.identification-guide {
    padding: var(--space-2xl) 0;
    background: #fff;
}

.identification-guide-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: var(--space-2xl);
    align-items: start;
}

.identification-guide-article {
    min-width: 0;
}

.identification-guide-hero {
    padding-bottom: var(--space-xl);
    margin-bottom: var(--space-xl);
    border-bottom: 1px solid var(--color-border);
}

.identification-guide-hero span {
    display: block;
    margin-bottom: var(--space-sm);
    color: var(--color-gold);
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.20em;
    text-transform: uppercase;
}

.identification-guide-hero h1 {
    margin: 0 0 var(--space-md);
    font-family: var(--font-serif);
    font-size: clamp(32px, 4vw, 56px);
    font-weight: 400;
    line-height: 1.04;
    letter-spacing: -0.03em;
    max-width: 22ch;
}

.identification-guide-hero p {
    max-width: 60ch;
    color: var(--color-text-muted);
    font-size: 15px;
    line-height: 1.72;
    margin: 0;
}

.identification-guide-rule {
    padding: var(--space-lg);
    margin-bottom: var(--space-xl);
    background: #FAFAF8;
    border-left: 3px solid var(--color-gold);
}

.identification-guide-rule strong {
    display: block;
    margin-bottom: var(--space-xs);
    color: var(--color-gold);
    font-size: 9px;
    font-weight: 700;
    letter-spacing: 0.20em;
    text-transform: uppercase;
}

.identification-guide-rule p {
    max-width: 72ch;
    margin: 0;
    color: var(--color-text);
    font-family: var(--font-serif);
    font-size: 17px;
    font-weight: 400;
    line-height: 1.55;
}

.identification-guide-section {
    display: grid;
    grid-template-columns: 72px minmax(0, 1fr);
    column-gap: var(--space-lg);
    row-gap: 0;
    padding: var(--space-xl) 0;
    border-bottom: 1px solid var(--color-border);
}

.identification-guide-section:first-of-type {
    border-top: 1px solid var(--color-border);
}

.identification-guide-section-kicker {
    font-family: var(--font-serif);
    font-size: 52px;
    font-weight: 400;
    letter-spacing: -0.05em;
    line-height: 1;
    color: var(--color-text);
    opacity: 0.08;
    padding-top: 4px;
    text-align: right;
}

.identification-guide-section-body {
    min-width: 0;
}

.identification-guide-section h2 {
    margin: 0 0 var(--space-md);
    color: var(--color-text);
    font-family: var(--font-serif);
    font-size: 22px;
    font-weight: 400;
    line-height: 1.15;
    letter-spacing: -0.01em;
}

.identification-guide-section p {
    color: var(--color-text-muted);
    font-size: 14px;
    line-height: 1.78;
    max-width: 72ch;
}

.identification-guide-section p + p {
    margin-top: var(--space-md);
}

.identification-guide-section aside {
    display: block;
    max-width: 64ch;
    margin-top: var(--space-lg);
    padding: var(--space-sm) var(--space-md);
    border-left: 2px solid var(--color-gold);
    background: #FAFAF8;
    color: var(--color-text);
    font-family: var(--font-serif);
    font-size: 14px;
    font-style: italic;
    line-height: 1.55;
}

.identification-guide-notes {
    padding-top: var(--space-xl);
}

.identification-guide-notes h2 {
    margin: 0 0 var(--space-md);
    font-family: var(--font-serif);
    font-size: 22px;
    font-weight: 400;
    line-height: 1.12;
    letter-spacing: -0.01em;
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--color-border);
}

.identification-guide-notes > div {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0;
    border: 1px solid var(--color-border);
}

.identification-guide-notes article {
    padding: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
    border-right: 1px solid var(--color-border);
    position: relative;
}

.identification-guide-notes article:nth-child(even) {
    border-right: 0;
}

.identification-guide-notes article:nth-last-child(-n+2) {
    border-bottom: 0;
}

.identification-guide-notes h3 {
    margin: 0 0 var(--space-xs);
    color: var(--color-text);
    font-family: var(--font-serif);
    font-size: 16px;
    font-weight: 400;
    line-height: 1.2;
}

.identification-guide-notes p {
    color: var(--color-text-muted);
    font-size: 13px;
    line-height: 1.65;
    margin: 0;
}

.identification-guide-sidebar {
    position: sticky;
    top: var(--header-height, 90px);
}

.identification-guide-sidebar > span {
    display: block;
    margin-bottom: var(--space-md);
    color: var(--color-gold);
    font-size: 9px;
    font-weight: 700;
    letter-spacing: 0.20em;
    text-transform: uppercase;
}

.identification-guide-timeline {
    display: grid;
    gap: 0;
    border: 1px solid var(--color-border);
}

.identification-guide-timeline-item {
    display: grid;
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 0;
    border-bottom: 1px solid var(--color-border);
}

.identification-guide-timeline-item:last-child {
    border-bottom: 0;
}

.identification-guide-timeline-item strong {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-sm) 0;
    border-right: 1px solid var(--color-border);
    color: var(--color-gold);
    font-family: var(--font-serif);
    font-size: 13px;
    font-weight: 400;
    line-height: 1;
    background: #FAFAF8;
}

.identification-guide-timeline-item div {
    padding: var(--space-sm) var(--space-md);
}

.identification-guide-timeline-item h2 {
    margin: 0 0 2px;
    color: var(--color-text);
    font-family: var(--font-serif);
    font-size: 14px;
    font-weight: 400;
    line-height: 1.2;
}

.identification-guide-timeline-item p {
    color: var(--color-text-muted);
    font-size: 11px;
    line-height: 1.5;
    margin: 0;
}

@media (max-width: 1000px) {
    .identification-guide-layout {
        grid-template-columns: 1fr;
    }

    .identification-guide-sidebar {
        position: static;
        order: -1;
    }

    .identification-guide-timeline {
        grid-template-columns: repeat(3, minmax(0, 1fr));
        border-right: 0;
    }

    .identification-guide-timeline-item {
        grid-template-columns: 1fr;
        border-right: 1px solid var(--color-border);
        border-bottom: 0;
    }

    .identification-guide-timeline-item strong {
        justify-content: flex-start;
        padding: var(--space-sm) var(--space-md);
        border-right: 0;
        border-bottom: 1px solid var(--color-border);
    }
}

@media (max-width: 640px) {
    .identification-guide {
        padding: var(--space-xl) 0;
    }

    .identification-guide-section {
        grid-template-columns: 1fr;
        gap: var(--space-sm);
        padding: var(--space-lg) 0;
    }

    .identification-guide-section-kicker {
        font-size: 36px;
        text-align: left;
        opacity: 0.10;
    }

    .identification-guide-notes > div {
        grid-template-columns: 1fr;
    }

    .identification-guide-notes article:nth-child(odd),
    .identification-guide-notes article:nth-child(even) {
        border-right: 0;
        border-bottom: 1px solid var(--color-border);
    }

    .identification-guide-notes article:last-child {
        border-bottom: 0;
    }

    .identification-guide-timeline {
        grid-template-columns: 1fr;
    }

    .identification-guide-timeline-item {
        border-right: 0;
        border-bottom: 1px solid var(--color-border);
    }

    .identification-guide-timeline-item:last-child {
        border-bottom: 0;
    }
}