/* =============================================
   OTB ARCHITECTS — STYLES
   ============================================= */

:root {
    --primary: #121212;
    --accent: #d4af37; /* Elegance - Gold */
    --text: #f5f5f5;
    --text-dim: #a0a0a0;
    --bg-light: #ffffff;
    --transition: all 0.6s cubic-bezier(0.23, 1, 0.32, 1);
    --font-heading: 'Cormorant Garamond', serif;
    --font-body: 'Montserrat', sans-serif;
}

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

body {
    background-color: var(--primary);
    color: var(--text);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

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

/* --- NAVIGATION --- */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    padding: 2rem 0;
    transition: var(--transition);
}

nav.scrolled {
    background: rgba(18, 18, 18, 0.95);
    padding: 1rem 0;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 4rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--text);
    text-decoration: none;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 3rem;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-dim);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-weight: 500;
    transition: var(--transition);
}

.nav-links a:hover { color: var(--text); }

.nav-btn {
    border: 1px solid var(--accent);
    padding: 0.8rem 1.8rem;
    border-radius: 2px;
    color: var(--accent) !important;
}

.nav-btn:hover {
    background: var(--accent);
    color: var(--primary) !important;
}

/* --- HERO --- */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding: 0 4rem;
}

.hero-image-wrapper {
    position: absolute;
    top: 0;
    right: 0;
    width: 60%;
    height: 100%;
    z-index: 1;
}

.hero-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: grayscale(100%) contrast(110%);
    opacity: 0.8;
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, var(--primary) 15%, transparent 100%);
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
}

.label {
    display: block;
    text-transform: uppercase;
    letter-spacing: 4px;
    font-size: 0.75rem;
    margin-bottom: 2rem;
    color: var(--accent);
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition);
}

.hero h1 {
    font-family: var(--font-heading);
    font-size: clamp(3rem, 8vw, 6rem);
    line-height: 1;
    margin-bottom: 2rem;
    opacity: 0;
    transform: translateY(30px);
}

.hero h1 em { font-style: italic; }

.hero p {
    font-size: 1.1rem;
    color: var(--text-dim);
    max-width: 500px;
    margin-bottom: 3rem;
    opacity: 0;
    transform: translateY(30px);
}

.hero-actions {
    display: flex;
    gap: 2rem;
    opacity: 0;
    transform: translateY(30px);
}

.btn-primary {
    background: var(--accent);
    color: var(--primary);
    padding: 1rem 2.5rem;
    text-decoration: none;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: 0.8rem;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

.btn-primary:hover { transform: translateY(-5px); box-shadow: 0 10px 20px rgba(212, 175, 55, 0.2); }

.btn-secondary {
    border: 1px solid rgba(255,255,255,0.2);
    color: var(--text);
    padding: 1rem 2.5rem;
    text-decoration: none;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: 0.8rem;
    transition: var(--transition);
}

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

/* --- SCROLL INDICATOR --- */
.scroll-indicator {
    position: absolute;
    bottom: 3rem;
    left: 4rem;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.scroll-indicator span {
    text-transform: uppercase;
    letter-spacing: 3px;
    font-size: 0.65rem;
    writing-mode: vertical-rl;
    color: var(--text-dim);
}

.scroll-indicator .line {
    width: 1px;
    height: 60px;
    background: rgba(255,255,255,0.2);
    position: relative;
    overflow: hidden;
}

.scroll-indicator .line::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--accent);
    animation: scrollLine 2s ease-in-out infinite;
}

@keyframes scrollLine {
    0% { transform: translateY(-100%); }
    100% { transform: translateY(100%); }
}

/* --- PHILOSOPHY --- */
.philosophy { padding: 10rem 0; }

.phil-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 8rem;
    align-items: center;
}

.section-tag {
    display: block;
    text-transform: uppercase;
    letter-spacing: 5px;
    color: var(--accent);
    font-size: 0.7rem;
    margin-bottom: 2rem;
}

.phil-text h2 {
    font-family: var(--font-heading);
    font-size: 3.5rem;
    line-height: 1.1;
    margin-bottom: 2.5rem;
}

.phil-text p {
    color: var(--text-dim);
    font-size: 1.1rem;
    margin-bottom: 4rem;
}

.stats-grid {
    display: flex;
    gap: 5rem;
}

.stat h3 {
    font-family: var(--font-heading);
    font-size: 3rem;
    color: var(--accent);
}

.stat p {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-top: 0.5rem;
}

.phil-quote blockquote {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-style: italic;
    line-height: 1.3;
    margin-bottom: 2rem;
    position: relative;
}

.phil-quote cite {
    font-size: 0.9rem;
    font-style: normal;
    text-transform: uppercase;
    letter-spacing: 3px;
    color: var(--text-dim);
}

/* --- SERVICES --- */
.services {
    padding: 10rem 0;
    background-color: #1a1a1a;
}

.section-header { margin-bottom: 6rem; text-align: center; }

.section-header h2 {
    font-family: var(--font-heading);
    font-size: 4rem;
    line-height: 1;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.service-card {
    padding: 4rem 3rem;
    background: var(--primary);
    border: 1px solid rgba(255,255,255,0.03);
    transition: var(--transition);
}

.service-card:hover {
    border-color: var(--accent);
    transform: translateY(-10px);
}

.service-icon {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    color: var(--accent);
    margin-bottom: 2rem;
}

.service-card h3 {
    font-size: 1.4rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 1.5rem;
}

.service-card p { color: var(--text-dim); font-size: 0.95rem; }

/* --- PROJECTS --- */
.projects { padding: 10rem 0; }

.filter-controls {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 5rem;
}

.filter-btn {
    background: transparent;
    border: none;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 3px;
    font-size: 0.75rem;
    cursor: pointer;
    transition: var(--transition);
    padding-bottom: 0.5rem;
    border-bottom: 1px solid transparent;
}

.filter-btn.active, .filter-btn:hover {
    color: var(--accent);
    border-color: var(--accent);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.project-item {
    position: relative;
    overflow: hidden;
    height: 500px;
}

.project-image-box {
    width: 100%;
    height: 100%;
    position: relative;
    cursor: pointer;
}

.project-image-box img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: grayscale(100%);
    transition: var(--transition);
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(18, 18, 18, 0.8);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: var(--transition);
    z-index: 2;
}

.project-overlay span {
    text-transform: uppercase;
    letter-spacing: 4px;
    font-size: 0.7rem;
    margin-bottom: 1rem;
}

.project-overlay h3 {
    font-family: var(--font-heading);
    font-size: 2.5rem;
}

.project-image-box:hover img {
    transform: scale(1.1);
    filter: grayscale(0%);
}

.project-image-box:hover .project-overlay {
    opacity: 1;
}

/* --- CONTACT --- */
.contact { padding: 10rem 0; }

.contact-card {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 0;
    background: #1a1a1a;
}

.contact-info {
    padding: 6rem 4rem;
    background: var(--bg-light);
    color: var(--primary);
}

.contact-info h2 {
    font-family: var(--font-heading);
    font-size: 3.5rem;
    line-height: 1;
    margin-bottom: 2rem;
    color: var(--primary);
}

.contact-info h2 span { color: var(--accent); }

.contact-details {
    list-style: none;
    margin-top: 4rem;
}

.contact-details li {
    margin-bottom: 1.5rem;
    font-weight: 500;
    letter-spacing: 1px;
    color: var(--primary);
}

.contact-form { padding: 6rem 4rem; }

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

input, select, textarea {
    width: 100%;
    background: transparent;
    border: none;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    padding: 1rem 0;
    color: var(--text);
    font-family: var(--font-body);
    font-size: 0.9rem;
    outline: none;
    transition: var(--transition);
}

input:focus, select:focus, textarea:focus {
    border-color: var(--accent);
}

select { cursor: pointer; }
select option { background: var(--primary); }

textarea { height: 150px; resize: none; margin-top: 2rem; }

.contact-form .btn-primary { width: 100%; margin-top: 3rem; }

/* --- FOOTER --- */
footer {
    padding: 4rem 0;
    border-top: 1px solid rgba(255,255,255,0.05);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-dim);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.credits a { color: var(--accent); text-decoration: none; }

/* --- RESPONSIVE --- */
@media (max-width: 1024px) {
    .phil-grid, .contact-card { grid-template-columns: 1fr; gap: 4rem; }
    .hero { padding: 0 2rem; text-align: center; justify-content: center; }
    .hero-image-wrapper { width: 100%; opacity: 0.4; }
    .overlay { background: radial-gradient(circle, transparent 0%, var(--primary) 100%); }
    .nav-container { padding: 0 2rem; }
    .nav-links { display: none; }
    .services-grid { grid-template-columns: 1fr; }
    .projects-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .hero h1 { font-size: 3.5rem; }
    .phil-text h2 { font-size: 2.5rem; }
    .section-header h2 { font-size: 3rem; }
    .form-row { grid-template-columns: 1fr; }
}