/* --- GLOBAL RESET & TYPOGRAPHY --- */
:root { 
    --global-orange: #FF5500; 
    --deep-black: #0D0D0D;
    --soft-white: #FBFBFB;
    --border-color: rgba(255, 255, 255, 0.08);
    --transition-premium: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

body { 
    font-family: 'Outfit', sans-serif; 
    background: var(--deep-black); 
    color: white; 
    margin: 0; 
    padding: 0; 
    overflow-x: hidden;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

/* --- HERO & VIDEO (YAPI KORUNDU) --- */
.video-bg {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    object-fit: cover; z-index: -1;
    filter: brightness(0.35) contrast(1.1);
}

.glass-card {
    background: rgba(255, 255, 255, 0.02);
    backdrop-filter: blur(25px) saturate(160%);
    border-left: 4px solid var(--global-orange);
    padding: 60px;
    border-top: 1px solid rgba(255,255,255,0.1);
    box-shadow: 0 40px 100px rgba(0,0,0,0.5);
}

.directory-nav { border-right: 1px solid var(--border-color); }

.nav-item { 
    transition: var(--transition-premium); 
    position: relative; 
    letter-spacing: 0.15em;
}

.nav-item:hover {
    color: var(--global-orange);
    transform: translateX(5px);
}

/* --- HEADER TRANSITIONS --- */
header { transition: var(--transition-premium); }

/* SCROLLED STATE (BEYAZ HEADER) */
header.scrolled {
    background: rgba(255, 255, 255, 0.98) !important;
    backdrop-filter: blur(10px);
    box-shadow: 0 10px 40px rgba(0,0,0,0.08);
    padding-top: 1rem !important;
    padding-bottom: 1rem !important;
}

header.scrolled .nav-link-item { color: #000 !important; font-weight: 700; text-shadow: none; }
header.scrolled .text-white { color: #000 !important; }
header.scrolled .menu-trigger span { background-color: #000 !important; }

/* Header Logo Renk Değişimi */
header.scrolled .header-logo {
    filter: invert(41%) sepia(91%) saturate(4784%) hue-rotate(3deg) brightness(102%) contrast(106%);
}

/* --- SECTIONS --- */
.section-white { background: white; color: #000; padding: 140px 6%; position: relative; z-index: 10; }
.section-gray { background: #F4F4F4; color: #000; padding: 140px 6%; position: relative; z-index: 10; }

.section-title { 
    font-size: clamp(2.5rem, 5vw, 3.8rem); 
    font-weight: 800; 
    line-height: 1.1;
    letter-spacing: -0.04em;
    margin-bottom: 1.5rem; 
    color: #000;
}

.section-subtitle { 
    color: var(--global-orange); 
    font-size: 0.7rem; 
    font-weight: 800; 
    text-transform: uppercase; 
    letter-spacing: 0.4em; 
    margin-bottom: 1.2rem; 
    display: block;
}

/* --- PREMIUM CARDS (Hizmetler & Projeler) --- */
.clean-card {
    background: white; 
    border: 1px solid rgba(0,0,0,0.05); 
    padding: 70px 50px; 
    transition: var(--transition-premium);
    position: relative;
    border-radius: 0;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.clean-card::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0; width: 0; height: 4px;
    background: var(--global-orange);
    transition: var(--transition-premium);
}

.clean-card:hover { 
    transform: translateY(-15px); 
    box-shadow: 0 40px 80px rgba(0,0,0,0.08); 
    border-color: transparent;
}

.clean-card:hover::after { width: 100%; }

/* --- BUTTONS --- */
.btn-orange { 
    background: var(--global-orange); 
    color: white; 
    padding: 16px 35px;
    font-weight: 800;
    font-size: 11px;
    letter-spacing: 0.15em;
    transition: var(--transition-premium);
    border: none;
    text-transform: uppercase;
}

.btn-orange:hover { 
    background: #e64d00;
    box-shadow: 0 15px 30px rgba(255, 85, 0, 0.3);
    transform: translateY(-3px);
}

/* --- MOBILE MENU --- */
#mobile-menu { 
    position: fixed; inset: 0; background: #ffffff; z-index: 100;
    display: flex; flex-direction: column; justify-content: center; align-items: center; gap: 2rem;
    transform: translateX(100%); visibility: hidden;
    transition: var(--transition-premium);
}

#mobile-menu.active { transform: translateX(0); visibility: visible; }

.mobile-nav-link { font-size: 1.8rem; font-weight: 800; text-transform: uppercase; color: #111; transition: 0.3s; }
.mobile-nav-link:hover { color: var(--global-orange); }

/* --- ANIMATION HELPERS --- */
.header-nav-links {
    opacity: 0; transform: translate(-50%, -10px);
    pointer-events: none; transition: var(--transition-premium);
}

header.scrolled .header-nav-links { opacity: 1; transform: translate(-50%, 0); pointer-events: auto; }

@media (max-width: 768px) {
    .section-white, .section-gray { padding: 80px 6%; }
    .glass-card { padding: 30px; }
}

/* --- REFERANS SLIDER (LOGO CAROUSEL) --- */
.logo-slider {
    overflow: hidden;
    padding: 60px 0;
    background: #fff;
    white-space: nowrap;
    position: relative;
    border-top: 1px solid #eee;
    border-bottom: 1px solid #eee;
}

.logo-slider::before, .logo-slider::after {
    content: "";
    position: absolute;
    top: 0; width: 250px; height: 100%;
    z-index: 2;
}
.logo-slider::before { left: 0; background: linear-gradient(to right, white, transparent); }
.logo-slider::after { right: 0; background: linear-gradient(to left, white, transparent); }

.logo-track {
    display: inline-flex;
    animation: scroll 40s linear infinite;
    align-items: center;
}

.logo-item {
    width: 200px;
    margin: 0 40px;
    flex-shrink: 0;
    filter: grayscale(100%);
    opacity: 0.6;
    transition: 0.4s ease;
}

.logo-item:hover {
    filter: grayscale(0%);
    opacity: 1;
}

@keyframes scroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* --- REFERANS GRID (DETAY SAYFASI) --- */
.ref-card {
    background: white;
    border: 1px solid #f0f0f0;
    padding: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 160px;
    transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.ref-card:hover {
    box-shadow: 0 20px 40px rgba(0,0,0,0.05);
    border-color: var(--global-orange);
    transform: translateY(-5px);
}