:root {
    --primary-color: #ff0000;
    --primary-dark: #990000;

    --text-light: #ffffff;
    --text-gray: #cccccc;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #050c17, #030d19, #04122b, #061b40);
    color: var(--text-light);
    line-height: 1.6;
}

header {
    padding: 10px;
    background-color: #03070fb7;
    position: fixed;
    width: 100%;
    z-index: 1000;
    justify-content: center;
    display: flex;
    align-items: center;
}

.logo-img {
    height: 80px;   
    margin-left: 20px; 
}

.girisbuton {
    margin-left: auto; /* Butonu sağa iter */
}

.giris-btn {
    display: inline-block;
    margin-right: 40px;
    background-color: var(--primary-color); /* Ana renk */
    color: #fff;
    font-size: 16px;
    font-weight: bold;
    text-decoration: none;
    padding: 10px 20px;
    border-radius: 20px;
    transition: all 0.3s ease; /* Hover için yumuşak geçiş */
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    

}

/* Hover Efekti */
.giris-btn:hover {
    background-color: transparent;
    border: 2px solid var(--primary-color);
    box-shadow: 0 6px 8px rgba(0, 0, 0, 0.2);
}

.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-content {
    margin-top: 200px;
    margin-bottom: 3rem;
    z-index: 2;
}

h1 {
    font-size: 4.5rem;
    margin-bottom: 1rem;
    color: var(--text-light);
    font-weight: 700;
    letter-spacing: 1px;
}

h2 {
    font-size: 2.5rem;
    color: var(--text-gray);
    margin-bottom: 2rem;
    font-weight: 500;
}

.download-buttons {
    display: flex;
    gap: 30px;
    justify-content: center;
    flex-wrap: wrap;
}

.download-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    flex: 0 1 auto;
    padding: 20px 40px;
    border-radius: 40px;
    background-color: var(--primary-color);
    color: var(--text-light);
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: bold;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.download-btn:hover {
    background-color: transparent;
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.download-btn i {
    font-size: 2rem;
}

.hero-phones {
    display: flex;
    margin-top: 3rem;
    position: relative;
    z-index: 1;
    gap: 30px;
}

.phone-container {
    position: relative;
    width: 400px;
}

.phone-img {
    width: 100%;
    height: auto;
    position: relative;
    z-index: 2;
    filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.3));
}

.installation-guide {
    padding: 6rem 2rem;
    background-color: rgba(0, 0, 0, 0.3);
    margin-top: 40px;
}

.installation-guide h2 {
    color: #e8e8e8;
    font-size: 3rem;
    font-weight: 900;
    text-align: center;
}

.guide-subtitle {
    color: var(--text-gray);
    text-align: center;
    margin-bottom: 3rem;
    font-size: 1.5rem;
}

.steps-container {
    display: flex;
    flex-wrap: wrap;
    gap: 4rem;
    justify-content: center;
    margin-top: 3rem;
    max-width: 1400px;
    margin-left: auto;
    margin-right: auto;
    margin-top: 60px;
}

.step {
    flex: 1;
    min-width: 400px;
    max-width: 450px;
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    padding: 2rem;
    text-align: center;
    backdrop-filter: blur(10px);
    margin-top: 40px;
}

.step p{
    font-size: 1.2rem;
    color: #868686;
}

.step-number {
    width: 60px;
    height: 60px;
    background-color: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-weight: bold;
    font-size: 1.3rem;
}

.step h3 {
    color: #cccccc;
    margin-bottom: 1rem;
    font-size: 1.6rem;
}

.step p {
    color: var(--text-gray);
    margin-bottom: 20px;
}

.step-img {
    width: 100%;
    max-width: 300px;
    height: auto;
    margin-top: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

footer {
    text-align: center;
    padding: 2rem;
    background-color: #091122;
    color: var(--text-gray);
    font-size: 1.2rem;
}

@media (max-width: 768px) {
    .logo-img {
        height: 60px;  
        margin-top: 10px;  
    }

    .giris-btn {
        display: inline-block;
        margin-right: 10px;
        background-color: var(--primary-color); 
        color: #fff;
        font-size: 16px;
        font-weight: bold;
        text-decoration: none;
        padding: 10px 20px;
        border-radius: 20px;
        transition: all 0.3s ease;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);  
    
    
    }

    .hero-content {
        margin-top: 120px;
    }

    h1 {
        font-size: 2.4rem;
    }

    h2 {
        font-size: 1.2rem;
    }

    .download-buttons {
        gap: 20px;
        flex-direction: column;
        width: 100%;
        padding: 0 5px;
    }

    .download-btn {
        padding: 15px 20px;
        font-size: 16px;
    }

    .download-btn i {
        font-size: 24px;
    }

    .hero-phones {
        flex-direction: column;
        align-items: center;
    }

    .phone-img {
        width: 100%;
        height: auto;
        position: relative;
        z-index: 2;
        filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.3));
        gap: 20px;
    }

    .phone-container {
        width: 580px;
    }

    .installation-guide {
        padding: 3rem 1rem;
    }

    .installation-guide h2 {
        font-size: 1.2rem;
        margin-bottom: 1rem;
    }

    .guide-subtitle {
        font-size: 1rem;
        margin-bottom: 2rem;
    }

    .steps-container {
        gap: 2rem;
        margin-top: 40px;
    }

    .step {
        min-width: 100%;
        margin-top: 30px;
        padding: 1.5rem;
    }

    .step h3 {
        font-size: 1.4rem;
    }

    .step p {
        font-size: 1rem;
        margin-bottom: 20px;
    }

    .step-number {
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
        margin-bottom: 1rem;
    }

    .step-img {
        max-width: 60%;
        margin-top: 20px;
    }

    footer {
        font-size: 1rem;
        padding: 1rem;
    }
}

/* Tablet için ek optimizasyonlar */
@media (min-width: 769px) and (max-width: 1024px) {
    .logo-img {
        height: 80px; 
       
    }

    .hero-content {
        margin-top: 180px;
    }

    h1 {
        font-size: 3.5rem;
    }

    h2 {
        font-size: 2rem;
    }

    .download-btn {
        padding: 20px 40px;
        font-size: 1.3rem;
    }

    .download-btn i {
        font-size: 1.8rem;
    }

    .phone-container {
        width: 450px;
    }

    .installation-guide h2 {
        font-size: 2.8rem;
    }

    .guide-subtitle {
        font-size: 1.4rem;
    }

    .step {
        min-width: 45%;
    }

    .step h3 {
        font-size: 1.6rem;
    }

    .step p {
        font-size: 1.1rem;
    }
}