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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 40px 20px;
}

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

header {
    text-align: center;
    color: white;
    margin-bottom: 60px;
    animation: slideDown 0.8s ease-out;
}

header h1 {
    font-size: 3em;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.subtitle {
    font-size: 1.2em;
    opacity: 0.9;
    letter-spacing: 0.5px;
}

/* Timeline Container */
.timeline {
    position: relative;
    padding: 40px 0;
    max-width: 900px;
    margin: 0 auto;
}

.timeline-line {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 4px;
    background: rgba(255, 255, 255, 0.3);
    transform: translateX(-50%);
    z-index: 1;
}

.timeline-items {
    display: flex;
    flex-direction: column;
    position: relative;
    z-index: 2;
}

/* Individual Timeline Item */
.timeline-item {
    display: flex;
    margin-bottom: 50px;
    position: relative;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

.timeline-item:nth-child(1) { animation-delay: 0.1s; }
.timeline-item:nth-child(2) { animation-delay: 0.2s; }
.timeline-item:nth-child(3) { animation-delay: 0.3s; }
.timeline-item:nth-child(4) { animation-delay: 0.4s; }
.timeline-item:nth-child(5) { animation-delay: 0.5s; }
.timeline-item:nth-child(6) { animation-delay: 0.6s; }
.timeline-item:nth-child(7) { animation-delay: 0.7s; }
.timeline-item:nth-child(8) { animation-delay: 0.8s; }
.timeline-item:nth-child(9) { animation-delay: 0.9s; }
.timeline-item:nth-child(10) { animation-delay: 1s; }
.timeline-item:nth-child(11) { animation-delay: 1.1s; }
.timeline-item:nth-child(12) { animation-delay: 1.2s; }
.timeline-item:nth-child(13) { animation-delay: 1.3s; }

/* Alternancia izquierda y derecha */
.timeline-item:nth-child(odd) {
    flex-direction: row;
    justify-content: flex-end;
}

.timeline-item:nth-child(even) {
    flex-direction: row-reverse;
    justify-content: flex-end;
}

/* Items de lado izquierdo */
.timeline-item:nth-child(odd) {
    animation: slideInLeft 0.6s ease-out forwards;
}

.timeline-item:nth-child(odd).visible {
    animation: slideInLeft 0.6s ease-out forwards;
}

/* Items de lado derecho */
.timeline-item:nth-child(even) {
    animation: slideInRight 0.6s ease-out forwards;
}

.timeline-item:nth-child(even).visible {
    animation: slideInRight 0.6s ease-out forwards;
}

/* Punto en la línea */
.timeline-point {
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    position: absolute;
    left: 50%;
    top: 30px;
    transform: translateX(-50%) scale(0);
    z-index: 5;
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.8);
    animation: pulse 2s infinite;
    transition: transform 0.6s ease-out;
}

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

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.8);
    }
    50% {
        box-shadow: 0 0 0 8px rgba(102, 126, 234, 0.3);
    }
}

.timeline-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 45%;
    padding: 0 30px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 20px 30px;
    backdrop-filter: blur(10px);
    opacity: 0;
    transform: scale(0.95) rotateY(5deg);
    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) rotateY(0deg);
}

.timeline-date {
    margin-top: 12px;
    color: white;
    font-size: 0.85em;
    font-weight: 600;
    text-align: center;
    background: rgba(255, 255, 255, 0.1);
    padding: 6px 12px;
    border-radius: 20px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.6s ease-out 0.4s, transform 0.6s ease-out 0.4s;
}

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

/* 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: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
    filter: drop-shadow(0 4px 15px rgba(0, 0, 0, 0.2));
}

.timeline-image-wrapper img:hover {
    transform: scale(1.15) rotateZ(5deg);
    filter: drop-shadow(0 8px 25px rgba(0, 0, 0, 0.4));
}

/* Tooltip */
.tooltip {
    position: absolute;
    bottom: 120px;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    background: white;
    padding: 14px;
    border-radius: 12px;
    width: 200px;
    max-height: 300px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 10;
    text-align: center;
    pointer-events: none;
    overflow-y: auto;
}

.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: #667eea;
    font-size: 1em;
    margin-bottom: 4px;
}

.tooltip p {
    color: #333;
    font-size: 0.85em;
    margin-bottom: 6px;
    line-height: 1.3;
}

.tooltip p:last-of-type {
    margin-bottom: 0;
}

.tooltip-list {
    list-style: none;
    margin: 8px 0;
    text-align: left;
}

.tooltip-list li {
    color: #333;
    font-size: 0.8em;
    margin: 4px 0;
    padding-left: 12px;
    position: relative;
    line-height: 1.2;
}

.tooltip-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #667eea;
    font-weight: bold;
}

.tooltip .year {
    display: block;
    color: #764ba2;
    font-weight: bold;
    font-size: 0.8em;
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid #eee;
}

/* Footer */
footer {
    text-align: center;
    color: white;
    margin-top: 60px;
    font-size: 1.1em;
    opacity: 0.9;
    animation: slideUp 0.8s ease-out;
    display: flex;
    flex-direction: column;
    gap: 20px;
    align-items: center;
}

.btn-ios {
    display: inline-block;
    padding: 12px 30px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-decoration: none;
    border-radius: 25px;
    font-weight: 600;
    font-size: 1em;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
    border: 2px solid transparent;
}

.btn-ios:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.6);
    border-color: white;
}

/* Animaciones */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px) skewX(-5deg);
    }
    to {
        opacity: 1;
        transform: translateX(0) skewX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px) skewX(5deg);
    }
    to {
        opacity: 1;
        transform: translateX(0) skewX(0);
    }
}

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

    .timeline-item {
        width: 100%;
    }

    .timeline-content {
        width: 100%;
        padding: 15px 20px;
    }
}

@media (max-width: 768px) {
    .timeline-image-wrapper {
        width: 60px;
        height: 60px;
    }

    .tooltip {
        width: 160px;
        padding: 10px;
        bottom: 90px;
    }

    .tooltip h3 {
        font-size: 0.9em;
    }

    .tooltip p {
        font-size: 0.8em;
    }

    .tooltip-list li {
        font-size: 0.7em;
        margin: 2px 0;
    }

    header h1 {
        font-size: 1.8em;
    }

    .subtitle {
        font-size: 1em;
    }

    .timeline-content {
        width: 90%;
        padding: 12px 15px;
    }

    .timeline-date {
        font-size: 0.8em;
        padding: 4px 8px;
    }

    .timeline-item {
        margin-bottom: 40px;
    }
}

@media (max-width: 480px) {
    body {
        padding: 20px 10px;
    }

    header h1 {
        font-size: 1.3em;
    }

    .subtitle {
        font-size: 0.9em;
    }

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

    .timeline-item {
        margin: 25px 0;
    }

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

    .tooltip {
        width: 150px;
        bottom: 90px;
        padding: 8px;
        font-size: 0.8em;
    }

    .tooltip h3 {
        font-size: 0.8em;
        margin-bottom: 2px;
    }

    .tooltip p {
        font-size: 0.7em;
        margin-bottom: 4px;
    }

    .tooltip-list li {
        font-size: 0.7em;
        margin: 2px 0;
        padding-left: 10px;
    }

    .timeline-date {
        font-size: 0.75em;
        padding: 3px 6px;
        margin-top: 6px;
    }

    footer {
        font-size: 0.85em;
    }
}