* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    text-decoration: none;
    border: none;
    outline: none;
    scroll-behavior: smooth;
    font-family: 'Poppins', sans-serif;
}

:root {
    --bg-color: #0a0a0a;
    --second-bg-color: #131313;
    --text-color: #f0f0f0;
    --main-color: #00ffee;
    --main-color-darker: #00b8a6;
    --card-bg-color: #1a1a1a;
    --border-color: #333; /* Form elemanları için daha belirgin border */
    --input-bg-color: #222;
    --placeholder-color: #888;

    --header-height: 7rem;
    --header-height-scrolled: 6rem;

    /* Akıcı Font Boyutları */
    --fs-h2-section: clamp(3rem, 5vw + 1rem, 4.5rem);
    --fs-h3-contact: clamp(2.2rem, 3.5vw + 0.5rem, 3rem);
    --fs-p-contact: clamp(1.5rem, 2.5vw + 0.2rem, 1.8rem);
    --fs-label: clamp(1.3rem, 2vw + 0.1rem, 1.5rem);
    --fs-input: clamp(1.5rem, 2.5vw + 0.2rem, 1.7rem);
    --fs-nav: clamp(1.6rem, 2vw + 0.3rem, 1.8rem);

    /* Akıcı Boşluklar */
    --padding-section-y: clamp(7rem, 12vh, 12rem);
    --padding-section-x: clamp(2rem, 8vw, 10%);
}

html {
    font-size: 62.5%; /* 1rem = 10px */
    overflow-x: hidden;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

body.menu-open-no-scroll {
    overflow: hidden;
}

main {
    flex-grow: 1;
}

/* --- HEADER --- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    padding: 0 var(--padding-section-x);
    background: rgba(8, 8, 8, 0.7);
    backdrop-filter: blur(10px);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    transition: top 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94), height 0.3s ease, background-color 0.3s ease, box-shadow 0.3s ease;
}

.header.header-scrolled {
    height: var(--header-height-scrolled);
    background: rgba(8, 8, 8, 0.85);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.header.header-hidden {
    top: calc(-1 * var(--header-height-scrolled) - 10px);
}
.header.header-visible {
    top: 0;
}

.logo {
    font-size: clamp(2.2rem, 3vw + 0.5rem, 3rem);
    color: var(--text-color);
    font-weight: 700;
    transition: transform 0.3s ease;
}

.logo:hover {
    transform: scale(1.05);
}

.logo span {
    color: var(--main-color);
    text-shadow: 0 0 15px var(--main-color);
}

.navbar {
    display: flex;
    align-items: center;
}

.navbar a {
    font-size: var(--fs-nav);
    color: var(--text-color);
    margin-left: clamp(2rem, 4vw, 4rem);
    font-weight: 500;
    transition: color 0.3s ease, transform 0.2s ease;
    position: relative;
    padding-bottom: 0.5rem;
}

.navbar a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 3px;
    background-color: var(--main-color);
    transition: width 0.3s ease;
}

.navbar a:hover,
.navbar a.active {
    color: var(--main-color);
}

.navbar a:hover::after,
.navbar a.active::after {
    width: 100%;
}

#menu-icon {
    font-size: 3.6rem;
    color: var(--main-color);
    display: none;
    cursor: pointer;
    z-index: 1001;
    transition: transform 0.3s ease;
}
#menu-icon:hover {
    transform: scale(1.1);
}

/* --- İLETİŞİM SAYFASI ÖZEL STİLLERİ --- */
.contact-section {
    padding-top: calc(var(--header-height) + var(--padding-section-y) / 2);
    padding-bottom: var(--padding-section-y);
    padding-left: var(--padding-section-x);
    padding-right: var(--padding-section-x);
}

.section-title {
    font-size: var(--fs-h2-section);
    font-weight: 700;
    text-align: center;
    margin-bottom: calc(var(--padding-section-y) / 2.2);
    color: var(--text-color);
}
.section-title span {
    color: var(--main-color);
    text-shadow: 0 0 10px var(--main-color);
}

.contact-container {
    display: grid;
    grid-template-columns: 1fr 1.5fr; /* Sol taraf daha dar, sağ taraf form için daha geniş */
    gap: clamp(3rem, 6vw, 6rem);
    align-items: flex-start; /* İçerikleri yukarıya yasla */
    background-color: var(--card-bg-color);
    padding: clamp(3rem, 5vw, 5rem);
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
}

.contact-info-direct h3,
.contact-form-container h3 {
    font-size: var(--fs-h3-contact);
    color: var(--main-color);
    margin-bottom: 2rem;
    font-weight: 600;
}

.contact-info-direct p {
    font-size: var(--fs-p-contact);
    line-height: 1.7;
    color: #cccccc;
    margin-bottom: 2.5rem;
}

.contact-info-direct ul {
    list-style: none;
    padding: 0;
}

.contact-info-direct ul li {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 1.8rem;
    font-size: var(--fs-p-contact);
}
.contact-info-direct ul li a,
.contact-info-direct ul li span {
    color: var(--text-color);
    transition: color 0.3s ease;
}
.contact-info-direct ul li a:hover,
.contact-info-direct ul li a:hover span {
    color: var(--main-color);
}

.contact-info-direct ul li i {
    font-size: calc(var(--fs-p-contact) + 0.8rem);
    color: var(--main-color);
    min-width: 2.5rem; /* İkonlar için sabit genişlik */
    text-align: center;
}

.contact-social-icons {
    margin-top: 3rem;
    display: flex;
    gap: 1.5rem;
}
.contact-social-icons a {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 4.5rem;
    height: 4.5rem;
    background-color: var(--second-bg-color);
    color: var(--main-color);
    border-radius: 50%;
    font-size: 2.2rem;
    transition: transform 0.3s ease, background-color 0.3s ease;
    border: 1px solid var(--main-color-darker);
}
.contact-social-icons a:hover {
    transform: scale(1.15) translateY(-3px);
    background-color: var(--main-color);
    color: var(--bg-color);
    box-shadow: 0 5px 15px rgba(0,255,238,0.3);
}


/* Form Stilleri */
.contact-form-container form {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.form-group {
    position: relative;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1.8rem 1.5rem 1rem; /* Üst ve yan padding, alt padding daha az */
    background-color: var(--input-bg-color);
    color: var(--text-color);
    font-size: var(--fs-input);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    outline: none;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    resize: vertical;
}

.form-group textarea {
    min-height: 150px;
    padding-top: 1.8rem; /* Textarea için padding top */
}

.form-group label {
    position: absolute;
    top: 1.4rem; /* Input'un içinde ortalamak için */
    left: 1.6rem;
    font-size: var(--fs-label);
    color: var(--placeholder-color);
    pointer-events: none;
    transition: all 0.3s ease;
}

/* "Floating Label" efekti */
.form-group input:focus + label,
.form-group input:not(:placeholder-shown) + label,
.form-group textarea:focus + label,
.form-group textarea:not(:placeholder-shown) + label {
    top: 0.5rem;
    left: 1.2rem;
    font-size: calc(var(--fs-label) - 0.2rem);
    color: var(--main-color);
    background-color: var(--input-bg-color); /* Label'in arkasındaki metni gizlemek için */
    padding: 0 0.5rem;
    border-radius: 4px;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--main-color);
    box-shadow: 0 0 0 2px var(--main-color-darker);
}

.btn-submit {
    background-color: var(--main-color);
    color: var(--bg-color);
    padding: 1.5rem 3rem;
    border-radius: 8px;
    font-size: calc(var(--fs-input) - 0.1rem);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1); /* Daha yumuşak bir geçiş */
    border: none;
    text-transform: uppercase;
    letter-spacing: 0.1rem;
    align-self: flex-start;
    display: inline-flex;
    align-items: center;
    gap: 1rem;
    box-shadow: 0 4px 15px rgba(0, 255, 238, 0.2);
    position: relative; /* Animasyon için gerekli */
    overflow: hidden; /* Animasyon için gerekli */
}

.btn-submit::before { /* Butonun üzerine gelecek parlama efekti */
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(120deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: left 0.6s ease;
}

.btn-submit:hover::before { /* Hover'da parlama efekti aktifleşir */
    left: 100%;
}

.btn-submit i {
    font-size: 2rem;
    transition: transform 0.3s ease; /* İkon için geçiş eklendi */
}

.btn-submit:hover {
    background-color: var(--main-color-darker);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 255, 238, 0.4);
}

.btn-submit:hover i { /* Hover'da ikon hafifçe hareket eder */
    transform: translateX(5px);
}

.btn-submit:active {
    transform: translateY(0) scale(0.98); /* Tıklama anında hafif küçülme efekti */
    box-shadow: 0 2px 10px rgba(0, 255, 238, 0.3);
}

#form-status {
    margin-top: 2rem;
    text-align: left;
    font-size: 1.4rem;
    min-height: 4.5rem; /* Zıplamayı önlemek için boşluk bırak */
}

#form-status p { /* p elemanlarına opacity ve transition ekliyoruz */
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

#form-status p.visible { /* JS ile eklenecek class */
    opacity: 1;
    transform: translateY(0);
}

#form-status p.success {
    color: #4CAF50;
    font-weight: 500;
    background-color: rgba(76, 175, 80, 0.1);
    padding: 1rem;
    border-radius: 5px;
    border-left: 4px solid #4CAF50;
}

#form-status p.error {
    color: #f44336;
    font-weight: 500;
    background-color: rgba(244, 67, 54, 0.1);
    padding: 1rem;
    border-radius: 5px;
    border-left: 4px solid #f44336;
}

/* --- FOOTER (Diğer sayfalardan) --- */
.footer {
    background-color: var(--second-bg-color);
    padding: 4rem var(--padding-section-x) 2rem;
    text-align: center;
    border-top: 1px solid var(--border-color);
    margin-top: auto;
}

.social-icons-footer {
    margin-bottom: 2rem;
}

.social-icons-footer a {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 4.2rem;
    height: 4.2rem;
    background: transparent;
    border: 2px solid var(--main-color);
    font-size: 2rem;
    border-radius: 50%;
    color: var(--main-color);
    margin: 0 1rem;
    transition: all 0.3s ease-in-out;
}

.social-icons-footer a:hover {
    color: var(--bg-color);
    background-color: var(--main-color);
    transform: translateY(-5px) scale(1.1);
    box-shadow: 0 10px 20px rgba(0, 255, 238, 0.3);
}

.footer p {
    font-size: 1.4rem;
    color: #a0a0a0;
    line-height: 1.6;
}
.footer p:last-child {
    margin-top: 0.5rem;
    font-size: 1.2rem;
}
.footer p i {
    vertical-align: middle;
}


/* --- SCROLL TOP BUTTON --- */
#scrollTopBtn {
    position: fixed;
    bottom: 3rem;
    right: 3rem;
    z-index: 999;
    background-color: var(--main-color);
    color: var(--bg-color);
    border: none;
    border-radius: 50%;
    width: 5rem;
    height: 5rem;
    font-size: 2.4rem;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0, 255, 238, 0.4);
    opacity: 0;
    transform: translateY(30px);
    transition: background-color 0.3s, transform 0.3s, opacity 0.3s;
    pointer-events: none;
}

#scrollTopBtn.show {
    opacity: 0.85;
    transform: translateY(0);
    pointer-events: auto;
}

#scrollTopBtn:hover {
    background-color: var(--main-color-darker);
    transform: scale(1.1);
    opacity: 1;
}


/* --- PRELOADER --- */
#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-color);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    opacity: 1;
    visibility: visible;
    transition: opacity 0.5s ease-out, visibility 0s linear 0.5s;
}

#preloader.loaded {
    opacity: 0;
    visibility: hidden;
}

.loader-text {
    color: var(--main-color);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 600;
    margin-bottom: 20px;
    letter-spacing: 1px;
    animation: pulseText 1.5s infinite alternate;
}

.loader-spinner {
    width: 50px;
    height: 50px;
    border: 5px solid rgba(0, 255, 238, 0.3);
    border-top-color: var(--main-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulseText { from { opacity: 0.7; transform: scale(0.98); } to { opacity: 1; transform: scale(1.02); } }


/* --- MEDIA QUERIES --- */
@media (max-width: 768px) {
    #menu-icon {
        display: block;
    }
    .navbar {
        position: fixed; top: 0; left: -100%; width: 100%; height: 100vh;
        background-color: rgba(10, 10, 10, 0.98); backdrop-filter: blur(8px);
        display: flex; flex-direction: column; justify-content: center; align-items: center;
        transition: left 0.6s cubic-bezier(0.77, 0, 0.175, 1);
        padding: 0;
        z-index: 1000;
    }

    .navbar.active {
        left: 0;
        z-index: 1050;
    }

    .navbar a {
        font-size: clamp(2.2rem, 6vw, 3rem); margin: 1.8rem 0; padding: 1.2rem 2.5rem;
        display: block; text-align: center; color: var(--text-color); width: 85%;
        opacity: 0;
        transform: translateY(20px);
        transition: color 0.3s ease, background-color 0.3s ease, opacity 0.3s ease, transform 0.3s ease;
    }

    .navbar.active a {
        opacity: 1;
        transform: translateY(0);
    }
    .navbar.active a:nth-child(1) { transition-delay: 0.15s; }
    .navbar.active a:nth-child(2) { transition-delay: 0.23s; }
    .navbar.active a:nth-child(3) { transition-delay: 0.31s; }
    .navbar.active a:nth-child(4) { transition-delay: 0.39s; }

    .navbar a::after { display: none; }
    
    .navbar a:hover {
        color: var(--main-color);
        background-color: rgba(0, 255, 238, 0.08);
        border-radius: 8px;
    }
    
    .navbar a.active {
        color: var(--main-color);
        background-color: rgba(0, 255, 238, 0.15);
        border-radius: 8px;
        font-weight: 700;
        border-left: 4px solid var(--main-color);
        transform: scale(1.05);
    }

    /* İletişim Sayfası Mobil Düzenlemeleri */
    .contact-section {
        padding-top: calc(var(--header-height) + 3rem);
    }
    .section-title {
        margin-bottom: 3.5rem;
    }
    .contact-container {
        grid-template-columns: 1fr; /* Mobilde tek sütun */
        gap: 4rem; /* Sütunlar arası boşluk */
        padding: clamp(2rem, 4vw, 4rem);
    }
    .contact-info-direct {
        text-align: center;
    }
    .contact-info-direct ul li {
        justify-content: center;
    }
     .contact-social-icons {
        justify-content: center;
    }
    .btn-submit {
        align-self: center; /* Butonu mobilde ortala */
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }

    #scrollTopBtn {
        width: 4.5rem; height: 4.5rem; font-size: 2rem; bottom: 2rem; right: 2rem;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 58%;
    }
    .contact-container {
        padding: clamp(1.5rem, 3vw, 3rem);
    }
    .form-group input, .form-group textarea {
        padding: 1.6rem 1.2rem 0.8rem;
    }
    .form-group label {
        top: 1.2rem;
        left: 1.3rem;
    }
     .form-group input:focus + label,
    .form-group input:not(:placeholder-shown) + label,
    .form-group textarea:focus + label,
    .form-group textarea:not(:placeholder-shown) + label {
        top: 0.4rem;
    }
}