--primary);
    border: none;
    color: white;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 8px 24px rgba(103, 58, 183, 0.4);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

    .back-to-top:hover {
        background: var(--primary-dark);
        transform: translateY(-2px);
        box-shadow: 0 12px 32px rgba(103, 58, 183, 0.5);
    }

    .back-to-top:focus-visible {
        outline: 3px solid var(--secondary);
        outline-offset: 2px;
    }

    .back-to-top.visible {
        opacity: 1;
        visibility: visible;
    }

    .back-to-top svg {
        transition: transform 0.3s ease;
    }

    .back-to-top:hover svg {
        transform: translateY(-2px);
    }

/* Responsive para móvil */
@media (max-width: 768px) {
    .back-to-top {
        bottom: 16px;
        right: 16px;
        width: 48px;
        height: 48px;
    }

        .back-to-top svg {
            width: 20px;
            height: 20px;
        }
}