:root {
    --primary-color: #00d4ff; /* Elektrik Mavisi */
    --secondary-color: #00ff88; /* Enerji Yeşili */
    --bg-dark: #0b0f19;
    --bg-light: #151b2b;
    --text-light: #f4f4f4;
    --text-gray: #b0b0b0;
    --font-heading: 'Rajdhani', sans-serif;
    --font-body: 'Roboto', sans-serif;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--bg-dark);
    color: var(--text-light);
    line-height: 1.6;
}

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 5%;
    background-color: rgba(11, 15, 25, 0.95);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-light);
    letter-spacing: 2px;
}

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

.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin-left: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-light);
    font-weight: 500;
    transition: color 0.3s;
}

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

.btn-contact {
    border: 1px solid var(--primary-color);
    padding: 0.5rem 1.5rem;
    border-radius: 5px;
    color: var(--primary-color) !important;
}

.btn-contact:hover {
    background-color: var(--primary-color);
    color: var(--bg-dark) !important;
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    background: url('bground.avif') no-repeat center center/cover;
    text-align: center;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(11,15,25,0.7), var(--bg-dark));
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    padding: 0 20px;
}

.hero-content h1 {
    font-family: var(--font-heading);
    font-size: 3.5rem;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.highlight {
    color: var(--primary-color);
}

.hero-content p {
    font-size: 1.2rem;
    color: var(--text-gray);
    margin-bottom: 2rem;
}

.badges {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.badge {
    background: rgba(255,255,255,0.1);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.9rem;
    border: 1px solid var(--secondary-color);
    color: var(--secondary-color);
}

.btn-primary {
    display: inline-block;
    background: linear-gradient(90deg, var(--primary-color), #00aaff);
    color: var(--bg-dark);
    padding: 1rem 2.5rem;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.1rem;
    transition: transform 0.3s;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 212, 255, 0.3);
}

/* Sections General */
.section-dark {
    padding: 5rem 0;
    background-color: var(--bg-dark);
}

.section-light {
    padding: 5rem 0;
    background-color: var(--bg-light);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 0.5rem;
}

.section-subtitle {
    text-align: center;
    color: var(--text-gray);
    margin-bottom: 4rem;
    font-size: 1.1rem;
}

/* Tech Section */
.tech-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    margin-bottom: 3rem;
}

.tech-video {
    position: relative;
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid rgba(0, 212, 255, 0.3);
}

.video-placeholder img {
    width: 100%;
    display: block;
    opacity: 0.6;
}

.play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 3rem;
    color: var(--text-light);
    cursor: pointer;
    z-index: 10;
}

.tech-card {
    background: rgba(255,255,255,0.03);
    padding: 2rem;
    border-radius: 10px;
    margin-bottom: 1.5rem;
    border-left: 3px solid var(--primary-color);
}

.tech-card h3 {
    font-family: var(--font-heading);
    color: var(--primary-color);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.tech-visuals {
    text-align: center;
    margin-top: 3rem;
}

.caption {
    margin-top: 1rem;
    color: var(--text-gray);
    font-size: 0.9rem;
    font-style: italic;
}

/* Tabs (Business Model) */
.tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 3rem;
    gap: 1rem;
}

.tab-btn {
    background: transparent;
    border: 1px solid var(--text-gray);
    color: var(--text-gray);
    padding: 1rem 2rem;
    cursor: pointer;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.1rem;
    transition: all 0.3s;
}

.tab-btn.active, .tab-btn:hover {
    border-color: var(--secondary-color);
    color: var(--secondary-color);
    background: rgba(0, 255, 136, 0.1);
}

.tab-content {
    display: none;
    animation: fadeIn 0.5s ease;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.content-flex {
    display: flex;
    gap: 3rem;
    align-items: center;
}

.content-flex .image img {
    width: 100%;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.content-flex ul {
    list-style: none;
    margin-top: 1.5rem;
}

.content-flex ul li {
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.1rem;
}

.content-flex ul i {
    color: var(--secondary-color);
}

/* Contact Form */
.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-top: 2rem;
    font-size: 1.2rem;
}

.contact-form .form-group {
    margin-bottom: 1.5rem;
}

.contact-form input, .contact-form select, .contact-form textarea {
    width: 100%;
    padding: 1rem;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    color: var(--text-light);
    border-radius: 5px;
    font-family: var(--font-body);
}

.contact-form input:focus, .contact-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.btn-submit {
    width: 100%;
    padding: 1rem;
    background: var(--primary-color);
    border: none;
    color: var(--bg-dark);
    font-weight: 700;
    cursor: pointer;
    font-size: 1.1rem;
}

footer {
    padding: 2rem 0;
    text-align: center;
    border-top: 1px solid rgba(255,255,255,0.05);
    color: var(--text-gray);
}

.socials {
    margin-top: 1rem;
}

.socials a {
    color: var(--text-light);
    margin: 0 10px;
    font-size: 1.2rem;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    .hero-content h1 {
        font-size: 2.5rem;
    }
    .tech-grid, .content-flex, .contact-container {
        grid-template-columns: 1fr;
    }
    .content-flex {
        flex-direction: column-reverse;
    }
}
/* Mevcut style.css dosyanın en altına ekle */

.lang-switcher a.lang-btn {
    text-decoration: none; /* Alt çizgiyi kaldır */
    color: var(--text-gray); /* Mevcut renk uyumunu koru */
    cursor: pointer;
}

.lang-switcher a.lang-btn:hover {
    color: var(--primary-color); /* Üzerine gelince parlasın */
}

/* Aktif olan dil (span) ve Link olan dil (a) için ortak ayarlar */
.lang-btn {
    font-weight: 700;
    font-size: 0.9rem;
    padding: 0 5px;
    transition: color 0.3s;
}

.lang-btn.active {
    color: var(--primary-color); /* Aktif dil mavi/parlak görünsün */
    cursor: default; /* Aktif dile tıklanamasın */
}
/* --- Whitepaper Buton Tasarımı --- */
.whitepaper-container {
    text-align: center;
    margin-bottom: 30px; /* Videodan önceki boşluk */
    margin-top: -20px; /* Başlığa yaklaştırma */
}

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 25px;
    background-color: transparent;
    border: 2px solid var(--primary-color); /* Mavi çerçeve */
    color: var(--primary-color);
    font-family: 'Rajdhani', sans-serif;
    font-weight: 700;
    font-size: 1.1rem;
    text-decoration: none;
    border-radius: 5px;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-download:hover {
    background-color: var(--primary-color);
    color: #fff; /* Üzerine gelince içi dolsun */
    box-shadow: 0 0 15px rgba(0, 212, 255, 0.4);
    transform: translateY(-2px);
}

.btn-download i {
    font-size: 1.3rem;
}

/* Mobilde butonun taşmaması için */
@media screen and (max-width: 768px) {
    .btn-download {
        font-size: 0.9rem;
        padding: 10px 20px;
        width: 80%; /* Mobilde geniş olsun */
        justify-content: center;
    }
}