/* Genel Ayarlamalar ve YENİ Renk Paleti (Verdiğiniz renkler) */
:root {
    --deep-purple: #441752;       /* En Koyu Mor - Başlıklar, Ana Buton, Koyu Metin */
    --medium-lavender: #8174A0;   /* Orta Mor - Navbar, Footer, İkincil Buton */
    --light-mauve: #A888B5;       /* Açık Mor - Navbar Scroll, Hover Arka Plan */
    --light-pink: #EFB6C8;        /* En Açık Pembe/Mor - Ana Arka Plan */

    /* Kullanım kolaylığı için genel renkler */
    --text-on-light-bg: var(--deep-purple); /* Açık arka planlarda koyu metin */
    --text-on-dark-bg: #FFFFFF;             /* Koyu arka planlarda beyaz metin */

    /* Özel kullanım alanları */
    --bg-main: var(--light-pink);
    --navbar-bg-default: var(--medium-lavender);
    --navbar-bg-scrolled: var(--light-mauve); /* Scroll olunca hafif farklı bir ton */
    
    --logo-color: var(--deep-purple);
    --hero-heading-color: var(--deep-purple);
    --hero-description-color: var(--deep-purple);

    --nav-item-default-text: var(--text-on-light-bg);
    --nav-item-hover-bg: var(--deep-purple);
    --nav-item-hover-text: var(--text-on-dark-bg);

    --lms-btn-bg: var(--deep-purple);
    --lms-btn-text: var(--text-on-dark-bg);
    --lms-btn-hover-bg: #5D236C; /* Deep purple'ın hafif koyusu */

    --lecturer-btn-bg: var(--light-mauve);
    --lecturer-btn-text: var(--text-on-light-bg);
    --lecturer-btn-hover-bg: #8E7B9C; /* Light mauve'un hafif koyusu */

    --box-shadow-light: rgba(0, 0, 0, 0.1);
    --box-shadow-strong: rgba(0, 0, 0, 0.25);
}

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

body {
    font-family: 'Montserrat', sans-serif;
    background-color: var(--bg-main); /* En açık renk */
    color: var(--text-on-light-bg); /* Koyu metin */
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* Navbar */
.navbar {
    background-color: var(--navbar-bg-default);
    padding: 1rem 0;
    box-shadow: 0 4px 15px var(--box-shadow-light);
    position: fixed;
    width: 100%;
    z-index: 1000;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar .logo {
    color: var(--logo-color);
    font-size: 1.8rem;
    font-weight: bold;
    text-decoration: none;
    letter-spacing: 1px;
}

.navbar ul {
    list-style: none;
    display: flex;
    gap: 15px; /* Menü öğeleri arası boşluk */
}

/* Navigasyon Butonları (Anasayfa ve Demo Butonları) */
.navbar .nav-item {
    color: var(--nav-item-default-text);
    text-decoration: none;
    padding: 10px 15px;
    border-radius: 5px;
    transition: background-color 0.3s ease, transform 0.2s ease, color 0.3s ease;
    font-size: 1rem;
    font-weight: 500;
    min-width: 160px; /* Tüm butonların minimum genişliği, eşit durmalarını sağlar */
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    border: none;
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05); /* Butonlara hafif gölge */
}

.navbar .nav-item:hover,
.navbar .nav-item.active {
    background-color: var(--nav-item-hover-bg);
    color: var(--nav-item-hover-text);
    transform: translateY(-2px);
    box-shadow: 0 4px 10px var(--box-shadow-light);
}

/* Demo Butonları Özelleştirmesi */
.navbar .demo-btn {
    font-weight: bold;
    letter-spacing: 0.5px;
}

.navbar .lms-btn {
    background-color: var(--lms-btn-bg);
    color: var(--lms-btn-text);
    box-shadow: 0 2px 8px var(--box-shadow-strong);
}

.navbar .lms-btn:hover {
    background-color: var(--lms-btn-hover-bg);
    box-shadow: 0 4px 12px var(--box-shadow-strong);
}

.navbar .lecturer-btn {
    background-color: var(--lecturer-btn-bg);
    color: var(--lecturer-btn-text);
    box-shadow: 0 2px 8px var(--box-shadow-light);
}

.navbar .lecturer-btn:hover {
    background-color: var(--lecturer-btn-hover-bg);
    box-shadow: 0 4px 12px var(--box-shadow-strong);
}

/* Hero Section (Ana Bölüm) */
.hero-section {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding-top: 80px;
    position: relative;
    overflow: hidden;
}

/* Arka plan efekti */
.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /* Yeni renk paleti ile gradyan */
    background: radial-gradient(circle at center, var(--bg-main) 0%, var(--light-mauve) 70%, var(--bg-main) 100%);
    opacity: 0.7;
    animation: pulseBackground 10s infinite alternate;
}

@keyframes pulseBackground {
    0% { transform: scale(1); opacity: 0.7; }
    100% { transform: scale(1.05); opacity: 0.8; }
}

.hero-section .container {
    z-index: 1;
}

.hero-title {
    font-family: 'Playfair Display', serif;
    font-size: 5.5rem;
    color: var(--hero-heading-color);
    margin-bottom: 10px;
    letter-spacing: 3px;
    text-shadow: 0 0 15px rgba(68, 23, 82, 0.3), 0 0 30px rgba(68, 23, 82, 0.15); /* Gölge efekti renk paletine uygun */
    animation: fadeInDown 1.5s ease-out;
}

.hero-subtitle {
    font-size: 3rem;
    color: var(--hero-heading-color);
    margin-bottom: 30px;
    letter-spacing: 1.5px;
    opacity: 0.9;
    animation: fadeIn 2s ease-out 0.5s forwards;
    opacity: 0;
}

.hero-description {
    font-size: 1.4rem;
    max-width: 700px;
    margin: 0 auto;
    color: var(--hero-description-color);
    animation: fadeIn 2s ease-out 1s forwards;
    opacity: 0;
}

/* Animasyonlar (Değişiklik Yok) */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}


/* Footer */
.footer {
    background-color: var(--navbar-bg-default);
    color: var(--text-on-light-bg);
    padding: 1.5rem 0;
    text-align: center;
    font-size: 0.9rem;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
}

/* Responsive Tasarım */
@media (max-width: 992px) {
    .navbar ul {
        gap: 10px;
    }
    .navbar .nav-item {
        min-width: 140px; /* Buton minimum genişliği azaltıldı */
    }
    .hero-title {
        font-size: 4.5rem;
    }
    .hero-subtitle {
        font-size: 2.5rem;
    }
    .hero-description {
        font-size: 1.2rem;
    }
}

@media (max-width: 768px) {
    .navbar .container {
        flex-direction: column;
        gap: 15px;
    }
    .navbar ul {
        flex-wrap: wrap;
        justify-content: center;
    }
    .navbar .nav-item {
        min-width: unset; /* Küçük ekranlarda sabit genişliği kaldır */
        flex-grow: 1; /* Esnek genişlik ver */
    }
    .hero-title {
        font-size: 3.5rem;
    }
    .hero-subtitle {
        font-size: 2rem;
    }
    .hero-description {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .navbar .logo {
        font-size: 1.5rem;
    }
    .navbar .nav-item {
        padding: 8px 12px;
        font-size: 0.9rem;
    }
    .hero-title {
        font-size: 2.5rem;
        letter-spacing: 1px;
    }
    .hero-subtitle {
        font-size: 1.5rem;
    }
}