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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', sans-serif;
    background: #f5f5f7;
    min-height: 100vh;
    padding: 80px 20px;
    color: #1d1d1f;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 80px;
    animation: slideDown 0.8s ease-out;
}

header h1 {
    font-size: 2.8em;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.5px;
    color: #1d1d1f;
}

.subtitle {
    font-size: 1.1em;
    color: #666;
    font-weight: 400;
    letter-spacing: 0;
}

/* Timeline Container */
.timeline {
    position: relative;
    padding: 60px 0;
}

.timeline-line {
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: #d2d2d7;
    transform: translateY(-50%);
    z-index: 1;
}

.timeline-items {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    position: relative;
    z-index: 2;
    gap: 20px;
}

/* Individual Timeline Item */
.timeline-item {
    flex: 1;
    min-width: 120px;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

.timeline-item:nth-child(1) { transition-delay: 0.1s; }
.timeline-item:nth-child(2) { transition-delay: 0.2s; }
.timeline-item:nth-child(3) { transition-delay: 0.3s; }
.timeline-item:nth-child(4) { transition-delay: 0.4s; }
.timeline-item:nth-child(5) { transition-delay: 0.5s; }
.timeline-item:nth-child(6) { transition-delay: 0.6s; }

/* Punto en la línea */
.timeline-point {
    width: 14px;
    height: 14px;
    background: white;
    border-radius: 50%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    z-index: 5;
    border: 2px solid #0071e3;
    box-shadow: 0 0 0 1px #f5f5f7;
    transition: transform 0.6s ease-out;
}

.timeline-item.visible .timeline-point {
    transform: translate(-50%, -50%) scale(1);
}

.timeline-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    margin-top: 40px;
    opacity: 0;
    transform: scale(0.95);
    transition: opacity 0.6s ease-out 0.2s, transform 0.6s ease-out 0.2s;
}

.timeline-item.visible .timeline-content {
    opacity: 1;
    transform: scale(1);
}

/* Imagen y Tooltip */
.timeline-image-wrapper {
    position: relative;
    width: 100px;
    height: 100px;
    margin-bottom: 20px;
    opacity: 0;
    transform: scale(0.8);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.timeline-item.visible .timeline-image-wrapper {
    opacity: 1;
    transform: scale(1);
}

.timeline-image-wrapper img {
    width: 100%;
    height: 100%;
    border-radius: 22px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.2, 0, 0.2, 1);
    filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.08));
    padding: 12px;
    background: white;
}

.timeline-image-wrapper img:hover {
    transform: scale(1.08) translateY(-4px);
    filter: drop-shadow(0 8px 20px rgba(0, 0, 0, 0.12));
}

/* Tooltip */
.tooltip {
    position: absolute;
    bottom: 120px;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    background: white;
    padding: 18px 16px;
    border-radius: 12px;
    width: 220px;
    max-height: 320px;
    box-shadow: 0 8px 28px rgba(0, 0, 0, 0.1);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.2, 0, 0.2, 1);
    z-index: 10;
    text-align: center;
    pointer-events: none;
    overflow-y: auto;
    border: 1px solid #e5e5ea;
}

.tooltip::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-top: 8px solid white;
}

.timeline-image-wrapper:hover .tooltip {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.tooltip h3 {
    color: #0071e3;
    font-size: 0.95em;
    margin-bottom: 6px;
    font-weight: 600;
    letter-spacing: -0.3px;
}

.tooltip p {
    color: #1d1d1f;
    font-size: 0.85em;
    margin-bottom: 8px;
    line-height: 1.4;
    font-weight: 500;
}

.tooltip-list {
    list-style: none;
    margin: 10px 0;
    text-align: left;
}

.tooltip-list li {
    color: #424245;
    font-size: 0.78em;
    margin: 5px 0;
    padding-left: 14px;
    position: relative;
    line-height: 1.3;
}

.tooltip-list li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: #0071e3;
    font-weight: bold;
}

.tooltip .year {
    display: block;
    color: #0071e3;
    font-weight: 600;
    font-size: 0.78em;
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid #f5f5f7;
}

.timeline-date {
    margin-top: 14px;
    color: #666;
    font-size: 0.82em;
    font-weight: 500;
    text-align: center;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.6s ease-out 0.4s, transform 0.6s ease-out 0.4s;
    letter-spacing: -0.2px;
}

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

/* Footer */
footer {
    text-align: center;
    color: #1d1d1f;
    margin-top: 80px;
    font-size: 1em;
    animation: slideUp 0.8s ease-out;
    display: flex;
    flex-direction: column;
    gap: 20px;
    align-items: center;
}

.btn-android {
    display: inline-block;
    padding: 12px 28px;
    background: #0071e3;
    color: white;
    text-decoration: none;
    border-radius: 980px;
    font-weight: 500;
    font-size: 0.95em;
    transition: all 0.3s cubic-bezier(0.2, 0, 0.2, 1);
    box-shadow: none;
    border: none;
    cursor: pointer;
    letter-spacing: -0.3px;
}

.btn-android:hover {
    background: #0077ed;
    transform: translateY(-2px);
}

.btn-android:active {
    transform: translateY(0);
}

/* Animaciones */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .timeline-items {
        flex-direction: column;
        align-items: center;
    }

    .timeline-line {
        width: 1px;
        left: 50%;
        top: 0;
        bottom: 0;
        transform: translateX(-50%);
        height: auto;
    }

    .timeline-item {
        width: 100%;
        margin: 40px 0;
    }

    .timeline-point {
        left: 0;
    }

    .timeline-content {
        padding-left: 60px;
    }

    header h1 {
        font-size: 2em;
    }
}

@media (max-width: 768px) {
    body {
        padding: 60px 16px;
    }

    .timeline-image-wrapper {
        width: 70px;
        height: 70px;
    }

    .tooltip {
        width: 180px;
        padding: 14px;
        bottom: 90px;
    }

    header h1 {
        font-size: 1.6em;
    }

    .subtitle {
        font-size: 1em;
    }

    .timeline-content {
        padding-left: 50px;
    }
}

@media (max-width: 480px) {
    body {
        padding: 40px 12px;
    }

    header h1 {
        font-size: 1.4em;
    }

    .timeline-image-wrapper {
        width: 60px;
        height: 60px;
    }

    .timeline-item {
        margin: 30px 0;
    }

    .tooltip {
        width: 160px;
        bottom: 100px;
        font-size: 0.9em;
    }

    footer {
        font-size: 0.95em;
    }
}