/* ================================================
   TIMELINE STYLES
   Interactive vertical timeline for About page
   Images positioned in whitespace opposite cards
   ================================================ */

/* Timeline Container */
.timeline-content {
    max-width: 1200px;
    padding: 2rem 0 4rem;
}

.timeline-header {
    text-align: center;
    margin-bottom: 4rem;
}

.timeline-intro {
    font-size: 1.25rem;
    color: #A0AEC0;
    max-width: 700px;
    margin: 1.5rem auto 0;
    line-height: 1.7;
}

/* Timeline Section */
.timeline {
    position: relative;
    padding: 2rem 0;
    margin: 0 auto;
}

/* Timeline Center Line */
.timeline-line {
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(
        to bottom,
        rgba(255, 107, 157, 0.2),
        rgba(78, 205, 196, 0.4),
        rgba(167, 139, 250, 0.4),
        rgba(255, 107, 157, 0.2)
    );
    transform: translateX(-50%);
    z-index: 0;
    box-shadow: 0 0 20px rgba(255, 107, 157, 0.3);
}

/* Timeline Item Container */
.timeline-item {
    position: relative;
    margin-bottom: 5rem;
    opacity: 0;
    transition: opacity 0.8s ease, transform 0.8s ease;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

/* Left positioned items - card on left, image on right */
.timeline-item-left {
    transform: translateX(-50px);
}

.timeline-item-left .timeline-card {
    grid-column: 1;
    grid-row: 1;
}

.timeline-item-left .timeline-image {
    grid-column: 2;
    grid-row: 1;
}

/* Right positioned items - image on left, card on right */
.timeline-item-right {
    transform: translateX(50px);
}

.timeline-item-right .timeline-image {
    grid-column: 1;
    grid-row: 1;
}

.timeline-item-right .timeline-card {
    grid-column: 2;
    grid-row: 1;
}

/* Visible state (animated in) */
.timeline-item-visible {
    opacity: 1;
    transform: translateX(0);
}

/* Timeline Dot (connects to center line) */
.timeline-dot {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border: 4px solid var(--bg-dark);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    z-index: 2;
    box-shadow: 0 0 0 4px rgba(255, 107, 157, 0.2),
                0 0 20px rgba(255, 107, 157, 0.5);
    transition: all 0.3s ease;
}

.timeline-item:hover .timeline-dot {
    transform: translate(-50%, -50%) scale(1.3);
    box-shadow: 0 0 0 6px rgba(255, 107, 157, 0.3),
                0 0 30px rgba(255, 107, 157, 0.7);
}

/* Timeline Card */
.timeline-card {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    position: relative;
    z-index: 1;
}

.timeline-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255, 107, 157, 0.05), rgba(78, 205, 196, 0.05));
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.timeline-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 12px 40px rgba(255, 107, 157, 0.4);
    border-color: var(--primary-color);
}

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

/* Card Content */
.timeline-card-content {
    padding: 2.5rem;
    position: relative;
    z-index: 1;
}

.timeline-card-title {
    font-size: 1.75rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
}

.timeline-card-text {
    font-size: 1.125rem;
    line-height: 1.8;
    color: #CBD5E0;
    margin-bottom: 0;
}

/* Timeline Image - positioned opposite the card */
.timeline-image {
    width: 100%;
    height: 350px;
    border-radius: 16px;
    overflow: hidden;
    background: linear-gradient(135deg, rgba(255, 107, 157, 0.1), rgba(78, 205, 196, 0.1));
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    border: 2px solid var(--border-color);
    transition: all 0.4s ease;
    position: relative;
}

.timeline-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255, 107, 157, 0.1), rgba(78, 205, 196, 0.1));
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
    z-index: 1;
}

.timeline-image:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 30px rgba(255, 107, 157, 0.4);
    border-color: var(--primary-color);
}

.timeline-image:hover::before {
    opacity: 1;
}

.timeline-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.timeline-image:hover img {
    transform: scale(1.1);
}

/* CTA Card Buttons */
.timeline-card-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.timeline-card-cta .timeline-card-content {
    padding-bottom: 2.5rem;
}

/* Focus states for accessibility */
.timeline-card:focus-within {
    outline: 3px solid var(--primary-color);
    outline-offset: 4px;
}

.timeline-image:focus-within {
    outline: 3px solid var(--secondary-color);
    outline-offset: 4px;
}

.btn:focus {
    outline: 3px solid var(--accent-color);
    outline-offset: 2px;
}

/* ================================================
   RESPONSIVE DESIGN
   ================================================ */

/* Tablet and below */
@media (max-width: 768px) {
    .timeline-content {
        padding: 1.5rem 0 3rem;
    }

    .timeline-header {
        margin-bottom: 3rem;
    }

    .timeline-intro {
        font-size: 1.125rem;
        padding: 0 1rem;
    }

    /* Move timeline line to left side */
    .timeline-line {
        left: 30px;
    }

    /* Stack all cards and images vertically */
    .timeline-item {
        display: block;
        padding-left: 80px;
        padding-right: 0;
        transform: translateX(-30px);
    }

    .timeline-item-left,
    .timeline-item-right {
        transform: translateX(-30px);
    }

    .timeline-item-visible {
        transform: translateX(0);
    }

    /* Reset grid positioning for mobile */
    .timeline-item-left .timeline-card,
    .timeline-item-left .timeline-image,
    .timeline-item-right .timeline-card,
    .timeline-item-right .timeline-image {
        grid-column: auto;
        grid-row: auto;
    }

    /* Image above card on mobile */
    .timeline-image {
        height: 250px;
        margin-bottom: 1.5rem;
    }

    /* Adjust dot position for left-aligned timeline */
    .timeline-dot {
        left: 30px;
    }

    .timeline-card-content {
        padding: 1.5rem;
    }

    .timeline-card-title {
        font-size: 1.5rem;
    }

    .timeline-card-text {
        font-size: 1rem;
    }

    .timeline-card-buttons {
        flex-direction: column;
    }

    .timeline-card-buttons .btn {
        width: 100%;
        text-align: center;
    }
}

/* Mobile */
@media (max-width: 480px) {
    .timeline-content {
        padding: 1rem 0 2rem;
    }

    .timeline-header {
        margin-bottom: 2rem;
    }

    .timeline-intro {
        font-size: 1rem;
    }

    .timeline-item {
        margin-bottom: 3rem;
        padding-left: 60px;
    }

    .timeline-line {
        left: 20px;
        width: 2px;
    }

    .timeline-dot {
        left: 20px;
        width: 16px;
        height: 16px;
        border-width: 3px;
    }

    .timeline-image {
        height: 200px;
        margin-bottom: 1rem;
    }

    .timeline-card-content {
        padding: 1.25rem;
    }

    .timeline-card-title {
        font-size: 1.375rem;
    }

    .timeline-card-text {
        font-size: 0.95rem;
        line-height: 1.7;
    }

    .timeline-card-buttons {
        margin-top: 1.5rem;
    }
}

/* Extra small devices */
@media (max-width: 360px) {
    .timeline-item {
        padding-left: 50px;
    }

    .timeline-line {
        left: 15px;
    }

    .timeline-dot {
        left: 15px;
        width: 14px;
        height: 14px;
    }

    .timeline-image {
        height: 180px;
    }

    .timeline-card-content {
        padding: 1rem;
    }
}

/* ================================================
   ACCESSIBILITY: REDUCED MOTION
   ================================================ */

@media (prefers-reduced-motion: reduce) {
    .timeline-item,
    .timeline-card,
    .timeline-dot,
    .timeline-image,
    .timeline-image img {
        transition: none !important;
        animation: none !important;
    }

    /* Show all items immediately */
    .timeline-item {
        opacity: 1;
        transform: none;
    }

    .timeline-item-left,
    .timeline-item-right {
        transform: none;
    }
}

/* ================================================
   PRINT STYLES
   ================================================ */

@media print {
    .timeline-line {
        background: #333;
    }

    .timeline-dot {
        background: #333;
        border-color: #fff;
        box-shadow: none;
    }

    .timeline-card,
    .timeline-image {
        page-break-inside: avoid;
        box-shadow: none;
        border: 1px solid #333;
    }

    .timeline-item {
        opacity: 1;
        transform: none;
        margin-bottom: 2rem;
    }
}