/* ==========================================================================
   Formsworker 3D — Stylesheet
   Struktur:
     1. Custom Properties (Farben, Layout)
     2. Reset / Base
     3. Layout (Header, Container, Footer)
     4. Navigation (Topnav, Breadcrumbs, Skip-Link)
     5. Typografie (Headings, Lead)
     6. Komponenten (Grid, Card, Highlight-Box, CTA, Download-Box, Floating-CTA)
     7. Utilities (Abstände, visuelles Verstecken)
     8. Media Queries
   Hinweis: Bestehende Basis bleibt erhalten; einzelne Bereiche (z. B.
   Materialien-Seite) wurden strukturell und visuell modernisiert.
   ========================================================================== */

/* 1. Custom Properties
   -------------------------------------------------------------------------- */
:root {
    --main-color: #2c3e50;
    --accent-color: #3498db;
    --accent-color-hover: #2980b9;
    --success-color: #27ae60;
    --success-color-hover: #219150;
    --text-color: #333;
    --text-muted: #666;
    --text-footer: #888;
    --light-bg: #f7f9fb;
    --highlight-bg: #f4f7f6;
    --card-bg: #fdfdfd;
    --border-color: #eee;
    --border-color-soft: #dfe6eb;
    --border-color-float: #d9e1ea;
    --shadow-card: 0 5px 15px rgba(0, 0, 0, 0.05);
    --shadow-image: 0 2px 5px rgba(0, 0, 0, 0.05);
    --shadow-float: 0 8px 24px rgba(15, 35, 55, 0.10);
    --container-max: 1080px;
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --radius-pill: 999px;
}

/* 2. Reset / Base
   -------------------------------------------------------------------------- */
* {
    box-sizing: border-box;
}

body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    margin: 0;
    background-color: #fff;
}

a {
    color: var(--accent-color);
}

img {
    max-width: 100%;
    height: auto;
}

/* 3. Layout
   -------------------------------------------------------------------------- */
header {
    background: #fff;
    padding: 28px 20px 22px;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.header-logo {
    max-width: 300px;
    height: auto;
}

.hero-sub {
    font-size: 1.15em;
    color: var(--main-color);
    margin-top: 15px;
    font-weight: 300;
}

.container {
    max-width: var(--container-max);
    margin: auto;
    padding: 40px 20px;
}

footer {
    text-align: center;
    padding: 40px;
    font-size: 0.9em;
    color: var(--text-footer);
    border-top: 1px solid var(--border-color);
    background: #fafafa;
}

footer a {
    color: var(--text-footer);
}

/* 4. Navigation
   -------------------------------------------------------------------------- */
.topnav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-top: 18px;
}

.topnav a {
    text-decoration: none;
    color: var(--main-color);
    border: 1px solid var(--border-color-soft);
    padding: 8px 14px;
    border-radius: var(--radius-pill);
    font-size: 0.95rem;
}

.topnav a:hover,
.topnav a.active,
.topnav a[aria-current="page"] {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.breadcrumbs {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-bottom: 10px;
}

.breadcrumbs a {
    color: var(--text-muted);
}

/* Skip-Link: nur für Screenreader / Tastatur sichtbar, bleibt visuell verborgen. */
.skip-link {
    position: absolute;
    left: -9999px;
    top: auto;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

.skip-link:focus {
    position: static;
    width: auto;
    height: auto;
    padding: 8px 14px;
    background: var(--main-color);
    color: #fff;
}

/* Verhindert sichtbaren Fokus-Ring auf <main tabindex="-1"> nach Skip-Link. */
main[tabindex="-1"]:focus {
    outline: none;
}

/* 5. Typografie
   -------------------------------------------------------------------------- */
h1,
h2,
h3 {
    color: var(--main-color);
}

h1 {
    font-size: 2rem;
    margin-bottom: 10px;
}

h2 {
    border-bottom: 2px solid var(--accent-color);
    display: inline-block;
    padding-bottom: 5px;
    margin-bottom: 24px;
}

.lead {
    font-size: 1.08rem;
}

.muted {
    color: var(--text-muted);
}

/* 6. Komponenten
   -------------------------------------------------------------------------- */

/* Grid */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-top: 20px;
}

/* Card */
.card {
    border: 1px solid var(--border-color);
    padding: 24px;
    border-radius: var(--radius-md);
    background: var(--card-bg);
    transition: box-shadow 0.3s;
}

.card:hover {
    box-shadow: var(--shadow-card);
}

.card h3 {
    margin-top: 0;
    color: var(--accent-color);
}

.card ul {
    padding-left: 20px;
    margin: 10px 0;
}

.card li {
    margin-bottom: 5px;
}

/* Materialien-Seite: modernisierte Struktur mit technischer Anmutung */
.materials-hero {
    background: linear-gradient(180deg, #f8fbfd 0%, #ffffff 100%);
    border: 1px solid var(--border-color-soft);
    border-radius: var(--radius-lg);
    padding: 30px;
}

.materials-hero-lead {
    max-width: 880px;
    margin: 0;
}

.feature-chips,
.chip-list {
    list-style: none;
    padding: 0;
    margin: 16px 0 0 0;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.feature-chips li,
.chip-list li {
    border: 1px solid var(--border-color-soft);
    border-radius: var(--radius-pill);
    padding: 6px 12px;
    font-size: 0.9rem;
    color: #2a4a64;
    background: #fff;
    line-height: 1.35;
}

.materials-overview-section {
    margin-top: 52px;
}

.materials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 22px;
    margin-top: 20px;
}

.material-card {
    border: 1px solid var(--border-color-soft);
    border-radius: var(--radius-lg);
    background: #fff;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    box-shadow: 0 3px 12px rgba(18, 44, 66, 0.04);
}

.material-card-featured {
    background: linear-gradient(180deg, #fcfeff 0%, #ffffff 100%);
}

.material-card-priority {
    border-color: #cfdce7;
    box-shadow: 0 6px 16px rgba(18, 44, 66, 0.07);
}

.material-card-head h3 {
    margin: 0;
    color: var(--main-color);
    font-size: 1.18rem;
    line-height: 1.35;
}

.material-card-head h3 a {
    color: #1f405c;
    text-decoration: none;
    border-bottom: 1px solid rgba(44, 62, 80, 0.35);
    padding-bottom: 1px;
}

.material-card-head h3 a:hover {
    color: #18364e;
    border-bottom-color: #18364e;
}

.material-card-head h3 a:focus-visible {
    outline: 2px solid rgba(52, 152, 219, 0.45);
    outline-offset: 3px;
    border-radius: 2px;
}

.material-card-tag {
    margin: auto 0 0 0;
    align-self: flex-start;
    font-size: 0.74rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    font-weight: 700;
    color: #2f4d67;
    border: 1px solid #d5e1ea;
    border-radius: var(--radius-pill);
    background: #f7fafc;
    padding: 3px 9px;
}

.material-card p {
    margin: 0;
    font-size: 1rem;
    line-height: 1.72;
}

.material-card-block {
    border-top: 1px solid #edf2f6;
    padding-top: 13px;
}

.material-card-block h4 {
    margin: 0 0 6px 0;
    color: var(--main-color);
    font-size: 1rem;
}

/* Bildfähige Struktur:
   Sobald echte Materialbilder vorliegen, kann pro Karte eine
   .material-card-media oberhalb des Texts ergänzt werden. */
.material-card-media {
    display: none;
}

.material-card-media img {
    display: block;
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    border-radius: var(--radius-md);
    border: 1px solid #e5edf3;
}

.table-wrap {
    overflow-x: auto;
    border: 1px solid #d9e3ec;
    border-radius: var(--radius-md);
    background: #fff;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

.material-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 700px;
}

.material-table th,
.material-table td {
    padding: 14px 15px;
    text-align: left;
    border-bottom: 1px solid #edf2f6;
    vertical-align: top;
    font-size: 0.96rem;
    line-height: 1.6;
}

.material-table thead th {
    background: #eef5fb;
    color: #1f3e58;
    font-weight: 700;
    border-bottom: 1px solid #d8e3ee;
}

.material-table tbody th {
    color: var(--main-color);
    font-weight: 700;
}

.material-table tbody tr:nth-child(even) {
    background: #fbfdff;
}

.material-table tbody tr:last-child th,
.material-table tbody tr:last-child td {
    border-bottom: none;
}

.process-grid {
    margin-top: 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 18px;
    position: relative;
}

.process-step {
    border: 1px solid var(--border-color-soft);
    border-radius: var(--radius-md);
    padding: 20px;
    background: #fff;
    box-shadow: 0 3px 10px rgba(18, 44, 66, 0.04);
}

.process-step-no {
    margin: 0 0 8px 0;
    color: var(--accent-color);
    font-size: 0.82rem;
    letter-spacing: 0.08em;
    font-weight: 700;
}

.process-step h3 {
    margin: 0 0 8px 0;
    font-size: 1.1rem;
    color: var(--main-color);
}

.process-step p {
    margin: 0;
}

@media (min-width: 901px) {
    .process-grid::before {
        content: "";
        position: absolute;
        left: 8%;
        right: 8%;
        top: 40px;
        height: 1px;
        background: linear-gradient(90deg, transparent 0%, #d8e3ec 12%, #d8e3ec 88%, transparent 100%);
        z-index: 0;
    }

    .process-step {
        position: relative;
        z-index: 1;
    }
}

.highlight-box-technical {
    border-left: 4px solid var(--accent-color);
    background: linear-gradient(180deg, #f2f7fb 0%, #f8fbfd 100%);
    border: 1px solid #dbe7f0;
    box-shadow: 0 4px 14px rgba(16, 40, 60, 0.05);
}

.highlight-box-technical h2 {
    margin-top: 0;
    margin-bottom: 10px;
}

.highlight-box-technical p {
    margin: 0;
    line-height: 1.7;
}

.btn-inline {
    margin-top: 16px;
}

/* PA6-CF Detailseite */
.pa6-detail-hero h1 {
    max-width: 900px;
}

.pa6-section p {
    max-width: 920px;
}

.pa6-list-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.pa6-list-card {
    border: 1px solid var(--border-color-soft);
    border-radius: var(--radius-lg);
    padding: 22px;
    background: #fff;
    box-shadow: 0 3px 10px rgba(18, 44, 66, 0.04);
}

.pa6-list-card h3 {
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.pa6-list-card ul {
    margin: 0;
    padding-left: 20px;
}

.pa6-list-card li {
    margin-bottom: 8px;
}

.pa6-check-card {
    border: 1px solid #d6e2ec;
    border-radius: var(--radius-md);
    background: #f8fbfe;
    padding: 22px;
}

.pa6-check-card p {
    margin: 0 0 10px 0;
    font-weight: 700;
    color: var(--main-color);
}

.pa6-check-card ul {
    margin: 0;
    padding-left: 20px;
}

.pa6-check-card li {
    margin-bottom: 8px;
    line-height: 1.6;
}

.pa6-reference-grid {
    margin-top: 18px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 18px;
}

.pa6-reference-item {
    margin: 0;
    border: 1px solid var(--border-color-soft);
    border-radius: var(--radius-lg);
    background: #fff;
    overflow: hidden;
    box-shadow: 0 4px 14px rgba(16, 40, 60, 0.06);
}

.pa6-reference-item img {
    display: block;
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    border-bottom: 1px solid #e8eef4;
}

.pa6-reference-item figcaption {
    padding: 12px 14px;
    font-size: 0.93rem;
    color: #2f4d67;
}

.pa6-links-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.pa6-links-list a {
    display: inline-block;
    text-decoration: none;
    color: var(--main-color);
    border: 1px solid var(--border-color-soft);
    border-radius: var(--radius-pill);
    padding: 8px 14px;
    background: #fff;
}

.pa6-links-list a:hover {
    border-color: #c5d5e2;
    color: #1f405c;
}

/* Gemeinsame Werkstoffgruppen-Seiten */
.material-group-hero h1 {
    max-width: 920px;
}

.material-group-table-wrap {
    max-width: 980px;
}

.material-tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 18px;
}

.material-tech-card {
    border: 1px solid var(--border-color-soft);
    border-radius: var(--radius-md);
    background: #fff;
    padding: 20px;
    box-shadow: 0 3px 10px rgba(18, 44, 66, 0.04);
}

.material-tech-card h3 {
    margin-top: 0;
    margin-bottom: 8px;
    font-size: 1.08rem;
}

.material-tech-card p {
    margin: 0;
}

.material-reference-grid {
    margin-top: 16px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 18px;
}

.material-reference-grid-two {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.material-reference-item {
    margin: 0;
    border: 1px solid var(--border-color-soft);
    border-radius: var(--radius-lg);
    background: #fff;
    overflow: hidden;
    box-shadow: 0 4px 14px rgba(16, 40, 60, 0.06);
}

.material-reference-item img {
    display: block;
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    border-bottom: 1px solid #e8eef4;
}

.material-reference-item figcaption {
    padding: 12px 14px;
    font-size: 0.93rem;
    color: #2f4d67;
}

.material-reference-placeholder-box {
    min-height: 220px;
    display: grid;
    place-items: center;
    text-align: center;
    padding: 18px;
    background: linear-gradient(180deg, #f7fafd 0%, #f2f7fb 100%);
    border-bottom: 1px solid #e2ebf2;
}

.material-reference-placeholder-box p {
    margin: 0;
    color: #34526c;
    border: 1px dashed #adc2d4;
    border-radius: var(--radius-md);
    padding: 14px 16px;
    background: rgba(255, 255, 255, 0.65);
    font-weight: 600;
    line-height: 1.5;
}

.material-check-card {
    border: 1px solid #d6e2ec;
    border-radius: var(--radius-md);
    background: #f8fbfe;
    padding: 22px;
}

.material-check-card ul {
    margin: 0;
    padding-left: 20px;
}

.material-check-card li {
    margin-bottom: 8px;
    line-height: 1.6;
}

.material-page-links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.material-page-links h2 {
    width: 100%;
}

.material-page-links a {
    display: inline-block;
    text-decoration: none;
    color: var(--main-color);
    border: 1px solid var(--border-color-soft);
    border-radius: var(--radius-pill);
    padding: 8px 14px;
    background: #fff;
}

.material-page-links a:hover {
    border-color: #c5d5e2;
    color: #1f405c;
}

.page-quicklinks {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.page-quicklinks a {
    display: inline-block;
    text-decoration: none;
    color: var(--main-color);
    border: 1px solid var(--border-color-soft);
    border-radius: var(--radius-pill);
    padding: 8px 14px;
    background: #fff;
}

.page-quicklinks a:hover {
    border-color: #c5d5e2;
    color: #1f405c;
}

.materials-cluster-links p {
    margin: 0 0 14px 0;
}

.materials-cluster-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 10px;
}

.materials-cluster-list li a {
    display: inline-block;
    text-decoration: none;
    color: var(--main-color);
    border: 1px solid var(--border-color-soft);
    border-radius: var(--radius-pill);
    padding: 8px 14px;
    background: #fff;
}

.materials-cluster-list li a:hover {
    border-color: #c5d5e2;
    color: #1f405c;
}

/* Highlight-Box */
.highlight-box {
    background: var(--highlight-bg);
    border-left: 4px solid var(--accent-color);
    padding: 22px;
    border-radius: var(--radius-md);
    margin: 30px 0;
}

/* Referenzen */
.references-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
    margin-top: 20px;
}

.ref-item {
    text-align: center;
}

.ref-item-placeholder .material-reference-placeholder-box {
    min-height: 240px;
}

.ref-item img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-image);
    transition: transform 0.3s;
    background-color: #f9f9f9;
    display: block;
    margin: 0 auto;
}

.ref-item img:hover {
    transform: scale(1.03);
}

.ref-desc {
    font-size: 0.95em;
    color: var(--text-muted);
    margin-top: 15px;
    font-style: italic;
    text-align: left;
}

.ref-desc strong {
    color: var(--main-color);
    font-style: normal;
}

.container section > p {
    max-width: 920px;
}

/* CTA-Section */
.cta-section {
    background: var(--main-color);
    color: #fff;
    padding: 60px 20px;
    text-align: center;
    margin-top: 60px;
}

.cta-section h2 {
    color: #fff;
    border-bottom: 2px solid var(--accent-color);
}

/* Buttons */
.btn {
    background: var(--accent-color);
    color: #fff;
    padding: 15px 30px;
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-weight: bold;
    display: inline-block;
    margin-top: 20px;
    transition: background 0.3s;
}

.btn:hover {
    background: var(--accent-color-hover);
}

/* Download-Box */
.download-box {
    background: var(--highlight-bg);
    border: 2px dashed var(--accent-color);
    padding: 30px;
    text-align: center;
    margin-top: 40px;
    border-radius: var(--radius-lg);
}

.btn-download {
    background: var(--success-color);
    color: #fff;
    padding: 12px 25px;
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-weight: bold;
    display: inline-block;
    margin-top: 10px;
}

.btn-download:hover {
    background: var(--success-color-hover);
}

/* Floating-CTA (fixed rechts, auf mobil statisch) */
.floating-cta {
    position: fixed;
    right: 24px;
    top: 140px;
    width: 260px;
    z-index: 1000;
}

.floating-cta-inner {
    background: #ffffff;
    border: 1px solid var(--border-color-float);
    border-radius: 14px;
    padding: 18px;
    box-shadow: var(--shadow-float);
}

.floating-cta-kicker {
    margin: 0 0 8px 0;
    font-size: 0.9rem;
    font-weight: 700;
    color: #0f3555;
}

.floating-cta-text {
    margin: 0 0 14px 0;
    font-size: 0.95rem;
    line-height: 1.45;
    color: #36506a;
}

.floating-cta .btn {
    display: block;
    text-align: center;
}

/* Rechtsseiten (Impressum/Datenschutz):
   Identischer visueller Container wie vorher, aber im gemeinsamen Layout. */
.legal {
    max-width: 800px;
    margin: auto;
    padding: 40px 20px;
}

.legal h1 {
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 10px;
}

.legal h2 {
    margin-top: 30px;
    /* Ursprünglicher Zustand von impressum/datenschutz: kein margin-bottom,
       kein border, kein inline-block. Globale h2-Werte müssen hier zurückgesetzt
       werden, damit die Rechtsseiten visuell identisch bleiben. */
    margin-bottom: 0;
    font-size: 1.2em;
    display: block;
    border-bottom: none;
    padding-bottom: 0;
}

.legal h3 {
    font-size: 1.1em;
}

.legal p {
    /* Original-Impressum hatte p { margin: 10px 0 }. */
    margin: 10px 0;
}

.legal .back-link {
    display: inline-block;
    margin-top: 40px;
    text-decoration: none;
    color: var(--accent-color);
    font-weight: bold;
}

/* 7. Utilities
   -------------------------------------------------------------------------- */
.section-gap {
    margin-top: 68px;
}

.section-gap-sm {
    margin-top: 48px;
}

.section-gap-xs {
    margin-top: 28px;
}

/* 8. Media Queries
   -------------------------------------------------------------------------- */
@media (max-width: 1200px) {
    .floating-cta {
        right: 16px;
        width: 230px;
    }
}

@media (max-width: 980px) {
    .floating-cta {
        position: static;
        width: auto;
        margin: 28px auto 0 auto;
        max-width: 760px;
        padding: 0 20px;
    }
}

@media (max-width: 700px) {
    .hero-sub {
        font-size: 1rem;
    }

    h1 {
        font-size: 1.7rem;
    }

    .materials-hero {
        padding: 20px;
    }

    .materials-overview-section {
        margin-top: 40px;
    }

    .material-card {
        padding: 19px;
        gap: 14px;
    }

    .material-card p {
        font-size: 0.98rem;
        line-height: 1.66;
    }

    .material-card-head h3 {
        font-size: 1.1rem;
    }

    .feature-chips li,
    .chip-list li {
        font-size: 0.84rem;
        padding: 6px 10px;
    }

    .material-table th,
    .material-table td {
        padding: 12px 13px;
        font-size: 0.92rem;
    }

    .process-step {
        padding: 17px;
    }

    .section-gap {
        margin-top: 56px;
    }

    .section-gap-sm {
        margin-top: 40px;
    }

    .pa6-list-card,
    .pa6-check-card,
    .material-check-card,
    .material-tech-card {
        padding: 18px;
    }

    .pa6-reference-item figcaption {
        padding: 10px 12px;
    }

    .material-reference-placeholder-box {
        min-height: 180px;
    }

    .ref-item-placeholder .material-reference-placeholder-box {
        min-height: 180px;
    }
}

@media (max-width: 420px) {
    .materials-grid {
        grid-template-columns: 1fr;
        gap: 18px;
    }

    .feature-chips,
    .chip-list {
        gap: 8px;
    }

    .material-card-tag {
        font-size: 0.7rem;
    }

    .table-wrap {
        border-radius: var(--radius-sm);
    }
}