:root {
    --bg-color: #0a0a0a;
    --text-primary: #f4f4f4;
    --text-secondary: #a0a0a0;
    --accent: #d4af37;
    --accent-hover: #f1c40f;
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.1);
    --input-bg: rgba(0, 0, 0, 0.2);
    --card-img-bg: #1a1a1a;
    --section-bg: #0d0d0d;
    --font-primary: 'Inter', sans-serif;
    --font-heading: 'Cinzel', serif;
}

[data-theme="light"] {
    --bg-color: #f9f9f9;
    --text-primary: #1a1a1a;
    --text-secondary: #555555;
    --glass-bg: rgba(255, 255, 255, 0.8);
    --glass-border: rgba(0, 0, 0, 0.1);
    --input-bg: rgba(255, 255, 255, 0.5);
    --card-img-bg: #e0e0e0;
    --section-bg: #f0f0f0;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.4s ease, color 0.4s ease;
}

h1, h2, h3, h4, h5, h6 { font-family: var(--font-heading); font-weight: 400; }

a { color: inherit; text-decoration: none; transition: color 0.3s ease; }
a:hover { color: var(--accent); }

/* ==================== NAVBAR ==================== */
nav {
    position: fixed; top: 0; width: 100%;
    padding: 20px 50px;
    display: flex; justify-content: space-between; align-items: center;
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    z-index: 1000;
    border-bottom: 1px solid var(--glass-border);
    transition: background 0.4s ease, border-color 0.4s ease;
}
nav .brand { font-family: var(--font-heading); font-size: 1.8rem; color: var(--accent); letter-spacing: 2px; }
nav ul { list-style: none; display: flex; gap: 30px; align-items: center; }
nav ul li a { font-size: 0.95rem; font-weight: 500; letter-spacing: 1px; text-transform: uppercase; }
#theme-toggle { cursor: pointer; font-size: 1.2rem; }

/* ==================== HERO ==================== */
.hero {
    height: 100vh;
    display: flex; flex-direction: column; justify-content: center; align-items: center;
    text-align: center; position: relative; padding: 0 20px;
    background: linear-gradient(rgba(10,10,10,0.6), rgba(10,10,10,0.85)), url('../images/hero_bg.png') center/cover no-repeat;
}
.hero h1 { font-size: 5rem; margin-bottom: 20px; color: #f4f4f4; opacity: 0; transform: translateY(30px); }
.hero p { font-size: 1.5rem; color: #d0d0d0; max-width: 600px; opacity: 0; transform: translateY(30px); }
.hero-scroll {
    position: absolute; bottom: 40px;
    display: flex; flex-direction: column; align-items: center; gap: 8px;
    color: #d0d0d0; font-size: 0.8rem; letter-spacing: 2px; text-transform: uppercase;
    animation: bounce 2s infinite;
}
.hero-scroll::after {
    content: ''; display: block; width: 1px; height: 50px;
    background: linear-gradient(to bottom, var(--accent), transparent);
}
@keyframes bounce { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-8px)} }

/* ==================== BUTTONS ==================== */
.btn {
    display: inline-block; padding: 12px 30px; margin-top: 30px;
    border: 1px solid var(--accent); color: var(--accent);
    background: transparent; border-radius: 30px;
    font-size: 1rem; text-transform: uppercase; letter-spacing: 2px;
    transition: all 0.4s ease; opacity: 0; transform: translateY(30px);
}
.btn:hover { background: var(--accent); color: #0a0a0a; }
.btn-solid {
    background: var(--accent); color: #0a0a0a;
    border: 1px solid var(--accent); border-radius: 30px;
    padding: 12px 30px; font-size: 1rem; text-transform: uppercase;
    letter-spacing: 2px; display: inline-block; transition: all 0.4s ease;
    opacity: 1; transform: none;
}
.btn-solid:hover { background: var(--accent-hover); color: #000; }

/* ==================== SECTIONS ==================== */
.section { padding: 100px 50px; }
.section-alt { padding: 100px 50px; background: var(--section-bg); }
.section-title {
    text-align: center; font-size: 2.8rem; margin-bottom: 15px; color: var(--accent);
}
.section-subtitle {
    text-align: center; color: var(--text-secondary); margin-bottom: 60px;
    font-size: 1.1rem; max-width: 600px; margin-left: auto; margin-right: auto;
}

/* ==================== STATS ==================== */
.stats-strip {
    padding: 60px 50px;
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px;
    border-top: 1px solid var(--glass-border);
    border-bottom: 1px solid var(--glass-border);
}
.stat-item { text-align: center; }
.stat-number { font-family: var(--font-heading); font-size: 3rem; color: var(--accent); display: block; }
.stat-label { color: var(--text-secondary); font-size: 0.9rem; text-transform: uppercase; letter-spacing: 1px; }

/* ==================== ABOUT ==================== */
.about-grid {
    display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center;
    max-width: 1200px; margin: 0 auto;
}
.about-img {
    width: 100%; border-radius: 15px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.5);
    border: 1px solid var(--glass-border);
}
.about-text h2 { font-size: 2.5rem; color: var(--accent); margin-bottom: 20px; }
.about-text p { color: var(--text-secondary); line-height: 1.9; margin-bottom: 20px; font-size: 1.05rem; }
.about-text .accent-line {
    width: 60px; height: 2px; background: var(--accent); margin-bottom: 30px;
}

/* ==================== CATEGORIES ==================== */
.categories-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 25px; max-width: 1200px; margin: 0 auto; }
.cat-card {
    background: var(--glass-bg); border: 1px solid var(--glass-border);
    border-radius: 15px; padding: 50px 30px; text-align: center;
    transition: all 0.4s ease; cursor: pointer;
}
.cat-card:hover { border-color: var(--accent); transform: translateY(-8px); background: rgba(212,175,55,0.05); }
.cat-icon { font-size: 3rem; margin-bottom: 20px; display: block; }
.cat-card h3 { font-size: 1.4rem; color: var(--text-primary); margin-bottom: 10px; }
.cat-card p { color: var(--text-secondary); font-size: 0.95rem; }

/* ==================== HOW IT WORKS ==================== */
.steps-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 40px; max-width: 1100px; margin: 0 auto; position: relative; }
.steps-grid::before {
    content: ''; position: absolute; top: 40px; left: 16%; right: 16%;
    height: 1px; background: linear-gradient(to right, transparent, var(--accent), transparent);
}
.step-card { text-align: center; padding: 30px; }
.step-num {
    width: 80px; height: 80px; border-radius: 50%;
    border: 2px solid var(--accent); color: var(--accent);
    font-family: var(--font-heading); font-size: 1.8rem;
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 25px; background: var(--bg-color);
    position: relative; z-index: 1;
}
.step-card h3 { font-size: 1.2rem; margin-bottom: 15px; color: var(--text-primary); }
.step-card p { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.8; }

/* ==================== GALLERY GRID ==================== */
.gallery-section { padding: 100px 50px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px,1fr)); gap: 35px; }
.card {
    background: var(--glass-bg); border: 1px solid var(--glass-border);
    border-radius: 15px; overflow: hidden;
    transition: transform 0.4s ease, box-shadow 0.4s ease, border-color 0.4s ease;
    position: relative;
}
.card:hover { transform: translateY(-8px); box-shadow: 0 20px 50px rgba(0,0,0,0.5); border-color: var(--accent); }
.card-img-wrap { position: relative; overflow: hidden; height: 320px; }
.card-img { width: 100%; height: 100%; object-fit: cover; background: var(--card-img-bg); transition: transform 0.5s ease; }
.card:hover .card-img { transform: scale(1.05); }
.card-overlay {
    position: absolute; inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.85) 0%, transparent 60%);
    opacity: 0; transition: opacity 0.4s ease;
    display: flex; flex-direction: column; justify-content: flex-end; padding: 25px;
}
.card:hover .card-overlay { opacity: 1; }
.card-overlay-title { font-family: var(--font-heading); color: #fff; font-size: 1.3rem; }
.card-overlay-price { color: var(--accent); font-size: 1.1rem; margin-top: 5px; }
.card-body { padding: 20px; }
.card-title { font-size: 1.3rem; margin-bottom: 8px; }
.card-price { color: var(--accent); font-size: 1.1rem; margin-bottom: 5px; }
.card-cat { color: var(--text-secondary); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 15px; }
.sold-badge {
    position: absolute; top: 15px; right: 15px;
    background: rgba(231,76,60,0.9); color: #fff;
    padding: 5px 14px; border-radius: 20px; font-size: 0.8rem;
    font-weight: 600; letter-spacing: 1px; text-transform: uppercase; z-index: 2;
}
.featured-badge {
    position: absolute; top: 15px; left: 15px;
    background: rgba(212,175,55,0.9); color: #000;
    padding: 5px 14px; border-radius: 20px; font-size: 0.8rem;
    font-weight: 600; letter-spacing: 1px; text-transform: uppercase; z-index: 2;
}

/* ==================== CATEGORY FILTER ==================== */
.filter-bar { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; margin-bottom: 50px; }
.filter-btn {
    padding: 10px 25px; border: 1px solid var(--glass-border);
    background: transparent; color: var(--text-secondary);
    border-radius: 30px; font-size: 0.9rem; letter-spacing: 1px;
    text-transform: uppercase; transition: all 0.3s ease; cursor: pointer;
}
.filter-btn:hover, .filter-btn.active { border-color: var(--accent); color: var(--accent); background: rgba(212,175,55,0.08); }

/* ==================== ARTWORK DETAIL ==================== */
.detail-wrap { max-width: 1300px; margin: 0 auto; padding: 120px 50px 80px; }
.detail-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 70px; align-items: start; }
.detail-img-wrap { position: sticky; top: 100px; }
.detail-img { width: 100%; border-radius: 20px; box-shadow: 0 30px 80px rgba(0,0,0,0.6); }
.detail-panel { padding-top: 20px; }
.detail-cat { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 3px; color: var(--accent); margin-bottom: 15px; }
.detail-title { font-size: 3rem; color: var(--text-primary); margin-bottom: 25px; line-height: 1.2; }
.detail-divider { width: 60px; height: 2px; background: var(--accent); margin-bottom: 25px; }
.detail-desc { color: var(--text-secondary); line-height: 1.9; font-size: 1.05rem; margin-bottom: 35px; }
.detail-price { font-family: var(--font-heading); font-size: 2.5rem; color: var(--accent); margin-bottom: 10px; }
.detail-status { display: inline-block; padding: 6px 18px; border-radius: 20px; font-size: 0.85rem; font-weight: 600; letter-spacing: 1px; text-transform: uppercase; margin-bottom: 35px; }
.status-available { background: rgba(46,204,113,0.15); color: #2ecc71; border: 1px solid #2ecc71; }
.status-sold { background: rgba(231,76,60,0.15); color: #e74c3c; border: 1px solid #e74c3c; }
.contact-form-panel {
    background: var(--glass-bg); border: 1px solid var(--glass-border);
    border-radius: 15px; padding: 35px; margin-top: 10px;
    backdrop-filter: blur(10px);
}
.contact-form-panel h3 { font-size: 1.3rem; margin-bottom: 25px; color: var(--text-primary); }
.form-input {
    width: 100%; padding: 14px; margin-bottom: 15px;
    background: var(--input-bg); border: 1px solid var(--glass-border);
    color: var(--text-primary); border-radius: 10px; font-size: 1rem;
    transition: 0.3s; box-sizing: border-box; font-family: var(--font-primary);
}
.form-input:focus { outline: none; border-color: var(--accent); background: rgba(212,175,55,0.05); }
.form-input::placeholder { color: var(--text-secondary); }
.related-section { padding: 80px 50px; }

/* ==================== CONTACT PAGE ==================== */
.contact-wrap { max-width: 1100px; margin: 0 auto; padding: 120px 50px 80px; }
.contact-grid { display: grid; grid-template-columns: 1fr 1.3fr; gap: 70px; align-items: start; }
.contact-info h2 { font-size: 2.5rem; color: var(--accent); margin-bottom: 20px; }
.contact-info .accent-line { width: 60px; height: 2px; background: var(--accent); margin-bottom: 30px; }
.contact-info p { color: var(--text-secondary); line-height: 1.9; margin-bottom: 35px; }
.contact-item { display: flex; align-items: center; gap: 15px; margin-bottom: 20px; color: var(--text-secondary); }
.contact-item-icon { font-size: 1.5rem; }
.contact-form { background: var(--glass-bg); border: 1px solid var(--glass-border); border-radius: 20px; padding: 45px; backdrop-filter: blur(15px); }
.contact-form h3 { font-size: 1.5rem; margin-bottom: 30px; color: var(--text-primary); font-family: var(--font-heading); }

/* ==================== FOOTER ==================== */
footer {
    background: rgba(0,0,0,0.5);
    border-top: 1px solid var(--glass-border);
    padding: 70px 50px 30px;
    backdrop-filter: blur(10px);
}
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 50px; margin-bottom: 50px; }
.footer-brand h3 { font-family: var(--font-heading); font-size: 1.8rem; color: var(--accent); margin-bottom: 15px; }
.footer-brand p { color: var(--text-secondary); line-height: 1.8; max-width: 280px; }
.footer-col h4 { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 2px; color: var(--text-primary); margin-bottom: 20px; }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { color: var(--text-secondary); transition: color 0.3s; }
.footer-col ul li a:hover { color: var(--accent); }
.footer-col p { color: var(--text-secondary); font-size: 0.95rem; line-height: 2; }
.footer-bottom { border-top: 1px solid var(--glass-border); padding-top: 25px; display: flex; justify-content: space-between; align-items: center; color: var(--text-secondary); font-size: 0.85rem; }

/* ==================== PAGINATION ==================== */
.pagination { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; }
.pagination .page-link { padding: 10px 18px; border: 1px solid var(--glass-border); color: var(--text-secondary); border-radius: 8px; transition: 0.3s; }
.pagination .page-link:hover, .pagination .active .page-link { border-color: var(--accent); color: var(--accent); }

/* ==================== RESPONSIVE ==================== */
@media(max-width: 900px){
    nav { padding: 15px 20px; }
    .hero h1 { font-size: 3rem; }
    .section, .section-alt { padding: 70px 25px; }
    .about-grid, .detail-grid, .contact-grid { grid-template-columns: 1fr; gap: 40px; }
    .stats-strip { grid-template-columns: repeat(2,1fr); }
    .categories-grid, .steps-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: 30px; }
    .gallery-section { padding: 80px 25px; }
    .detail-wrap, .contact-wrap { padding: 100px 25px 60px; }
}