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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #000000;
    color: #f5f5f7;
    display: flex;
}

/* YAN MENÜ (SIDEBAR) */
.sidebar {
    width: 260px;
    height: 100vh;
    background-color: #111111;
    padding: 40px 20px;
    position: fixed;
    border-right: 1px solid #333;
    z-index: 100;
}

.sidebar .logo { font-size: 24px; font-weight: 700; margin-bottom: 50px; color: #fff; letter-spacing: -1px; }
.sidebar nav ul { list-style: none; }
.sidebar nav ul li { margin-bottom: 5px; position: relative; }
.sidebar nav ul li a { text-decoration: none; color: #86868b; font-size: 17px; padding: 12px 15px; display: block; border-radius: 10px; transition: 0.3s; }
.sidebar nav ul li a:hover, .sidebar nav ul li a.active { background-color: #1c1c1e; color: #ffffff; }

/* SUBMENU */
.submenu { display: none; list-style: none; padding-left: 15px; margin-top: 5px; }
.submenu li a { font-size: 14px !important; padding: 8px 15px !important; }
.has-submenu:hover .submenu { display: block; animation: fadeIn 0.3s ease; }

@keyframes fadeIn { from { opacity: 0; transform: translateY(-5px); } to { opacity: 1; transform: translateY(0); } }

/* ANA İÇERİK */
.content { margin-left: 260px; width: 100%; padding: 80px 10%; }
.hero { margin-bottom: 80px; }
.hero h1 { font-size: 56px; margin-bottom: 20px; background: linear-gradient(180deg, #fff 0%, #a1a1a6 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hero p { font-size: 20px; color: #86868b; max-width: 700px; }

/* VIDEO GRID (MÜZİK SAYFASI İÇİN ÖZEL) */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); /* Esnek yan yana dizilim */
    gap: 30px;
}

.video-card {
    background-color: #161617;
    border-radius: 18px;
    padding: 20px;
    transition: transform 0.3s ease, background-color 0.3s ease;
    border: 1px solid #222;
}

.video-card:hover {
    transform: translateY(-10px); /* Üzerine gelince yukarı kaysın */
    background-color: #1c1c1e;
}

.video-container {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 Oranı */
    height: 0;
    margin-bottom: 20px;
    border-radius: 12px;
    overflow: hidden;
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.video-card h3 { font-size: 20px; margin-bottom: 10px; color: #fff; }
.video-card p { font-size: 15px; color: #86868b; line-height: 1.4; }

footer { margin-top: 100px; padding: 40px 0; border-top: 1px solid #333; font-size: 14px; color: #424245; }