:root {
    --art-blue: #0056b3;
    --art-dark-blue: #004085;
    --art-black: #212529;
    --art-gray: #495057;
    --art-light-gray: #f8f9fa;
    --art-white: #ffffff;
    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Roboto', sans-serif;
}
/* Design tokens */
:root {
    --radius-s: 8px;
    --radius-m: 12px;
    --radius-l: 20px;
    --shadow-s: 0 4px 15px rgba(0,0,0,0.06);
    --shadow-m: 0 10px 30px rgba(0,0,0,0.1);
    --shadow-l: 0 18px 50px rgba(0,86,179,0.18);
    --glass-bg: rgba(255,255,255,0.7);
    --glass-border: rgba(0,0,0,0.06);
    --overlay-grad: radial-gradient(1200px 600px at 20% -10%, rgba(0,86,179,0.45), transparent 60%), radial-gradient(1200px 600px at 80% 110%, rgba(0,86,179,0.35), transparent 60%);
}

/* --- Global Styles & Reset --- */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-body);
    color: var(--art-black);
    line-height: 1.6;
    background-color: var(--art-white);
}
.container { width: 90%; max-width: 1200px; margin: 0 auto; }
section { padding: 80px 0; }
h1, h2, h3 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
}
h1 { font-size: 3rem; }
h2 { font-size: 2.5rem; color: var(--art-black); }
h3 { font-size: 1.5rem; color: var(--art-blue); }
p { margin-bottom: 1rem;  }
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background-color: var(--art-blue);
    color: var(--art-white);
    padding: 15px 30px;
    border-radius: var(--radius-s);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.06rem;
    transition: background-color 0.25s ease, transform 0.12s ease, box-shadow 0.25s ease, color 0.25s ease;
    border: none;
    cursor: pointer;
    box-shadow: var(--shadow-s);
    will-change: transform;
}
.btn:hover { background-color: var(--art-dark-blue); transform: translateY(-1px); box-shadow: var(--shadow-m); }
.btn:active { transform: translateY(0); box-shadow: var(--shadow-s); }
.btn:focus-visible { outline: 3px solid rgba(0,86,179,0.35); outline-offset: 2px; }
.btn--secondary { background: transparent; color: var(--art-white); border: 1px solid rgba(255,255,255,0.6); }
.btn--secondary:hover { background: rgba(255,255,255,0.1); color: var(--art-white); border-color: rgba(255,255,255,0.9); }
.btn--ghost { background: transparent; color: var(--art-blue); border: 1px solid var(--art-blue); }
.btn--ghost:hover { background: rgba(0,86,179,0.08); }
.btn--pill { border-radius: 9999px; padding-inline: 26px; }
.section-intro { text-align: center; max-width: 800px; margin: 0 auto 30px auto; }

/* --- Sticky Header --- */
#sticky-header {
    position: fixed; top: 0; left: 0; width: 100%;
    background-color: rgba(255,255,255,0.75);
    -webkit-backdrop-filter: saturate(160%) blur(8px);
    backdrop-filter: saturate(160%) blur(8px);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: 0 4px 22px rgba(0,0,0,0.06);
    padding: 12px 5%;
    z-index: 1000; display: flex; justify-content: space-between; align-items: center;
    transform: translateY(-110%); transition: transform 300ms ease-in-out;
}
#sticky-header.visible { transform: translateY(0); }
#sticky-header .logo img { max-width: 110px; height: auto; }
#sticky-header .btn { padding: 10px 18px; font-size: 0.98rem; border-radius: 9999px; }

/* --- Header / Hero Section --- */
.hero {
    color: var(--art-white);
    padding: 140px 0 120px;
    text-align: center;
    position: relative;
    overflow: hidden;
    isolation: isolate;
}
.hero .video { position: absolute; top: 50%; left: 50%; min-width: 100%; min-height: 100%; width: auto; height: auto; z-index: -3; transform: translate(-50%,-50%); background-size: cover; object-fit: cover; }
.hero::before {
    content: ''; position: absolute; inset: 0; z-index: -2; background: var(--overlay-grad);
}
.hero::after {
    content: ''; position: absolute; inset: 0; background: rgba(0,0,0,0.6); z-index: -1;
    mix-blend-mode: multiply;
}
.hero .container { position: relative; z-index: 1; }
.hero .logo { position: absolute; top: 24px; left: 5%; z-index: 2; }
.hero .logo img { max-width: 220px; height: auto; filter: drop-shadow(0 2px 8px rgba(0,0,0,0.4)); }
 
.hero-title { font-size: clamp(2.1rem, 3.2vw + 1.6rem, 4rem); font-weight: 800; letter-spacing: -0.01em; margin-bottom: 18px; }
.hero-subtitle { font-size: clamp(1.05rem, 0.8vw + 0.8rem, 1.3rem); max-width: 760px; margin: 0 auto 34px; color: rgba(255,255,255,0.92); }
 
.cta-group { display: inline-flex; gap: 12px; flex-wrap: wrap; align-items: center; justify-content: center; margin-bottom: 24px; }
.trust-badges { display: flex; gap: 18px; justify-content: center; list-style: none; opacity: 0.92; font-weight: 500; }
.trust-badges li { display: inline-flex; align-items: center; gap: 8px; background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.15); padding: 8px 12px; border-radius: 9999px; }
.trust-badges i { color: #ffd500; }
 
/* Mobile hero adjustments */
@media (max-width: 768px) {
    .hero { padding: 100px 0 80px; }
    .hero .logo { position: static; margin-bottom: 16px; }
}
 
/* retain existing video controls hiding */
.hero .video::-webkit-media-controls,
.hero .video::-webkit-media-controls-panel,
.hero .video::-webkit-media-controls-play-button,
.hero .video::-webkit-media-controls-start-playback-button { display: none !important; }

/* --- Trust Bar / Why Choose Us Section --- */
#why-art { background-color: var(--art-light-gray); padding: 80px 0; }
.why-art-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
    text-align: center;
}
.why-art-item .icon-container {
    height: 80px;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.why-art-item .icon-container i { font-size: 3rem; color: var(--art-blue); }
.why-art-item .icon-container img { max-height: 60px; width: auto; }
.why-art-item h3 { font-size: 1.25rem; margin-bottom: 10px; color: var(--art-black); }

/* --- Product Selector Funnel --- */
#product-finder { background-color: var(--art-white); }
.finder-steps { display: flex; flex-direction: column; gap: 40px; margin-bottom: 40px; }
.finder-step { border: 1px solid #e0e0e0; border-radius: 8px; padding: 30px; background-color: #fff; box-shadow: 0 4px 15px rgba(0,0,0,0.05); }
.finder-step h3 { margin-top: 0; }
.option-buttons { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 15px; }
.option-btn {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 15px;
    background-color: var(--art-light-gray);
    border: 2px solid #ddd;
    color: var(--art-black);
    padding: 15px 20px;
    border-radius: 5px;
    cursor: pointer;
    text-align: left;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s ease;
}
.option-btn i { font-size: 1.5rem; color: var(--art-blue); width: 25px; text-align: center; }
.option-btn:hover { border-color: var(--art-blue); color: var(--art-blue); }
.option-btn.selected {
    background-color: var(--art-blue);
    color: var(--art-white);
    border-color: var(--art-blue);
}
.option-btn:focus-visible { outline: 3px solid rgba(0,86,179,0.3); outline-offset: 2px; }
.results-grid .result-card { border-radius: var(--radius-m); box-shadow: var(--shadow-s); }
.result-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-l); }
.result-card .card-content { gap: 10px; }
.result-card .badge { display: inline-block; font-size: 0.8rem; padding: 6px 10px; border-radius: 9999px; background: rgba(0,86,179,0.1); color: var(--art-blue); border: 1px solid rgba(0,86,179,0.2); }
.option-btn.selected i, .thickness-btn.selected i { color: var(--art-white); }
.steel-thickness-container { 
    display: none; 
    background-color: rgba(240, 240, 240, 0.6); 
    border-radius: 6px; 
    padding: 15px;
    margin: 10px 0 15px 40px;
    border-left: 3px solid var(--art-blue);
    max-width: 90%;
}
.steel-thickness-container.visible { 
    display: block; 
    animation: fadeIn 0.3s ease-out;
}
.steel-thickness-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 10px;
}
.thickness-btn {
    background: white;
    border: 1px solid #ddd;
    border-radius: 5px;
    padding: 10px 15px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.95rem;
    transition: all 0.2s ease;
}
.thickness-btn:hover {
    border-color: var(--art-blue);
    color: var(--art-blue);
}
.thickness-btn.selected {
    background-color: var(--art-blue);
    color: white;
    border-color: var(--art-blue);
}
@keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
@keyframes highlight-step {
    0% {
        transform: scale(1);
        box-shadow: 0 4px 15px rgba(0,0,0,0.05);
        background-color: #fff;
    }
    40% {
        transform: scale(1.02);
        box-shadow: 0 12px 45px rgba(0, 86, 179, 0.35);
        background-color: #eaf5ff;
    }
    100% {
        transform: scale(1);
        box-shadow: 0 4px 15px rgba(0,0,0,0.05);
        background-color: #fff;
    }
}
.step-highlight {
    animation: highlight-step 0.9s ease-out;
}
#step-2, #finder-results { display: none; }
/* Add scroll-margin-top to account for sticky header */
#step-2, #finder-results, #contact, #contact-info {
    scroll-margin-top: 80px; /* Approximate height of sticky header */
}
.results-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 30px; }
.result-card { border: 1px solid #e0e0e0; border-radius: 8px; overflow: hidden; display: flex; flex-direction: column; background: var(--art-white); box-shadow: 0 5px 20px rgba(0,0,0,0.07); transition: transform 0.3s ease, box-shadow 0.3s ease; }
.result-card:hover { transform: translateY(-5px); box-shadow: 0 8px 25px rgba(0,0,0,0.1); }
.result-card .card-image { overflow: hidden; }
.result-card .card-image img { width: 100%; height: auto; display: block; max-width:500px; margin: auto; }
.result-card .card-content { padding: 25px; flex-grow: 1; display: flex; flex-direction: column; }
.result-card .card-buttons { flex-wrap: wrap;;}
.result-card h4 { font-family: var(--font-heading); font-size: 1.4rem; color: var(--art-black); margin-top: 0; margin-bottom: 10px; }
.result-card .btn { margin-top: auto; width: 100%; text-align: center; justify-content: center; }
.no-results { text-align: center; padding: 40px; background: var(--art-light-gray); border-radius: 8px; }

/* --- Features Section (Software) --- */
#features { background-color: var(--art-light-gray); }
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
.feature-item { background: var(--art-white); padding: 30px; border-radius: 8px; box-shadow: 0 4px 15px rgba(0,0,0,0.05); text-align: center; }
.feature-item .feature-icon { height: 80px; margin-bottom: 20px; display: flex; align-items: center; justify-content: center; }
.feature-item .feature-icon i { font-size: 2.5rem; color: var(--art-blue); }
.feature-item .feature-icon img { max-height: 100%; max-width: 100%; border-radius: 5px; object-fit: contain; }
.feature-item h4 { font-size: 1.2rem; margin-bottom: 10px; }

.section-divider { width: 100%; height: 1px; background: linear-gradient(90deg, transparent, rgba(0,0,0,0.08), transparent); margin: 40px 0; }

/* Support visuals */
.support-wrapper { gap: 50px; }
.support-image { border-radius: var(--radius-m); box-shadow: var(--shadow-m); }

/* --- Support Section --- */
.support-wrapper { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.support-image { background-image: url('https://www.advancedrobotic.com/wp-content/uploads/2019/07/Service-tech.jpg'); background-size: cover; background-position: center; border-radius: 8px; min-height: 400px; }
.support-item { display: flex; align-items: flex-start; gap: 20px; margin-bottom: 25px; }
.support-item i { font-size: 2rem; color: var(--art-blue); flex-shrink: 0; width: 40px; text-align: center; margin-top: 5px; }
.support-item h4 { margin-bottom: 5px; color: var(--art-black); }

/* --- Testimonial Section --- */
#testimonial { background-color: var(--art-dark-blue); color: var(--art-white); }
.testimonial-content { text-align: center; max-width: 800px; margin: 0 auto; }
.testimonial-content i { font-size: 2.5rem; opacity: 0.5; margin-bottom: 20px; }
.testimonial-quote { font-size: 1.5rem; font-style: italic; line-height: 1.5; margin-bottom: 20px; }
.testimonial-author { font-size: 1.1rem; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; }

/* --- Customer Success Section --- */
#customer-success { background-color: var(--art-white); }
.customer-success-wrapper { display: grid; grid-template-columns: 1fr 1.2fr; gap: 30px; align-items: center; background-color: var(--art-light-gray); border-radius: 10px; overflow: hidden; }
.customer-success-img { height: 100%; min-height: 400px; background-image: url('https://www.advancedrobotic.com/blog/wp-content/uploads/2013/05/Progress-Air-Frank-Van-Winden-and-company-owner-Rod-Peters.jpg'); background-size: contain; background-position: center; background-repeat: no-repeat; }
.customer-success-content { padding: 40px; }
.customer-success-content h2 { margin-top: 0; }

/* --- Contact/Form Section --- */
#contact { background-color: #e9ecef; }
.form-wrapper { background: var(--art-white); padding: 50px; border-radius: var(--radius-m); box-shadow: var(--shadow-m); max-width: 860px; margin: 0 auto; }
.form-group { margin-bottom: 22px; position: relative; }
.form-group label { display: block; margin-bottom: 8px; font-weight: 600; }
.form-group input, .form-group textarea, .form-group select {
    width: 100%; padding: 14px 14px; border: 1px solid #d9dde3; border-radius: 10px; font-size: 1rem; font-family: var(--font-body); background: #fff; transition: border-color .2s, box-shadow .2s, background-color .2s, color .2s;
}
.form-group textarea { min-height: 130px; resize: vertical; }
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
    border-color: rgba(0,86,179,0.5); box-shadow: 0 0 0 4px rgba(0,86,179,0.12);
}
.form-group input.invalid, .form-group textarea.invalid, .form-group select.invalid {
    border-color: #dc3545; box-shadow: 0 0 0 4px rgba(220,53,69,.12);
}
#form-privacy { text-align: center; font-size: 0.92rem; color: var(--art-gray); margin-top: 15px; }
#form-privacy i { margin-right: 5px; }
#form-success-message { display: none; background-color: #d4edda; color: #155724; padding: 20px; border-radius: 5px; text-align: center; margin-top: 20px; font-size: 1.2rem; }
#form-error-message { display: none; background-color: #f8d7da; color: #721c24; padding: 20px; border-radius: 5px; text-align: center; margin-top: 20px; }
#form-success-message h3, #form-error-message h3 {
    color: inherit;
}
 
.progress-bar { display: flex; justify-content: space-between; margin-bottom: 40px; position: relative; }
.progress-bar::before { content: ''; position: absolute; top: 25px; left: 0; height: 4px; width: 100%; background-color: #e0e0e0; z-index: 1; }
.progress-bar::after { content: ''; position: absolute; top: 25px; left: 0; height: 4px; width: var(--progress, 0%); background-color: var(--art-blue); z-index: 2; transition: width 0.3s ease; }
.progress-step .step-icon { width: 50px; height: 50px; border-radius: 50%; background-color: #e0e0e0; color: var(--art-white); display: flex; align-items: center; justify-content: center; margin: 0 auto 10px; transition: background-color 0.3s ease, border-color 0.3s ease; border: 4px solid #e0e0e0; }
.progress-step.active .step-icon { background-color: var(--art-blue); border-color: var(--art-blue); }
.progress-step.active .step-label { color: var(--art-blue); font-weight: 700; }

/* --- Footer --- */
footer { background-color: var(--art-black); color: var(--art-light-gray); text-align: center; padding: 48px 0; border-top: 1px solid rgba(255,255,255,0.06); }
footer p { color: var(--art-light-gray); opacity: 0.9; }

/* --- Responsive Styles --- */
@media (max-width: 992px) {
    h1 { font-size: 2.5rem; }
    .hero h1 { font-size: 3rem; }
    h2 { font-size: 2rem; }
    .support-wrapper { grid-template-columns: 1fr; }
    .support-image { order: -1; min-height: 300px; }
    .customer-success-wrapper { grid-template-columns: 1fr; }
    .customer-success-img { min-height: 300px; mask-image: none; -webkit-mask-image: none; }
}
@media (min-width: 1023px) { #why-art-item-4 { display: none; } }
@media (max-width: 666px) { #why-art-item-4 { display: none; } }
@media (max-width: 768px) {
    section { padding: 60px 0; }
    #sticky-header { padding-left: 5px; }
    #sticky-header .btn { padding: 6px 12px; text-wrap: nowrap; }
    .hero { padding: 90px 0 70px; }
    .hero .logo { position: static; margin-bottom: 16px; }
    .hero h1 { font-size: 2.2rem; }
    .hero p { font-size: 1.05rem; }
    .form-wrapper { padding: 22px; }
    .option-buttons { grid-template-columns: 1fr; }
    .customer-success-content { padding: 28px; }
    #contact-form .checkbox-grid { margin-left: -15px; margin-right: -15px; }
}

/* --- Multi-Step Form Styles --- */
#contact-form {
    position: relative;
    /*overflow: hidden;*/
}

.form-step {
    display: none;
    transform: translateX(0);
    opacity: 1;
    transition: opacity 0.5s, transform 0.5s;
}

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

.form-step.exiting {
    transform: translateX(-100%);
    opacity: 0;
}

.form-step.entering {
    transform: translateX(100%);
    opacity: 0;
}

.form-buttons {
    display: flex;
    justify-content: space-between;
    margin-top: 30px;
    flex-wrap: wrap;
}
.grecaptcha-badge {
    visibility: hidden !important;
    overflow: hidden;
    height: 1px !important;
    width: 1px !important;
}

.btn-prev {
    background-color: var(--art-gray);
}

.progress-bar {
    display: flex;
    justify-content: space-between;
    margin-bottom: 40px;
    position: relative;
}

.progress-bar::before {
    content: '';
    position: absolute;
    top: 25px;
    left: 0;
    height: 4px;
    width: 100%;
    background-color: #e0e0e0;
    z-index: 1;
}

.progress-bar::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    height: 4px;
    width: 0;
    background-color: var(--art-blue);
    z-index: 2;
    transition: width 0.3s ease;
}

.progress-step {
    position: relative;
    z-index: 3;
    text-align: center;
}

.step-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: #e0e0e0;
    color: var(--art-white);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 10px;
    transition: background-color 0.3s ease, border-color 0.3s ease;
    border: 4px solid #e0e0e0;
}

.step-label {
    font-size: 0.9rem;
    color: var(--art-gray);
    transition: color 0.3s ease;
}

.progress-step.active .step-icon {
    background-color: var(--art-blue);
    border-color: var(--art-blue);
}

.progress-step.active .step-label {
    color: var(--art-blue);
    font-weight: bold;
}

.review-panel {
    background-color: var(--art-light-gray);
    padding: 20px;
    border-radius: 5px;
    margin-bottom: 20px;
}

.review-panel h4 {
    margin-top: 0;
    margin-bottom: 15px;
    border-bottom: 1px solid #ddd;
    padding-bottom: 10px;
}

#review-content p {
    margin-bottom: 8px;
}

#review-content strong {
    color: var(--art-black);
}

.form-group input.invalid {
    border-color: #dc3545;
}

/* --- Checkbox Grid Styles --- */
.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 10px;
}
@media screen and (max-width: 768px) {
    .checkbox-grid {
        grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    }
}

.checkbox-item {
    display: flex;
    align-items: center;
    background-color: var(--art-light-gray);
    border: 2px solid #ddd;
    border-radius: 5px;
    padding: 10px 15px;
    transition: all 0.2s ease;
}

.checkbox-item:hover {
    border-color: var(--art-blue);
}

.checkbox-item input[type="checkbox"] {
    display: none;
}

.checkbox-item label {
    cursor: pointer;
    width: 100%;
    margin-bottom: 0;
    color: var(--art-black);
}

.checkbox-item input[type="checkbox"]:checked + label {
    color: var(--art-white);
}

.checkbox-item input[type="checkbox"]:checked + label::before {
    content: '\f00c'; /* Font Awesome check icon */
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    margin-right: 0.5em;
    color: var(--art-white);
}
.checkbox-item input[type="checkbox"]:checked + label .svg-inline--fa {
    display: none;
}

.checkbox-item.checked {
    background-color: var(--art-blue);
    border-color: var(--art-blue);
}

.text-center {
    text-align: center;
}
.mt-1 { margin-top: 10px; }
.mt-2 { margin-top: 20px; }
.mb-2 { margin-bottom: 20px; }
.margin-auto {
    margin: 10px auto auto auto;
}

/* --- Theme Switcher --- */
#theme-switcher {
    position: fixed; top: 20px; right: 20px; z-index: 1001;
    background-color: var(--art-light-gray); color: var(--art-black);
    border: 1px solid var(--art-gray); border-radius: 50%;
    width: 50px; height: 50px; padding: 0; display: flex; align-items: center; justify-content: center;
    font-size: 1.5rem; cursor: pointer; transition: opacity .3s ease, transform .3s ease; opacity: 0; transform: translateY(-20px);
}
#theme-switcher.visible { opacity: 1; transform: translateY(0); }
#theme-switcher .fa-sun { display: none; }
#theme-switcher .fa-moon { display: block; }
 
/* --- Dark Mode --- */
html.dark { color-scheme: dark; }
html.dark:root {
    --art-blue: #ffd500; --art-dark-blue: #c2830d; --art-black: #e9ecef; --art-gray: #adb5bd; --art-light-gray: #343a40; --art-white: #212529;
    --glass-bg: rgba(33,37,41,0.7); --glass-border: rgba(255,255,255,0.06);
    --shadow-s: 0 4px 15px rgba(0,0,0,0.5); --shadow-m: 0 10px 30px rgba(0,0,0,0.55);
}
html.dark body, html.dark #product-finder { background-color: var(--art-white); color: var(--art-black); }
html.dark h2, html.dark .why-art-item h3, html.dark .result-card h4, html.dark .support-item h4 { color: var(--art-black); }
html.dark h3 { color: var(--art-blue); }
html.dark #sticky-header, html.dark .feature-item, html.dark .form-wrapper, html.dark .result-card {
    background-color: var(--art-white); box-shadow: 0 2px 10px rgba(0,0,0,0.5); border-color: var(--glass-border);
}
html.dark #sticky-header .logo img { filter: none; }
html.dark #why-art, html.dark #features, html.dark .no-results, html.dark .review-panel, html.dark .customer-success-wrapper { background-color: var(--art-light-gray); }
html.dark .finder-step { border-color: #495057; background-color: var(--art-white); }
html.dark .option-btn, html.dark .checkbox-item { background-color: var(--art-light-gray); border-color: #495057; color: var(--art-black); }
html.dark .option-btn label, html.dark .checkbox-item label { color: var(--art-black); }
html.dark .option-btn:hover, html.dark .thickness-btn:hover, html.dark .checkbox-item:hover { border-color: var(--art-blue); color: var(--art-blue); }
html.dark .option-btn.selected, html.dark .thickness-btn.selected, html.dark .checkbox-item.checked { background-color: var(--art-blue); color: var(--art-white); border-color: var(--art-blue); }
html.dark .option-btn.selected i, html.dark .thickness-btn.selected i, html.dark .checkbox-item.checked label, html.dark .checkbox-item.checked input[type="checkbox"]:checked + label::before { color: var(--art-white); }
html.dark .steel-thickness-container { background-color: rgba(33,37,41,0.6); border-left-color: var(--art-blue); }
html.dark .thickness-btn { background: #343a40; border-color: #495057; color: var(--art-black); }
html.dark #testimonial { background-color: var(--art-dark-blue); color: var(--art-black); }
html.dark #contact { background-color: #1c1c1c; }
html.dark .form-group label { color: var(--art-black); }
html.dark .form-group label small, html.dark #form-privacy, html.dark footer, html.dark footer p, html.dark .step-label { color: var(--art-gray); }
html.dark .form-group input, html.dark .form-group textarea, html.dark .form-group select { background-color: var(--art-light-gray); border-color: #495057; color: var(--art-black); }
html.dark footer { background-color: #121212; border-top-color: rgba(255,255,255,0.08); }
html.dark .progress-bar::before, html.dark .step-icon { background-color: #495057; }
html.dark .step-icon { border-color: #495057; }
html.dark .progress-step.active .step-icon { background-color: var(--art-blue); border-color: var(--art-blue); }
html.dark .progress-step.active .step-label { color: var(--art-blue); }
html.dark #review-content strong { color: var(--art-black); }
html.dark #contact-info { background-color: rgba(255, 255, 255, 0.05) !important; }
html.dark .hero, html.dark .hero h1, html.dark .hero p { color: #fff; }
html.dark #contact-info h3 { color: #e9ecef !important; }
html.dark #contact-info p, html.dark #contact-info a { color: var(--art-gray) !important; }
html.dark #theme-switcher { background-color: var(--art-light-gray); color: var(--art-black); border-color: var(--art-gray); }
html #sticky-header .logo img { filter: invert(1); }
html.dark #sticky-header .logo img { filter: invert(0); }
 
/* Accessibility */
:focus-visible { outline-offset: 2px; }
 
/* Motion safety */
@media (prefers-reduced-motion: reduce) {
    * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}