* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    user-select: none;
}

/* Arka Planlar */
.login-bg {
    background: linear-gradient(135deg, #1f4068, #162447);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    color: white;
}

.desktop-bg {
    background: url('https://images.unsplash.com/photo-1618005182384-a83a8bd57fbe?q=80&w=1920') no-repeat center center fixed;
    background-size: cover;
    height: 100vh;
    overflow: hidden;
}

/* Kilit Ekranı Tasarımı */
.login-container {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 40px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    width: 320px;
}

.avatar {
    width: 80px;
    height: 80px;
    background: #e4e4e4;
    border-radius: 50%;
    margin: 0 auto 20px;
    background-image: url('https://cdn-icons-png.flaticon.com/512/3135/3135715.png');
    background-size: cover;
}

.login-container input {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: none;
    border-radius: 5px;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    outline: none;
}

.login-container input::placeholder {
    color: #ddd;
}

.login-container button {
    width: 100%;
    padding: 10px;
    border: none;
    background: #0078d4;
    color: white;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
}

.login-container button:hover {
    background: #005a9e;
}

.error-msg {
    color: #ff6b6b;
    font-size: 14px;
    margin-bottom: 10px;
}

/* Masaüstü Simgeleri */
.desktop-icons {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    width: 120px;
}

.icon {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    cursor: pointer;
    color: white;
    text-shadow: 1px 1px 3px black;
    padding: 10px;
    border-radius: 5px;
}

.icon:hover {
    background: rgba(255, 255, 255, 0.15);
}

.icon img {
    width: 45px;
    height: 45px;
    margin-bottom: 5px;
}

.icon span {
    font-size: 13px;
}

/* Pencereler (Windows) */
.window {
    position: absolute;
    top: 15%;
    left: 30%;
    width: 450px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    display: none;
    flex-direction: column;
    overflow: hidden;
    z-index: 10;
    border: 1px solid #ccc;
}

.window-header {
    background: #f3f3f3;
    padding: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
    font-weight: 500;
    border-bottom: 1px solid #ddd;
    cursor: move;
}

.close-btn {
    background: transparent;
    border: none;
    font-size: 18px;
    cursor: pointer;
    padding: 0 5px;
}

.close-btn:hover {
    color: red;
}

.window-body {
    padding: 20px;
    color: #333;
    font-size: 14px;
    line-height: 1.5;
    max-height: 300px;
    overflow-y: auto;
}

/* Görev Çubuğu */
.taskbar {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 48px;
    background: rgba(16, 16, 16, 0.75);
    backdrop-filter: blur(12px);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 10px;
    z-index: 100;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.start-btn {
    background: transparent;
    border: none;
    color: white;
    padding: 0 15px;
    height: 100%;
    cursor: pointer;
    font-size: 14px;
}

.start-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.taskbar-time {
    color: white;
    font-size: 11px;
    text-align: right;
    padding-right: 10px;
}

/* Başlat Menüsü */
.start-menu {
    position: fixed;
    bottom: 53px;
    left: 10px;
    width: 300px;
    background: rgba(25, 25, 25, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.5);
    display: none;
    grid-template-columns: 80px 1fr;
    overflow: hidden;
    z-index: 99;
    border: 1px solid rgba(255,255,255,0.1);
}

.start-menu-sidebar {
    background: rgba(255, 255, 255, 0.05);
    display: flex;
    align-items: flex-end;
    padding: 15px;
    color: white;
    font-size: 12px;
}

.start-menu-links {
    padding: 15px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.start-menu-links a {
    color: #ccc;
    text-decoration: none;
    font-size: 14px;
    padding: 5px;
    border-radius: 4px;
}

.start-menu-links a:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

.shutdown-btn {
    color: #ff6b6b !important;
}