/* ==================================================
   TECHNICAL-PAGES.CSS — SHARED TECHNICAL PAGE LAYOUT
   ================================================== */

.technical-page {
    min-height: 100vh;
    background: var(--color-background);
    color: var(--color-text);
}

/* Legacy technical-header rules are retained temporarily for compatibility. */
.technical-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--color-background);
    border-bottom: 1px solid var(--color-border);
    padding-block: var(--space-sm);
}

.technical-header .container {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 1rem;
    position: relative;
}

.technical-header .logo {
    grid-column: 1 / 2;
    justify-self: start;
    display: flex;
}

.technical-header .logo-mark {
    height: 64px;
    width: auto;
    display: block;
}

.technical-tools {
    grid-column: 2 / 3;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.technical-nav {
    grid-column: 1 / -1;
    width: 100%;
}

.technical-nav ul {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

.technical-nav a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: inherit;
}

.technical-nav a:hover,
.technical-nav a:focus-visible {
    color: var(--color-text);
}

.technical-language-note {
    margin-top: 50px;
    padding: 0.2rem var(--space-sm);
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    line-height: 1.35;
    text-align: center;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-background);
}

.technical-main {
    padding-bottom: var(--space-2xl);
}

.technical-hero {
    padding: clamp(5rem, 10vw, 9rem) 0 var(--space-2xl);
}

.technical-hero .container {
    max-width: 920px;
}

.technical-hero h1 {
    max-width: 850px;
    margin: 0 0 var(--space-md);
    font-size: clamp(2.4rem, 6vw, 4.6rem);
    line-height: 1.05;
}

.technical-hero .lead {
    max-width: 760px;
    color: var(--color-text-muted);
    font-size: clamp(1.05rem, 2vw, 1.3rem);
    line-height: 1.7;
}

.technical-section {
    padding: var(--space-2xl) 0;
}

.technical-section--surface {
    background: var(--color-surface);
    border-block: 1px solid var(--color-border);
}

.technical-section h2 {
    margin-bottom: var(--space-md);
    font-size: clamp(1.8rem, 4vw, 2.7rem);
}

.technical-section p {
    max-width: 800px;
    line-height: 1.75;
}

.technical-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-sm) var(--space-lg);
    margin: var(--space-lg) 0 0;
    padding: 0;
    list-style: none;
}

.technical-list > article,
.technical-list li {
    padding: var(--space-md);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    background: var(--color-surface-raised);
}

.technical-list > article[hidden] {
    display: none;
}

/* ==================================================
   INSIGHT CATEGORY FILTERS
   ================================================== */

.insight-filters {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin: var(--space-lg) 0 var(--space-md);
}

.insight-filter {
    border: 1px solid var(--color-border);
    border-radius: 999px;
    background: var(--color-surface-raised);
    color: var(--color-text-muted);
    padding: 0.45rem 0.8rem;
    font: inherit;
    font-size: var(--text-sm);
    line-height: 1.2;
    cursor: pointer;
}

.insight-filter:hover,
.insight-filter:focus-visible {
    border-color: var(--color-accent);
    color: var(--color-text);
}

.insight-filter.is-active {
    border-color: var(--color-accent);
    background: var(--color-accent);
    color: var(--color-background);
}

.insight-card__categories {
    margin: 0 0 var(--space-xs);
    color: var(--color-accent);
    font-size: var(--text-sm);
    font-weight: 600;
    line-height: 1.4;
}

/*
   ETROYL Insight — a visually distinct treatment for
   engineering principles worth remembering.
*/
.technical-insight {
    border-left: 3px solid var(--color-accent) !important;
    background: var(--color-surface) !important;
    padding: var(--space-lg) !important;
}

.technical-insight__label {
    margin-bottom: var(--space-xs);
    color: var(--color-accent);
    font-size: var(--text-sm);
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.technical-insight__statement {
    max-width: 700px;
    color: var(--color-text);
    font-size: clamp(1.05rem, 2vw, 1.25rem);
    font-weight: 600;
    line-height: 1.65;
}

.technical-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-top: var(--space-lg);
}

.technical-links a {
    color: var(--color-accent);
    text-decoration: none;
}

.technical-links a:hover,
.technical-links a:focus-visible {
    text-decoration: underline;
}

.technical-footer {
    border-top: 1px solid var(--color-border);
    padding: var(--space-lg) 0;
    color: var(--color-text-muted);
    font-size: var(--text-sm);
}

@media (max-width: 680px) {
    .technical-header .container {
        grid-template-columns: 1fr auto;
        padding-block: var(--space-9xs);
    }

    .technical-nav {
        order: 3;
    }

    .technical-nav ul {
        justify-content: center;
        gap: var(--space-xs);
        overflow-x: visible;
        flex-wrap: wrap;
        padding-bottom: 0.2rem;
        font-size: var(--text-sm);
    }

    .technical-list {
        grid-template-columns: 1fr;
    }

    .technical-hero {
        padding-top: var(--space-2xl);
    }

    .technical-language-note {
        margin-top: 54px;
        padding-block: 0.15rem;
    }
}

@media (max-width: 410px) {
    .technical-header .container {
        grid-template-columns: 1fr auto;
        padding-block: var(--space-20xs);
    }

    .technical-nav {
        order: 3;
    }

    .technical-nav ul {
        justify-content: center;
        gap: var(--space-xs);
        overflow-x: visible;
        flex-wrap: wrap;
        padding-bottom: var(--space-20xs);
        font-size: var(--text-sm);
    }

    .technical-list {
        grid-template-columns: 1fr;
    }

    .technical-hero {
        padding-top: var(--space-2xl);
    }

    .technical-language-note {
        margin-top: 54px;
        padding-block: 0.15rem;
    }
}

@media (max-width: 370px) {
    .technical-header .container {
        grid-template-columns: 1fr auto;
        padding-block: var(--space-20xs);
    }

    .technical-nav {
        order: 3;
    }

    .technical-nav ul {
        justify-content: center;
        gap: var(--space-xs);
        overflow-x: visible;
        flex-wrap: wrap;
        padding-bottom: var(--space-20xs);
        font-size: var(--text-sm);
    }

    .technical-list {
        grid-template-columns: 1fr;
    }

    .technical-hero {
        padding-top: var(--space-2xl);
    }

    .technical-language-note {
        margin-top: 86px;
        padding-block: 0.15rem;
    }
}