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/* DEĞİŞKENLER & RESET                                                        */
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@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=Montserrat:wght@600;700;800&display=swap');

:root {
    --color-primary: #00629B;
    --color-accent: #862633;
    --color-secondary: #5F2167;
    --color-text-dark: #1A1A1A;
    --color-text-light: #FFFFFF;
    --color-bg-light: #F8F9FA;
    --color-bg-white: #FFFFFF;
    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Inter', sans-serif;
    --container-width: 1200px;
    --header-height: 80px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--font-body); color: var(--color-text-dark); background-color: var(--color-bg-white); line-height: 1.6; overflow-x: hidden; }
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; transition: all 0.3s ease; }
ul { list-style: none; }
.container { width: 90%; max-width: var(--container-width); margin: 0 auto; padding: 0 1rem; }

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/* HEADER & NAVIGATION                                                        */
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.site-header { 
    position: sticky; 
    top: 0; 
    background-color: rgba(255, 255, 255, 0.95); 
    backdrop-filter: blur(10px); 
    height: var(--header-height); 
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05); 
    z-index: 1000; 
    display: flex; 
    align-items: center; 
}

.site-header__container { 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    width: 100%; 
    gap: 10px;
}

.site-header__logo img { 
    height: 50px; 
    width: auto; 
    object-fit: contain; 
}

.site-nav__list { display: flex; gap: 2rem; }
.site-nav__link { font-weight: 500; color: var(--color-text-dark); position: relative; padding-bottom: 4px; }
.site-nav__link:hover { color: var(--color-accent); }
.site-nav__link::after { content: ''; position: absolute; bottom: 0; left: 0; width: 100%; height: 2px; background-color: var(--color-accent); transform: scaleX(0); transform-origin: right; transition: transform 0.3s ease-out; }
.site-nav__link:hover::after { transform: scaleX(1); transform-origin: left; }

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/* HEADER RIGHT (ATATÜRK, BAYRAK, TOGGLE)                                     */
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.site-header__right { 
    display: flex; 
    align-items: center; 
    gap: 1.5rem; 
    flex-shrink: 0; /* Mobilde daralmayı engeller */
}

.site-header__ataturk {
    height: 48px;
    width: auto;
    border-radius: 6px;
    object-fit: contain;
    box-shadow: 0 4px 8px rgba(0, 98, 155, 0.25);
    transition: transform 0.3s ease;
}

.site-header__ataturk:hover { transform: scale(1.05); }

.site-header__flag { 
    height: 48px; 
    width: auto; 
    border-radius: 2px; 
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2); 
}

.site-header__toggle { 
    display: none; 
    background: none; 
    border: none; 
    cursor: pointer; 
    width: 30px; 
    height: 20px; 
    position: relative; 
    z-index: 1001; 
    flex-shrink: 0; /* Butonun ezilmesini engeller */
}

.site-header__toggle-icon, .site-header__toggle-icon::before, .site-header__toggle-icon::after { 
    display: block; 
    width: 100%; 
    height: 2px; 
    background-color: var(--color-primary); 
    position: absolute; 
    transition: all 0.3s ease; 
}

.site-header__toggle-icon { top: 9px; } 
.site-header__toggle-icon::before { content: ''; top: -9px; } 
.site-header__toggle-icon::after { content: ''; top: 9px; }

/* -------------------------------------------------------------------------- */
/* HERO SECTION                                                               */
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.hero { 
    min-height: calc(100vh - var(--header-height)); 
    display: flex; 
    align-items: center; 
    color: var(--color-text-light); 
    padding: 4rem 0; 
    text-align: center; 
}

.hero__container { display: flex; flex-direction: column; align-items: center; gap: 2rem; max-width: 900px; margin: 0 auto; }
.hero__title { font-family: var(--font-heading); font-size: 3rem; font-weight: 800; line-height: 1.2; color: var(--color-text-light); }
.hero__media { width: 100%; max-width: 800px; margin: 1rem 0; }
.hero__image { border-radius: 20px; box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4); object-fit: cover; width: 100%; height: auto; }
.hero__content { display: flex; flex-direction: column; align-items: center; gap: 2rem; }
.hero__description { font-size: 1.25rem; opacity: 0.95; max-width: 600px; line-height: 1.6; }
.hero__actions { display: flex; gap: 1.5rem; justify-content: center; }

/* -------------------------------------------------------------------------- */
/* TAKIM HAKKINDA (ABOUT BOX)                                                 */
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.hero__about-box {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 16px;
    padding: 2.5rem;
    margin-bottom: 2.5rem;
    max-width: 900px;
    width: 100%;
    text-align: center;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.1);
}

.hero__about-title {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: #FFFFFF;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.hero__about-text p {
    font-size: 1.05rem;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.95);
    margin-bottom: 1rem;
    text-align: justify;
    text-align-last: center;
}

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/* BUTON STİLLERİ                                                             */
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.btn { display: inline-flex; justify-content: center; align-items: center; padding: 1rem 2.5rem; font-weight: 600; border-radius: 8px; cursor: pointer; font-size: 1rem; transition: all 0.3s ease; }
.btn--primary { background-color: var(--color-accent); color: var(--color-text-light); border: 2px solid var(--color-accent); }
.btn--primary:hover { transform: scale(1.05); background-color: #6a1e28; border-color: #6a1e28; }
.btn--secondary { background-color: transparent; border: 2px solid var(--color-text-light); color: var(--color-text-light); }
.btn--secondary:hover { background-color: var(--color-text-light); color: var(--color-primary); }

/* -------------------------------------------------------------------------- */
/* SPONSOR MARQUEE (KAYAN YAZI)                                               */
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.sponsors-marquee-section {
    padding: 1.5rem 0;
    background-color: var(--color-bg-light);
    overflow: hidden;
    border-top: 1px solid rgba(0,0,0,0.05);
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

.marquee-container { width: 100%; overflow: hidden; white-space: nowrap; }
.marquee-content { display: inline-block; padding-left: 100%; animation: marqueeScroll 35s linear infinite; }
.marquee-content span { font-family: var(--font-heading); font-size: 1.2rem; font-weight: 600; color: var(--color-primary); margin-right: 4rem; display: inline-block; }
.marquee-container:hover .marquee-content { animation-play-state: paused; }
@keyframes marqueeScroll { 0% { transform: translateX(0); } 100% { transform: translateX(-100%); } }

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/* FOOTER                                                                     */
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.site-footer { background-color: var(--color-secondary); color: var(--color-text-light); padding: 4rem 0 2rem; }
.site-footer__container { display: flex; flex-direction: column; align-items: center; gap: 2rem; text-align: center; }
.site-footer__social { display: flex; gap: 1.5rem; }
.social-link { padding: 0.5rem 1rem; border: 1px solid rgba(255,255,255,0.2); border-radius: 8px; }
.social-link:hover { background-color: #fff; color: var(--color-primary); }
.site-footer__copyright { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 1.5rem; width: 100%; font-size: 0.875rem; opacity: 0.6; }

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/* GLOBAL UTILITY: ANIMATED BACKGROUND                                        */
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.ieee-animated-bg {
    background: linear-gradient(-45deg, var(--color-primary), var(--color-secondary), var(--color-accent), var(--color-primary));
    background-size: 400% 400%;
    animation: ieeeGradientFlow 15s ease infinite;
    will-change: background-position;
    width: 100%;
}

@keyframes ieeeGradientFlow {
    0% { background-position: 100% 100%; }
    50% { background-position: 0% 0%; }
    100% { background-position: 100% 100%; }
}

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/* MODAL (POPUP)                                                              */
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.modal { position: fixed; top: 0; left: 0; width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; z-index: 9999; opacity: 0; visibility: hidden; transition: all 0.3s ease-in-out; }
.modal.is-visible { opacity: 1; visibility: visible; }
.modal__overlay { position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0, 0, 0, 0.6); backdrop-filter: blur(5px); cursor: pointer; }
.modal__container { background: #FFFFFF; width: 90%; max-width: 600px; border-radius: 12px; padding: 2rem; box-shadow: 0 20px 50px rgba(0,0,0,0.3); position: relative; z-index: 1; transform: translateY(20px); transition: transform 0.3s ease; }
.modal.is-visible .modal__container { transform: translateY(0); }
.modal__header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1.5rem; border-bottom: 1px solid #eee; padding-bottom: 1rem; }
.modal__title { font-family: var(--font-heading); color: var(--color-primary); font-size: 1.5rem; font-weight: 700; }
.modal__close { background: transparent; border: none; font-size: 2rem; line-height: 1; color: #999; cursor: pointer; transition: color 0.3s; }
.modal__close:hover { color: var(--color-accent); }
.modal__content { font-size: 1rem; color: #444; line-height: 1.6; margin-bottom: 2rem; }
.modal__footer { text-align: right; }

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/* RESPONSIVE OPTİMİZASYONLARI                                                */
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@media (max-width: 992px) { 
    .hero__title { font-size: 2.5rem; } 
}

@media (max-width: 768px) {
    /* Mobil Header Ayarları */
    .site-header {
        height: 65px; /* Kompakt header */
        padding: 0 5px;
    }

    .site-header__logo img {
        height: 35px; /* Mobilde IEEE logo küçültüldü */
    }

    .site-header__right {
        gap: 0.5rem; /* İkonlar arası boşluk daraltıldı */
    }

    .site-header__ataturk, 
    .site-header__flag {
        height: 32px !important; /* Mobilde görseller optimize edildi */
    }

    .site-header__toggle { 
        display: block; 
        z-index: 1002; /* Her zaman üstte kalsın */
    }

    /* Mobil Navigasyon */
    .site-nav { 
        display: none; 
        position: absolute; 
        top: 100%; 
        left: 0; 
        width: 100%; 
        background-color: var(--color-bg-white); 
        box-shadow: 0 10px 20px rgba(0,0,0,0.1); 
        border-top: 1px solid #eee; 
    }
    .site-nav.site-nav--active { display: block; padding: 1.5rem 0; animation: slideDown 0.3s ease-out; }
    .site-nav__list { flex-direction: column; align-items: center; gap: 1.5rem; }
    @keyframes slideDown { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }

    /* Hero & About Mobil */
    .hero__title { font-size: 1.8rem; }
    .hero__description { font-size: 1rem; }
    .hero__about-box { padding: 1.5rem; }
    .hero__about-title { font-size: 1.5rem; }
    .hero__about-text p { font-size: 0.95rem; text-align: left; text-align-last: left; }
    .hero__actions { flex-direction: column; width: 100%; max-width: 300px; }
    .btn { width: 100%; }

    .ieee-animated-bg { animation-duration: 25s; }
}

@media (prefers-reduced-motion: reduce) {
    .ieee-animated-bg { animation: none; background-position: 0% 50%; }
}