body {
    margin: 0;
    padding: 0;
    min-height: 100vh;
    background: 
        linear-gradient(rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0.95)),
        url('images/background.png') no-repeat center center / cover fixed;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(2px);
}

.container {
    background: rgba(32, 32, 32, 0.85);
    padding: 2rem 3rem;
    border-radius: 16px;
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.18);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.btn {
    display: block;
    width: 280px;
    padding: 18px 24px;
    margin: 16px auto;
    border-radius: 12px;
    text-decoration: none;
    font-size: 1.1em;
    font-weight: 500;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background: rgba(255, 255, 255, 0.05);
    color: rgba(255, 255, 255, 0.9);
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.08),
        transparent
    );
    transition: 0.5s;
}

.btn:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12);
}

.btn:hover::before {
    left: 100%;
}

.btn:active {
    transform: translateY(0);
    background: rgba(255, 255, 255, 0.03);
}

/* Цветовые акценты */
.affine {
    border-left: 4px solid #FF6B6B;
}

.tasks {
    border-left: 4px solid #4ECDC4;
}

.files {
    border-left: 4px solid #96C93D;
}

/* Анимация появления */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.container {
    animation: fadeIn 0.6s ease-out;
}