/* ===================================================
   Lortz Ingenieure & Sachverständige — style.css
   Shared stylesheet for all pages
   =================================================== */

/* --- CSS Custom Properties --- */
:root {
    --font-sans: "Inter", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;

    /* Colors – Light Mode */
    --color-primary: #1b4d89;
    --color-primary-dark: #143a68;
    --color-accent: #2b6777;
    --color-energy: #4a9e6b;
    --color-cta: #e07b39;
    --color-cta-hover: #c86a2e;
    --color-text: #2c2c2c;
    --color-text-light: #5a5a5a;
    --color-bg: #ffffff;
    --color-bg-alt: #f2f2f2;
    --color-bg-card: #ffffff;
    --color-border: #e0e0e0;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 6rem;

    /* Shadows */
    --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-card-hover: 0 6px 20px rgba(0, 0, 0, 0.14);
}

/* --- Dark Mode --- */
@media (prefers-color-scheme: dark) {
    :root {
        --color-primary: #5b9bd5;
        --color-primary-dark: #4a8bc4;
        --color-accent: #3d8a9a;
        --color-energy: #5cb87a;
        --color-cta: #e8924f;
        --color-cta-hover: #f0a468;
        --color-text: #e8e8e8;
        --color-text-light: #a0a0a0;
        --color-bg: #1a1a2e;
        --color-bg-alt: #222240;
        --color-bg-card: #2a2a4a;
        --color-border: #3a3a5a;
        --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.3);
        --shadow-card-hover: 0 6px 20px rgba(0, 0, 0, 0.4);
        --color-footer-bg: #111128;
    }
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: clamp(1rem, 1.5vw, 1.125rem);
    font-weight: 400;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
}

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

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--color-primary-dark);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 3px solid var(--color-cta);
    outline-offset: 2px;
}

ul, ol {
    list-style: none;
}

address {
    font-style: normal;
}

/* --- Skip Link --- */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-sm);
    background: var(--color-primary);
    color: #fff;
    padding: var(--space-xs) var(--space-sm);
    border-radius: 0 0 8px 8px;
    z-index: 1000;
    font-weight: 500;
}

.skip-link:focus {
    top: 0;
    color: #fff;
}

/* --- Container --- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-sm);
}

/* --- Typography --- */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.25;
    color: var(--color-primary);
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
}

h2 {
    font-size: clamp(1.5rem, 3.5vw, 2.5rem);
    margin-bottom: var(--space-sm);
}

h3 {
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
    margin-bottom: var(--space-xs);
}

p {
    margin-bottom: var(--space-sm);
}

small, .caption {
    font-size: clamp(0.8rem, 1.2vw, 0.875rem);
}

/* --- Header --- */
.site-header {
    background: var(--color-bg);
    border-bottom: 2px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-sm) var(--space-sm);
    max-width: 1200px;
    margin: 0 auto;
    gap: var(--space-sm);
}

.site-logo {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-weight: 700;
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--color-primary);
    text-decoration: none;
    white-space: nowrap;
}

.site-logo:hover {
    color: var(--color-primary-dark);
}

.site-logo svg {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
}

/* Mobile nav toggle (checkbox hack) */
.nav-toggle {
    display: none;
}

.nav-toggle-label {
    display: none;
    cursor: pointer;
    padding: var(--space-xs);
}

.nav-toggle-label span,
.nav-toggle-label span::before,
.nav-toggle-label span::after {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    position: relative;
    transition: transform 0.3s ease;
}

.nav-toggle-label span::before,
.nav-toggle-label span::after {
    content: "";
    position: absolute;
}

.nav-toggle-label span::before {
    top: -7px;
}

.nav-toggle-label span::after {
    top: 7px;
}

/* Nav list */
.main-nav ul {
    display: flex;
    gap: var(--space-xs);
    flex-wrap: wrap;
}

.main-nav a {
    display: block;
    padding: var(--space-xs) var(--space-xs);
    color: var(--color-text);
    font-weight: 500;
    font-size: clamp(0.85rem, 1.2vw, 0.95rem);
    border-radius: 4px;
    transition: background 0.2s ease, color 0.2s ease;
}

.main-nav a:hover {
    background: var(--color-bg-alt);
    color: var(--color-primary);
}

.main-nav a[aria-current="page"] {
    color: var(--color-primary);
    border-bottom: 2px solid var(--color-primary);
}

/* Mobile nav */
@media (max-width: 899px) {
    .nav-toggle-label {
        display: block;
    }

    .main-nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-bg);
        border-bottom: 2px solid var(--color-border);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }

    .nav-toggle:checked ~ .main-nav {
        max-height: 500px;
    }

    .nav-toggle:checked ~ .nav-toggle-label span {
        background: transparent;
    }

    .nav-toggle:checked ~ .nav-toggle-label span::before {
        top: 0;
        transform: rotate(45deg);
    }

    .nav-toggle:checked ~ .nav-toggle-label span::after {
        top: 0;
        transform: rotate(-45deg);
    }

    .main-nav ul {
        flex-direction: column;
        padding: var(--space-sm);
        gap: 0;
    }

    .main-nav a {
        padding: var(--space-xs) var(--space-sm);
    }
}

/* --- Buttons --- */
.btn {
    display: inline-block;
    padding: 0.75rem 1.75rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    text-align: center;
    transition: background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
    cursor: pointer;
    border: none;
}

.btn-cta {
    background: var(--color-cta);
    color: #fff;
}

.btn-cta:hover {
    background: var(--color-cta-hover);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: var(--shadow-card-hover);
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-outline:hover {
    background: var(--color-primary);
    color: #fff;
}

/* --- Hero --- */
.hero {
    background:
        linear-gradient(135deg, rgba(27, 77, 137, 0.82) 0%, rgba(43, 103, 119, 0.82) 100%),
        url("../img/ref-gewerbehalle.webp") center/cover no-repeat;
    color: #fff;
    padding: var(--space-xl) 0;
    text-align: center;
}

.hero h1 {
    color: #fff;
    margin-bottom: var(--space-sm);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero .subtitle {
    font-size: clamp(1.1rem, 2vw, 1.35rem);
    margin-bottom: var(--space-md);
    opacity: 0.92;
}

/* --- Sections --- */
.section {
    padding: var(--space-xl) 0;
}

.section-alt {
    background: var(--color-bg-alt);
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-lg);
}

.section-header p {
    color: var(--color-text-light);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* --- Cards --- */
.card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: var(--space-md);
    box-shadow: var(--shadow-card);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-card-hover);
}

.card-icon {
    width: 48px;
    height: 48px;
    margin-bottom: var(--space-sm);
    color: var(--color-primary);
}

.card h3 {
    margin-bottom: var(--space-xs);
}

.card p {
    color: var(--color-text-light);
    margin-bottom: var(--space-sm);
}

.card-link {
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.card-link svg {
    width: 16px;
    height: 16px;
    transition: transform 0.2s ease;
}

.card-link:hover svg {
    transform: translateX(4px);
}

/* Experten-Trio Grid */
.trio-grid {
    display: grid;
    gap: var(--space-md);
    grid-template-columns: 1fr;
}

@media (min-width: 600px) {
    .trio-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 900px) {
    .trio-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Trio card accent borders */
.card-statik {
    border-top: 4px solid var(--color-primary);
}

.card-energie {
    border-top: 4px solid var(--color-energy);
}

.card-gutachten {
    border-top: 4px solid var(--color-accent);
}

.card-statik .card-icon { color: var(--color-primary); }
.card-energie .card-icon { color: var(--color-energy); }
.card-gutachten .card-icon { color: var(--color-accent); }

/* --- 5-Schritte Prozess --- */
.steps {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.step {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
}

.step-number {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--color-primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
}

.step-content h3 {
    color: var(--color-primary);
}

.step-content p {
    color: var(--color-text-light);
    margin-bottom: 0;
}

@media (min-width: 900px) {
    .steps {
        flex-direction: row;
        max-width: 100%;
        gap: var(--space-sm);
    }

    .step {
        flex-direction: column;
        align-items: center;
        text-align: center;
        flex: 1;
        position: relative;
    }

    .step:not(:last-child)::after {
        content: "";
        position: absolute;
        top: 24px;
        left: calc(50% + 32px);
        width: calc(100% - 64px);
        height: 2px;
        background: var(--color-border);
    }
}

/* --- Trust-Leiste --- */
.trust-bar {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-md);
    align-items: flex-start;
}

.trust-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    width: 160px;
    font-size: 0.75rem;
    text-align: center;
    color: var(--color-text-light);
}

.trust-item img {
    width: 100px;
    height: 80px;
    object-fit: contain;
}

/* --- Referenzen Grid --- */
.ref-grid {
    display: grid;
    gap: var(--space-md);
    grid-template-columns: 1fr;
}

@media (min-width: 600px) {
    .ref-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 900px) {
    .ref-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.ref-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow-card);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.ref-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-card-hover);
}

.ref-card-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    display: block;
    background: var(--color-bg-alt);
}

.ref-card-body {
    padding: var(--space-sm);
}

.ref-card-body h3 {
    font-size: 1.1rem;
}

.ref-card-body p {
    color: var(--color-text-light);
    font-size: 0.9rem;
    margin-bottom: 0;
}

.ref-tag {
    display: inline-block;
    background: var(--color-bg-alt);
    color: var(--color-text-light);
    font-size: 0.75rem;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    margin-bottom: var(--space-xs);
}

/* --- Page Content (Unterseiten) --- */
.page-hero {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    color: #fff;
    padding: var(--space-lg) 0;
    text-align: center;
}

.page-hero h1 {
    color: #fff;
    margin-bottom: var(--space-xs);
}

.page-hero p {
    opacity: 0.92;
    max-width: 700px;
    margin: 0 auto;
}

.page-content {
    padding: var(--space-xl) 0;
}

.page-content h2 {
    margin-top: var(--space-lg);
    margin-bottom: var(--space-sm);
}

.page-content h2:first-child {
    margin-top: 0;
}

.page-content ul {
    list-style: none;
    margin-bottom: var(--space-md);
}

.page-content ul li {
    padding-left: 1.5rem;
    position: relative;
    margin-bottom: var(--space-xs);
}

.page-content ul li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.6em;
    width: 8px;
    height: 8px;
    background: var(--color-primary);
    border-radius: 50%;
}

/* Service detail cards */
.service-grid {
    display: grid;
    gap: var(--space-md);
    grid-template-columns: 1fr;
    margin-top: var(--space-md);
}

@media (min-width: 600px) {
    .service-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 900px) {
    .service-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* --- Kontaktseite --- */
.contact-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
    align-items: start;
}

@media (min-width: 600px) {
    .contact-layout {
        grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    }
}

/* --- Kontaktformular --- */
.contact-form {
    max-width: 700px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: var(--space-sm);
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-family: var(--font-sans);
    font-size: 1rem;
    background: var(--color-bg-card);
    color: var(--color-text);
    transition: border-color 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--color-primary);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

.form-row {
    display: grid;
    gap: var(--space-sm);
    grid-template-columns: 1fr;
}

@media (min-width: 600px) {
    .form-row {
        grid-template-columns: 1fr 1fr;
    }
}

.required-note {
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-bottom: var(--space-md);
}

/* --- Über uns --- */
.team-grid {
    display: grid;
    gap: var(--space-md);
    grid-template-columns: 1fr;
}

@media (min-width: 600px) {
    .team-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.team-member {
    text-align: center;
}

.team-photo {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    object-fit: cover;
    background: var(--color-bg-alt);
    border: 3px solid var(--color-border);
    margin: 0 auto var(--space-sm);
    display: block;
}

.timeline {
    position: relative;
    padding-left: var(--space-md);
    margin: var(--space-md) 0;
}

.timeline::before {
    content: "";
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-border);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--space-md);
}

.timeline-item::before {
    content: "";
    position: absolute;
    left: calc(-1 * var(--space-md) + 4px);
    top: 0.5em;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--color-primary);
}

.timeline-year {
    font-weight: 700;
    color: var(--color-primary);
    font-size: 0.9rem;
}

/* --- Qualifikationen-Liste --- */
.qual-list {
    display: grid;
    gap: var(--space-sm);
    grid-template-columns: 1fr;
    margin: var(--space-md) 0;
}

@media (min-width: 600px) {
    .qual-list {
        grid-template-columns: repeat(2, 1fr);
    }
}

.qual-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-xs);
    padding: var(--space-sm);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 8px;
}

.qual-item svg {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    color: var(--color-energy);
    margin-top: 2px;
}

/* --- Footer --- */
.site-footer {
    background: var(--color-primary);
    color: #fff;
    padding: var(--space-lg) 0 var(--space-md);
}

@media (prefers-color-scheme: dark) {
    .site-footer {
        background: var(--color-footer-bg);
    }
}

.footer-grid {
    display: grid;
    gap: var(--space-md);
    grid-template-columns: 1fr;
    margin-bottom: var(--space-md);
}

@media (min-width: 600px) {
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 900px) {
    .footer-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.footer-col h4 {
    color: #fff;
    font-size: 1rem;
    margin-bottom: var(--space-sm);
    opacity: 0.9;
}

.footer-col a {
    color: rgba(255, 255, 255, 0.8);
    display: block;
    padding: 0.2rem 0;
    font-size: 0.9rem;
}

.footer-col a:hover {
    color: #fff;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-xs);
    margin-bottom: var(--space-xs);
    color: var(--color-text-light);
    font-size: 0.9rem;
}

.contact-item svg {
    flex-shrink: 0;
    width: 18px;
    height: 18px;
    margin-top: 3px;
}

.site-footer .contact-item {
    color: rgba(255, 255, 255, 0.85);
}

.site-footer .contact-item svg {
    opacity: 0.8;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.15);
    padding-top: var(--space-sm);
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: var(--space-sm);
    font-size: 0.85rem;
    opacity: 0.7;
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.8);
}

.footer-bottom a:hover {
    color: #fff;
}

/* --- Legal pages --- */
.legal-content {
    padding: var(--space-lg) 0;
}

.legal-content h1 {
    margin-bottom: var(--space-md);
}

.legal-content h2 {
    margin-top: var(--space-md);
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
}

.legal-content h3 {
    font-size: 1.1rem;
    margin-top: var(--space-sm);
}

.legal-content p,
.legal-content ul {
    margin-bottom: var(--space-sm);
}

.legal-content ul li {
    padding-left: 1.5rem;
    position: relative;
    margin-bottom: var(--space-xs);
}

.legal-content ul li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.6em;
    width: 6px;
    height: 6px;
    background: var(--color-primary);
    border-radius: 50%;
}

/* --- CTA Banner --- */
.cta-banner {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    color: #fff;
    text-align: center;
    padding: var(--space-lg) 0;
}

.cta-banner h2 {
    color: #fff;
    margin-bottom: var(--space-xs);
}

.cta-banner p {
    opacity: 0.92;
    margin-bottom: var(--space-md);
}

.cta-banner .btn-cta {
    background: #fff;
    color: var(--color-primary);
}

.cta-banner .btn-cta:hover {
    background: var(--color-bg-alt);
    color: var(--color-primary-dark);
}

/* --- Utility --- */
.text-center {
    text-align: center;
}

.mt-md {
    margin-top: var(--space-md);
}

.mb-md {
    margin-bottom: var(--space-md);
}

/* --- Print --- */
@media print {
    .site-header,
    .site-footer,
    .nav-toggle-label,
    .btn {
        display: none;
    }

    body {
        color: #000;
        background: #fff;
    }
}