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

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    background: #f4f6fa;            /* main page background */
    color: #1f2937;                 /* primary text */
    line-height: 1.7;
}


img {
    width: 100%;
    display: block;
}

/* ================= COMMON ================= */
.proto-container {
    max-width: 900px;
    margin: auto;
    padding: 0 1.25rem;
}

/* ================= HERO ================= */
.proto-hero {
    padding: 5rem 0 4rem;
    background: linear-gradient(180deg, #ffffff, #eef2f7);
    text-align: center;
}

.proto-hero h1 {
    color: #111827;
}

.proto-tag {
    color: #2563eb;   /* tech blue */
}

.proto-intro {
    color: #374151;
}


/* ================= PROTOTYPE SLIDER ================= */

.proto-slider {
    padding: 3rem 1rem;
    background: #f4f6fb; /* NOT black */
}

.proto-slider-wrapper {
    max-width: 1100px;
    margin: auto;
    position: relative;
    overflow: hidden;
    border-radius: 18px;
}

.proto-slider-track {
    display: flex;
    transition: transform 0.6s ease;
    will-change: transform;
}

.proto-slide {
    min-width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.proto-slide img {
    width: 100%;
    max-width: 900px;
    height: auto;
    object-fit: contain;
    border-radius: 14px;
}

/* ================= NAV BUTTONS ================= */

.proto-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 46px;
    height: 46px;
    border-radius: 50%;
    border: none;
    background: rgba(255,255,255,0.9);
    color: #111;
    font-size: 26px;
    cursor: pointer;
    z-index: 5;
    box-shadow: 0 6px 18px rgba(0,0,0,0.2);
}

.proto-nav.prev { left: 12px; }
.proto-nav.next { right: 12px; }

.proto-nav:hover {
    background: #ffffff;
}

/* ================= MOBILE FIXES ================= */

@media (max-width: 768px) {
    .proto-slider {
        padding: 2rem 0.5rem;
    }

    .proto-slide img {
        max-width: 100%;
    }
}


/* ================= DETAILS ================= */
.proto-details {
    padding: 4.5rem 0;
    background: #ffffff;
}

.proto-details.alt {
    background: #f0f3f9;
}

.proto-details h2 {
    color: #111827;
}

.proto-details p {
    color: #374151;
}


.proto-list {
    margin: 1.2rem 0 1.5rem;
    padding-left: 1.2rem;
}

.proto-list li {
    color: #1f2937;
}

.proto-note {
    color: #2563eb;
}


/* ================= MOBILE ================= */
@media (max-width: 768px) {
    .proto-hero {
        padding: 4rem 0 3rem;
    }

    .proto-slider {
        padding: 2.5rem 0 3rem;
    }

    .slider-wrapper {
        border-radius: 14px;
    }
}

/* ================= TECHNICAL SPECS ================= */

.proto-specs {
    padding: 4.5rem 1rem;
    background: #ffffff;
}

.proto-specs h2 {
    text-align: center;
    margin-bottom: 0.75rem;
    color: #111827;
}

.specs-intro {
    max-width: 760px;
    margin: 0 auto 2.5rem;
    text-align: center;
    color: #374151;
    font-size: 0.95rem;
}

.specs-table-wrapper {
    max-width: 900px;
    margin: auto;
    overflow-x: auto; /* safety for very small screens */
}

.specs-table {
    width: 100%;
    border-collapse: collapse;
    background: #f9fafb;
    border-radius: 14px;
    overflow: hidden;
    box-shadow: 0 12px 30px rgba(0,0,0,0.08);
}

.specs-table tr {
    border-bottom: 1px solid #e5e7eb;
}

.specs-table tr:last-child {
    border-bottom: none;
}

.specs-table th,
.specs-table td {
    padding: 1rem 1.2rem;
    text-align: left;
    vertical-align: top;
}

.specs-table th {
    width: 35%;
    font-weight: 600;
    color: #1f2937;
    background: #eef2f7;
}

.specs-table td {
    color: #374151;
    background: #ffffff;
}

/* ================= MOBILE OPTIMIZATION ================= */
@media (max-width: 640px) {
    .specs-table th,
    .specs-table td {
        padding: 0.85rem 0.9rem;
        font-size: 0.9rem;
    }

    .specs-table th {
        width: 42%;
    }
}