/* Navigation */
.navbar {
    background: rgba(30, 33, 41, 0.85);
    box-shadow: 0 0 20px #4f88ffcc;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 10;
    transition: all 0.3s ease;
}
.navbar.scrolled {
    background: rgba(30, 33, 41, 0.95);
    box-shadow: 0 0 25px rgba(79, 136, 255, 0.5);
}
.navbar-brand {
    font-size: 1.8rem;
    color: #4f88ff;
    font-weight: 700;
    user-select: none;
}
.nav-link {
    color: #a0c1ff;
    margin-left: 1rem;
    transition: color 0.3s ease;
    user-select: none;
}
.nav-link:hover,
.nav-link.active {
    color: #2171ff;
}
.btn-login-small {
    background-color: #4f88ff !important;
    color: white !important;
    padding: 0.3rem 1rem;
    border-radius: 2rem;
    font-weight: 600;
}
.btn-login-small:hover {
    background-color: #2171ff !important;
}

/* Header / Hero */
.header-container {
    min-height: 85vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 0 1rem;
    text-align: center;
    position: relative;
    z-index: 1;
}
.app-title {
    font-size: clamp(3rem, 8vw, 7rem);
    font-weight: 900;
    color: #ffffff;
    margin-bottom: 1rem;
    user-select: none;
    animation: slideUpFade 1.5s ease-out, glowPulse 5s ease-in-out infinite;
}
.header-subtitle {
    font-size: 1.6rem;
    margin-bottom: 2.5rem;
    max-width: 650px;
    line-height: 1.4;
    color: #e4e6ebcc;
}

/* Primärer Button */
.btn-login {
    background: linear-gradient(90deg, #4f88ff, #2171ff);
    border: none;
    padding: 1rem 3rem;
    font-weight: 600;
    border-radius: 3rem;
    color: #fff;
    cursor: pointer;
    transition: background 0.3s ease, box-shadow 0.3s ease;
    font-size: 1.2rem;
    user-select: none;
    display: inline-block;
    max-width: 320px;
    width: auto;
    text-align: center;
    box-shadow: 0 0 20px rgba(79, 136, 255, 0.5);
}
.btn-login:hover {
    background: linear-gradient(90deg, #2171ff, #4f88ff);
    box-shadow: 0 0 25px #4f88ffcc;
}

/* Animationen */
@keyframes glowPulse {
    0%, 100% { text-shadow: 0 0 5px #4f88ff; }
    50% { text-shadow: 0 0 20px #4f88ff; }
}
@keyframes slideUpFade {
    0% { opacity: 0; transform: translateY(40px); }
    100% { opacity: 1; transform: translateY(0); }
}