:root {
    --primary-orange: #E98912;
    /* Ana Renk */
    --primary-dark: #cc5200;
    /* Koyu Turuncu (Hover için) */
    --dark-bg: #111111;
    /* Koyu Arka Plan */
    --light-bg: #f8f9fa;
    /* Açık Gri Arka Plan */
    --text-dark: #333333;
    /* Koyu Metin */
    --text-muted: #6c757d;
    /* Gri Metin */
    --white: #ffffff;
}

body {
    font-family: 'Segoe UI', 'Helvetica Neue', sans-serif;
    background-color: var(--light-bg);
    color: var(--text-dark);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    overflow-x: hidden;
}

/* --- Navbar --- */
.navbar-custom {
    background-color: rgba(17, 17, 17, 0.95);
    /* Hafif şeffaf */
    backdrop-filter: blur(10px);
    border-bottom: 3px solid var(--primary-orange);
    padding: 1rem 0;
    transition: all 0.3s ease;
}

.navbar-brand {
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--white) !important;
    letter-spacing: 1px;
}

.navbar-brand span {
    color: var(--primary-orange);
}

.nav-link {
    color: #e0e0e0 !important;
    font-weight: 500;
    transition: color 0.3s;
    margin: 0 5px;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-orange) !important;
}

/* --- Butonlar --- */
.btn-energy {
    background-color: var(--primary-orange);
    color: var(--white);
    border: none;
    font-weight: 600;
    padding: 12px 30px;
    border-radius: 50px;
    /* Daha modern yuvarlak hatlar */
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(255, 102, 0, 0.3);
}

.btn-energy:hover {
    background-color: var(--primary-dark);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 102, 0, 0.5);
}

/* --- Hero Section --- */
.hero-section {
    background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.6)), url('https://images.unsplash.com/photo-1473341304170-971dccb5ac1e?ixlib=rb-1.2.1&auto=format&fit=crop&w=1950&q=80');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    /* Parallax efekti */
    color: var(--white);
    padding: 160px 0 120px 0;
    text-align: center;
    position: relative;
}

/* --- Kartlar ve Özellikler --- */
.feature-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 15px;
    border: 1px solid #eee;
    transition: all 0.4s ease;
    height: 100%;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
    border-color: var(--primary-orange);
}

.product-card {
    border-radius: 15px;
    overflow: hidden;
    transition: all 0.3s ease;
    border: none;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

/* --- İstatistikler --- */
.stats-section {
    background-color: var(--dark-bg);
    color: var(--white);
    padding: 4rem 0;
}

/* --- Yorumlar (Testimonials) --- */
.testimonial-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    margin: 1rem;
    text-align: center;
    position: relative;
}

.testimonial-img {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 1rem;
    border: 3px solid var(--primary-orange);
}

/* --- SSS (Accordion) --- */
.accordion-button:not(.collapsed) {
    background-color: rgba(255, 102, 0, 0.1);
    color: var(--primary-orange);
    box-shadow: inset 0 -1px 0 rgba(0, 0, 0, .125);
}

.accordion-button:focus {
    border-color: var(--primary-orange);
    box-shadow: 0 0 0 0.25rem rgba(255, 102, 0, 0.25);
}

/* --- Footer --- */
footer {
    background-color: var(--dark-bg);
    color: #bbb;
    margin-top: auto;
    border-top: 5px solid var(--primary-orange);
}

footer a {
    color: #bbb;
    text-decoration: none;
    transition: 0.3s;
}

footer a:hover {
    color: #E98912;
}

/* --- Animasyon Sınıfları (JS ile tetiklenecek) --- */
.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.fade-in-up.visible {
    opacity: 1;
    transform: translateY(0);
}