.protocols {
    background: var(--callout-bg);
    max-width: 1240px;
    border-radius: var(--radius-lg);
    padding-top: 120px;
    margin: 0 auto;
}

.protocols__wrapper {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
    align-items: center;
}

/* ============================================
   TEXT SECTION
   ============================================ */

.protocols__text {
    max-width: 1000px;
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    text-align: center;
}

.protocols__title {
    font-size: var(--fs-xxl);
    font-weight: 600;
    line-height: 1.2;
    margin: 0;
    color: var(--text-primary);
}

.protocols__title-accent {
    color: var(--accent-primary);
}

.protocols__subtitle {
    font-size: var(--fs-sm);
    font-weight: 400;
    line-height: 1.5;
    margin: 0;
    color: var(--text-secondary);
}

/* ============================================
   PROTOCOL LIST SECTION (Marquee)
   ============================================ */

.protocols__list {
    max-width: 1135px;
    width: 100%;
    padding: 32px 0;
    overflow: hidden; /* Clip content */
    position: relative;
}

.protocols__list-track {
    display: flex;
    gap: var(--space-2);
    flex-wrap: nowrap;
    animation: protocols-marquee 25s linear infinite;
    will-change: transform;
}

/* Pause animation on hover for accessibility */
.protocols__list-track:hover {
    animation-play-state: paused;
}

/* Duplicate cards - hide in no-motion mode */
@media (prefers-reduced-motion: reduce) {
    .protocols__list-track {
        animation: none;
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .protocols__card--duplicate {
        display: none;
    }
}

/* Marquee animation */
@keyframes protocols-marquee {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(calc(-300px * 5 - var(--space-2) * 5));
    }
}

/* ============================================
   PROTOCOL CARDS
   ============================================ */

.protocols__card {
    background: var(--callout-card-bg);
    width: 300px;
    min-width: 300px;
    height: 120px;
    padding: 12px 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    flex-shrink: 0;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.protocols__card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.protocols__card:focus-within {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

.protocols__card-text {
    font-size: var(--fs-lg);
    font-weight: 500;
    letter-spacing: -0.005em;
    color: var(--text-primary);
    margin: 0;
}

/* ============================================
   KEYNOTE SECTION
   ============================================ */

.protocols__keynote {
    width: 100%;
    display: flex;
    gap: var(--space-3);
    justify-content: center;
    flex-wrap: wrap;
    padding-bottom: 40px;
}

.protocols__keynote-card {
    background: var(--callout-card-bg);
    max-width: 315px;
    flex: 1 1 315px;
    height: 350px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 32px;
    border-radius: var(--radius-md);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.protocols__keynote-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.protocols__keynote-card:focus-within {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

.protocols__keynote-icon {
    width: 96px;
    height: 96px;
    display: block;
    flex-shrink: 0;
}

.protocols__keynote-text {
    display: flex;
    flex-direction: column;
    gap: 12px;
    flex: 1;
}

.protocols__keynote-header {
    font-size: var(--fs-md);
    font-weight: 500;
    color: var(--text-primary);
    margin: 0;
    line-height: 1.3;
}

.protocols__keynote-caption {
    font-size: var(--fs-sm);
    font-weight: 400;
    color: var(--text-primary);
    margin: 0;
    line-height: 1.5;
}

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

/* Mobile: < 640px */
@media (max-width: 639px) {
    .protocols {
        padding-top: 60px;
    }

    .protocols__wrapper {
        gap: var(--space-3);
    }

    .protocols__text {
        padding: 0 var(--space-2);
    }

    .protocols__title {
        font-size: 32px;
    }

    .protocols__subtitle {
        font-size: 14px;
    }

    .protocols__list {
        padding: 24px 0;
    }

    /* Scale down protocol cards */
    .protocols__card {
        width: 225px;
        min-width: 225px;
        height: 90px;
        padding: 9px 12px;
        transform: scale(0.75);
    }

    .protocols__card:hover {
        transform: scale(0.75) translateY(-4px);
    }

    .protocols__card-text {
        font-size: 24px;
    }

    /* Adjust marquee animation for mobile */
    @keyframes protocols-marquee {
        0% {
            transform: translateX(0);
        }
        100% {
            transform: translateX(calc(-225px * 5 - var(--space-2) * 5));
        }
    }

    .protocols__keynote {
        flex-direction: column;
        gap: var(--space-2);
        padding: 0 var(--space-2) 40px;
    }

    .protocols__keynote-card {
        max-width: 100%;
        height: auto;
        min-height: 300px;
        padding: 20px;
        gap: 24px;
    }

    .protocols__keynote-icon {
        width: 40px;
        height: 40px;
    }

    .protocols__keynote-header {
        font-size: 20px;
    }

    .protocols__keynote-caption {
        font-size: 14px;
    }
}

/* Tablet: 640px - 1023px */
@media (min-width: 640px) and (max-width: 1023px) {
    .protocols {
        padding-top: 80px;
    }

    .protocols__wrapper {
        gap: var(--space-3);
    }

    .protocols__text {
        padding: 0 var(--space-3);
    }

    .protocols__title {
        font-size: 48px;
    }

    .protocols__list {
        padding: 28px 0;
    }

    .protocols__keynote {
        padding: 0 var(--space-3) 40px;
        gap: var(--space-2);
    }

    .protocols__keynote-card {
        flex: 1 1 calc(50% - var(--space-2));
        min-width: 280px;
        height: auto;
        min-height: 320px;
    }
}

/* Desktop: 1024px - 1279px */
@media (min-width: 1024px) and (max-width: 1279px) {
    .protocols {
        padding-top: 100px;
    }

    .protocols__title {
        font-size: 56px;
    }

    .protocols__keynote {
        padding-bottom: 50px;
    }
}

/* Large Desktop: >= 1280px */
@media (min-width: 1280px) {
    .protocols__list-track {
        animation-duration: 30s; /* Slower on larger screens */
    }

    .protocols__keynote {
        gap: var(--space-3);
    }
}

/* Accessibility - Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    .protocols__card,
    .protocols__keynote-card {
        transition: none;
    }

    .protocols__card:hover,
    .protocols__keynote-card:hover {
        transform: none;
    }
}