/* 
   KARTAL CEPHE — MODERN PREMIUM DESIGN SYSTEM 
   Architectural Excellence meets Modern Tech
*/

:root {
    /* Colors - Dark Luxe Palette */
    --bg-dark: #080808;
    --bg-surface: #121212;
    --bg-elevated: #1a1a1a;
    --accent: #D4AF37; /* Architectural Gold */
    --accent-glow: rgba(212, 175, 55, 0.4);
    --secondary: #4f46e5; /* Modern Indigo */
    --text-main: #f8f8f8;
    --text-muted: #a0a0a0;
    --text-subtle: #666666;
    --glass-bg: rgba(18, 18, 18, 0.7);
    --glass-border: rgba(255, 255, 255, 0.08);
    
    /* Typography */
    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Plus Jakarta Sans', sans-serif;
    
    /* Transitions */
    --ease-smooth: cubic-bezier(0.16, 1, 0.3, 1);
    --transition-fast: 0.3s var(--ease-smooth);
    --transition-slow: 0.6s var(--ease-smooth);
}

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

html {
    scroll-behavior: smooth;
    background-color: var(--bg-dark);
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* Typography Helpers */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    letter-spacing: -0.02em;
}

.text-gold { color: var(--accent); }
.text-gradient {
    background: linear-gradient(135deg, var(--text-main) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Premium Containers */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Modern Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 1.5rem 0;
    transition: var(--transition-slow);
}

.nav.scrolled {
    padding: 1rem 0;
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    border-bottom: 1px solid var(--glass-border);
}

.nav-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-main);
    text-decoration: none;
}

.nav-logo span { color: var(--accent); }

.nav-links {
    display: flex;
    gap: 2.5rem;
}

.nav-link {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: var(--transition-fast);
    position: relative;
}

.nav-link:hover, .nav-link.active {
    color: var(--text-main);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: var(--transition-fast);
}

.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}

/* Mobile Menu Panel */
.mobile-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    height: 100vh;
    background: var(--bg-surface);
    z-index: 2000;
    padding: 10rem 3rem 4rem;
    transition: 0.6s cubic-bezier(0.85, 0, 0.15, 1);
    display: flex;
    flex-direction: column;
    gap: 2rem;
    border-left: 1px solid var(--glass-border);
}

.mobile-nav.active {
    right: 0;
}

.mobile-nav-link {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-main);
    text-decoration: none;
    text-transform: uppercase;
    font-family: var(--font-heading);
}

.mobile-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.8);
    backdrop-filter: blur(10px);
    z-index: 1500;
    opacity: 0;
    pointer-events: none;
    transition: 0.4s;
}

.mobile-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.menu-trigger {
    display: none;
    background: none;
    border: none;
    color: var(--text-main);
    cursor: pointer;
    z-index: 2100;
}

/* Modern Buttons */
.btn-premium {
    padding: 1rem 2.5rem;
    border: 1px solid var(--accent);
    background: transparent;
    color: var(--accent);
    font-family: var(--font-heading);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: 0.75rem;
    cursor: pointer;
    transition: var(--transition-slow);
    position: relative;
    overflow: hidden;
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    text-decoration: none;
}

.btn-premium:hover {
    background: var(--accent);
    color: var(--bg-dark);
    box-shadow: 0 0 30px var(--accent-glow);
    transform: translateY(-3px);
}

/* Hero Section Refinement */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-video-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: -1;
    filter: brightness(0.4);
}

.hero-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 50%;
    background: linear-gradient(to top, var(--bg-dark), transparent);
}

.hero-content {
    position: relative;
    z-index: 10;
    max-width: 800px;
}

.hero-eyebrow {
    color: var(--accent);
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 5px;
    text-transform: uppercase;
    margin-bottom: 1.5rem;
    display: block;
}

.hero-title {
    font-size: clamp(3rem, 8vw, 6rem);
    line-height: 1;
    margin-bottom: 2rem;
}

.hero-title span {
    display: block;
    font-weight: 300;
    font-style: italic;
}.hero-title b {
    color: var(--accent);
}

/* Bento Grid System for Services/Projects */
.bento-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-auto-rows: 250px;
    gap: 1.5rem;
    margin-top: 4rem;
}

.bento-item {
    position: relative;
    background: var(--bg-surface);
    border-radius: 24px;
    overflow: hidden;
    border: 1px solid var(--glass-border);
    transition: var(--transition-slow);
}

.bento-item:hover {
    transform: scale(1.02);
    border-color: var(--accent);
}

.bento-item.tall { grid-row: span 2; }
.bento-item.wide { grid-column: span 2; }

.bento-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.6;
    transition: var(--transition-slow);
}

.bento-item:hover img {
    opacity: 0.8;
}

.bento-content {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 2rem;
    background: linear-gradient(to top, rgba(0,0,0,0.9), transparent);
}

/* Modern Card System */
.modern-card {
    background: var(--bg-elevated);
    border: 1px solid var(--glass-border);
    padding: 3rem;
    border-radius: 32px;
    transition: var(--transition-slow);
}

.modern-card:hover {
    background: var(--bg-surface);
    border-color: var(--accent);
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
}

/* Animations */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-fade-up {
    animation: fadeInUp 0.8s var(--ease-smooth) forwards;
}

/* WhatsApp Icon Modernization */
.whatsapp-modern {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 60px;
    height: 60px;
    background: #25D366;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    box-shadow: 0 10px 25px rgba(37, 211, 102, 0.4);
    transition: var(--transition-fast);
}

.whatsapp-modern:hover {
    transform: scale(1.1) rotate(15deg);
}

/* Sections */
.section {
    padding: 10rem 0;
}

.section-label {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 2rem;
    display: block;
}

.section-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    margin-bottom: 3rem;
}

/* Responsive */
@media (max-width: 1024px) {
    .bento-grid {
        grid-template-columns: repeat(2, 1fr);
        grid-auto-rows: minmax(200px, auto);
    }
    .nav-links { display: none; }
    .menu-trigger { display: block; }
}

@media (max-width: 768px) {
    .section { padding: 6rem 0; }
    .bento-grid { 
        grid-template-columns: 1fr;
        grid-auto-rows: auto;
    }
    .hero-title { font-size: 3.5rem; }
}

/* Utilities */
.bg-gold { background-color: var(--accent); }
.text-muted { color: var(--text-muted); }
.text-gold { color: var(--accent); }