/* ==========================================================
   custom.css – Mobile-First Styles für Blower Door Landingpage
   ========================================================== */

/* ---- CSS Custom Properties ---- */
:root {
    --color-primary: #1a5f7a;
    --color-primary-dark: #134a5f;
    --color-primary-light: #e8f4f8;
    --color-accent: #2d9cdb;
    --color-success: #27ae60;
    --color-text: #2c3e50;
    --color-text-muted: #6c757d;
    --color-bg: #f8f9fa;
    --color-white: #ffffff;
    --color-border: #dee2e6;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --transition: 0.3s ease;
}

/* ---- Reset & Basis ---- */
* {
    -webkit-tap-highlight-color: transparent;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
}

/* ---- Header ---- */
.site-header {
    background: var(--color-white);
    box-shadow: var(--shadow-sm);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.site-header .brand {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.site-header .brand-logo {
    height: 36px;
    width: auto;
}

.site-header .btn-website {
    font-size: 0.85rem;
    padding: 6px 14px;
    border-radius: 20px;
    border: 1.5px solid var(--color-primary);
    color: var(--color-primary);
    background: transparent;
    text-decoration: none;
    transition: background var(--transition), color var(--transition);
}

.site-header .btn-website:hover,
.site-header .btn-website:focus {
    background: var(--color-primary);
    color: var(--color-white);
}

/* ---- Hero (mit Hintergrundbild) ---- */
.hero {
    position: relative;
    color: var(--color-white);
    padding: 64px 0 56px;
    text-align: center;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    min-height: 340px;
    display: flex;
    align-items: center;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(26, 95, 122, 0.88) 0%, rgba(19, 74, 95, 0.92) 100%);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero h1 {
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: 12px;
    line-height: 1.2;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.hero p {
    font-size: 1rem;
    opacity: 0.95;
    margin-bottom: 24px;
    line-height: 1.5;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
}

.hero .btn-cta {
    display: inline-block;
    background: var(--color-white);
    color: var(--color-primary);
    font-weight: 700;
    font-size: 1.05rem;
    padding: 14px 36px;
    border-radius: 50px;
    text-decoration: none;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition), box-shadow var(--transition);
}

.hero .btn-cta:hover,
.hero .btn-cta:focus {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* ---- Leistungen (Bildkarten) ---- */
.services-section {
    padding: 40px 0;
    background: var(--color-white);
}

.section-title {
    font-size: 1.3rem;
    font-weight: 700;
    text-align: center;
    color: var(--color-primary);
    margin-bottom: 24px;
}

.services-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    max-width: 560px;
    margin: 0 auto;
}

.service-card {
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    background: var(--color-bg);
    transition: transform var(--transition), box-shadow var(--transition);
}

.service-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.service-img {
    width: 100%;
    height: 180px;
    overflow: hidden;
}

.service-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.service-card:hover .service-img img {
    transform: scale(1.05);
}

.service-body {
    padding: 18px 20px 22px;
}

.service-body h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 6px;
}

.service-body p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.5;
    margin: 0;
}

/* ---- Trust Bar ---- */
.trust-bar {
    padding: 20px 0;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
}

.trust-bar .trust-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    padding: 4px 0;
}

.trust-bar .trust-item svg {
    flex-shrink: 0;
    color: var(--color-success);
}

/* ---- Formular Container ---- */
.form-section {
    padding: 32px 0 48px;
    flex: 1;
}

.form-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 28px 20px 32px;
    max-width: 520px;
    margin: 0 auto;
}

.form-card h2 {
    font-size: 1.2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 24px;
    color: var(--color-primary);
}

/* ---- Progress Bar ---- */
.progress-bar-wrapper {
    margin-bottom: 28px;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-bottom: 8px;
}

.progress {
    height: 6px;
    background: var(--color-border);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    border-radius: 3px;
    transition: width 0.4s ease;
}

/* ---- Form Steps ---- */
.form-step {
    display: none;
    animation: fadeIn 0.35s ease;
}

.form-step.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to   { opacity: 1; transform: translateY(0); }
}

.step-title {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 20px;
    text-align: center;
    color: var(--color-text);
}

/* ---- Option Cards (Objektart / Bauart) ---- */
.option-grid {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.option-card {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 18px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
    -webkit-user-select: none;
    user-select: none;
}

.option-card:hover {
    border-color: var(--color-accent);
    background: var(--color-primary-light);
}

.option-card.selected {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
    box-shadow: 0 0 0 3px rgba(26, 95, 122, 0.15);
}

.option-card input[type="radio"] {
    display: none;
}

.option-card .option-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    background: var(--color-primary-light);
    color: var(--color-primary);
    font-size: 1.3rem;
    flex-shrink: 0;
}

.option-card.selected .option-icon {
    background: var(--color-primary);
    color: var(--color-white);
}

.option-card .option-label {
    font-size: 1rem;
    font-weight: 600;
}

/* ---- Formularfelder ---- */
.form-floating-custom {
    margin-bottom: 16px;
}

.form-floating-custom label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-muted);
    margin-bottom: 6px;
    display: block;
}

.form-floating-custom input,
.form-floating-custom textarea {
    width: 100%;
    padding: 14px 16px;
    font-size: 1rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-white);
    transition: border-color var(--transition), box-shadow var(--transition);
    outline: none;
}

.form-floating-custom input:focus,
.form-floating-custom textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(26, 95, 122, 0.12);
}

.form-floating-custom input.is-invalid {
    border-color: #dc3545;
}

.form-floating-custom .invalid-feedback {
    color: #dc3545;
    font-size: 0.8rem;
    margin-top: 4px;
    display: none;
}

.form-floating-custom input.is-invalid ~ .invalid-feedback {
    display: block;
}

/* ---- Upload ---- */
.upload-area {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-md);
    padding: 28px 16px;
    text-align: center;
    cursor: pointer;
    transition: border-color var(--transition), background var(--transition);
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--color-accent);
    background: var(--color-primary-light);
}

.upload-area svg {
    color: var(--color-text-muted);
    margin-bottom: 8px;
}

.upload-area p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin: 0;
}

.upload-area .file-name {
    font-weight: 600;
    color: var(--color-primary);
    margin-top: 8px;
    font-size: 0.9rem;
}

.upload-error {
    color: #dc3545;
    font-size: 0.8rem;
    margin-top: 8px;
    text-align: center;
}

/* ---- DSGVO Checkbox ---- */
.dsgvo-check {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin: 20px 0;
}

.dsgvo-check input[type="checkbox"] {
    width: 22px;
    height: 22px;
    flex-shrink: 0;
    margin-top: 2px;
    accent-color: var(--color-primary);
    cursor: pointer;
}

.dsgvo-check label {
    font-size: 0.85rem;
    line-height: 1.5;
    color: var(--color-text-muted);
    cursor: pointer;
}

.dsgvo-check label a {
    color: var(--color-primary);
}

.dsgvo-error {
    color: #dc3545;
    font-size: 0.8rem;
    margin-top: -12px;
    margin-bottom: 12px;
    display: none;
}

/* ---- Buttons ---- */
.btn-row {
    display: flex;
    gap: 12px;
    margin-top: 24px;
}

.btn-next,
.btn-submit {
    flex: 1;
    padding: 16px 20px;
    font-size: 1.05rem;
    font-weight: 700;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition), transform var(--transition);
}

.btn-next {
    background: var(--color-primary);
    color: var(--color-white);
}

.btn-next:hover,
.btn-next:focus {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
}

.btn-next:disabled {
    background: var(--color-border);
    color: var(--color-text-muted);
    cursor: not-allowed;
    transform: none;
}

.btn-back {
    padding: 16px 20px;
    font-size: 1rem;
    font-weight: 600;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-white);
    color: var(--color-text-muted);
    cursor: pointer;
    transition: border-color var(--transition);
}

.btn-back:hover {
    border-color: var(--color-text-muted);
}

.btn-submit {
    background: var(--color-success);
    color: var(--color-white);
}

.btn-submit:hover,
.btn-submit:focus {
    background: #219a52;
    transform: translateY(-1px);
}

.btn-submit:disabled {
    background: var(--color-border);
    color: var(--color-text-muted);
    cursor: not-allowed;
    transform: none;
}

/* ---- Erfolgs-Box ---- */
.success-box {
    text-align: center;
    padding: 40px 20px;
}

.success-box .success-icon {
    width: 64px;
    height: 64px;
    background: var(--color-success);
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 1.8rem;
}

.success-box h2 {
    color: var(--color-success);
    margin-bottom: 12px;
}

.success-box p {
    color: var(--color-text-muted);
    font-size: 1rem;
    margin-bottom: 24px;
    line-height: 1.5;
}

.success-box .btn-website-lg {
    display: inline-block;
    padding: 14px 32px;
    background: var(--color-primary);
    color: var(--color-white);
    font-weight: 700;
    border-radius: 50px;
    text-decoration: none;
    transition: background var(--transition);
}

.success-box .btn-website-lg:hover {
    background: var(--color-primary-dark);
}

/* ---- Server-Fehler ---- */
.server-error {
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: var(--radius-sm);
    padding: 14px 16px;
    margin-bottom: 20px;
    font-size: 0.9rem;
    color: #dc3545;
}

/* ---- Footer ---- */
.site-footer {
    background: var(--color-white);
    border-top: 1px solid var(--color-border);
    padding: 20px 0;
    text-align: center;
    margin-top: auto;
}

.footer-contact {
    margin-bottom: 16px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--color-border);
}

.footer-contact p {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-bottom: 2px;
}

.footer-contact .footer-company {
    font-weight: 700;
    color: var(--color-text);
    font-size: 0.85rem;
    margin-bottom: 4px;
}

.footer-contact a {
    color: var(--color-primary);
    text-decoration: none;
}

.footer-contact a:hover {
    text-decoration: underline;
}

.site-footer p {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-bottom: 6px;
}

.site-footer nav a {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    text-decoration: none;
    margin: 0 8px;
}

.site-footer nav a:hover {
    color: var(--color-primary);
}

/* ---- B2B Page (architekten.php) ---- */
.b2b-hero {
    position: relative;
    color: var(--color-white);
    padding: 64px 0 56px;
    text-align: center;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    min-height: 320px;
    display: flex;
    align-items: center;
}

.b2b-hero .hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(26, 95, 122, 0.85) 0%, rgba(15, 61, 77, 0.9) 100%);
    z-index: 1;
}

.b2b-hero .hero-content {
    position: relative;
    z-index: 2;
}

.b2b-hero h1 {
    font-size: 1.6rem;
    font-weight: 800;
    margin-bottom: 12px;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.b2b-hero p {
    font-size: 1rem;
    opacity: 0.95;
    max-width: 500px;
    margin: 0 auto;
    line-height: 1.5;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
}

.b2b-section {
    padding: 32px 0;
}

.b2b-card {
    background: var(--color-white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: 24px 20px;
    max-width: 560px;
    margin: 0 auto 20px;
}

.b2b-card h2 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 16px;
}

.b2b-card ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.b2b-card ul li {
    padding: 8px 0;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 1px solid var(--color-border);
}

.b2b-card ul li:last-child {
    border-bottom: none;
}

.b2b-card ul li svg {
    color: var(--color-success);
    flex-shrink: 0;
}

.benefit-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
    max-width: 560px;
    margin: 0 auto;
}

.benefit-item {
    background: var(--color-white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: 20px;
}

.benefit-item h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 6px;
}

.benefit-item p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin: 0;
    line-height: 1.5;
}

.b2b-cta {
    text-align: center;
    padding: 32px 0 48px;
}

.b2b-cta .btn-contact {
    display: inline-block;
    padding: 16px 36px;
    background: var(--color-primary);
    color: var(--color-white);
    font-weight: 700;
    font-size: 1.05rem;
    border-radius: 50px;
    text-decoration: none;
    box-shadow: var(--shadow-md);
    transition: background var(--transition), transform var(--transition);
}

.b2b-cta .btn-contact:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
}

.b2b-cta .contact-info {
    margin-top: 16px;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.b2b-cta .contact-info a {
    color: var(--color-primary);
    text-decoration: none;
}

.back-link {
    display: inline-block;
    margin-top: 20px;
    font-size: 0.9rem;
    color: var(--color-primary);
    text-decoration: none;
}

.back-link:hover {
    text-decoration: underline;
}

/* ---- Responsive (Tablet+) ---- */
@media (min-width: 576px) {
    .hero h1 {
        font-size: 2.2rem;
    }

    .form-card {
        padding: 36px 32px 40px;
    }

    .option-grid.two-col {
        flex-direction: row;
    }

    .option-grid.two-col .option-card {
        flex: 1;
        flex-direction: column;
        text-align: center;
        padding: 20px 16px;
    }

    .benefit-grid {
        grid-template-columns: 1fr 1fr;
    }

    .services-grid {
        grid-template-columns: 1fr 1fr;
    }

    .service-img {
        height: 160px;
    }
}

@media (min-width: 768px) {
    .hero {
        padding: 80px 0 72px;
        min-height: 400px;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .hero p {
        font-size: 1.1rem;
    }

    .services-grid {
        grid-template-columns: 1fr 1fr 1fr;
        max-width: 900px;
    }

    .service-img {
        height: 180px;
    }

    .section-title {
        font-size: 1.5rem;
        margin-bottom: 32px;
    }

    .b2b-hero {
        padding: 80px 0 72px;
        min-height: 380px;
    }

    .b2b-hero h1 {
        font-size: 2rem;
    }
}