:root {
    --background-color: #f5f5f7;
    --card-background: #ffffff;
    --card-inner-bg: #fbfbfd;
    --text-color: #1d1d1f;
    --secondary-text-color: #86868b;
    --accent-color: #0071e3;
    --sidebar-width: 260px;
    --card-border-radius: 18px;
    --card-inner-radius: 14px;
    --section-spacing: 24px;
    --sidebar-bg: #ffffff;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.47059;
    font-weight: 400;
    letter-spacing: -0.022em;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
}

/* Layout Engine */
.layout-container {
    display: flex;
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
    gap: 32px;
}

/* Sidebar Navigation */
.sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
    position: sticky;
    top: 40px;
    height: fit-content;
    background-color: var(--sidebar-bg);
    border-radius: var(--card-border-radius);
    padding: 24px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.sidebar h2 {
    font-size: 14px;
    text-transform: uppercase;
    color: var(--secondary-text-color);
    letter-spacing: 0.1em;
    margin-bottom: 16px;
    margin-top: 0;
}

.nav-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.nav-item {
    margin-bottom: 8px;
}

.nav-link {
    display: block;
    padding: 10px 14px;
    color: var(--text-color);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    border-radius: 10px;
    transition: background-color 0.2s, color 0.2s;
}

.nav-link:hover {
    background-color: #f2f2f7;
    color: var(--accent-color);
}

.nav-link.active {
    background-color: var(--accent-color);
    color: #ffffff;
}

/* Main Content Area */
.main-content {
    flex-grow: 1;
    min-width: 0;
}

/* Base Card System */
.card {
    background-color: var(--card-background);
    border-radius: var(--card-border-radius);
    padding: 32px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    margin-bottom: var(--section-spacing);
    border: 1px solid rgba(0, 0, 0, 0.05);
    overflow: hidden;
    /* For collapsible cards */
}

/* Collapsible Card Header Styling */
details.card {
    padding: 0;
    /* Let summary and content handle padding */
}

details.card>summary {
    padding: 32px;
    cursor: pointer;
    list-style: none;
    outline: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.2s;
}

details.card>summary:hover {
    background-color: #fbfbfd;
}

details.card>summary::-webkit-details-marker {
    display: none;
}

details.card>summary::after {
    content: '+';
    font-size: 28px;
    font-weight: 300;
    color: var(--secondary-text-color);
    transition: transform 0.3s;
}

details.card[open]>summary::after {
    transform: rotate(45deg);
}

.card h2.section-title,
details.card>summary h2.section-title {
    font-size: 28px;
    margin: 0;
    font-weight: 600;
}

/* Card Content Container (for padding when open) */
details.card>.card-content {
    padding: 0 32px 32px 32px;
}

/* Document Card (Header/Metadata) */
.card-document {
    background: linear-gradient(135deg, #ffffff 0%, #f9f9fb 100%);
}

.card-document h1 {
    font-size: 36px;
    margin: 0 0 8px 0;
    font-weight: 700;
}

.metadata-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 16px;
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid #f2f2f7;
}

.metadata-item {
    display: flex;
    flex-direction: column;
}

.metadata-label {
    font-size: 12px;
    color: var(--secondary-text-color);
    text-transform: uppercase;
    font-weight: 600;
    margin-bottom: 4px;
}

.metadata-value {
    font-size: 15px;
    font-weight: 600;
}

/* Composition Card (Narrative) */
.card-composition .narrative-content {
    font-size: 17px;
    line-height: 1.6;
}

.inner-card,
.leaflet-card {
    background-color: var(--card-inner-bg);
    border-radius: var(--card-inner-radius);
    padding: 20px;
    margin-bottom: 20px;
    border: 1px solid #f2f2f7;
    position: relative;
    overflow: hidden;
}

/* Color Accents for Inner Cards */
.inner-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 6px;
    opacity: 0.8;
}

.card-details::before {
    background-color: var(--accent-color);
}

.card-auth::before {
    background-color: #34c759;
}

.card-pack::before {
    background-color: #af52de;
}

.card-phys::before {
    background-color: #ff9500;
}

/* Clinical Details Card */
.card-clinical {
    border-left: 6px solid #30b0c7;
    /* Teal for clinical knowledge */
}

/* Product Details Card (Accordion Wrapper) */
.card-products {
    background-color: #f5f5f7;
    padding: 24px;
}

/* Accordion Sub-cards (Used in Product and Clinical Sections) */
.accordion-item {
    background-color: #ffffff;
    border-radius: 14px;
    margin-bottom: 16px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.02);
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.accordion-summary {
    padding: 20px 24px;
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    font-size: 18px;
    background-color: #ffffff;
    transition: background-color 0.2s;
}

.accordion-summary:hover {
    background-color: #f9f9fb;
}

.accordion-summary::-webkit-details-marker {
    display: none;
}

.accordion-summary::after {
    content: '+';
    font-size: 24px;
    font-weight: 300;
    color: var(--secondary-text-color);
    transition: transform 0.3s;
}

.accordion-item[open] .accordion-summary::after {
    transform: rotate(45deg);
}

.accordion-content {
    padding: 24px;
    border-top: 1px solid #f2f2f7;
}

.item-status {
    font-size: 12px;
    background: rgba(52, 199, 89, 0.1);
    color: #248a3d;
    padding: 4px 10px;
    border-radius: 20px;
    margin-left: 12px;
}

/* Grid for Clinical Details inside product content */
.clinical-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

/* Utilities */
.badge {
    display: inline-block;
    padding: 6px 14px;
    border-radius: 20px;
    background-color: var(--text-color);
    color: #ffffff;
    font-size: 13px;
    font-weight: 600;
}

.pill {
    background-color: #e8e8ed;
    color: var(--text-color);
    padding: 6px 16px;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
    display: inline-block;
    border: none;
    cursor: pointer;
    transition: background-color 0.2s;
}

.pill:hover {
    background-color: #d2d2d7;
}

/* Tablet visual remains */
.tablet-visual {
    width: 60px;
    height: 60px;
    background-color: #fff;
    border: 2px solid #e5e5e5;
    border-radius: 50%;
    margin: 0 auto 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
}

.data-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    font-size: 14px;
}

.data-label {
    color: var(--secondary-text-color);
}

.data-value {
    font-weight: 600;
    text-align: right;
}

/* Responsive Design */
@media (max-width: 900px) {
    .layout-container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        position: static;
        margin-bottom: 24px;
    }
}